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Formation of C-A-S-H phases from the interaction between concrete or cement and bentonite

Published online by Cambridge University Press:  02 January 2018

Raúl Fernández ,
Ana Isabel Ruiz  and
Jaime Cuevas
Raúl Fernández*
Affiliation:
Department of Geology and Geochemistry, Faculty of Sciences, Autonomous University of Madrid, Spain
Ana Isabel Ruiz
Affiliation:
Department of Geology and Geochemistry, Faculty of Sciences, Autonomous University of Madrid, Spain
Jaime Cuevas
Affiliation:
Department of Geology and Geochemistry, Faculty of Sciences, Autonomous University of Madrid, Spain
*
*E-mail: raul.fernandez@uam.es
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Abstract

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Concrete and bentonite are being considered as engineered barriers for the deep geological disposal of high-level radioactive waste in argillaceous rocks. Three hydrothermal laboratory experiments of different scalable complexity were performed to improve our knowledge of the formation of calcium aluminate silicate hydrates (C-A-S-H) at the interface between the two materials: concretebentonite transport columns, lime mortar-bentonite transport columns and a portlandite- (bentonite and montmorillonite) batch experiment. Precipitation of C-A-S-H was observed in all experiments. Acicular and fibrous morphologies with certain laminar characteristics were observed which had smaller Ca/Si and larger Al/Si ratios with increasing temperature and lack of accessory minerals. The compositional fields of these C-A-S-H phases formed in the experiments are consistent with Al/(Si+Al) ratios of 0.2– 0.3 described in the literature. The most representative calcium silicate hydrate (C-S-H) phase from the montmorillonite–cement interface is Al-tobermorite. Structural analyses revealed a potential intercalation or association of montmorillonite and C-A-S-H phases at the pore scale.

Keywords

bentoniteconcretecementC-S-HC-A-S-HX-ray diffractionSEM-EDXMAS NMR
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 2 , May 2016 , pp. 223 - 235
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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