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Comparison of Concrete Properties Utilizing Expanded Polysterene beads and Shredded PET Bottle Particles as Fine Aggregate Replacement
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Researchers tested concrete made with recycled plastic (expanded polystyrene beads and shredded PET bottle particles) replacing some sand. As more plastic was added, the concrete got weaker and lighter, but resisted water absorption better. Only one mix, with 5% burnt PET, met the strength standard for structural lightweight concrete.
There is a growing concern for proper disposal of waste products. Polyethylene Terephthalate (PET) is common waste product. There has been the need for innovative strategies for valorisation within the construction industry. Every year, over 460 million metric tonnes of plastic is produced globally, the rate of recycling is less than 10 percent. This leaves more than 90 percent of the plastic as wastes and some of them end up as landfills. By incorporating polymer wastes as concrete aggregates, a compelling circular economy pathway is created. In this research, the properties of concrete containing Expanded Polystyrene beads and burnt PET particles was nvestigated. at levels of 5%, 10%, 15%, and 20% by volume under two mix ratios (1:2:4 and 1:3:6). A total of 54 concrete cubes (150 × 150 × 150 mm) were cast and cured for 28 days at a water/cement ratio of 0.65. The properties of concrete such as workability (slump), compressive strength, hardened density, and water absorption were evaluated. The results showed that as the replacement percentages were increased, the compressive strength and hardened density relative to control mixes reduced. Although the resistance to water absorption improved with increased PET percentage. The 1:2:4 mix with 5% burnt PET replacement achieved a compressive strength of 18.79 MPa which was the only combination that satisfied the 17 MPa structural lightweight concrete threshold. These findings support low-percentage burnt PET substitution as a viable approach to producing structural lightweight concrete aligned with circular economy objectives.
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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.
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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.
Mechanical, Thermal, and Non-Destructive Evaluation of Concrete Incorporating Recycled PET Bottle Aggregates
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Researchers incorporated recycled PET bottle aggregates into concrete at up to 30% replacement of natural aggregate, finding that 10% fine PET slightly improves compressive strength while higher substitutions reduce strength by up to 31%, though thermal conductivity drops by up to 42%, making PET-based concrete promising for lightweight insulating applications.
Mechanical properties studying in concrete through PET plastic and rubber waste integration in mixture
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Researchers incorporated recycled PET plastic and rubber tire waste as partial replacements for fine and coarse aggregates in concrete mixes at substitution rates up to 60%, finding that while compressive strength and density declined with higher replacement ratios, the resulting lightweight concrete could reduce structural dead loads and offers a viable outlet for polymeric waste in non-load-bearing applications.
Experimental investigation on mechanical and durability properties of M30 concrete with HDPE plastic waste as partial coarse aggregate replacement
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