1. a Department of Civil and Environmental Engineering , Washington State University , Pullman, WA, 99164-2910, USA
2. b Office of Pavement Technology , Federal Highway Administration , 400, 7th Street, Room 6319, Southwest, Washington DC, 20590, USA
3. c Turner-Fairbank Highway Research Center , Federal Highway Administration , 6300 Georgetown Pike,HRDI, McLean, VA, 22101-2296, USA