UTILIZATION OF RECYCLED PLASTIC AND NATURAL RUBBER IN ASPHALT CONCRETE TO IMPROVE PERFORMANCE OF FLEXIBLE PAVEMENT: LABORATORY INVESTIGATION
Keywords:
Asphalt, recycled plastic, natural rubber, modified asphalt concrete, Marshall methodAbstract
The purpose of this study is to investigate the feasibility of using recycled low density polyethylene (LDPE) plastic and natural rubber (NR) as a polymer additive in asphaltic concrete pavement. In this work, 60/70 penetration grade asphalt cement (AC) was modified by varying the percentage of NR of 2, 3, and 4% by mass of AC based on the wet process, while the aggregate was blended with LDPE at the same content as the NRfollowing the dry process and then mixed together. The polymer modified asphalt concrete(PMAC) specimens were prepared based on the Marshall mixed design procedure,designed for the binder coarse layer. The result showed that the PMAC, by adding 2.5%LDPE and 2.5% NR by mass of optimum binder content (4.90%), can enhance both the volumetric and mechanical properties of the mixture with better durability, rutting resistance, and stiffness than conventional asphalt concrete.
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