1. Assistant Professor, College of Civil Engineering, Hunan Univ., Changsha 410082, China; Visiting Scholar, Center for Advanced Cement-Based Materials, Northwestern Univ., Evanston, IL 60208.
2. Professor, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, P.R. China (corresponding author).
3. Ph.D. Candidate, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, P.R. China.
4. Professor, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, P.R. China.
5. Associate Professor, Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia.
6. Walter P. Murphy Professor, Center for Advanced Cement-Based Materials, Northwestern Univ., Evanston, IL 60208.