Comparative Analysis of Hydration Expansion Performance of Desulfurized gypsum-baseda/β Gypsum

Gypsum has micro-expansion characteristic during the process of hydration and solidification, and there are certain differences in the hydration expansion characteristics of different types of hemihydrate gypsum. In this paper, by analysing the gypsum crystal morphology, particle size distribution, hydration heat, dimensional change rate, and morphology change of hydration products in the process of hydration process, the hydration expansion performance of α/β gypsum are compared and discussed. The results indicate there are differences in the hydration swelling mechanism between α-gypsum and β-gypsum. The expansion of gypsum is the result of the combined effect of the crystal transformation and the release hydration heat during the hydration process. The particle size distribution and the amount of hydration water added have a great influence on the expansion performance.