Phase equilibria in the system Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>SO<sub>4</sub> – Ca<sub>2</sub>SiO<sub>4</sub> – CaSO<sub>4</sub> – H<sub>2</sub>O referring to the hydration of calcium sulfoaluminate cements

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

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
Published
2016-04-18
How to Cite
WINNEFELD, Frank; LOTHENBACH, Barbara. Phase equilibria in the system Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 – H2O referring to the hydration of calcium sulfoaluminate cements. RILEM Technical Letters, [S.l.], v. 1, p. 10-16, apr. 2016. ISSN 2518-0231. Available at: <https://letters.rilem.net/index.php/rilem/article/view/5>. Date accessed: 18 oct. 2018. doi: https://doi.org/10.21809/rilemtechlett.2016.5.
Section
Articles

Keywords

Calcium sulfoaluminate cement; Hydration; Thermodynamic modelling; Phase diagram