Abstract
The article presents the results of studies of magnesia binders of various material compositions. The purpose of the work is to study the technological and operational properties of composite magnesia binders containing metallurgical slag and magnetite ore. Solutions of magnesium chloride and magnesium sulfate, as well as a mixture of them, were used to seal magnesia binders. The technological properties of magnesia binders were evaluated by the consumption of saline solution, consistency, and viscosity changes of the suspensions. To determine the operational quality of composite binders, indicators of density, strength, water absorption and water resistance were used. The dependences of the rheological properties of suspensions on the composition of the dispersed phase and the type of saline solution are revealed. The operational advantages of composite magnesia binders have been established and substantiated: increased density, lower water absorption, increased water resistance and comparable strength compared with caustic magnesite. The directions of using the developed magnesia-slag and magnesia-magnetite binders are proposed. The research results are aimed at developing resource-saving technologies for magnesia binders and concretes.