AbstractAbout AuthorsReferences
The article presents the results of research on the modification of cement stone with microadditives of inorganic salts, such as CaCl2, Ca(NO3)2, CaSO4 and CuSO4. The dosage of the 2% salt solution varied from 0.2 to 1%, while the dry salt consumption was from 0.004 to 0.02% of the cement weight. It was found that all investigated additives in the dosage range of 0.2–1 wt. %, counting on 2% salt solution, are accelerators of cement hardening and modifiers that increase its strength. Compressive strength of cement stone with additives at all times of hardening is higher than that of control samples. The maximum strength values were shown by samples of cement stone at the age of 28 days of hardening with the addition of CaSO4 and Ca(NO3)2 – 85 MPa. For the salts CaCl2 and CuSO4, the compressive strength was 82.5 MPa and 68.8 MPa, respectively. It has been proven that an increase in the strength of a cement stone with microadditives of inorganic salts occurs in the early stages of hardening – 3, 7 days. The rate of strength gain of the cement stone reached 92–94% by 7 days of hardening in relation to the strength of the cement stone at 28 days of hardening. The mechanism of cement hydration with microadditives of inorganic salts is proposed
L.A. URKHANOVA, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
P.V. BEREZOVSKY, Еngineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.V. ARKHINCHEEVA, Candidate of Sciences (Chemistry)
P.V. BEREZOVSKY, Еngineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.V. ARKHINCHEEVA, Candidate of Sciences (Chemistry)
East Siberia State University of Technology and Management (40B, Klyuchevskaya Street, Ulan-Ude, 670013, Russian Federation)
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5. Batrakov V.G. Modifitsirovannye betony. Teoriya i praktika [Modified concrete. Theory and practice]. Moscow: Tekhnoproekt. 1998. 768 p.
6. Ibragimov R.A., Izotov V.S. Study of the effect of electrolytes on the physical and mechanical properties of heavy concrete. Vestnik Kazanskogo tehnologicheskogo universiteta. 2014. Vol. 17. No. 14, pp. 140–143. (In Russian).
7. Afanasyev N.F., Tseluiko M.K. Dobavki v betony i rastvory [Additives to concrete and mortars]. Kyiv: Budivelnyk. 1989. 128 p.
8. Urkhanova L.A., Tsydypova A.Ts. Influence of silica sol on physico-mechanical properties of polystyrene concrete. Stroitel’nye Materialy [Construction Materials]. 2018. No. 1–2, pp. 45–51. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2018-756-1-2-45-51
9. Gonchikova E.V., Arkhincheeva N.V., Dorzhieva E.V. Sodium silicate binders and materials based on them. Stroitel’nye Materialy [Construction Materials]. 2010. No. 11, pp. 42–43. (In Russian).
10. Bowers В., Daniels J., Anderson J. Field considerations for calcium chloride modification of soil-cement. Journal of Materials in Civil Engineering. 2014. 26.10.1061/(ASCE)MT.1943-5533.0000780
11. Komokhov P.G. Sol-gel as a concept of cement composite nanotechnology. Stroitel’nye Materialy [Construction Materials]. 2006. No. 9, pp. 89–90. (In Russian).
12. Mikhailov V.I., Krivoshapkina E.F., Demin V.A., Tropnikov E.M., Krivoshapkin P.V. Influence of nanodispersed iron (III) oxide on morphology of micro-sized fibers of aluminum oxide. Zhurnal obshchei khimii. 2016. No. 2, pp. 185–190. (In Russian). https://doi.org/10.1134/S107036321602002X
13. Krivoshapkin P.V., Mishakov I.V., Krivoshapkina E.F., Vedyagin A.A., Sitnikov P.A. Sol–gel template preparation of alumina nanofillers for reinforcing the epoxy resin. Journal of Sol-Gel Science and Technology. 2016. No. 2, pp. 353–361. https://doi.org/10.1007/s10971-016-4126-9
14. Mohammed Al-Ansari, Ala G. Abu-Taqa, Marwa M. Hassan, Ahmed Senouci, Jose Milla. Performance of modified self-healing concrete with calcium nitrate microencapsulation. Construction and Building Materials. 2017. Vol. 149, рр. 525–534. http://dx.doi.org/10.1016/j.conbuildmat.2017.05.152
15. Skripkiunas G., Kicaite A., Macijauskas M. The influence of calcium nitrate on the plasticizing effect of cement paste. Journal of civil engineering and management. 2016. Vol. 22 (3), pp. 434–441. DOI: 10.3846/13923730.2015.1120771
For citation: Urkhanova L.A., Berezovsky P.V., Arkhincheeva N.V. Modification of cement stone with microadditives of inorganic salts. Stroitel’nye Materialy [Construction Materials]. 2021. No. 1–2, pp. 22–29. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2021-788-1-2-22-29