Phase equilibria in the system Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 – H2O referring to the hydration of calcium sulfoaluminate cements

Frank Winnefeld; Barbara Lothenbach

doi:10.21809/rilemtechlett.2016.5

Phase equilibria in the system Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 – H2O referring to the hydration of calcium sulfoaluminate cements

Authors

Frank Winnefeld Empa, Swiss Federal Laboratories for Materials Science and Technology
Barbara Lothenbach Empa, Swiss Federal Laboratories for Materials Science and Technology

DOI:

https://doi.org/10.21809/rilemtechlett.2016.5

Keywords:

Calcium sulfoaluminate cement, Hydration, Thermodynamic modelling, Phase diagram

Abstract

This paper presents thermodynamic calculations of the stable hydrate assemblages in calcium sulfoaluminate cements containing different amounts of ye’elemite, calcium sulfate and belite. The ternary diagrams developed in this paper can be used directly to assess the long-term composition of such calcium sulfoaluminate cements containing belite. The phase diagram was validated using experimental data from literature. The ternary diagrams developed can be used to read out directly the stable hydrate assemblage of calcium sulfoaluminate cements containing belite based on their initial composition.

Ternary diagram Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 at 20°C : total volume of hydrates in cm3 per 100 g unhydrated solid

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Published

18.04.2016

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Winnefeld, F.; Lothenbach, B. Phase Equilibria in the System Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 – H2O Referring to the Hydration of Calcium Sulfoaluminate Cements. RILEM Tech Lett 2016, 1, 10-16.

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Issue

Vol. 1 (2016)

Section

Articles

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Authors retain copyright of the articles published in RILEM Technical Letters and grant the journal the right of first publication with open access. The work is simultaneously licensed under Creative Commons Attribution 4.0 International License (CC BY 4.0) that allows others to share and adapt the work under the following terms: 1) a proper attribution is given in a form of a reference to the original work's authorship and initial publication in RILEM Technical Letters (bibliographic record with the DOI link); 2) a link to the license is provided; 3) the changes (if any) are indicated.