Authors: Berger, S.¹; Frizon, F.²; Joussot-Dubien, C.¹

Source: Advances in Applied Ceramics, Volume 108, Number 7, October 2009 , pp. 412-417(6)

Publisher: Maney Publishing

Abstract:

Cement encapsulation is widely used as a low- and intermediate level radioactive waste immobilisation process. Among these wastes, caesium ions are poorly immobilised by Portland cement based materials. This work consists of an experimental investigation into the ability of geopolymers to effectively encapsulate this chemical species and to determine the impact of caesium incorporation on the geopolymer properties. Geopolymers were synthesised with several compositions based on the activation of metakaolin with an alkali hydroxide solution containing caesium. The setting time, mineralogy, porosity and mechanical properties of the samples were examined for one month. Leach tests were conducted during the same period to determine the immobilisation efficiency. The results depend to a large extent on the composition of the activation solution in terms of soluble silica content and alkali used. These parameters determine both the degree of condensation and the geopolymer composition.

Keywords: MICROSTRUCTURE; CAESIUM; GEOPOLYMER; WASTE; FORMULATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174367609X422072

Affiliations: 1: CEA, DEN, Decontamination and Conditioning Department, DEN/DTCD/SPDE/L2ED, F-30207 Bagnols-sur-Cèze Cedex, France 2: CEA, DEN, Decontamination and Conditioning Department, DEN/DTCD/SPDE/L2ED, F-30207 Bagnols-sur-Cèze Cedex, France;, Email: fabien.frizon@cea.fr

Publication date: 2009-10-01

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