1. Design Engineer, Stanley D. Lindsey and Associates, Ltd., 2300 Windy Ridge Pkwy SE, Suite 675S, Atlanta, GA 30339 (corresponding author).
2. CDM Smith Professor and Chair, Dept. of Civil and Environmental Engineering, Northeastern Univ., Boston, MA 02115.
3. Professor, Departamento de Materiales, Universidad Autónoma Metropolitana, Mexico City 02200, Mexico.
4. D.H. Burrows Professor, Via Dept. of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061.