Thermodynamic modeling of the influence of temperature on the hydrate phase assemblage in MOC

Abstract

Magnesium oxychloride cement (MOC) is usually applied in industrial flooring, thermal insulation wall panels, flue pipes and grinding wheels. However, studies on the influence of temperature on the phase assemblage in MOC are limited and inconsistent. A thermodynamic modeling approach is employed to explore the influence of temperature on the stable hydrate assemblage in MOC. The results reveal that at lower temperatures, a variation in temperature has little effect on the hydrate phase assemblage in MOC, and the volume deformation of the samples prepared with the optimal proportion is very small. Phase 3 and brucite become stable phases at relatively higher temperatures. MOC samples prepared with the optimal proportion cured at higher temperatures experience volume shrinkage.