1. a State Key Laboratory of Power Transmission Equipment and System Security, Department of High Voltage and Insulation Engineering , College of Electrical Engineering, Chongqing University , Chongqing 400044 , China
2. b Corrosion and Sustainable Infrastructure Laboratory , Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University , Bozeman , MT 59717-4250 , USA
3. c Civil Engineering Department, 205 Cobleigh Hall , Montana State University , Bozeman , MT 59717-2220 , USA