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Second Life for Plastic Fibre Waste Difficult to Recover: Partial Replacement of the Binder in Asphalt Concrete Mixtures by Dry Incorporation
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Researchers found that incorporating waste plastic fibers from municipal solid waste into asphalt concrete as a partial bitumen replacement improved resistance to plastic deformation and mechanical performance, with results approaching those of polymer-modified bitumen mixtures while improving material sustainability.
In previous studies, different additives and modifiers have been studied to improve the properties of asphalt concrete mixtures, whose main failures are plastic deformation and cracking. In this research, the improvement of the properties of asphalt concrete mixtures were investigated by introducing residual plastics as a substitute for virgin bitumen, which improves the sustainability of the mixtures. Furthermore, the results obtained from these new mixtures were compared with a mixture designed with polymer-modified bitumen (PMB). Ten experimental designs were tested with three types of waste fibre plastics from a municipal solid waste treatment plant and two percentages of bitumen replacement (15% and 25%). The experimental testing plan included air void characterization, moisture sensitivity, stiffness and fatigue resistance, among others. An increase of approximately 5% in voids could be observed when introducing the plastic material and therefore some tests were carried out to over-compact the specimens. The results showed an improvement in the mechanical performance of the experimental mixtures, highlighting the resistance against plastic deformations, which even reached similar values to the mixtures made with PMB.
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Researchers found that incorporating plastic waste into asphalt concrete using a dry process improved selected mechanical properties including stiffness and fatigue resistance in some formulations while maintaining acceptable workability, supporting plastic waste as a viable bitumen extender for road construction.
Utilization of Plastic Waste in Concrete Pavement
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Researchers investigated the use of recycled high-density polyethylene (HDPE) plastic waste as an aggregate in concrete pavement mix designs, finding that incorporation of HDPE improved mechanical performance and durability while reducing landfill waste and energy consumption in the concrete sector.
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Researchers evaluated concrete mixes incorporating waste plastic fibres at varying proportions, finding that the addition of recycled plastic fibres meaningfully improves tensile and flexural strength, crack resistance, and ductility compared to conventional concrete while maintaining acceptable compressive performance.
A Step towards Sustainable Concrete by Replacing Plastic Waste in Concrete: A Summary of its Mechanical Properties
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This study reviewed the use of plastic waste as aggregate or fiber in cement mortar and concrete, finding that plastic fibers enhanced mechanical performance while plastic coarse aggregates impaired concrete quality due to poor bonding. The review identifies research gaps and calls for further optimization to improve plastic-based concrete performance.
Experimental Investigation on the Mechanical Properties of Concrete with Partial Replacement of Fine Aggregate by Plastic Waste
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Researchers partially replaced fine aggregate in concrete mixtures with processed PET and other waste plastic particles and found an optimal replacement level that preserved acceptable compressive and tensile strength while reducing density, beyond which plastic-to-cement bonding degraded mechanical performance, suggesting a viable route for incorporating plastic waste into lightweight non-structural construction.
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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.