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A platform for research: civil engineering, architecture and urbanism
A novel clinkerization process for fly-ash utilization
The disposal of fly ash is a great demand in the environmental protection. Therefore, a novel hydrogel process using activated fly ash without using hydrothermal activation is described which was developed in India for manufacture of cement clinkers containing about 30 % fly ash . Starting with the activation of fly ash with 4.5 % NaOH solutions and subsequent heating to 350 deg C a hydrogel is prepared by reacting the activated fly ash with hydrated lime in an aqueous medium at room temperature. The dried gel was sintered in the temperature range from 1150 deg C to 1350 deg C to produce the cement clinker. The chemical and mineralogical composition of the clinker was analyzed by X-ray diffraction. Phases like C3S, C2S, C3A and C4AF are well developed with a good microstructure. The degree of crystallinity and the presence of quartz and mullite in the Indian fly ash is relatively high. The cement meets the Indian quality requirements according to Standards Specifications IS-269 for OPC 33-Grade and is comparable with the quality of cement with similar modulii values produced by conventional methods.
A novel clinkerization process for fly-ash utilization
The disposal of fly ash is a great demand in the environmental protection. Therefore, a novel hydrogel process using activated fly ash without using hydrothermal activation is described which was developed in India for manufacture of cement clinkers containing about 30 % fly ash . Starting with the activation of fly ash with 4.5 % NaOH solutions and subsequent heating to 350 deg C a hydrogel is prepared by reacting the activated fly ash with hydrated lime in an aqueous medium at room temperature. The dried gel was sintered in the temperature range from 1150 deg C to 1350 deg C to produce the cement clinker. The chemical and mineralogical composition of the clinker was analyzed by X-ray diffraction. Phases like C3S, C2S, C3A and C4AF are well developed with a good microstructure. The degree of crystallinity and the presence of quartz and mullite in the Indian fly ash is relatively high. The cement meets the Indian quality requirements according to Standards Specifications IS-269 for OPC 33-Grade and is comparable with the quality of cement with similar modulii values produced by conventional methods.
A novel clinkerization process for fly-ash utilization
Khadilkar, S.A. (author) / Karandikar, M.V. (author) / Ghosh, D. (author) / Chatterjee, A.K. (author)
1998
13 Seiten, 7 Bilder, 5 Tabellen, 3 Quellen
Conference paper
English
A Novel Clinkerization Process for Fly-Ash Utilization
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