Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 155, Issue -, Pages 154-163Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.07.217
Keywords
Calcium sulfoaluminate cement; CSA; Calcium sulfate; Anhydrite; Gypsum; Hydration; Kinetics; Compressive strength; Thermodynamic modelling
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Funding
- Swiss Innovation and Promotion Agency CTI [14623.1 PFIW-IW]
- SaintGobain Weber AG, Winterthur, Switzerland
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The effect of the kind of calcium sulfate on the hydration of CSA cements was investigated. Thermal anhydrite, gypsum and a combination of anhydrite with gypsum were used at a constant molar ratio gypsum/ye'elimite of 0.8. With gypsum, ye'elimite dissolved faster than with anhydrite. When approximately 20 mass-% of anhydrite were replaced by gypsum, ye'elimite dissolution was as fast as in the system with plain gypsum. The dissolution of anhydrite was accelerated as well by the presence of gypsum. Thus the replacement of a part of the anhydrite by gypsum is able to enhance hydration kinetics and both early and late compressive strength. (C) 2017 Elsevier Ltd. All rights reserved.
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