1. Assistance Professor, Dept. of Civil and Construction Engineering, Iowa State Univ., Ames, IA 50011. E-mail: kejinw@iastate.edu
2. Principal Process Engineer, Construction Technology Laboratories, Skokie, IL 60077. E-mail: amishulovich@CTLgroup.com
3. Professor, Dept. of Civil and Environmental Engineering, Northwestern Univ., Evanston, IL 60208. E-mail: shah@northwestern.edu