Abstract :

The results of physical and chemical studies of the processes of hydration and structure formation during hardening of pozzolanic cements containing dry–selection ash and slag waste from the Angren TPP as an active mineral additive are presented. It has been established that, despite the replacement of up to 50% of the clinker part, the experimental cements acquire high hydraulic activity, which ensures their grade 400–500, which is facilitated by the presence of active silica, alumina and low–basic calcium silicates in the composition of the additive, which in the process of chemical interaction with hydration products clinker minerals are involved in the formation of a dense microstructure of the cement composite.

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Keywords :

Active mineral additive, Hardening, Hydration, Lime absorption, microstructure, Phase composition, Pozzolanic cement, Slagash from thermal power plants of dry selection, Strength., Student’s criterion

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References :

1. Parfenova, L.M. Review of foreign technologies for the utilization of ash and slag waste from thermal power plants / L.M. Parfenova, M.N. Vysotskaya // Geodesy, cartography, cadastre, GIS–problems and development prospects: materials of the international. scient. – pract. Conf., Novopolotsk, 9–10 Oct. 2016: at 2 o’clock / Polots. state un–t. Novopolotsk: PGU, 2016. – Part 2. – p. 138–143.
2. Parfenova L.M., Vysotskaya M.N., Paulo A.L. Fernandez, Portugal L. Complex binder based on Portland cement ash and slag waste from a thermal power plant / Yestnik of Polotsk State University. 2018. Series F 60, No.8. – p. 60–
3. Plugin A.A. Isotropic microreinforcement of cement stone with hydration products to improve the physical and mechanical characteristics of waterproofing coatings / A.A. Plugin, M.G. Salia, T.A. Kostyuk // Bulletin of NTU “KhPI”. Thematic Issue “Chemistry, chemical technology and ecology”. − Kharkiv, 2011. − Edit. 50. – 97−103.
4. Saliya M.G., Kostyuk T.A., Spirin Yu.A., Plugin A.A. Physico–chemical studies of cement stone with chemical and mineral additives that increase crack resistance and water resistance. Scientific prats UkrDAZT. 2012. – Edit. 130. – p. 49–56.
5. Malova E.Yu. Composite Portland cements with carbonate – containing additives and concretes based on them // Diss . PhD degree – 2015. – p. 160.
6. Sivkov S.P. Thermodynamic analysis of phase formation during hardening of carbonate–containing cements // Cement and its application. No. 4. – p. 112–115.
7. Catinaud S. Influence of limestone addition on calcium leaching mechanisms in cement–based materials / S. Catinaud, J.J Beaudoin, J. Marchand // Cement and Concrete Research, 2000. Vol. 30. – 1961–1968.
8. Papatzani S., Payne K., Calabria–Holly J. Strength and microstructure of cement stone with additives of colloidal SiO₂ / Cement and its application. 2014. – p. 1–4.
9. Himaliy E.A., Trofimov B.Ya., Kramar L.Ya. Structure and properties of stone with the addition of microsilica and polycarboxylate plasticizer // Bulletin of YurGU. 2009. No. 16. – 29–35.
10. Iskandarova M.I., Mukhiddinov D.D. Atabaev F.B. “Regulation of the hardening process and structure of formation of portlandcement by the addition of dark breeds of Uzbekistan” /Journal of Advanced Research in Dynamical and Control Systems, America, Vol. 12. 07–Special Issue, 2020. – p. 2054–
11. Mukhiddinov D.D., Iskandarova M.I. Properties of ultrafine microsilica and cements with its use // Uzbek chemical journal. – Tashkent, 2018. No. 6. – 32–40.
12. Buriev A.I., Begzhanova G.B., Iskandarova M. Energy and resource saving “green technology” for producing a new type of puzzolan cement // Proceedings of the International Conference “Process Management and Scientific Developments” (Birmingham, United Kingdom, June 9, 2021). 10.34660/INF.2021.85.54.024. – 144–150.
13. B. Begzhanova, M.I. Iskandarova, A.I. Buriev, D.D. Mukhiddinov. Physical and chemical bases for maximum utilization of active ash and slag wastes from thermal power plants for the production of pozzolanic cements / Collection of scientific articles based on the results of the work of the Interuniversity International Congress higher school: Scientific research. Moscow, 2021. – p. 128–136.