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    A Simple Apparatus for Measurement of the Hydration Ratio of Plasters and Plaster Rocks

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    In the frame of calcium sulfate β-hemihydrate hydration kinetical studies, a simple experimental set up has been developed to determine the rate of hydration for different species of incompletely hydrated plaster specimens. This apparatus may also be used to determine with accuracy the amount of gypsum contained in plaster rocks, and acquire simultaneously quantitative analysis for six specimens. The apparatus is described, and the effect of vapor pressure is studied.

    Experimental results on incompletely hydrated plaster specimens show that either the weight loss or the integration curves allow the determination of the hydration ratio of the specimen with high accuracy. It has been experimentally shown that the amount of heat involved in the hydration reaction is proportional all along the reaction to the conversion rate.


    plaster, gypsum, anhydrite, vapor pressure, humidity, measure and integration, hydration ratio, plaster rocks, calcium sulfate β-hemihydrate, calcium sulfate dihydrate, reactor, water vapor molar fraction, isothermal calorimeter, thermoelectric captor

    Author Information:

    Karmazsin, E
    Associate professor, University Claude Bernard Lyon I, VILLEURBANNE Cedéx,

    Committee/Subcommittee: C11.01

    DOI: 10.1520/STP30270S