1. Research Assistant, National Engineering Laboratory of Highway Maintenance Technology, Changsha Univ. of Science and Technology, Hunan 410004, PR China.
2. Professor, National Engineering Laboratory of Highway Maintenance Technology, Changsha Univ. of Science and Technology, Hunan 410004, PR China (corresponding author).
3. Professor, National Engineering Laboratory of Highway Maintenance Technology, Changsha Univ. of Science and Technology, Hunan 410004, PR China.
4. Associate Professor, National and Regional Engineering Lab for Transportation Construction Materials, College of Civil Engineering, Chongqing Jiaotong Univ., 66 Xuefu Ave., Nanan Qu, Chongqing 400074, China.