Effects of curing temperature and NaOH addition on hydration and strength development of clinker-free CKD-fly ash binders

Kejin Wang*, Surendra P. Shah, Alexander Mishulovich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

Effects of curing temperature and NaOH addition on hydration and strength development of cement kiln dust (CKD)-fly ash (FA) binders were investigated. Pastes made with 50% CKD and 50% FA, having 0, 2, and 5% NaOH addition, and cured at temperatures of 24, 38, and 50 °C were evaluated. The hydration products of the binders were examined by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) tests. The results indicate that the major crystalline hydration product of the CKD-FA binders is ettringite, and the ettringite is stable in the CKD-FA system at age over 100 days. Curing at elevated temperature is more effective for CKD-FA binder strength improvement than NaOH addition, the later often depressing ettringite formation in a CKD-FA system. At a proper curing temperature (38 °C), addition of a small amount of NaOH (2%) may increase CKD-FA binder strength; while at a high curing temperature (50 °C), addition of NaOH (2%) may reduce the binder strength.

Original languageEnglish (US)
Pages (from-to)299-309
Number of pages11
JournalCement and Concrete Research
Volume34
Issue number2
DOIs
StatePublished - Feb 1 2004

Keywords

  • Cement kiln dust
  • Elevated curing temperature
  • Fly ash
  • NaOH addition
  • Thermal analysis
  • X-ray diffraction
  • XRD

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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