| Title: | The influence of calcium sulfate content on the hydration of belite-calcium sulfoaluminate cements with different clinker phase compositions |
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| Authors: | ID Mrak, Maruša (Author)
ID Winnefeld, Frank (Author)
ID Lothenbach, Barbara (Author)
ID Dolenec, Sabina (Author) |
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| Files: |  PDF - Presentation file, download (1,74 MB)
MD5: 559FD40D758525FFB3E785B1A3C264E5
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MD5: AA5FFA8F05FA92E3446E90E1F4D0C891
 URL - Source URL, visit http://dx.doi.org/10.1617/s11527-021-01811-w
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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 different amounts of gypsum on the hydration of a belite-rich and a yeʼelimite-rich belite-calcium sulfoaluminate clinker (BCSA) was investigated. The hydration kinetics, phase assemblages and compressive strength development of cements prepared using yeʼelimite/ calcium sulfate molar ratios of 1, 1.5 and 2 were studied. Besides ettringite and monosulfate, aluminium hydroxide, strätlingite, C-S-H, iron-containing siliceous hydrogarnet and hydrotalcite were present as hydration products. Increasing the amount of gypsum increased the ratio of ettringite to monosulfate formed in the cement paste, lowered the amount of pore solution, delayed the dissolution of belite and ferrite, decreased the formation of strätlingite and, in the case of the yeʼelimite-rich BCSA, led to an increase in compressive strength. Increased amounts of belite in the clinker led to the formation of higher quantities of C-S-H, at the expense of straätlingite and a lower compressive strength, as belite has a lower degree of reaction than yeʼelimite and due to the formation of more C-S-H and stratlingite compared to the more space-filling ettringite. The thermodynamic model established for BCSA cement hydration agrees well with the experimental data. Compressive strength directly correlated with bound water from thermogravimetric analyses and inversely correlated with the porosity calculated from thermodynamic modelling. |
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| Keywords: | belite-calcium sulfoaluminate cement, gypsum, hydration, thermodynamic modelling |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 05.11.2021 |
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| Publisher: | Springer Netherlands |
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| Year of publishing: | 2021 |
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| Number of pages: | str. 1-17 |
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| Numbering: | Vol. 54 |
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| PID: | 20.500.12556/DiRROS-16159  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 1871-6873 |
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| DOI: | 10.1617/s11527-021-01811-w |
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| COBISS.SI-ID: | 84002051 |
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| Copyright: | © The Author(s) 2021 |
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| Note: | Article no.: 212;
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| Publication date in DiRROS: | 28.07.2023 |
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| Views: | 631 |
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| Downloads: | 537 |
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