1. Associate Professor, College of Civil and Transportation Engineering, Hohai Univ., 1 Xikang Rd., Nanjing 210098, China (corresponding author).
2. Research Scientist, University of California Pavement Research Center, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.
3. Professor, School of Transportation, Southeast Univ., Nanjing 210096, China.
4. Research Scientist, College of Civil and Transportation Engineering, Hohai Univ., Nanjing 210098, China.