How Furanic Resins Are Revolutionizing Concrete: Chemical Resistance and Durability in the Construction of the FutureFrom Agricultural Chemistry to Construction Site Innovation: How Furan Resins Reinforce Concrete and Mortars for Greater Structural Resistanceby Marco ArezioIn an increasingly demanding construction landscape—where buildings must endure extreme environmental conditions, chemical contamination, and sustainability challenges—the adoption of innovative materials has become essential. Among the most promising solutions, furan resins are emerging as key players in the world of concrete and specialized mortars, offering properties that go well beyond those of traditional cementitious binders.These resins, rooted in organic chemistry of agricultural origin, are not new to the industrial sector, where they’ve long been valued for their chemical resistance. But it’s in the building sector that their full potential is now being realized, especially in situations where ordinary concrete simply isn’t enough.A Chemical Overview: What Are Furan Resins?To fully understand the technical value of furan resins, we need to take a step back and look at their molecular structure. Furan resins are primarily derived from a compound called furfural, which is obtained through hydrolysis and subsequent distillation of lignocellulosic biomass (such as corn cobs, bran, or oat husks)—in other words, from agricultural waste rich in pentosans.Chemically speaking, the molecules forming these resins are aromatic five-membered rings containing one oxygen atom, known as the furan ring. This ring is stable, rigid, and highly resistant to chemical attack. When furfural undergoes polymerization—either through strong acids or heat—it creates a three-dimensional cross-linked structure, forming a durable, thermally stable, and chemically inert polymer network.Polymerization can be self-initiated (via heat) or catalyzed using acids or metal salts, depending on the intended application. The resulting material has the following key characteristics:- High resistance to solvents, acids, and alkalis- Thermal stability up to 150–180 °C in continuous service (even higher for short durations)- Low permeability to liquids and gases- Thermoplastic behavior during initial processing and thermosetting behavior after curingThis unique configuration makes furan resins among the most stable thermosetting materials available on the market, and ideal candidates for use in chemically hostile environments or where mechanical stress is significant.A Chemical Bond That Changes the GameIncorporating furan resins into concrete transforms the material's microstructure. These aren’t mere additives; they function as secondary binders, dispersing throughout the cement matrix and significantly altering its properties. The result? A concrete mix that’s far more resistant to chemical attack, moisture infiltration, and physical degradation over time.Specifically, their molecular structure blocks the ingress of aggressive agents such as acids, bases, salts, and organic solvents. This leads to a drastic reduction in porosity and, consequently, permeability—greatly enhancing the protection of embedded steel reinforcements, which are especially vulnerable to corrosion in industrial or marine environments.More Durable, More Stable, Less FragileUnlike traditional concrete, which can crack prematurely, carbonate, or deteriorate under freeze-thaw cycles, furan resin-enhanced concrete offers superior durability. Its mechanical performance is significantly enhanced: it resists compression, bending, and dynamic loads far more effectively. Even in damp or chemically aggressive environments—such as wastewater treatment plants or chemical industries—this concrete retains its structural integrity for decades.Thermal stability is another notable advantage: furan resins degrade very slowly at high temperatures, allowing concrete to be used in structurally demanding environments such as power plants or industrial facilities operating under constant heat.The Mix: A Balance of Chemistry and EngineeringCreating concrete with furan resins requires specialized knowledge and precise formulation. The mix must be finely calibrated: the resin dosage, water-to-cement ratio, aggregate selection, and use of any plasticizers or accelerators all influence the final performance.Resins are usually added in the liquid phase using dedicated blending systems to ensure homogeneous distribution. The mix may be denser and more viscous than conventional concrete, but workability can be optimized with the right admixtures. The setting time is relatively fast—a clear advantage for fast-paced construction—but it demands tight coordination during placement.Placement and Best Practices on SitePlacing furan-based concrete requires close attention, particularly to ensure proper compaction and even distribution. Working conditions must be carefully managed: low temperatures slow down curing, while excessively high temperatures can cause premature setting. Proper curing is essential—contractors often use covers or misting systems to prevent water loss and ensure uniform hardening.The most visible benefit appears over time: treated surfaces show no cracking, resist external aggression, and maintain their properties even after years of use.Real-World Applications and Future OutlookFuran resin concrete is being increasingly used in demanding environments, including:- Chemical and petrochemical plants, where surfaces are in constant contact with corrosive substances- Tunnels and underground structures, which require robust protection from moisture and aggressive gases- Port infrastructures, such as piers and docks, exposed to salt and constant humidity- Sewage and water treatment facilities, where materials endure continuous biological and chemical attackBut the future of furan resins extends beyond these use cases. With the rise of circular and sustainable construction, these bio-based resins are poised to become core components of next-generation building materials—meeting both performance demands and environmental goals.A Silent but Powerful TechnologyIn conclusion, furan resins represent a quiet yet transformative innovation for enhancing concrete in the most challenging conditions. They offer invisible but powerful protection, increase structural longevity and safety, and open up new opportunities for technical and industrial construction. Investing in knowledge and application of these materials means building not just smarter—but with a vision firmly set on the future.© Reproduction Prohibited
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Biocidal Additives in the Production of Recycled PaperComponent Analysis, Functioning, Advantages, Disadvantages, and Environmental Impactsby Marco Arezio In today's industrial landscape, recycled paper represents a critically important sustainable solution to reduce the environmental impact of paper production. However, recycled paper presents unique challenges that require specific solutions to ensure a high-quality product. Among these solutions, biocide additives play a crucial role. These chemical compounds are used to prevent the growth of microorganisms that could deteriorate the paper and compromise its hygienic safety. This article explores the composition, mechanism of action, reasons for use, quantities employed, advantages, disadvantages, and environmental impact of biocide additives in recycled paper production. Composition of Biocide Additives Biocide additives are a heterogeneous class of chemical compounds designed to eliminate or inhibit the growth of bacteria, fungi, and algae that can proliferate in recycled paper. Biocides can be divided into two main categories: organic and inorganic. Among the organic compounds, we find isothiazolinones, phenols, and organosulfur compounds, known for their antimicrobial efficacy even at low concentrations. Isothiazolinones, for example, are preferred for their broad spectrum of antimicrobial activity and chemical stability. Inorganic compounds include metal salts such as silver and copper, which possess potent antimicrobial properties. Additionally, with increasing environmental sensitivity, natural biocides, such as plant extracts with antimicrobial properties, are being developed as a more ecological alternative. Mechanism of Action of Biocide Additives The functioning of biocide additives is based on several mechanisms. Some biocides act by inhibiting the synthesis of proteins essential for the survival of microorganisms. Others damage cell membranes, causing cell lysis and the consequent death of microorganisms. Still others interfere with cellular respiration, preventing the production of energy necessary for cell life. These mechanisms of action make biocides extremely effective in controlling microbial proliferation.Reasons for Using Biocide Additives The use of biocide additives in recycled paper production is driven by several needs. First, recycled paper is particularly vulnerable to microbial growth due to the organic residues that may be present in recycled materials. Without the use of biocides, these microorganisms can cause the deterioration of the paper, compromising its quality. Secondly, the use of biocides ensures that recycled paper is hygienically safe for use. This is particularly important for applications requiring high hygienic standards, such as food packaging. Finally, biocides help to extend the lifespan of recycled paper, preserving its physical and mechanical properties.Quantities of Biocide Additives Used The amount of biocides used in recycled paper production varies based on several factors, including the type of biocide used and the specific needs of the final product. In general, biocide concentrations range from 0.01% to 1% of the total paper weight. The goal is always to use the minimum effective amount to minimize environmental impact.Advantages of Biocide Additives The use of biocide additives in recycled paper production offers numerous advantages. Firstly, they provide effective antimicrobial protection, preventing the growth of bacteria, fungi, and algae. This not only improves the quality of the paper but also prolongs its lifespan. Additionally, the use of biocides ensures that recycled paper meets the hygienic standards required for many applications, enhancing the safety of the final product.Disadvantages of Biocide Additives However, the use of biocide additives is not without disadvantages. Biocide additives can have a significant environmental impact if not managed correctly. Biocide residues can contaminate water sources, damaging aquatic ecosystems and reducing biodiversity. Additionally, some biocides can be toxic to humans, requiring strict safety measures for workers involved in paper production. Finally, the continuous use of biocides can lead to the development of microbial resistance, reducing the effectiveness of the additives over time.Environmental Impact The use of biocide additives in recycled paper production has several environmental implications. Biocide residues can end up in watercourses, accumulating in aquatic ecosystems and negatively affecting flora and fauna. Some biocides are difficult to degrade and can persist in the environment for long periods, increasing the risk of contamination. Additionally, exposure to biocides can reduce biodiversity, affecting non-target organisms such as beneficial algae and bacteria. Another issue is the production of toxic by-products. Some biocides can degrade into even more toxic secondary compounds, increasing the risk to the environment. To mitigate these impacts, the paper industry is working to develop safer and more effective biocides with a lower environmental impact.Conclusions Biocide additives are essential to ensure the quality and safety of recycled paper. However, their use must be balanced with careful consideration of environmental impacts and potential health risks. The paper industry is making significant progress in developing safer and more eco-friendly biocides, increasingly using natural biocides. The adoption of sustainable practices and the use of ecological biocides represent important steps towards a more responsible and eco-friendly production of recycled paper.
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Thermal and acoustic insulation with recycled paper: a sustainable choice for modern constructionDiscover How Recycled Paper is Revolutionizing Thermal and Acoustic Insulation: An Ecological, Economical, and Innovative Solution for Sustainable ConstructionBy Marco ArezioThermal and acoustic insulation is a cornerstone of modern building design, essential for enhancing living comfort and reducing energy consumption. Among the most innovative and sustainable solutions is the use of recycled paper—a versatile and eco-friendly material that is transforming the construction industry. This article delves into the technical features, benefits, and applications of recycled paper for insulation, highlighting its environmental, economic, and performance advantages.The growing focus on sustainable construction practices has led many companies to explore alternatives to traditional insulating materials. Recycled paper not only meets these needs but also offers excellent thermal and acoustic performance. Its adaptability to various building contexts, combined with its low environmental impact, makes it an ideal choice for residential, commercial, and industrial projects.Technical Properties and Advantages of Recycled PaperRecycled paper used as insulation is derived from recovered newspapers and cardboard, processed into cellulose flakes through specific treatments. This material stands out for several properties that make it competitive compared to conventional insulation materials.Thermal InsulationThanks to its fibrous structure, recycled paper traps air, creating a natural barrier against heat loss. With thermal conductivity values (λ) ranging between 0.037 and 0.040 W/mK, it offers comparable performance to:Glass wool: λ between 0.032 and 0.040 W/mK.Expanded polystyrene (EPS): λ between 0.030 and 0.040 W/mK.This ability to reduce heat loss ensures stable indoor temperatures, improving the overall energy efficiency of buildings. Additionally, recycled paper contributes to maintaining a healthy indoor climate by absorbing and releasing moisture without compromising its insulating properties. This makes it particularly suitable for environments with high humidity or subject to climatic variations.Its capacity to regulate indoor humidity helps prevent mold and condensation, increasing the longevity of building structures. This feature is especially beneficial in areas with variable climates.Acoustic InsulationFrom an acoustic standpoint, recycled paper excels due to its density and porous structure, which effectively absorbs noise. With a sound reduction index (Rw) similar to materials like rock wool and expanded polyurethane, it is an ideal solution to:- Reduce noise pollution in buildings located in densely populated urban areas.- Improve sound insulation between internal spaces, such as offices and homes.Recycled paper is particularly effective in absorbing low and mid-frequency sounds, making it an optimal choice for theaters, auditoriums, and shared workspaces. Its use can significantly enhance acoustic comfort, creating more pleasant and productive environments.Environmental SustainabilityRecycled paper helps reduce paper waste and curbs the use of non-renewable materials. Additionally, its production process requires less energy than traditional insulation materials, cutting CO2 emissions and supporting a circular economy.Another advantage is the ability to reuse recycled paper at the end of a building's lifecycle, reducing demolition waste. This approach closes the production loop and aligns perfectly with principles of environmental sustainability.Safety and HealthThe material is treated with natural additives to make it resistant to fire and insects, without the use of harmful chemicals. This feature makes it a safe and healthy choice for homes and workplaces. Moreover, its natural composition minimizes the risk of emitting volatile organic compounds (VOCs), ensuring healthier indoor air quality.Comparison with Other Insulation MaterialsHere’s how recycled paper compares to other commonly used insulation materials:Glass Wool: Offers similar performance but requires more energy for production and generates complex waste for disposal.Expanded Polystyrene (EPS): Excellent thermal performance but less effective in acoustic insulation, with a high environmental impact due to its petrochemical origins.Rock Wool: Balances thermal and acoustic insulation well but is more challenging to install due to its weight.Expanded Polyurethane: Superior thermal performance (λ < 0.030 W/mK) but more expensive and with lower acoustic properties than cellulose.Unlike many synthetic insulation materials, recycled paper doesn’t rely on the extraction of non-renewable resources, making it an ethical and responsible choice for the construction industry.Applications of Recycled PaperRecycled paper is an extremely versatile material, suitable for numerous applications in construction, both in new buildings and renovations:- Interior and Exterior Walls: Blown into cavities, it improves the thermal and acoustic performance of partition walls.- Attics and Lofts: Ideal for reducing heat loss, maintaining stable temperatures in both summer and winter.- Floors: Reduces impact noise and enhances thermal comfort in buildings with cavities.- Roofs and Ceilings: Protects against temperature fluctuations and reduces noise pollution in adjacent areas.Thanks to its flexibility, recycled paper can also be used in historic buildings, where installing modern materials might be invasive.Why Choose Recycled PaperEnergy EfficiencyInsulation with recycled paper significantly reduces energy consumption for heating and cooling, leading to substantial cost savings and lower CO2 emissions.Low Environmental ImpactChoosing recycled paper means adopting a responsible approach to the environment, promoting material reuse, and minimizing waste.Circular EconomyThe use of recycled paper aligns perfectly with circular economy principles, encouraging resource valorization and reducing dependence on virgin raw materials.Versatility and PracticalityRecycled paper is easy to install and adapts to various construction needs, making site work faster and less costly. Its compatibility with different types of buildings makes it suitable for both residential and commercial projects.ConclusionThermal and acoustic insulation with recycled paper is a sustainable, innovative, and highly effective choice. Thanks to its excellent technical properties, low environmental impact, and ease of application, this material is a valid alternative to traditional products. Adopting it not only improves building efficiency but also actively contributes to protecting the planet, promoting a more sustainable and responsible future.Investing in recycled paper means looking beyond conventional solutions, embracing a technology that combines tradition and innovation. This seemingly simple material demonstrates that even waste can transform into a valuable resource for our future.© Reproduction Prohibited
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Machine Learning for Paper Grammage Prediction: Algorithms and Sensors in Modern Paper MillsHow Artificial Intelligence and Sensor-Based Measurements Are Revolutionising Quality Control and Production Efficiency in the Paper Industryby Luca OrizioThe paper industry—although one of the oldest branches of manufacturing—is undergoing a period of profound technological innovation. The convergence of process digitalisation, advanced sensing, and artificial intelligence (AI) is radically transforming the way production is managed, with a direct impact on both product quality and operational efficiency.The Critical Role of Grammage in PapermakingOne of the most delicate and decisive aspects of papermaking is the control of grammage—the basis weight of paper expressed in grams per square metre (g / m²). This parameter has a direct effect on the functionality of the finished product, whether printing paper, packaging, or tissue. Traditionally, grammage verification has relied on manual sampling followed by laboratory analysis. Today, thanks to the integration of sensors and machine-learning algorithms, this value can be predicted and controlled in real time with a level of accuracy and speed unimaginable just a few years ago.In a sector that runs at break-neck speed and faces ever-thinner margins, grammage stability is synonymous with efficiency and competitiveness. Any deviation from the optimal value can trigger a cascade of problems—from non-compliance with customer specifications to material and energy waste—with inevitable environmental repercussions.Take a packaging line, for example. Excessive grammage leads to over-consumption of pulp and chemical additives, as well as heavier transport weights. Conversely, insufficient grammage may not provide the required mechanical strength, causing the customer to reject the batch. Even tiny variations can affect cost, logistics, and sustainability.For these reasons, the paper supply chain has devoted the past decades to enhancing quality control, aiming at standardisation that minimises variability and maximises performance.From Manual Sampling to Smart SensingThe traditional method for determining grammage involved collecting paper samples at set intervals and analysing them with precision scales and laboratory instruments to calculate basis weight from sheet mass and area. Accurate, yes—yet disconnected from the real-time production flow.High-resolution industrial sensors now make it possible to monitor variables such as paper thickness, residual moisture, surface density, and even beta- or gamma-ray absorption, all indirectly correlated with grammage. Mounted along the production line, these devices gather continuous data, providing a dynamic picture of the entire process.But gathering data is not enough. To make sense of such information streams, something more is required: algorithms capable of learning, adapting, and predicting. This is precisely where machine learning (ML) comes into play.Machine Learning at the Service of Paper MillsMachine learning—a subset of AI—rests on the idea that a system can learn from observed data, recognise hidden patterns, and generate forecasts. In papermaking, that means building a model able to estimate grammage directly from sensor readings, without waiting for lab results.The workflow unfolds over several stages:Data acquisition – Capture large volumes of data: thickness, temperature, humidity, stock pressure, web speed, chemical composition, and more. Align these with actual grammage values obtained from reference measurements.Pre-processing – Clean and prepare the data: remove anomalies, harmonise units, and synchronise datasets.Feature engineering – Identify the most influential variables.Model building – Choose and train a predictive model (linear regression, neural network, random forest, etc.), then validate it.Deployment – Implement the model in the production chain to deliver real-time estimates and instantly adjust processing parameters.Algorithms in Action: Selecting the Right ModelChoosing the appropriate algorithm is never trivial. It depends on the process type, data volume, operational variability, and in-house expertise.Algorithm Best suited for Notes- Multiple linear regression Simple contexts with few, well-defined relationships Easy to interpret- Decision trees / Random Forests Scenarios with many interacting variables, even non-linear Robust and versatile- Artificial neural networks Complex pattern recognition Require large datasets and significant computing power- Support Vector Machines (SVM) Noisy environments or highly correlated variables Effective at handling outliersWhatever the choice, continuous monitoring, updating, and retuning are essential—especially when materials, equipment, or product requirements change.Why Machine Learning Is a Game-ChangerIntroducing ML into a paper mill is more than a technical upgrade; it is a paradigm shift. Key benefits include:- Continuous monitoring – Grammage is estimated instant by instant, shortening reaction times.- Scrap reduction – Corrections are applied immediately, before the product becomes unusable.- Material & energy savings – Precise dosing of raw materials directly boosts sustainability.- Traceability & certified quality – Every decision is documented, every datum preserved, simplifying audits and regulatory compliance.- Customer loyalty – Consistent product quality enhances brand reputation and cuts complaint rates.Challenges Beyond TechnologyNaturally, adopting ML is not without hurdles. The main difficulties concern:- Data reliability – Poorly calibrated sensors or corrupted data can undermine the entire process.- Specialist skills – Professionals must combine papermaking expertise with data-science abilities.- IT/OT integration – Communication between corporate IT systems and shop-floor machinery must be stable, secure, and flexible.- Model maintenance – Algorithms need periodic retraining to reflect evolving conditions.- Corporate culture – Personnel must be engaged in the transition, overcoming scepticism toward automated decision-making.Real-World Cases: Experiences and OutcomesNumerous mills across Europe and beyond are already applying AI to grammage control with notable success. In Scandinavia, one of the largest coated-paper producers implemented a neural-network predictor that cut grammage fluctuations by 40 % and saved several thousand euros per month in energy costs.In Italy, packaging-focused mills use regression and ML models to tailor grammage to each packaging grade and brand requirement. Meanwhile, some industrial-solution providers now offer turnkey packages that bundle sensors, cloud dashboards, intuitive GUIs, and predictive-maintenance tools—paving the way to digitalisation even for SMEs.Looking Ahead: The Smart Paper FactoryWhat today appears as an advanced application will soon become the norm. The next step is embedding ML within a full smart-factory logic: interconnected plants, real-time data processing at the edge, self-adapting algorithms, and systems that learn from their own mistakes.The ambition is not merely to boost productivity but to transform the very way paper is conceived, produced, and traced. Grammage prediction becomes just one of many tiles in an intelligent, sustainable, highly competitive production mosaic.ConclusionMachine learning applied to grammage prediction is no passing trend; it is a strategic lever for transforming the paper sector. Through the synergy of sensor data and predictive models, mills achieve fine-grained process control, cutting scrap, costs, and environmental impact.Despite its challenges, this technology heralds the dawn of a new era—one of autonomous manufacturing in which human expertise and AI power collaborate to produce more, with less. Those who seize this opportunity will be well-prepared to meet the challenges of Industry 5.0.© All rights reserved
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“Smart” Concrete: A Sustainable Revolution in Modern ConstructionDiscover How Six Innovations in Concrete Are Transforming Construction, Enhancing Performance, and Reducing Environmental Impactby Marco ArezioConstruction, one of the oldest and most fundamental sectors of our society, is undergoing an epochal transformation. The growing environmental awareness, combined with the pressing need to address climate change and improve urban quality of life, is pushing the sector towards more innovative and sustainable solutions.In this scenario, concrete, a cornerstone material of construction, is evolving to become "smart."But what does "smart concrete" really mean? It refers to a material that integrates advanced technologies to improve its performance, durability, and environmental impact, addressing the needs of our time with intelligence and versatility.The adoption of smart concretes represents a concrete response to many of the challenges our cities face today: from air pollution to water resource management, from the need for resilient infrastructures to healthier and safer buildings.Below, we will explore seven types of smart concrete that are revolutionizing the construction sector, each with specific characteristics that enhance its use and maximize its effectiveness.PhotoluminescentImagine a road that absorbs sunlight during the day and glows at night without the need for electric power. This is photoluminescent concrete.In the 1990s, photoluminescent pigments were initially developed for military and security purposes. Now, they are used to illuminate pedestrian paths, bike lanes, and roads.The composition of photoluminescent concrete involves incorporating special pigments, such as strontium aluminates, which absorb sunlight during the day and release it slowly at night.This feature not only improves safety but also helps reduce energy consumption.Smog-Eating (Photocatalytic)Next, we have smog-eating concrete, a true innovation for air quality. In the 1970s, scientists discovered the potential of titanium dioxide (TiO2) as a photocatalytic agent.This material, when exposed to sunlight, triggers a chemical reaction that breaks down atmospheric pollutants like nitrogen oxides (NOx) and volatile organic compounds (VOCs).Imagine a city where sidewalks and building facades help purify the air we breathe.Photocatalytic concrete contains titanium dioxide, which, activated by sunlight, decomposes pollutants into less harmful substances like nitrates and carbon dioxide.Self-HealingNow think of concrete that repairs itself. In the 1990s, the concept of self-healing materials emerged, later applied to concrete in the 2000s.This type of concrete contains chemical agents such as bacteria or microcapsules of cementitious material that activate upon contact with water.When water penetrates cracks, these agents release lime that seals the fissures, preventing further damage and reducing maintenance costs. This innovation not only extends the life of structures but also offers a sustainable solution for infrastructure maintenance.PermeablePermeable concrete is another fascinating innovation. Developed in the 1960s to address urban flooding issues, this material is highly permeable, allowing rainwater to pass through it and reach the underlying ground.Composed mainly of coarse aggregates and a minimal amount of cement, permeable concrete prevents surface water accumulation, improving stormwater management. It is ideal for parking lots, sidewalks, and roads in urban areas, where water management is a crucial challenge.LivingA revolutionary idea in the world of concrete is living concrete, which emerged in the 2000s. Imagine a material that can interact with its surrounding environment.By mixing photosynthetic materials with sand or hydrogel, living concrete can self-regulate in response to environmental conditions, helping to maintain an optimal internal temperature and improving the energy efficiency of buildings.Moreover, photosynthetic materials can produce oxygen and absorb carbon dioxide, contributing to better air quality.SpaceFinally, consider space concrete, developed in the 2000s to withstand the extreme conditions of space.This material is formulated with lunar or Martian regolith combined with high-strength binders, designed to endure extreme temperatures and space radiation.It is perfect for building infrastructure on the Moon or Mars. Research on these materials also has significant implications on Earth, leading to the development of more resistant and durable concretes capable of withstanding severe environmental conditions.ConclusionSmart concretes represent the future of sustainable construction. By integrating innovative technologies, these materials not only enhance structural performance but also contribute to environmental protection and improved quality of life.Continuing to invest in research and development in this field is crucial for addressing global challenges, providing efficient, durable, and sustainable construction solutions. These innovations not only mark a step forward in material science but also respond to the growing demand for construction solutions that are efficient, durable, and environmentally friendly.
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Large Diameter Corrugated Pipes for Sewerage in HDPE and PPLarge Diameter HDPE and PP Corrugated Sewer Pipes through the use of recycled granules The sewer lines are designed according to the workload that the inhabited centers impose on the drainage system and, on the basis of other technical-design parameters, the characteristics of the waste liquid transport pipes are established. Non-pressure pipes made of plastic material , especially those made of high-density polyethylene and polypropylene, have been widely used for decades following the advantages that are inherent in the raw materials constituting the pipes themselves. Granules can be used in Recycled or virgin HDPE that has an MFI 0.4-0.7 at 190°/5 Kg., or in PP with MFI 1.5-2 at 230°/2.16 Kg. with correct thermal stability and the right quantity of carbon black. The characteristics normally required in the design phase are: • Resistance to external loads • Resistance to chemical and electrochemical aggression • Bidirectional sealing of the joints • Hydraulic characteristics constant over time • Reduced adhesion to encrustations • Easy assembly and installation • Reduced installation and maintenance costs HDPE and PP pipes can be corrugated , i.e. have a reinforcing corrugation on the external part of the structure and a smooth finish on the internal part. In the presence of large pipes it is possible to place a metal structure in the intrados of the corrugation with the aim of increasing the resistance of the product to the phenomenon called "creep" , which takes the form of a visco-elastic behavior of the material, with the consequent deformability temporary tube. We mentioned the presence of the two layers of the tube, the corrugated external one and the smooth internal one, elements which therefore have two very distinct functions. The smooth internal layer, in direct contact with the transported fluids, must have correct chemical and mechanical resistance towards the transported liquids and low sliding resistance. The external layer, corrugated , has the function of counteracting the compression forces acting on the laid pipe, guaranteeing its durability and the absence of breakages. In the case of reinforced pipes, a product developed in Japan in the 90s of the last century and subsequently widely used also in the United States, the characteristics of plastic materials such as resistance to abrasion, lightness, the minimum roughness coefficient, the inertness to chemical substances and ease of installation, to the characteristics of steel which has, for example, a much higher elastic modulus than polyethylene. The use of PP instead of HDPE occurs due to small differences in the materials: • Slightly higher elastic modulus • Better behavior at high temperatures (but less so at low temperatures) • Lower density and specific weight Among the three characteristics listed, the difference in the elastic modulus is certainly the most important one, as the modulus influences the rigidity of the tube and therefore the resistance to compressive loads. Therefore, for the same thicknesses, a higher elastic modulus corresponds to greater resistance to loads and, in the case of HDPE the instantaneous elastic modulus is normally > 800 MPa, while in PP it is > 1250 MPa. As we have said, the pipes made of HDPE and PP have excellent hydraulic characteristics both in terms of the roughness of the walls in contact with the fluids, but also in terms of resistance to abrasion, guaranteeing a constant hydraulic flow rate and great durability of the sewer line. Among the competitors of PP and HDPE pipes, such as cement, coated concrete, fiberglass, stoneware and PVC pipes , it has been verified, through laboratory tests, that the internal abrasion resistance is lower among the competitors therefore, these are subject to greater mechanical wear. Among these products, those composed of PVC have given results close to PP and HDPE pipes. To give us an idea of what is meant by large diameter sewer pipes, we can say that on the market there are pipes with an external diameter of up to 2500 mm. and internal of 2400 mm. about. When laying HDPE, PP and PVC pipes in trenches, the role of the substrate on which the line will be laid is fundamental , as these products are subject to visco-elastic mechanical behaviour, therefore subject to constant deformation over a defined time " creep”. In the case of substrates that are not extremely compact or subject to small movements, the use of corrugated pipes with metal armor in the intrados of the corrugation can help to contain this phenomenon. As regards the chemical characteristics of HDPE and PP pipes, we can say that the constituent materials have characteristics of resistance to electrochemical corrosion phenomena or to galvanic coupling, as they are not electrically conductive per se. Category: news - technical - plastic - recycling - pipes - sewerage - HDPE - PP
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What is an anechoic chamber and how is it built: technology, materials and sustainable innovationsA journey into the design of anechoic chambers, from purpose to acoustic and electromagnetic insulation techniques, with a focus on the use of recycled materials for a more sustainable futureby Marco ArezioAn anechoic chamber is a space designed to eliminate as much as possible the reflections of sound or electromagnetic waves, providing a controlled, "echo-free" environment.These chambers are widely used in acoustic research, in the design of electronic equipment, and to test the behavior of materials and products under acoustic isolation conditions.Let’s explore how an anechoic chamber is built, its purpose, the materials used, and whether recycled materials can be integrated into the construction process.Purpose of an anechoic chamberThe primary purpose of an anechoic chamber is to create an environment that minimizes or eliminates the reflection of sound or electromagnetic waves.This allows for precise measurements, unaffected by external interference or environmental reflections.In the field of acoustics, these chambers allow for the evaluation of audio equipment, speakers, and microphones in highly controlled conditions, enabling technicians to detect even the faintest sounds and monitor the interaction between sound and objects without the influence of echoes.In electromagnetism, these rooms are used to test electromagnetic emissions and interference from electronic devices, helping to understand how a device behaves in real environments and how to avoid contamination from unwanted signals.Anechoic chambers can be full or partial. A full anechoic chamber is capable of absorbing all sound or electromagnetic waves, creating an environment virtually free of noise.On the other hand, a semi-anechoic chamber allows for wave reflection from one or more surfaces (often the floor), which is useful for certain specific testing applications.Structure and design of an anechoic chamberBuilding an anechoic chamber requires a very specific design. The chambers are generally completely isolated from the external environment and coated with materials that absorb sound or electromagnetic waves.Isolation from the outside world: The first phase in constructing an anechoic chamber is to acoustically and electromagnetically isolate the space from the outside world.This means designing walls, ceilings, and floors that prevent external noise or electromagnetic interference from entering the room.The walls are often made of several layers of high-density materials, such as concrete or steel, combined with insulating materials like foam and mineral fibers.Absorption of sound or electromagnetic waves: The most distinctive feature of anechoic chambers is their ability to absorb sound or electromagnetic waves. This is achieved through the use of special coatings.For acoustic chambers, the walls are covered with high-density foam wedges arranged in a pyramid shape. These wedges gradually reduce the energy of sound waves, preventing their bounce and absorbing the sound.For electromagnetic chambers, special materials, such as shielding fabrics and conductive coatings, are used to absorb electromagnetic waves and prevent their reflection.Suspended and grated floors: A unique feature of anechoic chambers is the construction of "suspended" or grated floors, which allow sound or electromagnetic waves to pass through.In this way, the floor does not reflect the waves, allowing for greater precision in testing. This type of flooring can be made with metal grids or perforated rigid materials.Materials used for an anechoic chamberThe choice of materials is crucial in the construction of an anechoic chamber. In the case of an acoustic chamber, the most commonly used material for sound absorption is polyurethane foam. This foam is shaped into wedges or pyramids that progressively interrupt and absorb the sound.Other materials used include mineral fibers, polymer-based sound-absorbing materials, and fabric coverings. These materials are highly effective in ensuring near-total absorption of sound waves.For electromagnetic chambers, the main materials include metallic shields (such as copper or aluminum sheets) and conductive coatings that prevent wave reflection. In addition, composite materials with specific electromagnetic properties are used to absorb electromagnetic waves at specific frequencies.Use of recycled materialsIn recent years, there has been increasing exploration of the possibility of using recycled materials in the construction of anechoic chambers, especially in acoustic ones. Some of the most promising recycled materials include:Recycled foam: In some acoustic chambers, recycled foam from mattresses or other polyurethane products is being used. This foam, appropriately treated and shaped, can offer comparable performance to virgin foam, while reducing the environmental impact of construction.Recycled fibers: Recycled fibers, such as those derived from clothing or textile recycling, can be used as filling for sound-absorbing panels. These panels can be used for both acoustic insulation and electromagnetic shielding when combined with conductive materials.Composite materials: In the field of electromagnetic shielding, composite materials based on recycled plastic and metal powders are being tested. These materials, in addition to being more sustainable, can offer good performance in terms of absorption and shielding of electromagnetic waves.Recycled wood: Although less common in modern anechoic chambers, some structures might use recycled wood or reclaimed materials for the construction of certain components, especially in the initial isolation phases. However, it is necessary to ensure that the wood or derived materials do not compromise the absorption of sound or electromagnetic waves.Challenges in the use of recycled materialsIntegrating recycled materials into the construction of anechoic chambers presents some challenges. First, recycled materials must provide the same performance as virgin materials in terms of absorption and insulation, and this is not always easy to achieve.Furthermore, there is a need to maintain high standards of cleanliness and control, as even small irregularities can affect the results of tests conducted in the chamber.Additionally, not all recycled materials are suitable for long-term use in environments subject to continuous and prolonged use. Durability and wear resistance are key aspects, especially in anechoic chambers used for long-term industrial testing.ConclusionAnechoic chambers represent one of the most advanced technologies for measuring acoustic and electromagnetic phenomena.Their construction requires the use of specific materials for the absorption of sound or electromagnetic waves, and the possibility of using recycled materials is a promising path, though with some technical limitations.The integration of recycled materials, while offering advantages from an environmental sustainability standpoint, requires careful evaluation of performance and durability.However, with the advancement of recycling technologies and increasing attention to sustainability, it is likely that in the coming years we will see more and more anechoic chambers built with eco-friendly materials, without sacrificing the performance required for advanced testing.
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Recycled plastics for sanitary spaces.Recycled plastics for ventilated crawl spaces: which static and dynamic effects are transmitted on recycled plastic crawl spaces using different mixtures The ancient Romans had already understood, in the construction of buildings, the importance of creating a ventilated air space, between the ground and the floor, in order to avoid the capillary rising of humidity and allow a thermal insulation of the floor. The crawl space was built using walls connected to each other or with amphorae as a filling base. With the evolution of buildings, the ventilated crawl space has had multiple uses, not only to isolate from humidity, but it was possible to use, in the best way, the space created between the ground and the floor. Until a few years ago, before the advent of plastic in the building industry, the construction of crawl spaces was done through small tables, for horizontal parts, and bricks or concrete prisms for the vertical wall. However, this system did not fully guarantee isolation between one floor and another. Today, with the use of recycled plastic elements, the possibilities of using the interspace have been expanded and its technical qualities improved. Let’s see what are the possible uses of separating elements in recycled plastic: 1) The classic function for which he was born is to create, through continuous modular plastic elements, an effective separation between the inhabited plane and the foundation soil, preventing the capillary rising of humidity. Furthermore, the space that is created, allows the passage of the systems for the house functions easily. 2) The monolithic interspace formed, allows the evacuation of the Radon gas that forms in the ground. This is a colorless, odorless radioactive gas, formed by the decay of uranium 238, which has the ability to creep into the cracks of the ground and saturate the basements or floors in contact with it. Through the laying of the plastic elements on which a continuous concrete jet will be created, natural ventilation will be created, with air inlets to the north and exit to the south, so as to avoid gas stagnation. 3) The creation of ventilated roofs, especially for horizontal ones, allows a natural adjustment of the thermal changes that help, together with a correct insulation, the livability of the underlying environments and energy saving. 4) The plastic elements of reduced heights, especially those of 5 cm, help to correct sound insulation, together with damping mats, since the air stops inside the cells, helps the damping of sound waves. 5) Another function is to be able to create hanging gardens with the characteristic of being able to isolate the waterproofing layer from the roots of the plants. It is well known that most of the hanging garden defects concern the percolation of meteoric water, as the action of the roots opens gaps in waterproof bituminous membranes, with the possible passage of water. The plastic elements are extremely resistant to the drilling action of the plants. Surely there are many other functions that the plastic crawl space can perform but, listing the most common, I tried to give an idea of its use. Once you have decided what use must be made of the separator elements, it is important to understand how they are produced to be able to choose the elements that are suitable for our work. The main characteristics that are asked of a set of elements that will constitute the supporting structure for our concrete casting in the upper surface are: Element flexibility Vertical compression resistance Resistance to bending of domes Dimensional maintenance of the single pieces after molding in order to be assembled effortlessly by the operators and without leaving voids Lack of fragility during handling Correct thicknesses depending on the raw material used Non-deformability under the weight of fresh concrete Minimum walkability of the element expressed in the ability to support the floor jet worker, which must not be less than 150 kg calculated on a surface of cm.8 x cm.8. These characteristics, without prejudice to a correct design of the mold and the element itself, can be reached with a right choice of recycled raw materials, which can increase or decrease certain characteristics. The most commonly used material belongs to the polypropylene family, in particular a mixed compound between PP and PE which allows discrete mechanical performance and a low production cost. In some cases the HDPE element is produced, which gives the elements better technical performance in the face of higher production costs. The PP + PE recipe used has technical limitations to keep in mind: 1) The compound in PP + PE normally comes from the differentiated collection components , which consists of rigid polypropylene waste and low-density polyethylene flexible waste. The two elements are difficult to manipulate from the thermal point of view, during the molding phase, with the risk of degradation of the material and the formation of gas inside the molded element. These micro holes can weaken the element. 2) The compound obtained has, in general, good mechanical vertical characteristics , in particular as regards compression resistance, but, on the other hand, has a limited resistance to bending and torsion . The knowledge of the technical limits of this compound normally allows the resolution of these minus with an appropriate design of the reinforcing bands through the positioning of reticular septa, in the points most subject to possible breaks. 3) The search for exaggerated cost-effectiveness could induce producers to reduce polypropylene inside the mixture to the advantage of LDPE , creating situations of structural weakness that should be compensated with the addition of HDPE and / or mineral fillers. The study of such complex recipes is certainly not recommended in the production of elements on which one has to walk safely, in order to avoid accidents, because they require a high technical competence and the control of the incoming input through frequent laboratory analyzes. In some cases a mixture of HDPE is used which can be composed of granules deriving from the processing of caps in the beverage sector or with mixed compounds with caps and detergent bottles. According to the data collected we can indicate some differences: a) The production of recycled plastic crawl spaces using granules coming from HDPE plugs means having to work a raw material that has certainly a lower fluidity than the PP + PE compound, normally 1.5-2 to 2.16 Kg ./190° against a MFI 5-6 to 2.16 Kg./230°. This means that the size of the press to be used must also be taken into account as the HDPE polymer is certainly less fluid. The mechanical characteristics of this compound can be summarized in a good compressive strength and an excellent resistance to bending and torsion of the molded elements. However, there is an important factor that could influence the choice of this polymer. In the presence of very large laying surfaces and in correspondence of peaks of very high temperatures, it is to be considered that the HDPE element, continually coupled with other modules, inside the lattice of the beams, could undergo a deformation important given the reaction to the heat of the sun. The problem can be solved, in the granulation phase, by adding a percentage of mineral charge that sterilizes the expansive reactions of the HDPE. b) There are cases in which the resistance of the module is a fundamental element and, in the presence of thin thicknesses of the walls of the product, it is possible to opt for a mix formed by the granulation of caps and HDPE bottles or just the bottles . The reduction of the fluidity of the mixture leads to an increase in the mechanical performance of the elements with the same physical characteristics of the element, with fluidity values ranging from 0.3 to 1 to 2.16 Kg./190°.Automatic translation. We apologize for any inaccuracies. Original article in Italian.
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Influence of Humidity on Mechanical Properties of Paper MaterialsIntegrated Study on Fibers and Fiber Networks to Analyze the Effect of Humidity on Paper Mechanicsby Marco ArezioHumidity is a silent yet powerful influence across many technical and industrial domains. In paper — a material that seems simple and familiar — its effect is far from negligible.It’s not just a matter of curling edges or softened surfaces. What’s at play is a deep, complex transformation in the mechanical properties of paper that occurs at the very core of its structure: the cellulose fibers. A recent study approached this complexity with an original and integrated methodology, combining microscale experimentation and numerical simulation to explore how humidity impacts the mechanics and failure of paper materials — both at the level of the individual fiber and the larger fiber network.Humidity and Paper: An Intimate, Delicate RelationshipPaper is inherently hygroscopic. The cellulose fibers it’s made of naturally absorb and release moisture in response to the surrounding environment. This ongoing exchange with atmospheric humidity affects not only the dimensions of the fibers — which expand or contract — but also their mechanical response to stress, such as tension, bending, or compression.On a macroscopic scale, this translates into tangible variations in strength, stiffness, and the manner in which the paper fails. But to truly understand these phenomena, one must delve into the material’s interior — where fibers intersect, bind together, and react in diverse ways to moisture.Zooming In: What Happens to a Single FiberTo examine the behavior of fibers in humid environments, researchers designed a series of controlled experiments aimed at isolating the individual elements of the paper structure. Fibers were manually extracted from sheets, individually analyzed, and subjected to varying levels of relative humidity.The techniques used left no doubt about the precision of the analysis. Atomic Force Microscopy (AFM) was employed to measure the elastic modulus at the nanoscale, while confocal laser scanning microscopy was used to evaluate hygroscopic expansion.The observations revealed a clear, consistent behavior: as humidity increases, fibers become softer, less stiff, and more prone to deformation. Young’s modulus — a key indicator of elasticity — decreased significantly, while hygroscopic expansion caused the fibers to elongate. This change was not merely quantitative, but also qualitative: humidity altered the stress response of the fibers, making them more susceptible to rupture and progressive failure.From Fiber to Sheet: Simulating the Fiber NetworkPaper is not simply a collection of isolated fibers. Its overall behavior depends on a complex, densely entangled, and oriented network. To understand this dimension, the study relied on numerical modeling, building a digital representation of fiber networks using the Finite Element Method (FEM).This sophisticated approach allowed the simulation of the material’s response to various humidity levels, taking into account factors such as fiber orientation, anisotropy, and — critically — the nature of interfiber bonds.These bonds, the points where fibers touch, adhere, and transfer forces, are the mechanical heart of the network. The study modeled them using cohesive zones, which degrade with increased humidity, mirroring the behavior seen in experiments.The result was a simulation capable of accurately predicting how the fiber network’s strength changes, how deformations are distributed, and where failure is most likely to occur.When Simulation Confirms ExperimentationOne of the most convincing aspects of this work is the consistency between experimental data and simulation outcomes. The two approaches — empirical and computational — converged on common ground, reinforcing each other’s observations.Both revealed that rising humidity leads to a progressive loss of stiffness in the fiber network, accompanied by increased extensibility. In other words, the material becomes more deformable but less resistant.Moreover, the manner in which paper breaks also changes. Under dry conditions, failure tends to be abrupt and localized; in humid environments, it occurs more diffusely across larger areas of the network, with a more plastic and progressive pattern. This shift has important implications for both the understanding of paper mechanics and its practical applications.Practical Applications and Future OutlookThe findings of this study go far beyond theory. Understanding how humidity affects the mechanical properties of paper has direct implications in several industries. In packaging, for instance, it is crucial to ensure that cellulose-based materials maintain their integrity even in moist environments.This also applies to the food sector, to compostable packaging, and even to the preservation of historical documents and books.Even more compelling are the future prospects. The numerical models developed in this study could be used to simulate new paper formulations — incorporating hydrophobic coatings or reinforced fibers — designed to better resist moisture. This opens up possibilities for creating “smart paper” materials, optimized for specific environmental and functional conditions.Conclusion: Toward a Deeper Science of Natural MaterialsThis study demonstrates the importance of looking beyond the surface of natural materials. Paper, ancient and seemingly simple, reveals a surprisingly intricate mechanical behavior when examined in its microscopic details and environmental interactions.By combining high-precision experimentation with computational modeling, researchers have provided a comprehensive and coherent picture of how humidity influences paper performance.This is more than a scientific curiosity — it is a vital step toward the design of sustainable, efficient, and adaptable materials. Because even a single sheet of paper, when studied with the right tools, can tell us much about the future of bio-based materials and the path toward a more resilient and circular economy.© Reproduction Prohibited
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Reinforced Concrete: What are the Advantages of Polymer Reinforcements instead of SteelSince we know the history of reinforced concrete, whose origins towards the end of the 19th century are not easily attributable, we can say that the marriage between concrete and steel was stainless. The birth of this union can be traced back to a series of characters who experimented with the combination of cement mortar and iron on several occasions. We can mention William Wilkinson, English, who in 1854 filed a patent for the construction of fireproof roofs and walls made of reinforced concrete, while in 1855, during the universal exposition in Paris the French lawyer J.L. Lambot presented a metal boat model covered with a layer of concrete. To quote the Italian C. Gabellini who in 1890 the construction of naval hulls in reinforced concrete began but, if we look at the world of construction to which he is associated normally reinforced concrete, it appears that the first slab for a building was designed and built in 1879 by the French engineer Francois Hennebique. Many others followed, bringing the combination of cement (concrete) and steel reinforcement to the center of the works and applications, up to a very wide diffusion in all the structural works of the present day. With the advancement of research and knowledge on alternative structural materials, it was discovered that the use of some composite polymers could improve the performance and durability of load-bearing structures in reinforced concrete, precisely in light of recent events in which structures have been seen collapsing due to the wear of the materials that compose them. Eng. Casadei Paolo, who illustrates the recent discoveries about the use of reinforcement in reinforced composite materials (GFRP) to replace common steel reinforcing bars. They are dramatically under the eyes of all the problems of Italian infrastructures, the result of a design and construction that dates back to the first post-war period and a lack of knowledge about the phenomena of degradation and durability. Today, thanks to technological innovation and research, alternative scenarios can finally open up. Sireg Geotech has been working for some time and with foresight, on an important innovation that will have a strategic impact on the construction and infrastructure sector, guaranteeing the necessary durability for infrastructures and finally allowing the concrete to be applied successfully even in particularly aggressive environments subject to constant degradation. The state of the art of Italian infrastructures The collapse of various infrastructures, including that of the bridge in Lunigiana up to the striking and catastrophic collapse of the Morandi bridge in Genoa, have shown that it is no longer possible neglect a careful analysis of our dated infrastructures both from the point of view of the degradation of the materials with which they were made, and also from the simple point of view of the initial loads for which they were designed, to end up with the issue of poor conditions of maintenance. The massive inspection plan currently underway is certainly a first step that will allow us to carefully evaluate the safety of our infrastructure assets, then intervening on existing structures in a way precise and targeted, but still leaves a question mark about our future open: We will continue to build as we have always done or, with a view to sustainability, durability and reduction of costs associated with maintenance, we will evaluate new materials that are more durable and with less impact environmental? Answering this question today becomes crucial for an effective investment in our infrastructures, be they major works or works of minor importance, but still strategic for the economic development of the our country. Future scenarios for sustainable infrastructure renovation with GFRP bars The use of fiber-reinforced composite FRP (Fiber Reinforced Polymer) bars to replace the steel rod for the construction of structural elements in reinforced concrete. This type of bars is made with fibers of various kinds, among which glass and carbon are certainly the most used materials, with glass that unwinds without the dominant role is a shadow of doubt thanks to a series of chemical-mechanical characteristics which, in relation to costs, make it the most adopted solution for this type of applications to date. The diffusion of bars in GFRP is favored primarily by the fundamental property of these materials, namely their undisputed greater durability due to the fact that they are not susceptible in any way to corrosion phenomena. This makes them particularly suitable in all applications where the work or the structural element is particularly subject to corrosion phenomena. Just think for example of the bridge decks which during the winter are particularly exposed to the chlorides adopted to prevent the formation of frost on the road surface, to the canals for the water drainage or at the docks and piers by the sea or, again, to any reinforced concrete product in an industrial environment exposed to particularly aggressive environments. Recent studies have shown that the useful life of a structure reinforced with this new technology can reach up to 100 years without any particular precautions regarding the nature of the concrete or other construction details, necessary instead in the case of reinforced concrete structures traditionally reinforced with steel rods. However, there are several other properties of these materials that must certainly be mentioned in the comparison with steel in order to make appropriate design choices. The GFRP rods are non-magnetic and are not heat conductors, therefore they find a congenial application in all artifacts exposed to stray currents, solving the problem of typical corrosion steel reinforcements which are in fact incompatible with this type of application. Just think, for example, of all the infrastructures related to the railway sector or motorway gates with electronic recognition systems. Another not negligible advantage in the use of GFRP reinforcements is the ease and speed of installation thanks to their reduced weight, about a quarter of that of steel. This undisputed lightness makes the product particularly easy to move on the ground, so much so that several studies have shown time savings of up to 40-50% compared to laying an equivalent steel armor. Which parameters to keep an eye on in the design and construction of these materials Alongside all these aspects that have made the technology particularly attractive according to the different uses, a series of other aspects must certainly be highlighted that require attention to those who want to start designing. First of all, it should be noted that the GFRP bars for structural uses are produced according to the pultrusion technique using E-CR glass fiber - known for its mechanical characteristics and improved durability compared to traditional E-glass - and a resin matrix of vinylester or thermosetting nature. This means that once hardened it can no longer be modeled, that is, the process by which the bars are machined to make brackets and / or bent parts must be performed in the production phase of the bar itself and not in subsequent times, as is usually the case with construction steel. Again, the bending radii of the bars are not the same commonly known for steel rods, but they have slightly larger dimensions to try to minimize the negative impact of bending on the mechanical characteristics of the bent part with respect to the straight part of the bar itself, as well as for industrial production reasons that see this process as one of the main obstacles. The table below shows the mechanical characteristics of the Glasspree® bars by Sireg Geotech in fiberglass and vinylester resin. By observing the table you can see how the mechanical characteristics of the bars vary as the diameter varies, with smaller diameters having higher mechanical characteristics than larger ones and , in general, with mechanical traction performance much higher than that of a traditional steel rod with improved adhesion. If on the one hand the tensile strength can induce higher mechanical performance, on the other hand the elastic modulus is about a quarter compared to that of steel, equal to 46Gpa in this specific case. This therefore means that if, on the one hand, in an ultimate limit state check one could expect to be able to make an equivalent section with smaller or smaller diameters of material, on the other hand in the verifications at the limit states of exercise it will often be necessary to adopt more material due to the lower elastic modulus. As regards the shear checks, for the reasons set out above, the bent part of a bar does not resist like the straight part, to the point that the table shows it can be seen how a bar bent by 90 ° loses about 60% of the declared resistance of the straight part. This last aspect is absolutely fundamental and to be kept in mind when dealing with the design of shear reinforcements or those requiring the presence of bent bars. It is therefore essential, when approaching a design with these materials, to refer to technical data sheets in which these parameters are clearly highlighted, together with the standard against which these values were obtained. In Europe, the reference standard is ISO 10406-1 and other commonly recognized international standards. In the USA and Canada, employment and regulations are one step ahead In the United States and Canada, the use of these materials today is seeing an ever-increasing increase, certainly thanks to the great impulse favored by a development of the regulatory framework and standards qualification that allowed a rapid implementation. Until twenty years ago, university laboratories were studying the use of these materials only for pilot applications, while today we are spectators of a gradual, but always more widespread use, mainly in the infrastructural field with permanent works such as bridges, canals and others in various sectors. The success of this technology on the American and Canadian markets has certainly been favored by the rapid but still careful and gradual development of documents such as the ACI 440.1R-15 "Guide for the Design and Construction of Structural Concrete Reinforced with Fiber-Reinforced Polymer (FRP) Bars" from the American Concrete Institute and the "AASHTO LRFD Bridge Design Guide Specifications for GFRP-Reinforced Concrete" from the American Association of State Highway and Transportation Officials representing today the most up-to-date standards for the design of reinforced concrete elements reinforced with fiberglass bars. Regulatory situation in Italy and Europe In the old continent and especially in Italy, the regulatory framework presents a situation that requires rapid modernization and alignment with current design standards or the Technical Standards for Construction (NTC) 2018. The reference document is the CNR-DT 203-2006 published more than 15 years ago and therefore the son of the Ministerial Decree of 9 January 1996 and of studies that are now extremely conservative and dated. However, one of the aspects that has hindered and still holds back the development of this very promising technology is certainly the absence of a regulatory framework to meet the requirements of chapter 11 of the NTC 2018, for which all construction materials for structural use must be CE marked or with national certification that allows them to define their essential characteristics and can guarantee their constant performance over time. Automatic translation. We apologize for any inaccuracies. Original article in Italian.
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What is OCC Carton and How is it RecycledWhat is OCC Carton and How is it RecycledIt seems a strange acronym, OCC, but the experts classify as OCC a corrugated cardboard suitable for the formation of boxes and packaging, in which the walls have the task of protecting the goods inside and assume a resistant behavior during handling and transport. Usually it consists from two sheets of flat paper enclosing a light corrugated layer which, thanks to the vaulted shape, gives the sandwich a good resistance. Corrugated cardboard, or OCC, is a very common element in the packaging sector and is also a product that has a high degree of recycling, in fact, according to data from Corrugated Packaging Alliance , a box made from corrugated cardboard, is made up of approximately 50% recycled material. With the increase in micro shipments by online commerce, the quantity of corrugated cardboard in household solid waste is taking on a relevant position, without forgetting the traditional distribution and industry market. OCC cartons can be reused or recycled creating a circularity chain that improves the environment and our lives. Among the advantages of reusing the product, we can include the saving of water that the paper mill uses to create the new paper pulp, and therefore of the energy for the process that creates CO2 and other pollutants such as sulfur or volatile organic chemicals. In the context of OCC cardboard recycling we can mention the reduction in the use of virgin wood which is used to produce natural fibers for the paper. To make a ton of virgin cardboard, three tons of trees are needed, which suggests the importance of reusing and recycling cardboard. As regards the OCC that is sent for recycling at the paper mills, through the collection centers, it is important that whoever delivers the cardboard to be recycled has the care remove different materials present on the boxes or boxes, which would compromise their recycling or pollute the process. The corrugated cardboard must be flattened and packed to form uniform bales in order to reduce their volume to minimize the cost and environmental impact of handling to the centers recycling. After the transformation of the OCC inside the paper mills, the recycled fibers will be reused, in the most suitable percentages, mixed with the virgin fibers based on the types of packaging to be made, to create new paper and cardboard packaging.See more info about recycling Automatic translation. We apologize for any inaccuracies. Original article in Italian.
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Ecological Screen Printing Inks: Green Revolution in PrintingComplete Guide to the Environmental and Operational Benefits of Sustainable InksGrowing environmental awareness and increasingly stringent regulations have pushed the screen printing industry towards the adoption of more sustainable inks.Ecological screen printing inks represent an innovative and responsible response to this need, combining high-level printing performance with a reduced environmental impact.In this article, we will explore the nature, production and advantages of eco-friendly screen printing inks over traditional alternatives.Definition and Types of Ecological Screen Printing InksEco-friendly screen printing inks are special formulations designed to minimize the environmental impact associated with the production, use and disposal of inks used in the screen printing industry.This category of inks stands out for the use of less harmful, sustainable components and, where possible, derived from renewable sources. The definition of “green” encompasses a range of attributes, including reducing the use of toxic substances, decreasing emissions of volatile organic compounds (VOCs), and using biodegradable or recyclable materials.Types of Ecological Screen Printing InksThe diversification of ecological screen printing inks allows them to respond to specific sustainability and application needs, mainly including:Water-based inksThese inks use water as the primary solvent, largely replacing petroleum-based solvents. They are less volatile and toxic than their solvent counterparts. They are particularly suitable for printing on fabrics, paper and cardboard, where the absorption of the material compensates for the slower drying speed compared to solvent inks.UV inksUV inks harden or polymerize when exposed to ultraviolet light. This process transforms the ink from liquid to solid without the evaporation of solvents, almost completely eliminating VOC emissions. These inks are used on a wide range of substrates, including plastic, metal, glass and wood, thanks to their excellent adhesion and durability.Soy and Vegetable Based InksComposed primarily of vegetable oils (such as soybean oil), these inks replace mineral oils and petroleum-based solvents. They offer high-quality printing with less dependence on fossil resources. They are ideal for printing on paper and cardboard, offering good print definition and helping to facilitate the recycling of printed material.Common BenefitsDespite the differences, all these typologies share key advantages that make them preferable in an ecological context:Lower Environmental Impact: They reduce harmful emissions and the use of non-renewable resources.Safety and Health at Work: They reduce exposure to dangerous substances for operators.Compatibility with Environmental Regulations: They help companies comply with increasingly rigorous environmental standards and regulations.The choice between these types depends on the specific application needs, the desired sustainability and the characteristics of the material to be printed. The continuing evolution of eco-friendly screen printing ink technology promises further improvements in performance and environmental impact, pushing the industry towards more sustainable practices.Where and how screen printing inks are usedScreen printing inks find application in a wide range of sectors and on different types of materials, thanks to their versatility and ability to offer high-quality prints on different surfaces. Below, some of the main application areas of screen printing inks are explored:TextileScreen printing is a technique widely used in the textile sector for the decoration of clothing, furnishing fabrics and accessories. Water-based screen printing inks, in particular, are very popular for printing on fabrics, as they are less harmful to the environment and to those wearing the printed garments.Paper and CardboardScreen printing inks are used for printing on paper and cardboard in a variety of applications, including packaging, posters, postcards, and promotional materials. Screen printing allows you to obtain particular effects, such as shiny, metallic or textured finishes, which add value to printed objects.ElectronicsIn the electronics sector, screen printing inks are used for printing printed circuits, membrane keyboards, displays and various electronic components. In this context, conductive inks and UV inks are often used due to their specific properties, such as electrical conductivity or resistance to solvents and abrasion.Glass and CeramicsScreen printing is also used in glass and ceramic decoration, for example in bottles, glasses, tiles and crockery. The inks used in these applications must withstand high temperatures and baking processes, maintaining brilliance and color fidelity.Advertising and Signage IndustryScreen printing inks are ideal for the production of signs, stickers, banners, and promotional material thanks to their external durability and resistance to atmospheric agents. This application takes advantage of screen printing's ability to print on plastic and metallic materials, as well as more traditional supports.Promotional ItemsPromotional items such as pens, USB sticks, gadgets and gift items are often decorated using screen printing. The technique allows you to apply logos and promotional messages on surfaces of different shapes and materials, with high precision and quality.Production Process of Ecological Screen Printing InksThe production process of eco-friendly screen printing inks represents an expression of commitment to sustainability and innovation in the printing industry.This process stands out for its emphasis on the selection of raw materials with less impact on the environment, the optimization of production processes to reduce waste and energy consumption, and attention to the safety and health of operators. Let's see the main phases in detail:Selection of Raw MaterialsThe first phase in the production process of ecological screen printing inks concerns the careful selection of raw materials. This includes:Eco-friendly pigments: We opt for non-toxic pigments and preferably of natural origin or with less impact on the environment compared to traditional synthetic pigments.Natural or Biodegradable Binders: Vegetable oils (such as soybean oil) or other natural substances are used as binders in place of petroleum-based binders.Solvents with Low Environmental Impact: In cases where the use of solvents is necessary, those with low volatility and less toxicity are preferred, such as water in water-based inks.Ink FormulationDuring the formulation phase, selected ingredients are mixed in precise proportions to achieve desired ink characteristics, such as viscosity, color, and fastness. This process requires specific technical skills to balance the ecological properties of the ink with the needs of printing performance.Production and Quality ControlOnce formulated, the ink undergoes a manufacturing process that may include steps such as grinding to reduce the size of the pigments and improve the finish, and homogenization to ensure uniform distribution of the components.Throughout the manufacturing process, strict quality controls are applied to ensure that the final ink meets technical and environmental specifications.Packaging and DistributionThe ecological screen printing inks are then packaged in containers specially chosen to minimize the environmental impact, preferring recycled or recyclable materials. Distribution is planned to reduce CO2 emissions, for example by grouping shipments or using environmentally friendly means of transport.Problems and InnovationsThe production of ecological screen printing inks presents various problems, such as maintaining printing performance at levels comparable to those of traditional inks while respecting ecological criteria.Constant innovation in materials and production techniques is key to overcoming these issues, making eco-friendly inks an increasingly viable choice for the printing industry.Environmental and Operational Benefits of Eco-Friendly Screen Printing InksEco-friendly screen printing inks offer a number of significant advantages over their traditional counterparts, not only from an environmental perspective but also in operational terms.These benefits reflect the growing importance of sustainability in manufacturing and purchasing decisions, without neglecting the efficiency and quality of the printing process.Environmental BenefitsReduction of Harmful EmissionsEco-friendly inks minimize or completely eliminate the use of volatile solvents, responsible for emissions of volatile organic compounds (VOCs) into the atmosphere. This not only reduces air pollution but also helps to improve the quality of the working environment by reducing workers' exposure to potentially harmful substances.Less Impact on Health and SafetyThe safer composition of eco-friendly screen printing inks reduces the risk of allergic reactions, respiratory problems and other health problems related to the use of harsh chemicals. This also means that fewer personal protection and ventilation measures may be needed, making the working environment safer and more pleasant.Sustainable Use of ResourcesThe use of renewable raw materials, such as vegetable oils, and pigments with less impact on the environment, promotes the sustainable use of resources. Furthermore, the high biodegradability of many ecological inks facilitates the disposal process, reducing the ecological footprint of the finished product.Operational AdvantagesEfficiency in Cleaning and MaintenanceWater-based and UV inks require less aggressive cleaning procedures than solvent-based inks. This translates into less downtime and reduced use of chemicals for cleaning, resulting in lower operating costs and less environmental impact.Versatility and Print QualityDespite their eco-friendly nature, eco-friendly screen printing inks offer excellent print quality, with vibrant colors and good resistance over time. They are suitable for a wide range of substrates, including fabrics, paper, plastic and metal, offering great versatility to operators in the sector.Compatibility with Environmental RegulationsThe use of ecological inks facilitates compliance with increasingly stringent environmental regulations, helping companies to avoid sanctions and improve their image among consumers, who are increasingly attentive to sustainability.Comparison with Traditional InksThe transition towards the use of eco-friendly screen printing inks represents a significant turning point for the printing industry, responding to the growing need for environmental sustainability. To better understand the added value of eco-friendly inks, it is useful to examine the main differences compared to traditional screen printing inks in various aspects.Chemical compositionTraditional Inks: Traditionally, screen printing inks are formulated with a base of volatile solvents, synthetic pigments, and petroleum-derived resins, which can emit volatile organic compounds (VOCs) harmful to the environment and human health.Ecological Inks: On the contrary, ecological inks are developed with the intention of reducing or eliminating the presence of such harmful substances. They use water-based solvents, vegetable oils, natural or less toxic pigments, and biodegradable binders, resulting in significantly reduced VOC emissions.Environmental impactTraditional Inks: The use of solvents and petroleum-based components entails a high environmental impact, from production to disposal, including risks of contamination of air, water and soil.Ecological Inks: Ecological screen printing inks minimize environmental impact at all stages of their life cycle. Their production, use, and disposal present much lower environmental risks, thanks to the use of renewable raw materials and reduced toxicity.Health and Safety at WorkTraditional Inks: Long-term exposure to solvents and other toxic components of traditional inks can have negative effects on the health of operators, requiring the use of personal protective equipment and adequate ventilation systems.Eco-Friendly Inks: The safer formulation of eco-friendly inks reduces the risk of health problems and improves working conditions, limiting the need for specialist protection and ventilation measures.Performance and ApplicabilityTraditional Inks: Traditional inks are known for their durability, weather resistance, and versatility on different surfaces. These characteristics have made them the prevalent choice in many industrial and commercial applications.Ecological Inks: Although in the past ecological inks may have had limitations in terms of performance compared to traditional inks, recent technological developments have significantly improved their quality, resistance and versatility, making them competitive in multiple applications.CostsTraditional Inks: Generally, traditional inks are lower in cost than eco-friendly variants, primarily due to the widespread availability and lower cost of petroleum-based raw materials.Eco-Friendly Inks: Eco-friendly inks may have a higher initial cost, given the higher price of sustainable raw materials and less polluting production processes. However, this cost is often offset by the benefits in terms of health, safety and environmental compliance, as well as improved corporate image.
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Increase the fire resistance of concrete with recycled pp fibersRecycled tires offer polypropylene fibers from the reinforcement fabric to increase the fire resistance of the concreteAccording to a study by the University of Sheffield, the use of polypropylene textile reinforcement (fber) present in recycled tires helps concrete structures better withstand fire. That the use of polypropylene (PP) fibers in the concrete mixtures used for greater fire resistance was a well-known practice is not new, interesting thing from the point of view of the circular economy , is that the reinforcement fabric contained in recycled tires it has been studied to understand its fire behavior in a concrete structure. The use of polypropylene fibers, in particularly fire-resistant concrete recipes, is indicated to reduce the phenomenon of conglomerate explosion under the effect of heat. The study has shown that the use of recycled PP fibers , in this case from recycled tires, does a job equivalent to virgin fibers, with savings in energy and natural resources for their production. But what is the advantage of using recycled PP fibers in the event of a fire? The concrete structure, under the effect of fire, considerably increases its temperature and, due to the humidity trapped inside, given by the ratio of water and cement during the formation of the structures, it could detonate concrete parts in an attempt to leave the hotel. In this case, the PP fibers, during the heating of the structure , gradually dissolve , creating a network of micro tunnels that allow moisture to find leaks to the outside. One might think that the creation of these micro pathways could reduce the mechanical strength and rigidity of concrete, but in reality the volume of the fibers is so limited that it does not affect these factors according to the University of Sheffield. The use of recycled PP fibers not only has the function of protecting concrete from explosions caused by humidity trapped inside, but also of protecting reinforcement rods . In fact, these, if they were in contact with the surfaces in direct contact with the heat source due to the loss of the concrete covering layer, would undergo rapid structural deteriorations. The only purpose of adding recycled PP fibers is to dissolve them when needed, reducing the internal pressure of the conglomerate. The studies will continue with the aim of testing different types of cement mixes, with different grain sizes of aggregates, subjected to different temperatures, with the aim of studying, at the microstructure level, the damage caused by fire and structural changes.See more info aboutAutomatic translation. We apologize for any inaccuracies. Original article in Italian.
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Recycled Plastic and Gamma Rays Increase Concrete PerformanceRecycled Plastic and Gamma Rays Increase Concrete PerformanceThere are several applications of recycled plastic, or non-recyclable plastic waste, which have been tested in the construction sector, with the aim of helping the system to dispose of the waste that we produce and, at the same time, improve the circularity of a sector that needs to integrate into the great common goal of producing and consuming the least amount of natural resources and having as little impact on the environment as possible. The use of recycled plastic is already present in many commonly used products in construction, as we will see later, but fewer successful projects have been in the use of non-recyclable plastics, such as for example polylaminates or waste from washing plants, a mix of heterogeneous plastics that cannot be separated mechanically. In the road asphalt sector, mixtures of bitumen and non-recyclable ground plastic have been successfully used as described in the article that you can read below. An interesting project concerns the use of ground plastic in cement mixtures, the result of various attempts, some unsuccessful, which allowed to find the key to having a cement mixture with improved performance compared to the traditional one, as Luisa Dalaro tells us. In fact, we don't want to talk about the concrete we all know, but about a particular concrete, “plastic concrete”. One might think of a cement with lower performance, poor quality at first glance, but instead it can be a valid alternative to the classic concrete, in a context of growing interest in the recycling of materials deriving from urban and industrial solid waste. This modus operandi represents an efficient solution to the depletion of natural resources and, at the same time, an effective method of waste disposal. Recycled materials are a valid alternative to typical building materials, as long as the transformation process requires a lower consumption of energy and raw materials than the production from scratch . Much of the waste is plastic, so plastic is a material that must be recycled or reused as much as possible. In construction, recycled plastic is widely used for the construction of floors, insulating panels, pipes, crawl spaces and window frames. More extreme experiments involve the use of plastic bottles in the concrete casting. In particular, the recycled plastic of used bottles could lead to the production of a more resistant and ecological concrete. More resistant eco concrete: experimentation And here is the result of a research by some scholars of the MIT (Massachusetts Institute of Technology), whose proposal could be the solution capable of reducing the environmental impact of concrete production and find large-scale use of recycled plastic. MIT scholars had hypothesized that by mixing flakes of recycled plastic into the cement mixture, the physical properties of the latter could have been improved, but unfortunately the result it was disappointing. The scientists continuing their research on this path, found that by subjecting the plastic to gamma rays, using a cobalt-60 irradiator that emits gamma rays (usually used for decontaminate food), the recycled and then pulverized plastic flakes crystallized, becoming perfectly assimilable and “incorporated in a uniform manner” by the concrete. The powder thus obtained was combined with various cementitious compounds, which were then poured into cylindrical molds, and then subjected, once solidified, to tests of compression. Test results confirmed that plastic cement is about 15% stronger than traditional concrete. The new concrete mix has shown incredible properties: such as increased strength and flexibility. "We observed that within the parameters of our test program, the higher the irradiated dose, the higher the strength of the concrete, so more research is needed to customize the mix and optimize the process with irradiation to get even more results. best. The process we have developed has enormous potential both in terms of sustainability and resistance. " - Kupwade-Patil, MIT researcher.Related articles:Glass and Non-Recyclable Plastic: is there an Alternative to Landfill? Automatic translation. We apologize for any inaccuracies. Original article in Italian.
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Why Choose Recycled PVC Blocks Instead of Concrete?Why Choose Recycled PVC Blocks Instead of Concrete?Many fundamental choices are too often made by making a mathematical price comparison, between two elements taken into consideration that apparently seem to have the same characteristics and the same functions.In the field of construction, an activity that has an important environmental impact and where the circularity of the products used has not yet reached full capacity, very often two products to be used only on the basis of price, often choosing the lowest one. The decision to lay the cheaper one, often the concrete one, comes from the conviction that the two products are replaceable between the concrete block and the recycled PVC block and that we have the same technical and durability functions. Although the cost of the two products is on average close between the two, the choice of using the cheapest one creates an apparent saving, but in reality the cost per square meter over the years of the concrete element can be significantly higher than that of recycled PVC. In the weighted decision between one product and another, the price variable alone cannot condition the purchase, as it can rightly be taken into consideration when all the other differences have also been analyzed and evaluated economically. Let's see some: • The recycled PVC brick has a weight per square meter lower than those in concrete. Each designer should take into consideration the greater environmental impact that a greater number of transports, with the same surface laid, affects the carbonization count. • The recycled PVC block is not damaged by road salt, damage that affects the concrete blocks with maintenance costs in important years. • The recycled PVC block is an electrically insulated surface and can also be used in industrial contexts where leakage current could be a danger. • The recycled PVC brick has a good bending value, this allows the product to absorb small and medium imperfections of the substrate without breaking. • The recycled PVC block has a decidedly reduced installation cost compared to the paving in self-locking concrete blocks, as the stratification it needs, on compact ground , it is only about 5 cm. of sand. This also affects the environmental impact of the transport of raw materials which are decidedly against the concrete block. It also has an intuitive and comfortable pose, typical of DIY, so as to allow anyone to create the required flooring. • The recycled PVC brick can be easily cut with a non-professional hose or saw, concrete one needs equipment with professional grade diamond blades. • The recycled PVC brick is composed of plastic waste derived from the processing of electrical cables, which are shredded, selected and extruded, contributing to the full circularity of the raw material. Furthermore, the solid PVC laid at the end of its life can be recycled again. Each flooring made with solid PVC helps to reduce the amount of waste we produce daily. • The recycled PVC brick is waterproof, this involves a lower risk of breakage in freeze and thaw cycles. • The recycled PVC brick, as it is non-porous, cannot be stained with oils or fuels that can lose the means of transport, which happens indelibly with the porous concrete pavement. Diesel, oil or petrol stains remain permanently on the cement surfaces, while those made with a solid recycled PVC block can be easily washed with a jet of pressurized water. • The traditional flooring brick is normally composed of cement, which derives from the processing of natural stones by excavation, then undergoing a firing process that uses fossil energy in great quantity. Cement is combined with sand to form a cement mixture, sand that comes from excavating land or dredging rivers, irreparably consuming natural resources. The third element necessary to produce concrete blocks is water, which normally affects a percentage of more than 40% per gram of cement used. So the environmental impact of a square meter of concrete blocks is incredibly higher than one made of recycled PVC. • With regard to the resistance to compression, driveability, tire torsion, reaction to fire, cigarette burns and slipperiness, the two products are on average equivalent. In the light of these data, the price comparison between a solid recycled PVC and a concrete one must take into account all these points, which are accounted for, economically and morally, they bring PVC brick to a much lower overall cost than concrete or asphalt paving.Automatic translation. We apologize for any inaccuracies. Original article in Italian.
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Pulper waste from paper mills: waste or resource?Pulp Waste: How to Turn It Into Molding Polymers in 2026 by Marco Arezio | Updated: March 2026 | Reading time: ~9 min European paper mills face a growing production and environmental challenge every year: managing pulper waste, the solid residue generated during the recycling of waste paper. In 2026, thanks to technological advances and a regulatory framework increasingly geared towards a circular economy—particularly the new European Packaging Recycling Regulation (PPWR, which came into force in 2025 )—this waste is no longer considered a burdensome waste, but a resource to be recovered in the form of recycled LDPE polymer granules. In this updated guide we analyse the industrial process, the technologies available in 2026, the technical critical issues and the main market outlets for the polymer deriving from pulper waste. What is Pulp Waste? The pulper is the heart of the paper mill recycling process: a cylindrical tank in which waste paper is immersed in water and subjected to intense mechanical agitation to separate the cellulose fibers from the foreign materials. The solid residue that cannot be reintroduced into the production cycle is called pulper waste (or pulper rejects). This waste is primarily composed of aluminum and polyethylene (PE) from multi-material food packaging such as Tetra Pak, beverage cartons, and flexible packaging. According to industry data updated to 2025, approximately 8-12% of incoming paper by weight is converted into pulper waste, with higher peaks in paper mills that process mixed fractions from urban waste sorting. At European level, it is estimated that the paper sector generates over 4 million tonnes of pulp waste every year, with landfill or incineration costs still very high and increasingly less acceptable under regulations. The Recycling Process in European Paper Mills in 2026 The industrial process that leads to the formation of pulper waste is divided into well-defined phases: • Maceration in the tank: the waste paper is introduced into the pulper with hot water (40-60°C) and subjected to a rotating mechanical action until the fibres disintegrate. • Coarse filtration: rotating grids and screens retain large materials (rigid plastics, metals, wood). • Fine filtration: the suspended cellulose fibre is separated from the light materials through centrifuges and pressurised screens. • Collection and dehydration: the residue, still with a high humidity content (60-75%), is dehydrated using screw presses or filter presses before being delivered or recycled. By 2026, many paper mills have integrated automatic pre-separation systems with NIR (Near Infrared) optical sensors that increase the purity of the polymer stream upstream of the pulper, reducing the percentage of residual paper and increasing the yield of the final granule. Composition and Characteristics of Pulper Waste The composition of pulper waste varies depending on the type of incoming paper. A typical average composition (dry weight) is as follows: - Average percentage component (dry) - Polyethylene (LDPE/LLDPE) 55 – 70% - Aluminum (flexible foil) 15 – 25% - Residual cellulose (paper) 5 – 15% - Other polymers (PP, PS, etc.) 2 – 8% - Humidity (on the wet mass) 60 – 75% Energy Enhancement Technologies Available in 2026 2026 marks a technological milestone for pulper waste recycling. The main available supply chains are: 1. Granulation of LDPE polymer (main supply chain) This is the most widespread and established technology. The process involves mechanical and densimetric separation, shredding, intensive washing with hot water, drying (essential to reduce moisture content to below 2%), filtration of the melt through fine mesh screens, and pelletization using an underwater cutting head (underwater pelletizing). The resulting granules are classified as recycled LDPE with an MFI between 1 and 3 g/10 min at 190°C/2.16 kg. 2. Recovery of aluminum through pyrolysis (co-product) Advanced Alurec or Thermovac-type systems separate aluminum from PE through low-temperature pyrolysis (approximately 450-500°C) in an inert atmosphere. The aluminum is recovered with a purity greater than 97%; the pyrolysis gas is used as an internal fuel. This technology, already in use in Spain, Portugal, and Brazil, is becoming widespread in Italy and Germany. 3. Compounds and technical materials In 2026, the production of technical compounds from LDPE pulper granules, mixed with PP, HDPE, or mineral fillers (CaCO3, talc), is growing to obtain materials with customized mechanical properties. Some manufacturers use reactive compatibilizers (e.g., maleic anhydride) to improve the cohesion between the PE and the aluminum residues, increasing the impact resistance of the final product. Technical-Production Critical Issues and How to Resolve Them in 2026 The critical issues already identified in 2020 remain current, but in 2026 we have more mature and effective technical solutions: Criticality 1 – High initial humidity (>60%) Problem: High humidity reduces production yields and causes defects in the granules. Solution 2026: Latest-generation high-pressure screw presses reduce moisture content by up to 30-35%; fluidized bed or hot air drying systems complete the reduction to 1-2% before granulation, eliminating outgassing problems. Criticality 2 – Gas during molding Problem: Residual moisture in the pellet causes bubbles and micropores in molded parts. Solution 2026: Degassing twin-screw extruders with multiple venting zones eliminate residual volatility directly during pelletization, eliminating the need for separate pre-drying. Criticality 3 – Presence of residual paper Problem: Cellulose microparticles clog filters and form micropores in the granules. Solution 2026: Continuous melt filtration systems with automatic candle or rotating disc screen changers, with mesh sizes up to 80-100 microns, ensure effective filtration without production downtime. Criticality 4 – Presence of aluminum and aesthetic appearance Problem: Aluminum flakes create heterogeneous surfaces in the final product. Solution 2026: Using carbon black-based opacifying pigments or specific masterbatches allows for standardized product aesthetics. Some processors emphasize the metallic effect as a distinctive aesthetic feature (a 'marble look' effect). Characteristics of LDPE Granules from Pulper in 2026 In 2026, the granule resulting from the valorization of pulper waste has the following standard technical characteristics: • Base polymer: LDPE with content above 90% • MFI (Melt Flow Index): 1-3 g/10 min at 190°C / 2.16 kg (ASTM D1238) • DSC: regular profile, melting temperature 108-115°C • Residual aluminum content: 2-8% by weight (flexible strips) • Residual cellulose content:
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Synthetic aggregates from steel mill black slag (EAF): production, qualification and high-performance applicationsFrom slag to product: how to obtain artificial aggregates that comply with European standards, with superior mechanical performance and certified environmental control by Marco Arezio Artificial aggregates obtained from black slag from electric arc furnaces (EAF) are a valid alternative to natural and recycled aggregates in numerous civil engineering projects. Their industrial nature allows their composition and performance to be controlled through process procedures, transforming the slag from a by-product into certified aggregate when it meets chemical-physical, environmental, and compliance requirements. Industrial experience has shown that the production of aggregates from slag can be structured as a parallel process to that of steel, with in-line and batch controls that ensure repeatability and quality of the finished product. Mineralogy and basicity index: the key to slag stability EAF slag is an oxide system in which glassy and ceramic phases coexist with silicates and spinels. Recurring constituents include calcium silicates (2CaO SiO₂ and 3CaO SiO₂), mixed magnesium and iron oxides, spinels containing chromium and manganese, as well as aluminates and intermediate phases between anorthite and gehlenite. A key operating parameter is the basicity index (IB₂ = %CaO/%SiO₂), which correlates composition, reactivity, and volumetric stability and guides the selection of fluxes and cooling cycles. Process management based on the basicity index reduces variability and promotes consistent aggregate performance. From the kiln to the granulometry: the industrial process for producing controlled aggregates The slag-to-product journey integrates targeted choices of scrap, fluxes and additives, dumping practices, quenching and controlled cooling, as well as rapid basicity checks. This is followed by curing, crushing, screening, and batch-by-batch traceability, with sampling carried out according to UNI standards for the various intended uses: unbound and hydraulically bound materials, concrete, and bituminous mixtures. This setting allows the introduction of standard granulometric classes (0/5, 5/10, 10/20, 30/40, 0/20, 0/125) onto the market, guaranteeing intra-batch homogeneity and availability of stocks suitable for large construction sites. Tests and performance: density, LA, Micro-Deval, PSV and freeze-thaw From a mechanical and geotechnical point of view, EAF aggregates show high values of density (3.6–3.8 Mg/m³), excellent resistance to fragmentation (Los Angeles 13–16), resistance to wet wear (Micro-Deval 5–6), resistance to polishing (PSV ~53–54) and favourable freeze-thaw behaviour with losses around 1 %. These parameters are often higher than those of ordinary natural aggregates and significantly better than those of recycled aggregates, resulting in less wear and tear during operation and greater durability, especially in roadbeds subjected to heavy traffic. Regulatory compliance: EN 13242, EN 12620, EN 13043 and AVCP 2+ EAF slag aggregates are covered by European product standards: EN 13242 for unbound and hydraulically bound materials, EN 12620 for aggregates for concrete, and EN 13043 for bituminous mixtures and surface treatments. These standards address natural, artificial, or recycled aggregates without distinction, defining performance categories, tests, and conformity criteria. The CE marking and the Declaration of Performance (DoP) are issued today under the new Regulation (EU) 2024/3110 on construction products, which came into force in January 2025. For aggregates, the system for assessment and verification of constancy of performance (AVCP) is 2+, which includes production control certified by a notified body with initial audit and periodic surveillance. Environmental safety: chromium release testing and control The environmental compatibility of EAF aggregates is guaranteed by leaching tests, which verify their safety and compliance with regulatory limits. The spinel microstructure plays an important role in confining chromium, reducing its mobility. The link between chemical composition, basicity index, and release behavior is well documented, enabling prevention strategies right from the process stage. At the regulatory level, environmental qualification integrates with REACH requirements and the European framework for by-products, allowing us to distinguish when waste can be considered a product rather than waste. On-site applications: roads, concrete, bituminous conglomerates and embankments Thanks to their mechanical properties and resistance to polishing, EAF aggregates are particularly suitable for bituminous layers subject to heavy traffic and for non-slip surface treatments. Their density and low porosity favor the production of mixes with high moduli and low wear. In the structural field, proper grain size selection allows for use in concretes compliant with EN 12620, while for roadworks and embankments, EN 13242 regulates their use as unbound or hydraulically bound aggregates. Industrial experience has demonstrated large-scale supplies with repeatable characteristics, a fundamental requirement for public infrastructure. Environmental and economic benefits: circularity, LCA and reduction of natural resources Replacing natural aggregates with EAF aggregates reduces quarrying, conserves non-renewable resources, and limits long-distance transportation, with a positive impact on carbon footprint and land use. Structured industrial production allows for economies of scale and ensures the availability of consistent stocks, facilitating construction site logistics. From this perspective, EAF aggregates represent a mature and technologically proven circular economy solution for the construction sector. Operational conclusions Artificial aggregates from EAF slag demonstrate, when tested in accordance with European standards and performance tests, a competitive technical profile: high mechanical strength, durability under severe conditions and environmental suitability governed by composition and microstructure. Controlling the basicity index, managing cooling cycles, and curing the material are crucial factors in ensuring volumetric stability and repeatable performance. Compliant with the new CPR regulation and certified with the AVCP 2+ system, these aggregates represent an industrial solution in line with the sustainability and circularity objectives set by the European Union. © Reproduction Prohibited Sources Technical document on artificial aggregates from black slag, including a description of the process, controls, and comparison with natural and recycled materials. European product standards: EN 13242, EN 12620, EN 13043. Regulation (EU) 2024/3110 on construction products. Technical documentation on the AVCP 2+ system for aggregates. Comparative studies on the mechanical performance (Los Angeles, Micro-Deval, PSV, freeze-thaw) of EAF aggregates. Analysis of the role of the spinel phase in chromium control and environmental qualification.
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