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MICROSTRUCTURE OF GYPSUM PASTE AT ELEVATED TEMPERATURES

Krejsova, J.; Dolezelova, M.; Vimmrova, A.
Abstract:
Gypsum paste was subjected to the temperatures up to 1000 °C and its microstructure was investigated by SEM microscopy. The volume and mass changes were also measured and the bulk density, porosity and residual strength were determined. After heating to the 1000 °C the structure of paste changed substantially, as can be seen in the micrographs. The structure of heated material is denser and the anhydrite crystals are bigger. The volume of the samples decreased more than 50%. The bulk density increased by 20%, while the porosity decreased correspondingly. The compressive strength firstly decreased to 17% at 100 °C, but after heating to 1000 °C it increased again to the initial value.
SGEM Research areas:
Year:
2018
Type of Publication:
In Proceedings
Keywords:
gypsum; high temperature; SEM; microstructure
Volume:
18
SGEM Book title:
18th International Multidisciplinary Scientific GeoConference SGEM2018
Book number:
6.4
SGEM Series:
International Multidisciplinary Scientific GeoConference-SGEM
Pages:
471-478
Publisher address:
51 Alexander Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
Period:
3 – 6 December, 2018
ISBN:
978-619-7408-71-3
ISSN:
1314-2704
Conference:
18th International Multidisciplinary Scientific GeoConference SGEM2018, 3 – 6 December, 2018
DOI:
10.5593/sgem2018V/6.4/S09.059
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