Suitability of Plastic Modified Asphalt Concrete (PMAC) in Sri Lankan Context

This research paper explores the suitability of utilizing non-recyclable waste plastics, specifically Low-Density Polyethylene (LDPE) and Biaxially Oriented Polypropylene (BOPP), to modify asphalt concrete (AC) within the Sri Lankan setting. With the escalating environmental burden posed by non-recyclable plastic waste, this study investigates the potential of incorporating LDPE and BOPP into AC mixes, aiming to address both waste management issues and pavement performance enhancement. By analyzing the parameters of the PMAC, it revealed that all the properties have been increased compared to the conventional AC. Similarly, some of the performance indicators of the road surface such as macrotexture depth, and also skid resistance have been complying with the specification requirement. Based on the existing literature, the durability of PMAC roads has been ensured, and this study seeks to confirm the durability through comprehensive testing. Moreover, the production process for PMAC, along with the subsequent road pavement steps, closely resembles that of conventional Asphalt Concrete (AC). Test results have proven that the emissions incorporated with PMAC are no different than the conventional AC. Additionally, measures have been implemented to regulate the sizes of plastic particles, thereby mitigating the occurrence of microplastics. This guarantees PMAC as an ecologically sustainable substitute for conventional AC. PMAC reduces the bitumen content compared to conventional AC saving foreign currency. The outcomes of this research hold significant implications for both waste management strategies and the improvement of conventional AC in Sri Lanka. By incorporating non-recyclable waste plastics as a raw material, the study offers practical recommendations for sustainable road construction. In conclusion, this paper contributes to the discourse on the suitability of PMAC in the Sri Lankan context, emphasizing its potential to simultaneously address non-recyclable plastic waste challenges and enhance road pavement performance. The research outcomes have the potential to guide future road construction endeavors in a more environmentally conscious and effective manner.