The rapid increase in plastic waste and deterioration of road infrastructure has become a major concern in developing countries like India. This study evaluates the performance of plastic waste modified bituminous concrete using the Marshall Stability method. Shredded plastic (LDPE and PP) was incorporated using the dry process in varying percentages (0%, 5%, 8.5%, and 12% by weight of bitumen). Marshall Stability tests were conducted to determine the optimum plastic content and evaluate the engineering properties of the mix. Laboratory results indicate that an optimum plastic content (OPC) of 8.5% significantly improves Marshall Stability by approximately 40%, enhances Marshall Quotient, and reduces air voids. Volumetric analysis such as VMA, VFB and bulk density were also evaluated. The study further includes an economic and environmental analysis, demonstrating that plastic modified bituminous mix is a sustainable, durable, and cost-effective solution for flexible pavements.
Sanjay Singh , Yashpratap Singh Chauhan , Saurabh Thakur , Ravindra Singh Sisodiya , Lokendra Hingwe , Dr. Rakesh Patel (2026) studied this question.