Synthesis of low-temperature calcium sulfoaluminate-belite cements from industrial wastes and their hydration: Comparative studies between lignite fly ash and bottom ash |
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| Affiliation: | 1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, 50200, Thailand;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, 999077, Hong Kong;3. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineer, Khon Kaen University, 40002, Thailand;4. Materials Science Research Center, Faculty of Science, Chiang Mai University, 50200, Thailand;5. *Department of Industrial Chemistry, Faculty of Science, Chiang Mai University, 50200, Thailand;1. Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga, Spain;2. Grupo del Cemento y Materiales de Construcción, CEMATCO, Universidad Nacional de Colombia, Facultad de Minas, Medellín, Colombia;3. ALBA Synchrotron, Carrer de la Llum 2-26, E-08290, Cerdanyola del Vallès, Barcelona, Spain;1. Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Minerals and Metallurgical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå SE-971 87, Sweden;3. School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan 750021, China |
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| Abstract: | The aim of this research was to study the production of calcium sulfoaluminate-belite (CŜAB) cement from industrial waste materials via hydrothermal-calcination process. Lignite fly ash and bottom ash were used as starting materials for comparison. Other waste materials viz., Al-rich sludge and flue gas desulfurization gypsum were also key players in raw mixes for the synthesis of CŜAB cement. For lignite fly ash as a starting material, mixed phases between ye'elimite and larnite were obtained, whereas for lignite bottom ash as starting material, only ye'elimite was obtained The hydration reaction was studied in terms of heat evolution, setting time, compressive strength and hydration product formation with various gypsum contents. The results showed a rapid formation of ettringite as a main hydration product mixed with calcium silicate hydrate, monosulfate and strätlingite phases as minority, with a fast final setting time of 24–26 min and high early compressive strength of 16.0 and 18.0 MPa in 1 day for CŜAB cements made of fly ash and bottom ash, respectively. |
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| Keywords: | Calcium-sulfoaluminate-belite cement Hydrothermal-calcination method Lignite fly ash Bottom ash Hydration |
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