Fatigue Performance of Long - Term Aged Plastic Granule Modi?ed Bitumen Containing Chemical Additives

Recently warm mix asphalt (WMA) technologies have been introduced to rubberized asphalt mixtures to decrease the required construction temperatures and alleviate hazardous gas emissions. Molten plastic asphalt pavements combining with WMA have the potential to improve long - term pavement performance. This study aims to investigate the fatigue performance of modi?ed bitumen with molten plastic (MP) containing warm - mix additives using different characterization methods. The effects of molten plastic modi?er (MP) content (5%, 10%, 15%, and 20% by weight of base bitumen) and warm - mix additives on the binder fatigue performance were investigated. Various laboratory tests, including frequency sweep tests, time sweep (TS) tests and linear amplitude sweep (LAS) tests, were conducted on the long - term aged binders to obtain indicators of fatigue performance. Results show that there is a good correlation between the measured fatigue life determined by TS tests using the dissipated energy concept and the predicted fatigue life determined by LAS tests using the simpli?ed viscoelastic continuum damage (S - VECD) theory. However, the traditional Superpave fatigue parameter and the G - R parameter cannot characterize accurate enough the fatigue performance of modi?ed binders. Modified binders exhibit superior fatigue performance compared to the neat bitumen. The effects of warm - mix additives on the fatigue performance are different for neat bitumen compared to modify binder. Based on the ?ndings in this study, rubberized asphalt mixture combining with WMA additives is expected to have a promising long - term fatigue performance.