1. Research Scientist, Corrosion & Sustainable Infrastructure Laboratory, Western Transportation Institute, Montana State Univ., P.O. Box 174250, Bozeman, MT 59717-4250.
2. Associate Research Professor, Civil Engineering Dept., Montana State Univ., 205 Cobleigh Hall, MT State Univ., Bozeman, MT 59717-3900; Program Manager, Corrosion & Sustainable Infrastructure Laboratory, Western Transportation Institute, Montana State Univ., P.O. Box 174250, Bozeman, MT 59717-4250 (corresponding author).