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Determination of a partial phase composition in calcined gypsum by calorimetric analysis of hydration kinetics

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Abstract

A calorimetric method for the determination of a partial phase composition in calcined gypsum is presented. The method is based on the separation of the reaction heat of the transformation of β-anhydrite III to β-hemihydrate from the main hydration reaction transforming β-anhydrite III to dihydrate. Using the known hydration heats of β-anhydrite III to dihydrate and β-hemihydrate to dihydrate, the content of β-calcium sulfate anhydrite III and β-calcium sulfate hemihydrate as well as the amount of non-hydrating parts in gypsum can be determined. Practical application of the method is illustrated on three industrial products.

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Acknowledgements

This research has been supported by the Ministry of Education, Youth and Sports of the Czech Republic, under contract No MSM: 6840770031. The authors also wish to thank Pavel Tesárek for technical assistance with the experiments.

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Authors and Affiliations

  1. Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29, Prague 6, Czech Republic

    Vratislav Tydlitát & Robert Černý

  2. Department of Physics, Constantine the Philosopher University, Tr. A. Hlinku 1, 949 74, Nitra, Slovakia

    Igor Medveď

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  1. Vratislav Tydlitát
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  2. Igor Medveď
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  3. Robert Černý
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Correspondence to Robert Černý.

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Tydlitát, V., Medveď, I. & Černý, R. Determination of a partial phase composition in calcined gypsum by calorimetric analysis of hydration kinetics. J Therm Anal Calorim 109, 57–62 (2012). https://doi.org/10.1007/s10973-011-1334-y

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  • DOI: https://doi.org/10.1007/s10973-011-1334-y

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