Early C3A hydration in the presence of different kinds of calcium sulfate. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Cement and Concrete Research Année : 2009

Early C3A hydration in the presence of different kinds of calcium sulfate.

Résumé

Hydration reactions of C3A with various amounts of calcium sulfate hemihydrate, gypsum or a mixture of two, were investigated by isothermal microcalorimetry, and a monitoring of the ionic concentrations of diluted suspensions. This study shows that sulfate type used modifies the early C3A-CaSO4 hydration products and the rate of this hydration. The fast initial AFm formation observed before ettringite precipitation in the C3A-gypsum system is avoided as soon as hemihydrate is present in the suspension. This was attributed to.higher super saturation degrees and then higher nucleation frequency with regard to the ettringite obtained in the presence of hemihydrate. Moreover, replacement of gypsum by hemihydrate also leads to an increase of the ettringite formation rate during at least the five first hours under experimental conditions.

Domaines

Matériaux
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Dates et versions

hal-00452779 , version 1 (03-02-2010)

Identifiants

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Sylvie Pourchet, Laure Regnaud, André Nonat, Jean-Philippe Perez. Early C3A hydration in the presence of different kinds of calcium sulfate.. Cement and Concrete Research, 2009, 39, pp.989-996. ⟨10.1016/j.cemconres.2009.07.019⟩. ⟨hal-00452779⟩
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