Solidification of ion exchange resins saturated with Na+ ions: Comparison of matrices based on Portland and blast furnace slag cement

JOURNAL OF NUCLEAR MATERIALS

卷:483

Article

Lafond, E.¹  Coumes, C. Cau dit¹  Gauffinet, S.²  Chartier, D.¹  Stefan, L.⁴  Le Bescop, P.³ 

[1] CEA, DEN, DTCD, SPDE, F-30207 Bagnols Sur Ceze, France

[2] Univ Bourgogne, UMR CNRS 6303, Lab Interdisciplinaire Carnot Bourgogne, 9 Av Alain Savary,BP 47870, F-21078 Dijon, France

[3] CEA, DEN, DPC, SECR, F-91192 Gif Sur Yvette, France

[4] AREVA, Back End Business Grp, Dismantling & Serv, 1 Pl Jean Millier, Paris, France

关键词: Ion exchange resins;    Swelling;    Hydration;    Portland cement;    Blast furnace slag cement;   

DOI  :  10.1016/j.jnucmat.2016.11.003

来源: Elsevier

【 摘 要 】

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 degrees 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. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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