1. Ph.D. Candidate and Research Assistant, Dept. of Civil and Environmental Engineering, Washington State Univ., Spokane St., Sloan Hall 37, Pullman, WA 99164-2910. E-mail: shenghua.wu@wsu.edu
2. Research Assistant, Dept. of Civil and Environmental Engineering, Washington State Univ., Spokane St., Sloan Hall 37, Pullman, WA 99164-2910. E-mail: kun.zhang2@email.wsu.edu
3. Associate Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., P.O. Box 642910, Spokane St., Sloan Hall 41, Pullman, WA 99164-2910 (corresponding author). E-mail: haifang_wen@wsu.edu
4. Bituminous Engineer, Washington Dept. of Transportation, 1655 S. 2nd Ave., Tumwater, WA 98512. E-mail: DeVolJ@wsdot.wa.gov
5. Geotechnical Engineer, Dept. of King County Road Service, 155 Monroe Ave. NE, Bldg. D, Renton, WA 98056.