1. Research Scientist, Dept. of Civil and Environmental Engineering, Laboratory for Infrastructure Science and Sustainability, Massachusetts Institute of Technology, Cambridge, MA 02139.
2. Undergraduate Researcher, Laboratory for Infrastructure Science and Sustainability, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
3. Undergraduate Researcher, Laboratory for Infrastructure Science and Sustainability, Dept. of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
4. Graduate Student, Laboratory for Multiscale Characterization and Materials Design, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
5. Assistant Professor of Civil and Environmental Engineering, Director of Laboratory for Multiscale Characterization and Materials Design, Massachusetts Institute of Technology, Cambridge, MA 02139.
6. Professor of Civil and Environmental Engineering, Director of Laboratory for Infrastructure Science and Sustainability, Massachusetts Institute of Technology, Room 1-281, 77 Massachusetts Ave., Cambridge, MA 02139-4307 (corresponding author).