Materiales de Construcción, Vol 41, No 222 (1991)

Mechanism of gypsum hydration


https://doi.org/10.3989/mc.1991.v41.i222.743

G. Pacheco
ESFM-Depto. de Ciencia de Materiales IPN, Mexico

M. Portilla
DEPg-Fac. de Química UNAM, Mexico

Abstract


There is an hypothesis that the mechanism o f gypsum hydration and dehydration is performed through two simultaneous phenomena.
In this study we try to clear up this phenomenon using chlorides as accelerators or a mixture of ethanol-methanol as retarders to carry out the gypsum setting.
Natural Mexican gypsum samples and a hemihydrate prepared in the laboratory are used. The following analytical techniques are used: MO, DRX, DTA, TG and DTG.
In agreement with the obtained results, it can be concluded: that colloid formation depends on the action of accelerators or retarders and the crystals are a consequence of the quantity of hemihydrate formed.

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Copyright (c) 1991 Consejo Superior de Investigaciones Científicas (CSIC)

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