1. Hiroshima University, Civil and Environmental Engineering Program, 1-4-1 Kagamiyama, Higashi-Hiroshima-shi, Hiroshima 739-8527, Japan.
2. Gunma University, Department of Civil and Environmental Engineering, 1-5-1 Tenjin, Kiryu, Gunma, 376-8515, Japan.
3. Global Material Research Corporation, 2-15-8 Ichikawa, Chiba, 272-0034 Japan.
4. Paul Scherrer Institute, Laboratory for Waste Management, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland.