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コンクリート構造材へのセシウム浸透挙動評価

Evaluation of cesium penetration behavior in concrete structural materials

腰越 広輝*; 佐藤 勇*; 宮原 直哉*; 鈴木 恵理子   ; 逢坂 正彦  ; 松浦 治明*

Koshigoe, Koki*; Sato, Isamu*; Miyahara, Naoya*; Suzuki, Eriko; Osaka, Masahiko; Matsuura, Haruaki*

福島第一原子力発電所の廃炉に必要なコンクリートへのセシウム(Cs)浸透挙動を解明するため、CsCl及びCsI水溶液のコンクリートへの浸透試験を行った。蛍光X線分析によりCs浸透深さ分布を、広域X線吸収微細構造によりコンクリート中のCsの化学状態を調べた結果、コンクリートの粗骨材含有率で浸透深さは変化しないものの、化学状態が変化することが分かった。

To elucidate cesium (Cs) penetration behaviour in concrete structural materials under Fukushima Daiichi Nuclear Power Station accident condition, penetration tests of CsCl and CsI into concrete were performed. The depth profile and chemical state of Cs in penetrated concrete were investigated by using XRF and EXAFS. As a result, it was found that the chemical state of Cs could be affected by volume ratio of coarse aggregates, whereas the depth profile of Cs could not be affected.

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