Effects of Surfactant Warm‐Mix Additives on the Rheological Properties of High‐Viscosity Asphalt
Jingtao Shi, Weiyu Fan, Yi Lin, Pinhui Zhao, Jian Ouyang
Abstract
In order to evaluate the possibility of the application of warm mixing technology in high‐viscosity asphalt mixture, in this paper, the effects of surfactant warm‐mix additives (WMAs) on physical and rheological properties of high‐viscosity asphalt (HVA) which was prepared with self‐developed SBS/C 9 petroleum resin blends (SPR) modifier were measured. The results indicate that the addition of WMA can decrease the viscosity and softening point but improve the penetration and ductility of warm‐mix HVA. With the increase of the content of WMA, the modulus, failure temperature, viscosity, and recovery rate of warm‐mix HVA all increased at first and then decreased, and the maximum value appeared when the modifier content was 1.0%–1.5%. Moreover, when the amount of WMA is 1.5%, the low‐temperature performance of warm‐mix HVA reaches the best value. Thus, the amount of WMA is of great importance for the warm‐mix HVA, and in order to achieve ideal rheological properties, the recommended amount of WMA is 1.0%–1.5%. Considering economic improvement and environmental protection, WMA could be an alternative for increasing the workability of HVA.