1. Senior Researcher, Korea Institute of Construction Technology, 2311, Daehwa-Dong, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea; formerly, Graduate student, Colorado State Univ., Fort Collins, CO 80523-1372.
2. Professor, Dept. of Civil and Environmental Engineering, 1372 Campus Delivery, Colorado State Univ., Fort Collins, CO 80523-1372 (corresponding author).
3. Professor, Dept. of Chemical and Biological Engineering, 1370 Campus Delivery, Colorado State Univ., Fort Collins, CO 80523-1370.