Several studies focus on recovering plastic waste for use in road construction rather than banning it or using environmentally harmful methods such as incineration or landfills. Moreover, the intensity of road traffic is increasing today.
Using plastic waste as an additive in road projects would overcome the ecological crisis and improve its properties because of its availability, lightness, and flexibility advantages.
This study aims to assess the performance of bituminous concrete with the addition of PET plastic waste by dry process. The optimum bitumen content used in the bituminous mixture was replaced by 3, 5, and 7% content to prepare modified asphalt mixes. The results of the Marshall test, creep-recovery test, rutting test, the Retained Strength Test, and the leaching test of the PET-modified asphalt mix were evaluated and compared to the control asphalt mix (without PET). The results concluded that adding 5% of this coarse and fine polymer to mixtures helps to increase the rutting resistance by 34% and 26%, respectively, and the Marshall quotient by 95% and 81%. It also reduces deformation by creep recovery by 25% and 20% compared to the control asphalt mixtures. It provides excellent behavior in the presence of water, where the water resistance