1. Assistant Professor, College of Civil Engineering, Hunan Univ., Lushan South Rd. 2#, Changsha 410082, P.R. China (corresponding author).
2. Graduate Research Assistant, College of Civil Engineering, Hunan Univ., Lushan South Rd. 2#, Changsha 410082, P.R. China.
3. Lecturer, Engineering Research Central of Pavement Materials, Ministry of Education, Chang’an Univ., Middle-Section of Nan’er Huan Rd., Xi’an 710064, P.R. China.