Influence of Expansive Agent on the Dimensional Stability and Mechanical Properties of Gypsum Plaster

Abstract

Nowadays the use of gypsum plaster has gained momentum due to their economic and eco-friendly nature. The objective of this work was to study the influence of expansive agent such as CaO and MgO on the properties of the gypsum plaster. The effect of expansive agent on the physical, mechanical, water absorption and porosity were analyzed. The dimensional stability of the plaster with various percentages of Cao and MgO were also evaluated. From the results obtained it was confirmed that the addition of expansive agent increased the stability of the gypsum plaster to dimensional variation both during early hydration periods and also at hardened state without affecting the strength of the plaster.