1. Bridge Engineer, Bridge Dept., HNTB Corporation, 10000 Perkins Rowe Suite#640, Baton Rouge, LA 70810 (corresponding author).
2. Ph.D. Student, Dept. of Civil and Environmental Engineering, Michigan State Univ., 3546 Engineering Building, E. Lansing, MI 48824-1226.
3. Max T. Rogers NMR Facility, Michigan State Univ., 578 S. Shaw Ln. Room 27, East Lansing, MI 48824-1226.
4. Senior Scientist, Metna Co., 1926 Turner St., Lansing, MI 48906.
5. Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., 3546 Engineering Building, E. Lansing, MI 48824-1226.