1. Research Associate, Louisiana Transportation Research Center, Baton Rouge, LA 70808.
2. Doctoral Student, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284.
3. Associate Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284.
4. Division of Materials and Tests, Indiana Dept. of Transportation, Indianapolis, IN 46219-038.