1. Research Assistant, Dept. of Civil, Environmental, and Geo-Engineering, Univ. of Minnesota, Minneapolis, MN 55455 (corresponding author).
2. Student, Dept. of Civil, Environmental, and Geo-Engineering, Univ. of Minnesota, Minneapolis, MN 55455.
3. Scientist, Dept. of Civil, Environmental, and Geo-Engineering, Univ. of Minnesota, Minneapolis, MN 55455.
4. Research Project Engineer, Minnesota Dept. of Transportation, MnDOT Office of Materials and Road Research, 1400 Gervais Ave., Maplewood, MN 55109.
5. Professor, Dept. of Civil, Environmental, and Geo-Engineering, Univ. of Minnesota, Minneapolis, MN 55455.