we have a new publication from the Eichi project that is related to the Fukushima Daiichi NPP decommissioning process. This is a collaboration results with A.Prof. Taito Miura (NU), A. Prof. Go Igarashi (NU), A. Prof. Shintaro Miyamoto (Tohoku U.), Dr. Takumi Sato (JAEA), and Dr. Yuji Nagae (JAEA).
It is newly confirmed that the concrete at the bottom of the pedestal structure, a reinforced concrete member supporting the reactor vessel involved in the accident at the Fukushima Daiichi Nuclear Power Plant, has disappeared.
Last year, a robot entered the inside of the pedestal structure and took photos amid a large number of neutrons and gamma rays, and it was finally discovered. While the scenario and mechanism of the damage remain unknown, our team, led by Professor Miura, is actively investigating the effects of cooling and prolonged water exposure on concrete, keeping you at the forefront of our research.
Lime expansion is a destructive behavior that occurs when CaO comes into contact with water and becomes Ca(OH)2, but it seems that this is not the only destructive behavior. There are still many mysteries surrounding the behavior that changes in the order of minutes, but we have published the first report as a report of a little-known phenomenon.

T. Miura, S. Miyamoto, I. Maruyama, A. Aili, T. Sato, Y. Nagae, G. Igarashi, New insight on the thermal impact on cementitious materials due to high-temperature with water supply: Continuous expansive spalling in water, Case Stud. Constr. Mater. 21 (2024) e03571. https://doi.org/10.1016/j.cscm.2024.e03571.