Laboratory Evaluation of Domestic Waste Plastic on Performance of Asphalt Binder and Mixture
Author
Department of Land Use Planning and Assessment, Science and Research Branch, Islamic Azad University, Tehran, Iran
Abstract
Commercial polymers for pavement modification have been around for decades. However, one of the main weaknesses of these polymers is their high cost. Waste plastic polymers can be used as a sustainable and economically efficient additive to improve the properties of asphalt and obtain environmentally friendly and economical compounds. This study was conducted with the aim of investigating and evaluating the effect of using plastic waste, polyethylene terephthalate 1 (PET), in bitumen modification. The percent modified with PET was carried out in two separate steps in the laboratory environment: modified bitumen additive and modified asphalt mixture. To investigate the functional characteristics and viscoelastic behavior of bitumen modified with plastic, the DSR 2 device and the RTFOT 3 test are used. For the functional performance of asphalt mixture modified with plastic, Marshall Strength test, Marshall fluidity, Marshall strength ratio and rutting test have been performed. The results showed that 6-8% of modified plastic is suitable as the optimal amount to improve the stiffness and elasticity of bitumen. In addition, the modified asphalt mixture with 8% plastic showed an increase in flexural strength and had a greater effect with increasing Marshall Strength, increasing Marshall Ratio and reducing rutting.
Keywords
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