Performance properties of devulcanized waste PET modified asphalt mixtures

The purpose of this research is to evaluate the potential incorporation of the devulcanized polyethylene terephthalate (PET) in enhancing the performance characteristics of modified asphalt mixes. To achieve this aim, seven asphalt mixtures with different percentages of devulcanized waste PET (DWP) (0, 2.5, 5, 7.5, 10, 12.5, and 15 wt% of asphalt binder) were fabricated with wet process. The physical and mechanical properties of unmodified and DWP modified mixtures were investigated using the Marshall stability, indirect tensile strength, and wheel track tests. Based on the test results the presence of PET increases Marshall stability while reduces moisture susceptibility and rutting depth of modified mixtures compared to control mixes. However, superior results obtain for mixtures modified with 7.5–10% of DWP.