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Activated fly ash/slag blended cement

Author

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  • Zhao, Feng-Qing
  • Ni, Wen
  • Wang, Hui-Jun
  • Liu, Hong-Jie

Abstract

This paper presents the results of the preparation of an ecological cementing material from granulated blast-furnace slag (GBFS) and Class C fly ash (CCFA). The desulphurization gypsum, calcined at 600–800°C for 0.5–1.5h, works as the main ingredient of the activator in the cementing material. The optimized formulation of the cementing material was obtained with the aid of factorial design method: slag, 70%; CCFA, 18%; activator, 12%. The “partial super-fine grinding process” was adopted to improve the performance, i.e., 85% of the mixture is ground to Blaine fineness of 3500cm2/g, 15% further ground to around 5000cm2/g. The compressive strength of 28 days of the cement mortar is up to 49MPa and flexural strength 8.4MPa. The hydration products, investigated by SEM and X-ray diffraction, are mainly ettringite and C–S–H gel.

Suggested Citation

  • Zhao, Feng-Qing & Ni, Wen & Wang, Hui-Jun & Liu, Hong-Jie, 2007. "Activated fly ash/slag blended cement," Resources, Conservation & Recycling, Elsevier, vol. 52(2), pages 303-313.
    • Handle: RePEc:eee:recore:v:52:y:2007:i:2:p:303-313
    DOI: 10.1016/j.resconrec.2007.04.002
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    Cited by:

    1. Lijun Sun & Yan Feng & Daolin Wang & Chongchong Qi & Xuemin Zeng, 2022. "Influence of CaO on Physical and Environmental Properties of Granulated Copper Slag: Melting Behavior, Grindability and Leaching Behavior," IJERPH, MDPI, vol. 19(20), pages 1-12, October.

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