1. Diplom-Ingenieur, Research Associate, Center for Advanced Cement-Based Materials, Northwestern Univ., 2145 Sheridan Rd., Evanston, IL 60208 (corresponding author).
2. PhD, Research Associate, Center for Advanced Cement-Based Materials, Northwestern Univ., 2145 Sheridan Rd., Evanston, IL 60208; also at Istanbul Technical Univ., Civil Engineering Faculty, Maslak, 80626 Istanbul, Turkey.
3. Professor for Civil Engineering, Director of Center for Advanced Cement-Based Materials, Northwestern Univ., 2145 Sheridan Rd., Evanston, IL 60208.