Optimizing Hot Mix Asphalt Performance With Recycled PVC from Construction Waste

Abstract Enhancing the asphalt mixture is significant for improving pavement performance and durability. This study evaluates the possibility of using recycled polyvinyl chloride (PVC) powder from construction waste (doors and windows) as a modifier for hot asphalt mixture. Different proportions of PVC powder (2.5%, 5%, 10%, 15%, and 20% by weight of the binder) were incorporated into the asphalt mixture, and the effect of the PVC powder on physical and mechanical performance characteristics was investigated through Marshall stability, flow, air voids, Marshall stiffness, Cantabro loss, and indirect tensile strength. The findings indicate that PVC content significantly affects the characteristics of the asphalt binder and the mixture. The optimum PVC concentration of 10% was identified, resulting in maximum stability of 11.6 kN and improved durability, as reflected by a reduced Cantabro loss of 12%. The modified mixtures demonstrated enhanced disintegration resistance and moisture susceptibility, recording Tensile Strength Ratio (TSR) values above 80% for PVC contents up to 10%. However, higher percentages of PVC, particularly over 15%, result in reduced stability and increased air voids. The study concludes that construction waste PVC could be used effectively at a concentration of up to 10% as a hot mixture modifier in hot climates, potentially enhancing pavement performance and addressing waste issues and challenges.