Low-reactive circulating fluidized bed combustion (CFBC) fly ashes as source material for geopolymer synthesis |
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| Authors: | Hui Xu Qin Li Lifeng Shen Mengqun Zhang Jianping Zhai |
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| Institution: | 1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China;2. Center of Modern Analysis, Nanjing University, Nanjing 210093, PR China;1. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, South Korea;2. University of Science and Technology, Daejeon 305-350, South Korea;3. Curtin University, Perth, Western Australia 6845, Australia;4. Maritime Security Research Center, Korea Institute of Ocean Science and Technology, Ansan 426-744, South Korea;5. Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon 305-333, South Korea;1. Institute of Resilient Infrastructure, School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom;2. Faculty of Science and Engineering, University of Wolverhampton, Wulfruna Street, Wolverhampton WV1 1LY, United Kingdom;1. Department of Architectural Engineering and Design, University of Engineering and Technology, Lahore, Pakistan;2. Department of Civil and Environmental Engineering, Yonsei University, Seoul, Republic of Korea;1. School of Civil Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;2. Department of Civil Engineering, Shanghai Jiao Tong University and State Key Laboratory of Ocean Engineering, 800 Dongchuang Rd., Shanghai 200240, China;1. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;2. Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand |
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| Abstract: | In this contribution, low-reactive circulating fluidized bed combustion (CFBC) fly ashes (CFAs) have firstly been utilized as a source material for geopolymer synthesis. An alkali fusion process was employed to promote the dissolution of Si and Al species from the CFAs, and thus to enhance the reactivity of the ashes. A high-reactive metakaolin (MK) was also used to consume the excess alkali needed for the fusion. Reactivities of the CFAs and MK were examined by a series of dissolution tests in sodium hydroxide solutions. Geopolymer samples were prepared by alkali activation of the source materials using a sodium silicate solution as the activator. The synthesized products were characterized by mechanical testing, scanning electron microscopy (SEM), X-ray diffractography (XRD), as well as Fourier transform infrared spectroscopy (FTIR). The results of this study indicate that, via enhancing the reactivity by alkali fusion and balancing the Na/Al ratio by additional aluminosilicate source, low-reactive CFAs could also be recycled as an alternative source material for geopolymer production. |
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