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The setting of gypsum plaster

Part II The development of microstructure and strength

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Abstract

The setting process of gypsum plasters has been followed using strength testing, acoustic techniques and scanning electron microscopy. Gypsum plasters were found to set in three stages: formation of the calcium sulphate dihydrate crystal matrix followed by relief of internal stress, and finally evaporation of excess water. The α-calcium sulphate hemihydrate set faster than the β-form, giving a higher initial and final set strength. The set α-plaster consisted of relatively short stubby dihydrate needles with a greater degree of intercrystalline bonding, resulting in greater strength. The microstructure of set α-plaster appeared to be the result of a slower precipitation rate of dihydrate during the hydration reaction of hemihydrate.

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Authors and Affiliations

  1. Building Research Establishment, WD2 7JR, Watford, UK

    A. J. Lewry

  2. Materials Department, Imperial College, SW7 2BP, London, UK

    J. Williamson

Authors
  1. A. J. Lewry
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  2. J. Williamson
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Lewry, A.J., Williamson, J. The setting of gypsum plaster. JOURNAL OF MATERIALS SCIENCE 29, 5524–5528 (1994). https://doi.org/10.1007/BF00349943

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  • DOI: https://doi.org/10.1007/BF00349943

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