Abstract
Gypsum is a well-known mineral that is obtained from natural resources or from technological processes. Gypsum (calcium sulfate dihydrate) is burned to calcium sulfate hemihydrates or anhydrite to be used in different building materials. The hemihydrate and anhydrite react with water to form gypsum. This reaction, its kinetics and the reaction products’ morphology can be influenced in different ways. It is possible to change the reaction temperature, use additives or seed crystals or different templates on which the dihydrate can grow. Some of these methods are used in contemporary technical products. All of them have some desired influences but side effects as well. Citric acid, for example, is used to retard the reaction kinetics of gypsum or as a plasticizer, but it also changes gypsum’s morphology. The crystals get shorter with a larger diameter, which influences other technical properties. Citric acid poisons the fastest growing gypsum surface. Thus the reaction is decelerated and this is the reason for the morphological changes. Other fruity acids such as apple acid or tartaric acid could be used as well, but each of these acids works best in different pH values. Some polycarboxylate ethers also influence the hydration in the same way.
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Pritzel, C., Trettin, R. (2012). Influencing the Morphology of Gypsum. In: Broekmans, M. (eds) Proceedings of the 10th International Congress for Applied Mineralogy (ICAM). Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27682-8_64
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DOI: https://doi.org/10.1007/978-3-642-27682-8_64
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