Shumeiko V. Cement-Containing Compositions with Modifying Additives for Unmolded Masses

The object of research related to physical and chemical processes of the formation of structure and phase constitution of cement-containing compositions for unmolded masses obtained through the differential introduction of developed polycarboxylated additives and silica-containing additives of an anthropogenic origin and electrolyte additives and their combinations into the Portland cement and alumina cement. The aim of the study is the development of formulation technology parameters required to obtain unmolded masses of cement-containing compositions using physical and chemical peculiarities of modifying additives that contribute to the formation of a dense and firm structure of the cement stone and improve service properties. Research methods – thermodynamic, X-ray diffraction, differential-thermal, petrographic, electron microscopic, IR-spectroscopic, potentiometric. Physical-mechanical and service properties were determined according to the State Standard of Ukraine. Theoretical and practical results – taking into account scientific positions and obtained experimental data the formulation technology parameters for obtaining the cement-containing compositions for the manufacture of unmolded masses for various functional purposes have been developed and the expediency of regulation of structure and phase formation processes of cement stone with the use of modifying additives has been proved, this fact provides an increase in the operational characteristics of products on the basis of created materials. Novelty – the opportunity for the control of structure formation and phase formation during the hydration hardening of cement-containing compositions using the developed modifying additives to improve the performance characteristics of the unmolded masses of a different functional purpose has been theoretically substantiated and experimentally confirmed. Degree of implementation – the results of the thesis introduced in the PJSC “KOZ” (town of Druzhkovka, Donetsk Region) and Science and Production Company “Dominanta” Ltd (town of Konstantynovka, Donetsk region); in the educational process of the department of technology of ceramics, refractories, glass and enamels NTU "KhPI". Scope of application – сement-containing compositions developed can be used in the civil engineering for concrete work in the manufacture of structures and for the production of refractories on the base of unmolded masses, which are applied for lining of heat aggregates at enterprises of various branches of industry. The results of research can be recommended for training of specialists in the technology of refractory non-metallic and silicate materials in high schools.