Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5454294 | Journal of Nuclear Materials | 2017 | 11 Pages |
Abstract
This work is devoted to the conditioning of ion exchange resins used to decontaminate radioactive effluents. Calcium silicate cements may have a good potential to encapsulate spent resins. However, certain combinations of cement and resins produce a strong expansion of the final product, possibly leading to its full disintegration. The focus is placed on the understanding of the behaviour of cationic resins in the Na+ form in Portland or blast furnace slag (CEM III/C) cement pastes. During hydration of the Portland cement paste, the pore solution exhibits a decrease in its osmotic pressure, which causes a transient expansion of small magnitude of the resins. At 20 °C, this expansion takes place just after setting in a poorly consolidated material and is sufficient to induce cracks. In the CEM III/C paste, swelling of the resins also occurs, but before the end of setting, and induces limited stress in the matrix which is still plastic.
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Nuclear Energy and Engineering
Authors
E. Lafond, C. Cau dit Coumes, S. Gauffinet, D. Chartier, L. Stefan, P. Le Bescop,