SURENDRA P. SHAH received his PhD from Cornell University. He ispresently Director of the NSF Science and Technology Center forAdvanced Cement-Based Materials and Walter P. Murphy Professor ofCivil Engineering at Northwestern University. STUART E. SWARTZ received his PhD in Civil Engineering at theIllinois Institute of Technology where he was a research associateand instructor. He is currently Professor and Head of CivilEngineering at Kansas State University. CHENGSHENG OUYANG received his PhD in Structural Engineering andMaterials from the University of Miami. He is currently ResearchCoordinator at the NSF Science and Technology Center for AdvancedCement-Based Materials at Northwestern University.