The object of research: processes of directed formation of phase composition and structure of special polyfunctional cements on the basis of compositions the СаО–ВаО–Al2O3–Fe2O3–SiO2 system. Objective: creation of physical and chemical fundamentals of obtaining the special cements with high strength, heat and fire resistance, sulfate resistance, resistance to action of hard radiation on the basis of silicates, aluminates, ferrites and alumoferrites of calcium and barium. Research Methods and apparatus: thermodynamic, geometrical, topological, X-ray diffraction, differential thermal, infrared spectroscopy, petrographic and electron microscopy. Physical, mechanical and technical properties were determined in accordance with international standards. The experimental data were processed by performed using the methods of mathematical statistics. Theoretical and practical results: the scientific postulates were substantiated and the experimental data concerning development of compositions of special calcium-barium-containing cements, which are characterized with high operating indicators, were obtained, and also the resource-saving technology of their production with use of chemical industry wastes was developed. Technical documentation for the production of experimental- industrial batches of heat- and radiation-resistant cement and concrete based on it has been developed. Novelty: theoretical foundations for obtaining special calcium-barium-containing cements based on preassigned stable combinations of coexisting phases of the system CaО-BaО-Al2O3-Fe2O3-SiO2, which cause the production of binders for multifunctional purposes based on silicates, aluminates, ferrites and alumoferrites of calcium and barium. Degree of integration: the developed materials were tested at the following plants - under conditions of SPE "Spetskeramika" (Rubizhne, Luhansk region) - sacrificial materials for multilayer coating of the structural element of the system of passive protection of nuclear power plants; under conditions of BKP "Monolith" (Kostiantynivka, Donetsk region) - the grouting mortars; under conditions of LLC "Zaporizhspetsogneupor" (Zaporizhzhya) batches of radiation- and heat-resistant cements and concretes based on them have been produced and studied. Theoretical results have been incorporated in the practice of educational process of department “Technology of ceramics, refractories, glass and enamels” NTU “KhPI” for training of students of specialty 161.04 – “Chemical technology of refractory non-metal and silicate materials”. Application: developed materials can be appllied at the plants of refractory, oil-gas mining and nuclear power industries; the obtained theoretical regularities can be used for fundamental researches of multicomponent oxide systems and development of principles for creation of the newest advanced materials with the preassigned phase composition; the results of studies can be recommended for using in high schools at the training of specialists in technology of refractory non-metal and silicate materials.
