article · Advances in Materials Science and Engineering
Using recycled waste in road pavement provides environmental benefits while enhancing road service performance. This research evaluates the mechanical properties of hot mix asphalt modified with crumb rubber and polyethylene terephthalate plastic polymer. Laboratory tests on the binder and mix revealed that an optimal blend combines 10% crumb rubber chips with 2% polyethylene terephthalate by weight. Adding 10% crumb rubber decreased binder penetration by 1.56% and raised the softening point by 4.33%. Furthermore, the combined optimum mixture increased Marshall stability by 0.17%, decreased flow by 20.07%, and improved stiffness by 20.71%. The additives also improved tensile strength, with the combined formulation performing better than using either material separately.
Repurposing tyre rubber and plastic polymer waste into road pavements helps address critical environmental waste problems. Demonstrating that these combined recycled materials increase asphalt stiffness and improve tensile strength offers road builders a practical pathway to construct more durable road surfaces while supporting circular economy initiatives in infrastructure development.
This research is relevant to asphalt manufacturers, road construction contractors, and civil transport authorities seeking sustainable pavement modifiers. The work is at an applied laboratory testing stage, having defined optimal proportions and mechanical performance metrics. Real-world commercialisation will depend on larger-scale trials and industrial mixing validation.
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Nowadays, the use of recycled waste materials in road pavement is regarded not only as a positive option in terms of sustainability but also as an appealing option in terms of providing improved service performance. The current study aimed at evaluating the performance of crumb rubber and polyethylene terephthalate plastic polymer in asphalt mixture in modifying the mechanical properties of asphalt pavement. Experimental tests were carried out both for asphalt binder and asphalt mixture. Different proportions of mix for crumb rubber and polyethylene terephthalate plastic polymer were used to systematically investigate the effect of mix ratio on performance of the asphalt material. The experimental analysis reveals that the combined application of 10% by weight of crumb rubber chips and 2% polyethylene terephthalate plastic polymer are the ideal mix ratios found effective in modifying properties of the asphalt mixture. The asphalt binder test results indicate that adding 10% crumb rubber to asphalt binder reduced penetration by 1.56% along with increment of the softening point by 4.33%. Furthermore, the indicated optimum mix amount resulted in 0.17% rise, 20.07% drop, and 20.71% increase in Marshal stability, flow, and stiffness, respectively. Besides, tensile strength of the asphalt mixture was enhanced with addition of the filler and binder materials. It was witnessed that the combined application of the additives performs better than their separate use in modifying properties of the asphalt mix.
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DOI: 10.1155/2023/6320490
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