Research on the Long-term Performance of Anti-reflective Cracks of SMA

This paper is based on the Lin-Chang Expressway which is one section of Beijing-Hong Kong-Macau Expressway in China. After long-term survey since the expressway opened to traffic, the significant difference of transverse cracks between the two sections is discovered; whose surface layer is AK-16 or SMA-16 asphalt mixture. Excavation and Core-drilling Test showed that most of transverse cracks are reflective crack and the SMA section's transverse crack is much less than the AK section's, besides, the structural rutting caused by Semi-rigid base diseases is also confirmed. The Split test of AK and SMA asphalt mixture in different aging degree showed that the SMA had better Long-term Performance of Anti-reflective Crack than AK.