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Synergistic impact of recycled PET microparticles on the mechanical performance of high-strength and conventional concretes
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This paper isn't about human health directly—it's about turning recycled plastic bottles (PET) into an ingredient for concrete instead of sending them to landfills. Researchers found that replacing more than 5% of the sand in concrete with crushed plastic makes the concrete noticeably weaker, so they recommend keeping plastic content low and reserving this approach for non-load-bearing uses like sidewalks or decorative structures rather than buildings or bridges.
The global plastic waste crisis demands innovative recycling, such as using recycled polyethylene terephthalate (PET) microparticles as a replacement for natural fine aggregate in concrete. In this study, the volumetric substitution of PET particles (0%, 5%, 10% and 15% by sand weight) on the mechanical properties of conventional concrete (CC) (target compressive strength fc′ = 33 MPa) and high-strength concrete (HSC with 5% microsilica gel + 1% superplasticiser (target fc′ = 45 MPa) was examined, using 144 specimens tested at 7 and 28 days. PET incorporation consistently reduced the compressive strength, splitting tensile strength and modulus of elasticity (MoE). At 10% substitution, fc′ decreased by 24% in CC (from 33 MPa to 25 MPa) and by 22% in HSC (from 45 MPa to 35 MPa). At 15% PET, the reductions were 45% and 31%, respectively. The HSC showed better compressive strength retention but a greater loss in MoE (up to 34% at 15% PET). Unlike studies on PET fibres or macro-recycled aggregates, this work provides the first simultaneous multi-property quantification (here termed ‘synergistic’) of PET microparticle effects across both CC and admixture-optimised HSC, revealing matrix-dependent divergent degradation patterns through volumetric substitution. A practical 5% upper limit is recommended for non- and semi-structural applications, balancing waste utilisation with performance.
More Papers Like This
Performance evaluation of PET-modified concrete with PET granules and manufactured sand as fine aggregates
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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.
Use of Plastic Waste in Concrete : A Comprehensive Review on Strength of Concrete Mixture with Different Material
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This review paper looks at how recycled plastic waste (like plastic bottles) can be mixed into concrete for building construction, finding that small amounts can actually make concrete stronger and lighter while keeping plastic out of landfills. This matters for human health because reducing plastic waste means less of it breaking down into microplastics that end up in our soil, water, and eventually our bodies — though more research is needed to confirm plastic-infused concrete is safe and durable long-term before it's widely used.
Use of Plastic Waste in Concrete : A Comprehensive Review on Strength of Concrete Mixture with Different Material
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This review paper looks at how recycled plastic waste (like PET bottles) can be mixed into concrete for building construction, finding that the right amount can actually improve certain properties while reducing landfill waste. This matters because it offers a practical way to reuse plastic that would otherwise pollute the environment—though the paper focuses on construction benefits rather than directly studying whether this affects microplastic exposure or human health, so more research would be needed to confirm concrete made this way doesn't shed plastic particles over time.
Mechanical Characteristics of Concrete with Partial Replacement of Sand by Waste PET Bottle Fibers
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Researchers found that mixing small amounts of shredded plastic water bottles (2-2.5%) into concrete actually made it stronger, offering a clever way to reuse plastic waste instead of sending it to landfills. While this isn't directly about human health, it matters because it could reduce plastic pollution buildup in our environment—one path toward tackling the growing problem of plastic waste that eventually breaks down into microplastics found in our water, food, and even our bodies.
Valorization of Waste Polyethylene Terephthalate as a Partial Fine Aggregate Replacement in Concrete: An Experimental Assessment of Fresh and Hardened Properties
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Researchers tested using crushed waste plastic bottles (PET) in place of some sand in concrete. As more plastic was added, the concrete became less workable, lighter, and weaker, but mixes with up to 4% plastic still met standards for lightweight, non-structural building uses.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.