1. Professor, Dept. of Urban and Civil Engineering, Ibaraki Univ., Hitachi, Ibaraki 316-8511, Japan.
2. Associate Professor, Dept. of Civil Engineering, McGill Univ., Montreal, Quebec H3A 2K6, Canada.
3. SVBL Research Fellow, Dept. of Urban and Civil Engineering, Ibaraki Univ., Hitachi, Ibaraki 316-8511, Japan.
4. Nittetsu Corrosion Prevention Co. Ltd., Kimitsu, Chiba 299-1141, Japan.