Abstract
The study presents the results of operational properties of magnesia binders. The research objective is to determine the nature of aggressive liquid media impact on magnesia binders of various compositions. Comparative tests of strength properties of caustic magnesite and a combined magnesia-slag binder were carried out. Diffractometric analysis was used to study binders’ composition. Binders’ microstructure was studied by electron microscopy. The nature of impact of water, chloride and sulfate solutions on binders’ strength was estimated by a resistance coefficient. Effectiveness of combination of caustic magnesite and metallurgical slag was proven. Activating effect of the magnesia binder allows latent compounds of metallurgical slag to be involved in the hydrate formation processes. Expediency of using a complex grout containing solutions of magnesium chloride and sulfate for magnesia binders is shown. Aggressive effect of water and salt solutions on the strength properties of magnesite binders was studied. Information on the change in strength of binders after various periods of exposure to aggressive liquids was provided. The causes of destructive processes occurring in the magnesite binders were identified. Magnesium pentahydroxychloride’s decisive role in the formation of durability of magnesite stone was confirmed. The nature of impact of aggressive salt environments on durability of binders of various compositions was established. Technological methods for increasing durability of magnesite binders in the liquid environments were proposed, consisting in the rational minimization of magnesium pentahydroxychloride due to the use of a combined binder and (or) complex salt grouting fluids