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Alteration of nanocrystalline calcium silicate hydrate (C-S-H) at pH 9.2 and room temperature: a combined mineralogical and chemical study

Published online by Cambridge University Press:  02 January 2018

Nicolas C. M. Marty ,
Sylvain Grangeon ,
Fabienne Warmont  and
Catherine Lerouge
Nicolas C. M. Marty*
Affiliation:
BRGM, D3E/SVP, 3 Avenue C. Guillemin, F-45060 Orléans Cedex 2, France
Sylvain Grangeon
Affiliation:
BRGM, D3E/SVP, 3 Avenue C. Guillemin, F-45060 Orléans Cedex 2, France
Fabienne Warmont
Affiliation:
ICMN (Interface, Confinement, Matériaux et Nanostructures) - UMR 7374 – CNRS - Université d’Orléans, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France
Catherine Lerouge
Affiliation:
BRGM, D3E/SVP, 3 Avenue C. Guillemin, F-45060 Orléans Cedex 2, France
*
*E-mail: n.marty@brgm.fr
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Abstract

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Calcium silicate hydrate (C-S-H) alteration was studied with flow-through experiments at 25°C and pH 9.2. Three materials with apparent Ca/Si ratios (C/S ratios) of 1.47, 1.38 and 0.86 were investigated. Physical (thermogravimetric analyses/differential thermal analysis), mineralogical (X-ray diffraction) and chemical (electron probe microanalysis, transmission electron microscopy/energy dispersive X-ray spectrometry) analyses were performed to characterize the reacting minerals. Initial stoichiometric C/S ratios were 1.22, 1.22 and 0.85, respectively. The excess of Ca is attributed mainly to the presence of calcium hydroxide intimately mixed in with C-S-H particles.

The C-S-H chemical compositions were monitored during flow-through experiments in order to determine the mineral stoichiometry needed for reaction kinetics. Under our experimental conditions the stoichiometric C/S ratios decreased continuously with time. A close to stoichiometric dissolution was observed after 2 days of experiments. Using an integrated approach, the kinetics was found to be a function of the C/S.

A decrease in layer-to-layer distance in the early stage of the alteration process is interpreted as interlayer Ca/Na exchange (Na being part of the pH buffering solution). A second dissolution step, marked by a close to stoichiometric release of Ca and Si, undoubtedly results from layer dissolution. The structural similarity of C-S-H and tobermorite was confirmed.

Keywords

calcium silicate hydrateC-S-Hdissolutionkineticsalteration product
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 2 , April 2015 , pp. 437 - 458
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2015] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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