1. Associate Professor, Key Laboratory of Road Structure and Material, Research Institute of Highway, Ministry of Transport, Beijing 100088, China.
2. Professor, Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji Univ., Shanghai 201804, China; and Research Scientist, Dept. Civil and Environmental Engineering, University of California Pavement Research Center, Univ. of California Davis, 1 Shields Ave., Davis, CA 95616 (corresponding author).