The importance of the network-modifying element content in fly ash as a simple measure to predict its strength potential for alkali-activation |
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| Affiliation: | 1. School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan Metropolitan City 689-798, South Korea;2. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA;1. School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulju-gun, Ulsan, 689-798, Republic of Korea;2. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulju-gun, Ulsan, 689-798, Republic of Korea;3. Research & Development Division, Hyundai Engineering & Construction Co., Ltd., 102-4, Mabuk-dong, Giheung-gu, Yongin-si, Gyeonggi-do, 446-716, Republic of Korea;4. Technical Research Center, Environment Technology Development, Hyundai Steel Company, R&D Center, 167-32, Kodae-Ri, Songak-Myeon, Dangjin-Gun, Chungnam, Republic of Korea;1. Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China;2. Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China;3. Jiangsu Subote New Materials Ltd. Co., Nanjing 211103, China;1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. Institute on Concrete and Eco-Materials, China University of Mining and Technology, Beijing 100083, China |
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| Abstract: | Six different Class F fly ashes were examined to identify the material properties that determine the strength development in geopolymerization. All of the fly ashes displayed typical features of Class F fly ash in chemical and mineral composition, amorphous phase (glass) content, and X-ray diffraction pattern profile; however, the strength developments of the ashes were quite different from each other. The results suggest that the strength is higher under the following configuration: greater content of network modifying elements, greater glass content, lower silicon content, lower intensity of quartz-related 29Si NMR peak, and higher fraction of Al(IV) in the 27Al NMR spectrum. Among the possibilities, the network-modifying elemental content may be the simplest and most accurate measure for strength development of alkali activation of fly ash. |
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| Keywords: | Fly ash Alkali-activation Network-modifying element XRF XRD NMR |
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