1. Department of Civil & Environmental Engineering, Michigan State University, E. Lansing, MI 48824
2. Department of Chemical Engineering & Materials Science, Michigan State University, E. Lansing, MI 48824
3. Department of Civil Engineering, McMaster University, Hamilton, ON L8S 4L7. Phone: (905) 525-9140 ext. 24131. Fax: (905) 540-1159. E-mail: address: mastens@mcmaster.ca