Changes in structure and composition of gypsum paste at elevated temperatures

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00340488" target="_blank" >RIV/68407700:21110/20:00340488 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s10973-020-09528-8" target="_blank" >https://doi.org/10.1007/s10973-020-09528-8</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10973-020-09528-8" target="_blank" >10.1007/s10973-020-09528-8</a>

Result language
angličtina
Original language name
Changes in structure and composition of gypsum paste at elevated temperatures
Original language description
The structure and composition of the gypsum at elevated temperatures were studied by means of scanning electron microscopy, X-ray diffraction (XRD) and thermogravimetry (TG). The gypsum paste samples were heated to the temperatures from 50 to 1000 °C. The changes in the structure of gypsum were in good accordance with the changes in properties. The crystals of calcium sulphate dihydrate were disrupted at the temperature between 50 and 100 °C, and the strength decreased significantly; after heating to 700 °C, the crystals started to be thicker and packed closer to each other and the strength increased again. After heating to 1000 °C, the strength was the same as the original strength. The results of XRD showed that the changes of calcium sulphate forms (dihydrate to hemihydrate and then to different modifications of anhydrite) were not sudden but occurred gradually, and different forms of calcium sulphate existed in the heated gypsum paste together. It was confirmed that several parallel or subsequent reactions occurred during dehydration. The dehydration started at the temperature under 50 °C and lasted up to 500 °C.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/GA19-08605S" target="_blank" >GA19-08605S: Influence of fillers on the structure and properties of calcium sulphate composites</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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