Study of Gypsum Samples with Additions of Mineral Particles

The DSC method revealed endothermic effects (–613.9 J/g) during gypsum dihydrate heating associated with the heat absorption during the release of crystalline hydrate water in the range of 100–250°C during the heating process. Mass losses during water evaporation were determined by TGA and amount of...

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Veröffentlicht in:Polymer science. Series D, Glues and sealing materials Glues and sealing materials, 2024, Vol.17 (2), p.402-406
Hauptverfasser: Blaznov, A. N., Vereshchagin, P. V., Zadvornykh, G. S., Sakoshev, E. G., Chashchilov, D. V., Sakoshev, Z. G., Firsov, V. V., Bychin, N. V.
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container_issue 2
container_start_page 402
container_title Polymer science. Series D, Glues and sealing materials
container_volume 17
creator Blaznov, A. N.
Vereshchagin, P. V.
Zadvornykh, G. S.
Sakoshev, E. G.
Chashchilov, D. V.
Sakoshev, Z. G.
Firsov, V. V.
Bychin, N. V.
description The DSC method revealed endothermic effects (–613.9 J/g) during gypsum dihydrate heating associated with the heat absorption during the release of crystalline hydrate water in the range of 100–250°C during the heating process. Mass losses during water evaporation were determined by TGA and amount of up to 20%. The thermal conductivity coefficient of gypsum samples is 0.288 W/m K. The influence of mineral additives—glass spheres, wollastonite, and chopped basalt fiber—on changes in the properties of gypsum samples at curing times of 2 h and 1, 3, 7, and 14 days was studied. An addition of glass spheres up to 10 wt % reduces gypsum strength by 10–13% and density, by 16%, additive up to 20 wt % reduces strength by two times and density by 36–40%, and additive up to 50 wt % reduces strength by from five to six times and density by 80–85%, with the thermal conductivity coefficient decreasing to 0.236 W/m K. An addition of wollastonite 10–20 wt % increases the strength of gypsum samples by 13–16%, and addition of 50 wt % reduces the strength by two times. An addition of 0.5–1.5 wt % chopped basalt fibers increases strength by 10–16%, as well as the strength gain rate. Additions of wollastonite and basalt fibers practically do not change the density of gypsum samples, but increase the thermal conductivity coefficient to 0.320–0.373 W/m K.
doi_str_mv 10.1134/S1995421224700679
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identifier ISSN: 1995-4212
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issn 1995-4212
1995-4220
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subjects Basalt
Chemistry
Chemistry and Materials Science
Coefficients
Density
Gypsum
Heat conductivity
Heat transfer
Heating
Polymer Sciences
Thermal conductivity
Wollastonite
title Study of Gypsum Samples with Additions of Mineral Particles
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