1. Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510, Chiba, Japan
2. Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510, Chiba, Japan
3. Department of Fire Engineering, Building Research Institute, 1 Tachihara, Tsukuba 305-0802, Ibaraki, Japan
4. Building Department, National Institute for Land and Infrastructure Management, 1 Tachihara, Tsukuba 305-0802, Ibaraki, Japan
5. Materials Sciences Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Naka 319-1195, Ibaraki, Japan