1. Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave., West Waterloo, ON, Canada N2L 3G1.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave., West Waterloo, ON, Canada N2L 3G1 (corresponding author).
3. Professor, Dept. of Chemical Engineering and Institute for Polymer Research, Univ. of Waterloo, 200 University Ave., West Waterloo, ON, Canada N2L 3G1.