Stability of stratlingite in the CASH system

M. U. Okoronkwo*, F. P. Glasser

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Stratlingite, a siliceous AFm-type phase associated with blended cement hydration, is often assigned a fixed composition, 2CaO center dot Al2O3 center dot SiO2 center dot 8H(2)O, but our knowledge of its stability and compatibility with other phases is limited. The phase relations and thermal stability of stratlingite in the CASH system are reported. Stratlingite shows a relatively fixed composition and is compatible with C-S-H and hydrogarnet solid solution at appropriate temperatures but is not compatible with portlandite and decomposes in its presence. It is stable in cement hydrate systems high in aluminosilicate content. Its stability decreases with increasing temperature, with an upper limit of stability approximately 90 +/- A 5 A degrees C: above which it progressively decomposes to other solids, mainly hydrogarnet solid solution.

Original languageEnglish
Pages (from-to)4305-4318
Number of pages14
JournalMaterials and Structures/Materiaux et Constructions
Volume49
Issue number10
Early online date4 Jan 2016
DOIs
Publication statusPublished - Oct 2016

Keywords

  • thermal analysis
  • X-ray diffraction
  • stability
  • stratlingite
  • C-S-H
  • hydrogarnet solid solution
  • calcium silicate hydrate
  • high-alumina cement
  • Portland-cement
  • fly-ash
  • sintering behavior
  • metakaolin
  • pastes
  • phases
  • microstructure

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