ABSTRACT
The multiple stress creep recovery (MSCR) test is an advanced method to evaluate the high-temperature performance of asphalt, but it may have some problems in high-viscosity modified asphalt (HVA). In this paper, MSCR experiments were carried out on base asphalt, SBS-modified asphalt and three HVAs at different temperatures. The results show that HVA has better performance than traditional polymer-modified asphalt. In addition, R and Jnr at 0.1 kPa have no differentiate effect on evaluating HVA performance. Moreover, the value of Jnrdiff is much greater than 75%, which leads to the failure of the traffic grading method in the current MSCR specification, and the reason is that the value of Jnr0.1 is too small and unstable. Therefore, it is recommended to reconsider 0.1 kPa as the minimum stress in the MSCR test. Furthermore, Jnrslope with relatively stable values may be a good substitute for Jnrdiff , but its use for traffic grade classification needs to be studied.
