Complex Mineral Additives for the Modification of Calcium Sulphate Based Materials

Number of journal: 1-2-2021
Autors:

Batova М.D.,
Semenova Yu.А.,
Gordina А.F.,
Yakovlev G.I.,
Elrefai А.E.М.М.,
Saidova Z.S.,
Khazeev D.R.

DOI: https://doi.org/10.31659/0585-430X-2021-788-1-2-13-21
УДК: 666.914

 

AbstractAbout AuthorsReferences
The article presents the results of the investigation on the influence of active mineral additives on the processes of structure formation of gypsum binders. Portland cement and nanosilica, previously treated with ultrasound for 3 minutes in an aqueous medium with plasticizer, were used as components of the complex mineral additive. The average particle size of nanosilica was 0.025 μm. The main component of the additive was silicon dioxide. It was found out that the introduction of the gypsum binder modifier, consisting of Portland cement and nanosilica, increased the strength of gypsum compositions up to 40%. The activated complex additive improved the physical and mechanical properties of the material, both at the stage of hydration and during the hardening of the composition. In this case, an increase in the density of gypsum stone can be caused by an increase in the dispersion level of the silicate additive, particles of which act as crystallization centers, and also have greater activity of chemical interaction with the alkaline component, compared to the untreated additive. The introduction of Portland cement and activated nanosilica lead to the change in the composition of the matrix, which was characterized by increased density and strength. This happened due to the development of new formations in the structure of the stone, that were based on calcium silicate hydrates and bonded gypsum crystalline hydrates into blocks, filling the pore space of the material. The formation of new hydration products in the composition of the gypsum matrix was confirmed by physical and chemical analysis methods, including IR spectral and differential thermal analysis, scanning electron microscopy, and energy dispersive X-ray spectroscopy.
М.D. BATOVA1, Master student (This email address is being protected from spambots. You need JavaScript enabled to view it.),
Yu.А. SEMENOVA1, Master student (This email address is being protected from spambots. You need JavaScript enabled to view it.),
А.F. GORDINA1, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
G.I. YAKOVLEV1, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
А.E.М.М. ELREFAI2, Candidate of Sciences (Engineering), Associate professor (This email address is being protected from spambots. You need JavaScript enabled to view it.);
Z.S. SAIDOVA1, Master (Graduate student) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
D.R. KHAZEEV1, Candidate of Sciences (Engineering)

1 Kalashnikov Izhevsk State Technical University (7, Studencheskaya Street, Izhevsk, 426000, IRussian Federation)
2 Egyptian-Russian University (11829, Cairo-Suez road, Badr City, Cairo, Egypt)

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For citation: Batova М.D., Semenova Yu.А., Gordina А.F., Yakovlev G.I., Elrefai А.E.М.М., Saidova Z.S., Khazeev D.R. Сomplex mineral additives for the modification of calcium sulphate based materials. Stroitel’nye Materialy [Construction Materials]. 2021. No. 1–2, pp. 13–21. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2021-788-1-2-13-21


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