1. Senior Researcher, Dept. of Pavement, Korea Expressway Corporation Research Institute, 208-96, Dongbu-daero 922 beon-gil, Dongtan-myeon, Hwaseong-si, Gyeonggi-do 18492, Republic of Korea.
2. Lecturer, College of Transport and Communications, Shanghai Maritime Univ., 1550 Haigang Ave., Shanghai 201306, P.R. China.
3. Professor, Dept. of Civil and Environmental Engineering, Chung-Ang Univ., 84 Heukseok-Ro, Dongjak-Gu, Seoul 06974, Republic of Korea (corresponding author).