| Title: | Quantitative in situ X-ray diffraction analysis of early hydration of belite-calcium sulfoaluminate cement at various defined temperatures |
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| Authors: | ID Mrak, Maruša (Author)
ID Lengauer, Christian L. (Author)
ID Dolenec, Sabina (Author) |
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| Files: |  URL - Source URL, visit https://www.mdpi.com/2075-163X/11/3/297
Description: Odprti dostop
 PDF - Presentation file, download (4,59 MB)
MD5: D11CB7BC84165BACD2976BCE8DD750F8
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | 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. |
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| Keywords: | in situ X-ray diffraction, hydration, temperature, cement, rietveld analysis |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 11.03.2021 |
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| Publisher: | MDPI AG |
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| Year of publishing: | 2021 |
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| Number of pages: | str. 1-21 |
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| Numbering: | Vol. 11, no. 3 |
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| PID: | 20.500.12556/DiRROS-15853  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 2075-163X |
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| DOI: | 10.3390/min11030297 |
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| COBISS.SI-ID: | 54931459 |
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| Copyright: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 12. 3. 2021;
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| Publication date in DiRROS: | 26.06.2023 |
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| Views: | 332 |
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| Downloads: | 194 |
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