Activated fly ash/slag blended cement

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

Resources, Conservation & Recycling, 2007, vol. 52, issue 2, 303-313

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.

Keywords: Waste recycling; Fly ash; Granulated blast-furnace slag; Cementing material; Alkali activated (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:recore:v:52:y:2007:i:2:p:303-313

DOI: 10.1016/j.resconrec.2007.04.002

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