The study of the resistance of chloromagnesium composites to mediums saturated with sulfates

This article studies the resistance of composites based on dolomitic magnesian binders mixed with an aqueous solution of magnesium chloride to long-term exposure to liquid media saturated with sulfate ions. We evaluated the effect of the long-term saturation of samples in an aqueous solution of sodium sulfate on the change in their mass, linear dimensions, strength characteristics, and phase composition. Since magnesia binders belong to the group of air-hardening binders, two series of control samples were kept in air-dry conditions and in a state saturated with water. The duration of the experiment was six months. During this period, the change in the physical and mechanical characteristics and phase composition of the samples stored in water and an aqueous solution of sulfates are similar in nature and are caused by a low coefficient of water resistance of magnesia binders. No traces of chemical interaction of magnesium stone minerals with sulfate ions were found. Thus, chloromagnesium composites, provided that they have a high water-resistance coefficient, can be used in aggressive sulfate environments.