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Article Dans Une Revue Advances in Cement Research Année : 2018

Hydration of calcium aluminate cement blended with anhydrite

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Résumé

Calcium aluminate cements (CACs) are used in combination with calcium sulfates as binders in self-levelling mortars. The influence of commercial CAC/anhydrite ratio on the solid phase assemblage and pore solution at water to binder (w/b) ratios of 0·40 and 0·72 was investigated between 1·5 h and 91 d of hydration using a multi-method approach including x-ray diffraction, thermogravimetric analysis and thermodynamic calculations. The reduction of the extent of hydration at the lower w/b ratio can be explained by a lack of water for complete hydration and lack of space. In the system with a CAC/anhydrite weight ratio of 1, ettringite and AH3 were the main hydration products, whereas in the case of a CAC/anhydrite ratio of 2·3, in addition to ettringite and AH3, monosulfate was present along with strätlingite and at a later age. In contrast to the thermodynamic modelling results, anhydrite persisted even at low calcium sulfate contents as the precipitation of AH3 around the anhydrite grains seemed to lead to a chemical blocking.
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Dates et versions

hal-02497775 , version 1 (09-03-2020)

Identifiants

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Gwenn Le Saout, Barbara Lothenbach, Pascal Taquet, Hervé Fryda, Frank Winnefeld. Hydration of calcium aluminate cement blended with anhydrite. Advances in Cement Research, 2018, 30 (1), pp.24-36. ⟨10.1680/jadcr.17.00045⟩. ⟨hal-02497775⟩
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