About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Yuliya V. Bikaeva, assistant student, Kazan State University of Architecture and Engineering, Kazan, Russian Federation Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID: 0000-0003-2382-1023 Ruslan A. Ibragimov, candidate of technical sciences, associate professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it ,ORCID: 0000-0001-8879-1190 |
| Title of the article | Study of the influence of metakaolin on the hydration products of magnesia stone based on caustic dolomite |
| Abstract. | Problem statement. An important issue in the use of magnesia binders is the formation of free magnesium hydroxide, which reduces the strength and performance characteristics of the products. This study investigates the effect of metakaolin on the physicochemical properties, phase composition, and microstructure of magnesia stone based on caustic dolomite. The aim of the research was to investigate the influence of metakaolin concentration on the phase composition and strength of magnesia stone at 28 days of age, and to determine the optimal concentration of metakaolin. The research objectives were to determine the effect of metakaolin content on the properties of magnesia stone, to analyze the structure and phase composition of magnesia stone upon metakaolin addition, and to establish the optimal metakaolin concentration for forming a stable material matrix. Results. The effect of metakaolin addition up to 20% by mass of caustic dolomite on the strength and density of magnesia stone was determined, and the hydrate structure was studied using X-ray diffraction and electron microscopy. At metakaolin concentration of 7–10%, the reduction in compressive strength was minimal (up to 6.4%), indicating the possibility of using such dosages without significant deterioration of performance characteristics for magnesia binders. Microstructural analysis showed the formation of magnesium hydrosilicates and aluminosilicates that contribute to the reinforcement of magnesia stone. Conclusions. Metakaolin actively interacts with the hydration products of magnesia binders, altering the microstructure and phase composition of the magnesia stone. The optimal additive concentration ensures the formation of a stable matrix and the preservation of the material’s strength properties. |
| Keywords. | magnesiа binder; caustic dolomite; metakaolin; microstructure; mechanical properties; compressive strength; hydration |
| For citations: | Bikaeva Yu.V., Ibragimov R.A. Study of the influence of metakaolin on the hydration products of magnesia stone based on caustic dolomite // News of KSUAE, 2025, No. 4 (74), P. 76-86, DOI: 10.48612/NewsKSUAE/74.7, EDN: FAOGAK |
