Water-resistant Gypsum Compositions with Man-made Modifiers

Gypsum composition with siltstone-based mineral modifier

“…Calcium carbonate was found during field analysis (the reaction to a solution of hydrochloric acid with carbon dioxide emission). , G.;Gordina, A.;Khritankov, V.;Khozin, V.;Shaybadullina, A.;Khazeev, D.;Bazhenova, I.;Ivakina, A.;Saidova, Z.;Repin, A. 2019.…”

“…In the spectrum in the area 2ϴ = 20 -44 degrees, the peaks are "blurred", which means there is an amorphous phase in the siltstone composition. , G.;Gordina, A.;Khritankov, V.;Khozin, V.;Shaybadullina, A.;Khazeev, D.;Bazhenova, I.;Ivakina, A.;Saidova, Z.;Repin, A. 2019.…”

“…The analysis of the spectrum of the check sample (Figure 9) allowed identifying the absorption bands, which correspond to various compounds: 400-520 cm -1 indicates the presence of a CaO ion; the wave values in the range of 600-700 cm -1 and 1000-1040 cm -1 confirm the presence of a sulfate group SO4 2-, absorption bands 875.68 and 1419.61 cm -1 show the presence of a carbonate grouping CO3 2-, absorption bands in the interval 1600-1800 cm -1 are caused by deformational vibrations of water molecules, and the vibrations in the frequency range 3400-3600 cm -1 are associated with symmetric and asymmetric stretching vibrations of OHgroups in water molecules. Yakovlev, G.;Gordina, A.;Khritankov, V.;Khozin, V.;Shaybadullina, A.;Khazeev, D.;Bazhenova, I.;Ivakina, A.;Saidova, Z.;Repin, A. 2019.…”

“…X-ray phase analysis was conducted with a general DRON-3 diffractometer in Bragg-Brentano mode in CuККα radiation monochromatized with graphite monochromator crystal, powder diffraction technique being used. Yakovlev, G.;Gordina, A.;Khritankov, V.;Khozin, V.;Shaybadullina, A.;Khazeev, D.;Bazhenova, I.;Ivakina, A.;Saidova, Z.;Repin, A. 2019.…”

“…At the same time, Russia has significant reserves of many mineral resources that can be used in the production of gypsum binders and compositions based on them. The additives used allow changing the morphology of gypsum crystalline hydrates, up to the formation on their surface of amorphous structures based on, above all, calcium hydrosilicates (Pervyshin et al 2016), which protect the gypsum crystals from the direct effect of water molecules, fill intercrystallite pores while tying gypsum crystals into an agglomerate of increased density. This leads to the complication and change in the course of physicochemical processes that occur during the self-organization of the structure of gypsum rock at the stage of the formation of its crystallization framework.…”