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Uniaxial and triaxial performance of concrete incorporating oxygen plasma-modified recycled plastic particles
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This is actually a construction materials study, not a human health study, it's about making concrete greener by mixing in recycled plastic waste instead of using only traditional stone materials. Scientists found that treating the plastic bits with a special gas process (plasma) before adding them to concrete helped the plastic bond better with the cement, making the concrete up to 33% stronger. This matters for the environment because it could help reduce plastic waste and reliance on mined materials in construction, though the study doesn't address microplastic release or direct human health effects.
Abstract The increasing accumulation of plastic waste and the depletion of natural mineral aggregates have driven interest in the use of recycled plastic particles as alternative aggregates in concrete. However, weak interfacial bonding between hydrophobic plastic particles and the cement matrix remains a critical limitation. This study investigates the effect of oxygen plasma surface modification on the mechanical performance of concrete incorporating recycled polypropylene flakes (PPF) and polyethylene agglomerates (PEA). Compressive and flexural strength tests, together with triaxial tests under confined conditions, were performed. Surface wettability was evaluated using contact angle measurements, and interfacial morphology was analysed by scanning electron microscopy (SEM). Although plastic particles reduced compressive strength compared to reference concrete, plasma treatment improved mechanical performance, particularly for PEA mixtures, with compressive strength increasing by up to 33% relative to untreated counterparts. Under triaxial loading, concrete specimens containing plasma-treated PEA particles exhibited reduced deformations and improved elastic recovery, indicating enhanced pressure transfer under confinement. SEM analysis confirmed improved interfacial bonding in treated specimens. The results demonstrate that oxygen plasma treatment effectively enhances interfacial properties and multiaxial mechanical performance of concrete incorporating plastic particles, providing novel insights into its behaviour under triaxial loading.
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Note: this paper is about construction materials engineering, not human health, it doesn't involve microplastics or health outcomes. Researchers found that adding a small amount (1%) of a chemical additive called plasticizer to concrete made from recycled construction debris actually makes it stronger and easier to work with than regular concrete, while adding too much weakens it. This matters for sustainable building practices, since it means we can reuse demolished concrete waste instead of mining new materials, but it doesn't directly relate to human health or microplastics.
Effect of Plasticizer on Workability and Compressive Strength of Recycled Coarse Aggregate Concrete
AI summary Read the abstract
Note: This paper is about construction engineering, not human health, it doesn't involve microplastics or health impacts. Researchers found that adding a small amount (1%) of a chemical additive to concrete made from recycled construction waste made it stronger and easier to work with, while adding too much actually weakened it. This matters for sustainable building practices, since it shows we can reuse demolished concrete instead of mining new materials, without sacrificing quality, but the dosage has to be just right.
Influence of plastic waste addition on mechanical properties of cement mortars: An experimental study
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Researchers found that mixing small amounts of ground-up PVC plastic waste (5-10%) into cement mortar actually made it stronger and lighter, offering a promising way to reuse plastic trash in construction instead of sending it to landfills. This matters for human health indirectly: finding practical uses for plastic waste in solid, bound materials like concrete could help reduce the amount of plastic that breaks down into microplastics in our environment, water, and food supply.
Impact of using recycled plastic particles as a partial replacement of aggregates on the mechanical performance of the eco-friendly concrete
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Researchers found that mixing small amounts of recycled plastic waste into concrete (replacing sand or gravel) can create lighter, still-usable building material, best suited for things like sidewalks and paving blocks rather than load-bearing structures. This matters because it offers a practical way to reuse plastic waste instead of sending it to landfills or letting it break down into microplastics that pollute soil, water, and eventually our food and bodies. However, this is a construction materials study, not a health study, so it doesn't directly test whether the concrete itself sheds microplastics over time.
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Researchers found that mixing shredded plastic bottles into concrete, replacing some sand, actually made it stronger when used at the right amount (2%). This matters because it gives plastic waste a useful second life instead of it sitting in landfills or being burned, which releases toxic fumes harmful to human health.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.