1. Assistant Research Engineer, Materials and Pavement Division, Texas Transportation Institute, The Texas A&M Univ. System, 3135 TAMU, College Station, TX 77840-3135 (corresponding author).
2. Research Associate, Materials and Pavement Division, Texas Transportation Institute, The Texas A&M Univ. System, 3135 TAMU, College Station, TX 77840-3135.
3. Senior Research Engineer, Materials and Pavement Division, Texas Transportation Institute, The Texas A&M Univ. System, 3135 TAMU, College Station, TX 77840-3135.
4. Pavement and Materials Systems Branch Manager, Construction Division, Texas Dept. of Transportation, Austin, TX 78763.