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  • The influence of calcium sulfate content on the hydration of belite-calcium sulfoaluminate cements with different clinker phase compositions [Elektronski vir]
    Mrak, Maruša, 1993- ...
    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 devel- opment 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 silic- eous 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 thermo- gravimetric analyses and inversely correlated with the porosity calculated from thermodynamic modelling.
    Source: Materials and structures. - ISSN 1871-6873 (Vol. 54, Nov. 2021, str. 1-17)
    Type of material - e-article ; adult, serious
    Publish date - 2021
    Language - english
    COBISS.SI-ID - 84002051

    Link(s):

    https://link.springer.com/content/pdf/10.1617/s11527-021-01811-w.pdf

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