Abstract

The isothermal kinetics of calcium sulphate hemihydrate hydration have been determined (i) by thermogravimetry and microcalorimetry for water vapour hydration and (ii) by microcalorimetry for liquid water hydration. The dehydration conditions of gypsum modify the reactivity of the obtained product. Only gypsum dehydrated in a vacuum or in a very low water pressure is likely to rehydrate. The mechanism “Le Chatelier” would not be only one to apply during hydration with liquid water.

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