Comprehensive Evaluation of Temperature Sensitivity of WMA Binder with Sasobit

Abstract

Two matrix asphalt binders were selected and mixed with Sasobit in different proportion to prepare warm mix asphalt binders (WMA), and the softening point, penetration and ductility at different temperatures were measured to analyze the temperature sensitivity of Sasobit WMA. Test results indicate that with the increase of Sasobit dosages, the penetration of asphalt binder decreases, and the decreasing amplitude of penetration at higher temperature is bigger. The softening point and equivalent softening point also increase, but the ductility decreases. The temperature induction coefficient decreases, penetration index increases, and the plastic range becomes larger with the increase of Sasobit dosages, meaning the temperature sensitivity is improved. The penetration index (PI), penetration-viscosity number (PVN) and viscosity-temperature susceptibility (VTS) were analyzed, and it can be founded that the temperature susceptibility of Sasobit WMA is improved at the service stage while the temperature susceptibility of asphalt binder at high temperature turns to be more sensitive.