Structure and properties of magnesia stone obtained by activation of caustic dolomite

Introduction. The solution of the actual problem of deficit of reserves of raw materials with high MgO content by involving low-magnesian raw materials from dolomitized limestone into production is presented. For this purpose, it was proposed to increase the activity of the binder using preliminary mechanical activation in the vortex layer device. The aim of the study is to determine the effect of mechanical activation of caustic dolomite with plasticizers in the vortex layer device on the composition, structure and properties of magnesia stone.

Materials and methods. Mechanical activation of the caustic dolomite was performed using a vortex layer device and the surface analysis of obtained specimens was carried out using a laser analyzer. X-ray analysis was used to determine the phase composition of the obtained specimens.

Results. Regularities of hardening, phase composition of magnesia binders from duration of dispersion of caustic dolomite powder and concentration of plasticizing additives were investigated for the first time. A dense and strong matrix with high physical and mechanical properties is obtained. The effect of plasticizing additives based on lignosulfonate, polyester polycarboxylate and naphthalene sulfate formaldehyde on the composition, properties and structure of magnesia stone before and after activation of the binder is studied. The most effective additive concentrations were determined to increase the compression strength of magnesia stone from 35 to 120 % at the age of 28 days. The optimal duration range of activation was established and scientifically validated its impact on physical-chemical and morphological properties of the obtained specimens.

Conclusions. Activation of magnesia binder with additives under optimal treatment conditions in the vortex layer device allows to obtain a magnesia stone with an adjustable set of properties: high density, compression strength in grades. The increase in strength of modified magnesia stones activated in vortex layer device with the addition of plasticizer is explained by higher density structure, low crystallite size and high density of dislocations.

1. Rakhimov R.Z. Fuel and energy complex, ecology and mineral binders. News of the Kazan State University of Architecture and Engineering. 2022; 3(61):67-74. DOI: 10.52409/20731523_2022_3_67. EDN HOAOTX. (rus.).

2. Khozin V.G. Prospects for the development of the building materials industry in the light of the use of secondary resources. Polymers in Construction: Scientific Online Journal. 2023; 1(11):22-29. EDN NEVNVS. (rus.).

3. Ermilova E.Yu., Kamalova Z.A. Blended Portland cements with complex mineral additives as a solution of the problem man-made industrial waste utilization. Construction, Buildings and Structures. 2023; 2(3):4-10. EDN KANWFM. (rus.).

4. Zyryanova V.N., Berdov G.I. Magnesium binders from high-magnesium waste. News of Higher Educational Institutions. Construction. 2005; 10(562):46-53. EDN PFAKQX. (rus.).

5. Tretyakov Yu. Solid-phase reactions. Moscow, Khimiya, 1978; 359. (rus.).

6. Voskresenskaya L.E. Some Aspects of Making Next-Generation Magnesium Binders. Education. Science. Culture : materials of the international scientific forum. 2016; 857-862. EDN ZNZXHB. (rus.).

7. Marchik E.V. Hardening of magnesium cement based on caustic dolomite. Proceedings of the National Academy of Sciences of Belarus. Chemical Series. 2010; 3:10-14. EDN GBOZIK. (rus.).

8. Ibragimov R.A., Korolev E.V. Strength of composites on Portland cement modified with carbon nano-tubes and processed in a vortex layer apparatus. Industrial and Civil Engineering. 2021; 1:35-41. DOI: 10.33622/0869-7019.2021.01.35-41. EDN UZUOSG. (rus.).

9. Malkin A.I. Regularities and mechanisms of the re-hbinder’s effect. Colloid Journal. 2012; 74(2):239. EDN OWEPSL. (rus.).

10. Golik V.I., Titova A.V. Combined activation technologies mineral raw materials. Mining Industry. 2021; 5:100-105. DOI: 10.30686/1609-9192-2021-5-100-105. EDN NNYLBN. (rus.).

11. Ibragimov R.A., Potapova L.I., Korolev E.V. Investigation of structure formation of activated nanomodified cement stone by IR spectroscopy. News of the Kazan State University of Architecture and Engineering. 2021; 3(57):41-49. DOI: 10.52409/20731523_2021_3_41. EDN XHUPYY. (rus.).

12. Kosareva A.V., Savitskaya Yu.A., Kharlamova K.I. Evaluation of the effectiveness of fractionation methods of dispersed microparticles. Polymers in Construction: Scientific Online Journal. 2024; 1(12):100-103. EDN AENNLJ. (rus.).

13. Vdovin E.A., Bulanov P.E., Stroganov V.F. Improving the characteristics of road soil-cement with organosilicon compounds. News of the Kazan State University of Architecture and Engineering. 2023; 4(66):301-309. DOI: 10.52409/20731523_2023_4_301. EDN JZUJND. (rus.).

14. Makó É. The effect of quartz content on the mechanical activation of dolomite. Journal of the European Ceramic Society. 2007; 27(2-3):535-540. DOI: 10.1016/j.jeurceramsoc.2006.04.170

15. Tole I., Habermehl-Cwirzen K., Rajczakowska M., Cwirzen A. Activation of a raw clay by Mechanochemical process — effects of various parameters on the process efficiency and cementitious properties. Materials. 2018; 11(10):1860. DOI: 10.3390/ma11101860

16. Khodakov G.S. Grinding physics. Moscow, Nauka, 1972; 307. (rus.).

17. Gadzhiev A.M., Kurbanov R.M., Khadzhishalapov Kh.N., Hejev T.A. The influence of the filler grain composition on the properties of the heat-resistant basaltic concrete. Herald of Dagestan State Technical University. Technical Sciences. 2017; 44(3):146-155. DOI: 10.21822/2073-6185-2017-44-3-146-155. EDN ZWDGFD. (rus.).

18. Vol′f A.V., Manokha A.M., Aladikova O.E. Effect of modifying additives on the properties of magnesium binders. Polzunovsky Almanac. 2019; 2-1:49-52. EDN WDSMQR. (rus.).

19. Chernykh T.N., Ulrikh D.V., Kriushin M.V. Plasticization of mixtures based on oxychloride cement using additives. Engineering journal of Don. 2021; 12(84):409-419. EDN AGLGYY. (rus.).

20. Ibragimov R.A., Korolev E.V., Deberdeev T.R., Leksin V.V. Durability of heavy-weight concrete with Portland cement treated in apparatus of vortex layer. Construction Materials. 2017; 10:28-31. EDN ZRPHGT. (rus.).

21. Bikaeva Y., Ibragimov R., Korolev E., Kiyamov I., Kiyamova L. Low-temperature calcination composite binder from dolomite and its application to facing board materials. Case Studies in Construction Materials. 2023; 19:e02338. DOI: 10.1016/j.cscm.2023.e02338

22. Makridin N.I., Korolev E.V., Maksimova I.N. Structure formation and structural strength of cement composites. Moscow, MGSU, 2013; 152. EDN ROKBIJ. (rus.).

23. Fetisov G.V. Synchrotron radiation. Methods of studying the structure of substances. Moscow, 2007; 672. EDN MUYCUL. (rus.).

24. Zimich V.V., Kramar L.Ya., Chernich T.N., Pudovikov V.N., Perminov A.V. Peculiar features of influence of admixture of iron hydroxide sol on the structure and properties of magnesia stone. Bulletin of SUSU. Series “Construction Engineering and Architecture”. 2011; 35(252):25-32. EDN OJNPPD. (rus.).

25. Vinokurov S.E., Kulikova S.A., Krupskaya V.V., Tyupina E.A. Effect of characteristics of magnesium oxide powder on composition and strength of magnesium potassium phosphate compound for solidifying radioactive waste. Journal of Applied Chemistry. 2019; 92(4):450-457. DOI: 10.1134/S0044461819040042. EDN ZAQDRB. (rus.).

26. Strokova V.V., Aizenshtadt A.M., Sival’neva M.N., Kobzev V.A., Nelubova V.V. Activity evaluation of nanostructured binders with using thermodynamic method. Construction Materials. 2015; 2:3-9. EDN TJDRAB. (rus.).

27. Ibragimov R.A., Korolev E.V., Bikaeva Yu.V., Larionov I.S. The contact angles of quartz and caustic dolomite powders after mechano-magnetic treatment. Construction Materials. 2024; 3:64-70. DOI: 10.31659/0585-430X-2024-822-3-64-70. EDN CUIUFP. (rus.).