20.500.12556/DiRROS-15853 Quantitative in situ X-ray diffraction analysis of early hydration of belite-calcium sulfoaluminate cement at various defined temperatures The influence of temperature on the early hydration of belite-calcium sulfoaluminate cements with two different calcium sulfate to calcium sulfoaluminate molar ratios was investigated. The phase composition and phase assemblage development of cements prepared using molar ratios of 1 and 2.5 were studied at 25, 40 and 60 ◦C by in situ X-ray powder diffraction. The Rietveld refinement method was used for quantification. The degree of hydration after 24 h was highest at ambient temperatures, but early hydration was significantly accelerated at elevated temperatures. These differences were more noticeable when we increased the temperature from 25 ◦C to 40 ◦C, than it was increased from 40 ◦C to 60 ◦C. The amount of calcium sulfate added controls the amount of the precipitated ettringite, namely, the amount of ettringite increased in the cement with a higher molar ratio. The results showed that temperature also affects full width at half maximum of ettringite peaks, which indicates a decrease in crystallite size of ettringite at elevated temperatures due to faster precipitation of ettringite. When using a calcium sulfate to calcium sulfoaluminate molar ratio of 1, higher d-values of ettringite peaks were observed at elevated temperatures, suggesting that more ions were released from the cement clinker at elevated temperatures, allowing a higher ion uptake in the ettringite structure. At a molar ratio of 2.5, less clinker is available in the cement, therefore these differences were not observed. in situ X-ray diffraction hydration temperature cement rietveld analysis in situ rentgenska difrakcija hidratacija temperatura cement rietveldova analiza true false true MDPI AG Angleški jezik Slovenski jezik © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Neznano 2022-11-30 10:52:12 2023-06-26 08:34:43 2023-06-27 03:35:21 0000-00-00 00:00:00 2021 0 0 Nasl. z nasl. zaslona; Opis vira z dne 12. 3. 2021; str. 1-21 no. 3 Vol. 11 Mar. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2021-03-11 620.1/.2 2075-163X 10.3390/min11030297 54931459 https://www.mdpi.com/2075-163X/11/3/297 Odprti dostop 1 490b09a7-708c-11ed-a69a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=20970 RAZ_Mrak_Marusa_2021.pdf RAZ_Mrak_Marusa_2021.pdf 1 D11CB7BC84165BACD2976BCE8DD750F8 ef69820176d25123129a64ddabd06b8f9330911c3bfded5b851a26278b73ca77 9a66b5c5-9891-11ed-b359-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=21403 Zavod za gradbeništvo Slovenije 0 0 0