Hydration and strength development in a cement kiln dust-fly ash system

Zhi Ge*, Kejin Wang, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In this paper, effects of mix proportion and curing temperature on hydration and strength development of pastes made with cement kiln dust (CKD) and fly ash (FA) was studied. Samples made with five different CKD-to-FA ratios, with and without type I ordinary Portland cement (OPC) as an additive, were cured at 24, 38, and 50°C. The hydration products of the pastes were examined using thermogravimetric analysis and X-ray diffraction tests. The results indicate that the strength of the pastes made with 75%CKD- 25%fly ash and 45%CKD-45%fly ash-10%OPC cured at 50°C reached over 70% and 80% strength of the paste made with 100%OPC at the ages of 28 and 56d, respectively. The major crystalline hydration product in the CKD-FA pastes was ettringite. Regardless of CKD-to-FA ratio, the amount of ettringite in the CKD-FA paste was considerably higher than that of the paste made with 100% OPC. The ettringite existed in the CKD-FA pastes stably for over 90d.

Original languageEnglish (US)
Pages (from-to)12-19
Number of pages8
JournalKuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
Volume40
Issue number1
StatePublished - Jan 1 2012

Keywords

  • Cement hydration
  • Cement kiln dust
  • Compressive strength
  • Fly ash
  • Thermal analysis

ASJC Scopus subject areas

  • Ceramics and Composites
  • Inorganic Chemistry
  • Materials Chemistry

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