1. Assistant Research Scientist, Mechanical Engineering Program, Texas A&M Univ. at Qatar, P.O. Box 23874, Education City, Doha, Qatar (corresponding author).
2. Professor, Mechanical Engineering Program, Texas A&M Univ. at Qatar, P.O. Box 23874, Education City, Doha, Qatar; Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.
3. Assistant Professor, Dept. of Civil Engineering, Univ. of Idaho, Moscow, ID 83844.
4. Professor, Faculty of Civil Engineering and Geosciences, Section of Pavement Engineering, Delft Univ. of Technology, Stevinweg 1, 2628 CN, Delft, Netherlands.