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Hydration Characteristics and Formation Progress of Alinite Cement Prepared from Mswi Fly Ash
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1. Key Laboratory of Modern Civil Engineering Materials of Ministry of Education 2. Environmental Materials Research Institute of Tongji University
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Abstract Municipal Solid Waste Incineration (MSWI) fly ash was successfully used as raw material in sintering Alinite cement clinker in the laboratory. In this paper, formation progress of Alinite cement clinker, influence of gypsum on the hydration of alinite cement, hydration heat release rate, hydration product and its microstructure were studied. Results show that Alinite cement clinker can be sintered by using MSWI fly ash as a major raw material. During the sintering, C2S, C12A7 and C2S·CaCl2 was presented first,then make alinite cement clinker when react with MgO, CaCl2. Addition appropriate amount of gypsum can improve the early compressive strength and accelerate the hydration rate of Alinite cement, and the Alinite cement can be utilized as a kind of early-strength and rapid-hardening cement; Hydration product of Alinite cement not only includes CSH gel, AFt with clavate shapes and CH crystals which can be observed in Portland cement, but also has C3A·CaCl2·10H2O crystals.
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Received: 13 April 2010
Published: 22 June 2018
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