1. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ./Southern Univ., 3418F CEBA, Louisiana State Univ., Baton Rouge, LA 70803.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana Tech Univ., Ruston, LA 71272,
3. Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.
4. Materials Research Administer, Louisiana Transportation Research Center, Baton Rouge, LA 70803.