1. Research Assistant, Dept. of Civil and Environmental Engineering, Michigan Technological Univ., Houghton, MI 49931.
2. Research Assistant Professor, Dept. of Mechanical Engineering-Engineering Mechanics, and Dept. of Civil and Environmental Engineering, Michigan Technological Univ., Houghton, MI 49931.
3. Donald and Rose Ann Tomasini Assistant Professor, Dept. of Civil and Environmental Engineering and Director of Transportation Materials Research Center of Excellence, Michigan Technological Univ., Houghton, MI 49931.