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Thermodynamic properties of C-S-H, C-A-S-H and M-S-H phases: Results from direct measurements and predictive modelling

Abstract : How cement-based materials behave in storage operating conditions is important in the context of a radwaste deep geological repository. In particular, we need missing thermodynamic data for ternary and low-pH cementitious materials that have high aluminum oxide content. This work reports calorimetric measurements performed on calcium silicate hydrate (C-S-H), calcium aluminate silicate hydrate (C-A-S-H) and magnesium silicate hydrate (M-S-H) gel phases. Coupled with solubility experiments and vapor adsorption isotherms, a complete set of thermodynamic parameters for C-S-H, C-A-S-H, and M-S-H is provided. The measurements are complemented by a model predicting thermodynamic properties, which is parameterized using results from this work. Predominance diagrams allow us to confirm the relation between M-S-H and low C/S phases. The diagrams support a discussion on kinetics that may play a role in relations with other Al-and Mg-bearing phases.
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https://hal.archives-ouvertes.fr/hal-01898399
Contributor : Dominique Massiot Connect in order to contact the contributor
Submitted on : Thursday, October 18, 2018 - 1:42:15 PM
Last modification on : Sunday, June 26, 2022 - 10:12:11 AM

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Cédric Roosz, Philippe Vieillard, Philippe Blanc, Stéphane Gaboreau, Hélène Gailhanou, et al.. Thermodynamic properties of C-S-H, C-A-S-H and M-S-H phases: Results from direct measurements and predictive modelling. Applied Geochemistry, Elsevier, 2018, 92, pp.140 - 156. ⟨10.1016/j.apgeochem.2018.03.004⟩. ⟨hal-01898399⟩

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