Alite calcium sulfoaluminate cement: Chemistry and thermodynamics

Theodore Hanein, Tristana Y. Duvallet, Robert B. Jewell, Anne E. Oberlink, Thomas L. Robl, Yongmin Zhou, Fredrik P. Glasser, Marcus N. Bannerman

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Calcium sulfoaluminate (C$A) cement is a binder of increasing interest to the cement industry and is undergoing rapid development. Current formulations do not contain alite; however, alite calcium sulfoaluminate (a-C$A) cements can combine the favourable characteristics of Portland cement (PC) with those of C$A cement while also having a lower carbon dioxide footprint than the current generation of PC clinkers. This paper presents two results on the formation of a-C$A clinkers. The first is a thermodynamic study demonstrating that the production of a-C$A clinker is possible without the use of mineralisers, doping with foreign elements, or using multiple stages of heating. It is established that a-C$A clinker can be readily produced in a standard process by controlling the oxygen and sulfur dioxide fugacity in the atmosphere. This allows for the stabilisation of ye'elimite to the higher temperatures required for alite stability. The second result establishes that when using fluorine to mineralise a-C$A clinker production, the iron content in the clinker is also an important variable. Although the exact mechanism of alite stabilisation is not known, it is shown that alite formation increases with the combination of calcium fluoride and iron (III) oxide in the mix.

Original languageEnglish
Pages (from-to)94-105
Number of pages12
JournalAdvances in Cement Research
Volume31
Issue number3
DOIs
StatePublished - Jun 1 2019

Bibliographical note

Publisher Copyright:
© 2018 ICE Publishing: All rights reserved.

Keywords

  • Clinkering
  • Clinkering reactions
  • Special cements
  • Sulfate-based cements

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science

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