Abstract
Gypsum plaster sets quickly due to its natural process of crystallization. For commercial applications, the retardation of plaster to a desired level is required. The effect of various chemicals as retarders on the setting time, compressive strength and microstructure of the gypsum plaster was investigated at pH 4 to 12 adjusted by the addition of Ca(OH) 2 or HCl to gypsum plaster. It was found that retardation factor has no direct relation with the compressive strength of gypsum plaster but pH is certainly related to the strength factor. Maximum compressive strength of the plaster was obtained at pH 7.0. The morphology of the hardened gypsum plaster was found to change according to variation in the pH of the aqueous phase as well as the nature of retarder added.
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