1. Professor, School of Highway Engineering, Changsha Univ. of Science and Technology, Chiling Road 45#, Changsha, Hunan P.R. China 410076; and, Pavement Engineering Supervisor, Texas Dept. of Transportation, 4203 Bull Creek #39, Austin, TX 78731 (corresponding author). E-mail: dchen@dot.state.tx.us
2. Professor, Dept. of Civil Engineering, Univ. of Texas at El Paso, 500 West University Ave., El Paso, TX 79968. E-mail: nazarian@utep.edu
3. Transportation Engineer, Material and Pavements Section, Texas Dept. of Transportation, 4203 Bull Creek Rd., Austin, TX 78731. E-mail: jbilyeu@dot.state.tx.us