Penetration of Cs and Sr into cracked dry carbonated mortar considering the contamination history of Fukushima Daiichi NPP

福島第一原子力発電所の汚染履歴を考慮したCsとSrのひび割れた乾燥炭酸化モルタルへの浸透実験

山田 一夫*; 東條 安匡*; 粟飯原 はるか   ; 富田 さゆり*; 洞 秀幸*; 渋谷 和俊*; 駒 義和  ; 五十嵐 豪*; 細川 佳史*; 丸山 一平*

Yamada, Kazuo*; Tojo, Yasumasa*; Aihara, Haruka; Tomita, Sayuri*; Hokora, Hideyuki*; Shibuya, Kazutoshi*; Koma, Yoshikazu; Igarashi, Go*; Hosokawa, Yoshifumi*; Maruyama, Ippei*

Experiments were conducted on mortar made from aggregates used in the Fukushima Daiichi NPP, which were dry carbonated and further cracks were introduced to reproduce the contamination history of the lower part of the turbine pit. The concrete was exposed to contaminated water after being in contact with seawater for one day due to the post-earthquake tsunami; Cs and Sr interacted differently with the constituent materials of the concrete and competitively adsorbed with ions in the seawater. The effects of various factors were quantitatively evaluated by experiment. Dry carbonation conditions enhanced infiltration but had a limited effect on cracking.