Impact of chloride-rich environments on cement paste mineralogy

Isabel Galan*, Lucie Perron, Fredrik P. Glasser

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Chloride is widely present in the service environment in which Portland cement concretes are used. High local concentrations of chloride can develop by wicking and evaporation, as for example in splash zones. The parallel sequence of mineralogical changes with increasing chloride forms Friedel's salt and subsequently, compounds containing Ca(OH)2, CaCl2 and H2O in ratios 3:1:12 and 1:1:0. New X-ray and thermal analysis data are presented for these phases. Their phase equilibria are presented and it is shown that Ca(OH)2 coexists with 3:1:12 at least up to 55 °C. It is suggested that the low physical density of 3:1:12, 1.62 g/cm3, and high water content contribute to the potential for expansion attending its formation in hardened matrices.

Original languageEnglish
Pages (from-to)174-183
Number of pages10
JournalCement and Concrete Research
Volume68
Early online date8 Dec 2014
DOIs
Publication statusPublished - Feb 2015

Keywords

  • Cement paste (D)
  • Chloride (D)
  • Degradation (C)
  • Durability (C)
  • Expansion (C)

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