Letter | Published:

Plastic Deformation of Gypsum

Nature volume 193, pages 672673 (17 February 1962) | Download Citation



IT is a well known fact that a mixture of plaster of Paris (CaSO4½H2O) and water will hydrate and set into a brittle solid, and it is thought that this solid derives its strength from the felting together of the acicular gypsum (CaSO42H2O) crystals formed in the process. (There is some unpublished evidence to suggest that in fact the crystals can intergrow during the hydration process.) It is also known that the set material formed by this process exhibits plastic flow, or creep1–4, but no completely satisfactory explanation has been advanced. In the present work this plastic deformation has been investigated by two quite different techniques.

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  1. 1.

    , C.S.I.R.O. (Austral.) D.B.R. Rep. Z.7 (1959).

  2. 2.

    et al., C.S.I.R.O. (Austral.), D.B.R. Tech. Paper No. 9 (1960).

  3. 3.

    , Zement Kalk Gips, 13 (6), 259 (1960).

  4. 4.

    , Chem. Tech., 8, 659 (1956).

  5. 5.

    , Z. Kristall., 94, 375 (1936).

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  1. Research and Development Department, British Plaster Board (Holdings), Ltd., East Leake, Nr. Loughborough.

    • W. E. CRAKER
    •  & K. K. SCHILLER


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