Influence Factors and Anti-Rutting Agent of High-Temperature Stability of Asphalt Mixture

Abstract

Rutting in asphalt pavement can be influenced by many factors of high-temperature stability of mixture. Taking three continuous-graded and two gap-graded asphalt mixtures as investigation objects, Dynamic Stability (DS) and Rutting Depth (RD) were measured in cases of different temperatures, wheel rolling times and contents of a new anti-rutting agent (ARK-1) by Wheel Tracking Test. The results of testing showed that resistance to rutting of the fine aggregate mixture would be superior to that of the coarse aggregate mixture. No obvious differences between the continuous-graded and gap-graded mixtures could be observed in resistance to rutting as temperature was equal or lower than 60°C. High-temperature stability of the gap-graded or coarse aggregate mixture was better than that of the continuous-graded or fine aggregate mixture as temperature was beyond 60°C. ARK-1 could dramatically improve resistance to rutting of the asphalt mixture. A project example on Baotian freeway between stations 35+460 and 36+460 proves that the costs of pavement made with ARK-1 will be more economical than pavements with SBS-modified binder.