Activated fly ash/slag blended cement |
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Authors: | Feng-Qing Zhao Wen Ni Hui-Jun Wang Hong-Jie Liu |
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Institution: | aChemical Technology School, Hebei University of Science & Technology, Shijiazhuang 050018, PR China;bCivil and Environmental Engineering School, Beijing University of Science & Technology, Beijing 100083, PR China |
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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 0.5–1.5 h, 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 3500 cm2/g, 15% further ground to around 5000 cm2/g. The compressive strength of 28 days of the cement mortar is up to 49 MPa and flexural strength 8.4 MPa. The hydration products, investigated by SEM and X-ray diffraction, are mainly ettringite and C–S–H gel. |
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Keywords: | Waste recycling Fly ash Granulated blast-furnace slag Cementing material Alkali activated |
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