Effect of blended inorganic salts containing negative hydration ions on hydration and properties of alkali-activated slag cement |
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| Affiliation: | 1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China;2. School of Civil Engineering and Architecture, Xi''an University of Technology, Xi’an, 710048, China;1. Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan;2. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan;1. Department of Neutron Physics, Czech Academy of Sciences, Nuclear Physics Institute, Husinec-?e?, ?p. 130, 250 68 ?e?, Czech Republic;2. Department of Physics, Faculty of Science, J.E. Purkyně University, Pasteurova 3544/1, 400 96, Ústi Nad Labem, Czech Republic;3. Department of Inorganic Chemistry, University of Chemistry and Technology in Prague, 166 28, Prague, Czech Republic;4. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2026/5, 121 16, Prague 2, Czech Republic;5. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlá?ská 2, 61137, Brno, Czech Republic;6. Department of Material Analysis, FZU - Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21, Prague, Czech Republic;1. State Key Laboratory of Synthetical Automation for Process Industries, College of Information Science and Engineering, Northeastern University, Shenyang, 110819, China;2. Zhongtian Technology Advanced Materials Co.,Ltd, Nantong, 226009, China;3. Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China;1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai, 201800, China;4. Shanghai Academy of Spaceflight Technology, Shanghai, 201109, China;1. Department of Physics, The University of Lahore, 53700, Pakistan;2. Department of Physics, Science Unit, Deanship of Educational Services, Qasim University, Buraidah, 51452, Saudi Arabia;3. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia;4. Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia |
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| Abstract: | Water glass (WG) is generally considered to be the most effective activator to prepare alkali-activated slag (AAS) cement in terms of strength and durability. However, the rapid setting and hardening of WG activated slag results in rapid loss of fluidity of AAS concrete mixture, which limits its engineering application. In the paper, the effect of blended inorganic salts containing negative hydration ions on the fluidity, setting time and mechanical strength of AAS cement was studied. The hydration process and hydration products were used to explore the action mechanism. Ba(NO3)2 greatly delayed the hydration of AAS cement. The four inorganic salts (KCl, KNO3, KBr and NaCl) blended with a small amount of Ba(NO3)2 can improve both the initial fluidity and fluidity retention, and a wide setting time range can be obtained to meet engineering requirements. The compressive strength decreased with the increase of inorganic salts. The incorporation of inorganic salt did not change the composition of the main hydration products. Considering the fluidity required by construction, mechanical properties and the durability of structure, it is recommended to add 4%–5% KBr or KNO3 blended with no more than 0.2% Ba(NO3)2 into AAS cement. |
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| Keywords: | Alkali-activated slag cement Inorganic salt Fluidity Setting time Hydration heat evolution Low-carbon cementitious material |
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