1. Team Leader, Advanced Materials Research Team, Material and Geotechnical Engineering Research Group, Public Works Research Institute, 1-6 Minamihara, Tsukuba, 305-8516, Japan.
2. Senior Researcher, Advanced Materials Research Team, Material and Geotechnical Engineering Research Group, Public Works Research Institute, 1-6 Minamihara, Tsukuba, 305-8516, Japan.