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Water chemical potential: A key parameter to determine the thermodynamic stability of some hydrated cement phases in concrete?

Blandine Albert 1, 2, 3 Guy Bernard 1, 2, 3 Denis Damidot 4
3 LMV-ENSMSE - Laboratoire Magmas et Volcans
CNRS - Centre National de la Recherche Scientifique : UMR6524, SPIN, Mines Saint-Étienne MSE - École des Mines de Saint-Étienne, LMV - Laboratoire Magmas et Volcans : UMR 6524
Abstract : The CaO-Al2O3-SO3-H2O system at 25 °C under 1 bar of pressure has been investigated with phase diagrams software (Zen+k) based on chemical potentials (or activities). The reported invariant points are similar to those obtained previously using equilibrium calculations. However Zen+k enables us to calculate systems at different relative humidities, and in conditions where water is not in excess, calcium monosulfoaluminate could be a stable phase and thus, as observed experimentally, remain for long times in an ordinary Portland cement paste.
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https://hal-emse.ccsd.cnrs.fr/emse-00612122
Contributor : Andrée-Aimée Toucas <>
Submitted on : Thursday, July 28, 2011 - 11:04:13 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:54 PM

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Blandine Albert, Guy Bernard, Denis Damidot. Water chemical potential: A key parameter to determine the thermodynamic stability of some hydrated cement phases in concrete?. Cement and Concrete Research, Elsevier, 2006, 30 (5), pp.783-790. ⟨10.1016/j.cemconres.2005.12.016⟩. ⟨emse-00612122⟩

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