Effect of shale addition on properties of sintered coal fly ash |
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Authors: | Song Mu Bao-guo Ma Geert De Schutter Xiang-guo Li Yao-cheng Wang Shou-wei Jian |
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Affiliation: | 1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People’s Republic of China;2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent 9052, Belgium;3. School of Planning Architecturing and Civil Engineering, Queen’s University Belfast, BT9 5AG, UK |
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Abstract: | Shale can be used as a substitute for clay in sintered fly ash, due to the similar physical and chemical property to clay. In this paper, these characteristics of sintered fly ash with or without shale (binder) were investigated by physical property, X-ray diffraction and scanning electron microscopy. The results show that shale addition ranging from 30% to 50% (in weight) can be beneficial for properties of sintered products at temperature ranging from 950 to 1050 °C. However, a higher amount of shale easily caused significant bloating at 1100 °C. Considering energy saving and best performance, the sintering mix for shale and fly ash (50% in weight respectively, the same as below) fired at 1000 °C for 2 h was an optimal option. XRD results of the sintering mix show that intensity of hercynite increases with the increasing temperature, but intensity of quartz decreases on sintering. SEM confirms that addition of shale can improve microstructure and sintering of fly ash. |
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