Encapsulation of caesium-loaded Ionsiv in cement

Jenni, Andreas; Hyatt, N. C. (2010). Encapsulation of caesium-loaded Ionsiv in cement. Cement and concrete research, 40(8), pp. 1271-1277. Elsevier 10.1016/j.cemconres.2009.10.015

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The microporous material Ionsiv is used for 137Cs removal from aqueous nuclear waste streams. In the UK, Cs-loaded Ionsiv is classed as an intermediate-level waste; no sentencing and disposal route is yet defined for this material and it is currently held in safe interim storage on several nuclear sites. In this study, the suitability of fly ash and blast furnace slag blended cements for encapsulation of Cs-Ionsiv in a monolithic wasteform was investigated. No evidence of reaction or dissolution of the Cs-Ionsiv in the cementitious environment was found by scanning electron microscopy and X-ray diffraction. However, a small fraction (<= 1.6 wt.%) of the Cs inventory was released from the encapsulated Ionsiv during leaching experiments carried out on hydrated samples. Furthermore, it was evident that K and Na present in the cementitious pore water exchanged with Cs and H in the Ionsiv. Therefore, cement systems lower in K and Na, such as slag based cements, showed lower Cs release than the fly ash based cements.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Rock-Water Interaction

UniBE Contributor:

Jenni, Andreas

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0008-8846

Publisher:

Elsevier

Language:

English

Submitter:

Andreas Jenni

Date Deposited:

20 Oct 2015 14:45

Last Modified:

25 Jul 2016 14:50

Publisher DOI:

10.1016/j.cemconres.2009.10.015

Uncontrolled Keywords:

Radioactive waste (E), Leaching, Composite (E), Blended cement (D), Diffusion (C),

BORIS DOI:

10.7892/boris.72225

URI:

https://boris.unibe.ch/id/eprint/72225

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