1. Graduate Research Assistant, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77845.
2. E. B. Snead I Associate Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77845 (corresponding author).
3. Assistant Professor, Dept. of Civil Engineering, Middle East Technical Univ., Ankara, Turkey.
4. Group Leader, Inorganic Materials Group, National Institute of Standards and Technology, Gaithersburg, MD 20899-8615.