Investigation on high-temperature performance of waste-based high-viscosity asphalt binders (WHABs) by repeated creep recovery (RCR) test

摘要

This study reviewed and compared the test methods for the high-temperature performance of asphalt binder, and selected repeated creep recovery (RCR) test to evaluate the high-temperature performance of three waste-based high-viscosity asphalt binders (WHABs, including D-I, D-II, and F) and a control sample (Tafpack-Super modified asphalt, TMA). Meanwhile, shear stress, test temperature, and aging degree of binders, which could influence high-temperature behavior of binders, were also investigated, and related evaluation indexes including recovery compliance (R), non-recoverable creep compliance (J(nr)), and viscous stiffness modulus (G(v)) were compared. Results show that WHABs has much better high-temperature performance than TMA; shear stress has the most prominent effect on binders' high-temperature performance, followed by aging degree, and lastly the selected test temperature in gamma-time curve results; R, J(nr), and G(v) values results indicate aging degree has a significant effect on binders, and improving binders' aging performance can greatly improve the high-temperature performance.