1. Research Scholar, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706; Associate Professor, Dept. of Civil Engineering, Faculty of Civil Engineering and Mechanics, Jiangsu Univ., Zhenjiang 212013, China.
2. Research Scientist, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706 (corresponding author).
3. Professor and Chair, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706.
4. Professor Emeritus and Director, Recycled Materials Resource Center, Univ. of Wisconsin-Madison, Madison, WI 53706.