| Naslov: | Quantitative in situ X-ray diffraction analysis of early hydration of belite-calcium sulfoaluminate cement at various defined temperatures |
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| Avtorji: | ID Mrak, Maruša (Avtor)
ID Lengauer, Christian L. (Avtor)
ID Dolenec, Sabina (Avtor) |
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| Datoteke: |  URL - Izvorni URL, za dostop obiščite https://www.mdpi.com/2075-163X/11/3/297
Opis: Odprti dostop
 PDF - Predstavitvena datoteka, prenos (4,59 MB)
MD5: D11CB7BC84165BACD2976BCE8DD750F8
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| Jezik: | Angleški jezik |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: |  ZAG - Zavod za gradbeništvo Slovenije
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| Povzetek: | 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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| Ključne besede: | in situ X-ray diffraction, hydration, temperature, cement, rietveld analysis |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Datum objave: | 11.03.2021 |
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| Založnik: | MDPI AG |
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| Leto izida: | 2021 |
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| Št. strani: | str. 1-21 |
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| Številčenje: | Vol. 11, no. 3 |
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| PID: | 20.500.12556/DiRROS-15853  |
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| UDK: | 620.1/.2 |
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| ISSN pri članku: | 2075-163X |
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| DOI: | 10.3390/min11030297 |
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| COBISS.SI-ID: | 54931459 |
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| Avtorske pravice: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
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| Opomba: | Nasl. z nasl. zaslona;
Opis vira z dne 12. 3. 2021;
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| Datum objave v DiRROS: | 26.06.2023 |
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| Število ogledov: | 644 |
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| Število prenosov: | 367 |
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| Metapodatki: |    |
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