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Effect of Temperature on the Rate of Setting of Gypsum Plaster


EXPERIMENTS carried out in this laboratory with some commercial gypsum plasters show that, between 0° and 50° C., temperature may exert a comparatively small effect upon the rate of hydration of the calcium sulphate hemihydrate. In most cases, the induction period (defined as the time for the rate of increase of temperature to exceed 0.1° C. per min.) of mixtures of plaster and water contained in a Dewar flask is constant from 0° to 40° C., and the maximum rate of increase of temperature reaches a feeble maximum at about 25° C.1, although there are minor but distinct deviations from this pattern (see, for example, Fig. 3). Similar results have been found by Householder2.

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RIDGE, M. Effect of Temperature on the Rate of Setting of Gypsum Plaster. Nature 184, 47–48 (1959).

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