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Water chemical potential: A key parameter to determine the thermodynamic stability of some hydrated cement phases in concrete? |
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| Authors: | Blandine Albert Denis Damidot |
| Affiliation: | a Department of Geotechnic and Material, Scetauroute - Egis group, Seyssins, 38180, France b Department of Geochemistry, SPIN Division and UMR CNRS no. 6524, Ecole Nationale Supérieure des Mines de Saint-Etienne, France c Civil Engineering Department, Ecole des Mines de Douai, Douai, France |
| 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. |
| Keywords: | Ettringite Calcium monosulfoaluminate Phase diagram Invariant points Chemical potential Activity Relative humidity |
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