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Changes in structure and composition of gypsum paste at elevated temperatures

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Abstract

The structure and composition of the gypsum at elevated temperatures were studied by means of scanning electron microscopy, X-ray diffraction (XRD) and thermogravimetry (TG). The gypsum paste samples were heated to the temperatures from 50 to 1000 °C. The changes in the structure of gypsum were in good accordance with the changes in properties. The crystals of calcium sulphate dihydrate were disrupted at the temperature between 50 and 100 °C, and the strength decreased significantly; after heating to 700 °C, the crystals started to be thicker and packed closer to each other and the strength increased again. After heating to 1000 °C, the strength was the same as the original strength. The results of XRD showed that the changes of calcium sulphate forms (dihydrate to hemihydrate and then to different modifications of anhydrite) were not sudden but occurred gradually, and different forms of calcium sulphate existed in the heated gypsum paste together. It was confirmed that several parallel or subsequent reactions occurred during dehydration. The dehydration started at the temperature under 50 °C and lasted up to 500 °C.

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Acknowledgements

This research has been supported by the Czech Science Foundation (GAČR 19-08605S).

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  1. Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29, Prague, Czech Republic

    A. Vimmrová, J. Krejsová, L. Scheinherrová, M. Doleželová & M. Keppert

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  1. A. Vimmrová
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  2. J. Krejsová
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  3. L. Scheinherrová
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Vimmrová, A., Krejsová, J., Scheinherrová, L. et al. Changes in structure and composition of gypsum paste at elevated temperatures. J Therm Anal Calorim 142, 19–28 (2020). https://doi.org/10.1007/s10973-020-09528-8

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