Effect of Chloride and Sulfate in the Immobilization of Cs-137 in C-S-H Gel
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- Duque-Redondo Eduardo
- Department of Physical Chemistry, University of the Basque Country UPV/EHU, Aptdo. 664, 48080, Bilbao, Spain.
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- Yamada Kazuo
- Fukushima Branch, National Institute for Environmental Studies, Miharu, Tamura, Fukushima, 963-7700, Japan.
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- Manzano Hegoi
- Department of Physics, University of the Basque Country UPV/EHU, Aptdo. 664, Bilbao, Spain.
抄録
<p>Cementitious materials are commonly used in nuclear repository sites to immobilize intermediate-level radioactive wastes. This is due to the large surface area of the calcium silicate hydrate (C-S-H) gel, the main hydration product of ordinary Portland cement, which provides many sorption sites in which the contaminants can be adsorbed. The retention capacity of these materials is strongly dependent on the composition, the water content, the pH or the presence of additives. Likewise, it is also known that the durability and performance of cement and concrete are adversely affected in chloride and/or sulfate environments. In this work, atomistic simulations have been employed to analyze the effect of the presence of chlorides and sulfates in the retention and transport of 137Cs, one of the most hazardous radioisotopes, in calcium silicate hydrate. The simulations suggest that the presence of a moderate amount of chlorides does not alter significantly the Cs uptake in C-S-H gel, while a moderate content of sulfates enhances substantially the retention of Cs ions and reduces their migration throughout the pore. This behavior is attributed to the ability of the sulfates to pull Ca out the high-affinity sites from the C-S-H surface, allowing Cs ions to occupy them.</p>
収録刊行物
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- Journal of Advanced Concrete Technology
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Journal of Advanced Concrete Technology 19 (1), 95-105, 2021-01-27
公益社団法人 日本コンクリート工学会
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詳細情報 詳細情報について
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- CRID
- 1391412881285760128
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- NII論文ID
- 130007975733
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- ISSN
- 13473913
- 13468014
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可