1. Ph.D. Student, School of Civil and Environmental Engineering, Oklahoma State Univ., Stillwater, OK 74075 (corresponding author).
2. Project Manager, Construction Materials Institute, Dept. of Civil Engineering, Univ. of Tehran, 14177 Tehran, Iran.
3. Professor and Director, Construction Materials Institute, Dept. of Civil Engineering, Univ. of Tehran, 14177 Tehran, Iran.