Shrinkage and strength of alkaline activated ground steel slag/ultrafine palm oil fuel ash pastes and mortars |
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| Affiliation: | 1. School of Civil Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia;2. Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia;3. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia;1. University of Montenegro, Faculty of Metallurgy and Technology, DžordžaVašingtona bb, 81 000 Podgorica, Montenegro;2. University of Belgrade, Faculty of Mining and Geology, Laboratory of Crystallography, Đušina 7, 11000 Belgrade, Serbia;3. University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia;4. Innovation Center, University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia;5. University of Belgrade, Faculty of Physical Chemistry, Belgrade, Serbia;1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;2. School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;1. School of Resource and Environment Science, Wuhan University, 430070, Hubei, Wuhan, China;2. School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China;3. Hubei Environmental Remediation Material Engineering Technology Research Center, 430070 Hubei, Wuhan, China;4. Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan Textile University, Wuhan 430073, China;5. College of Mechanical Engineering, China University of Petroleum, 102249 Beijing, China;6. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Hubei, Wuhan 430010, China;1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China;3. School of Civil Engineering, Tianjin University, Tianjin 300350, China;4. Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China |
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| Abstract: | This study evaluated the contributions of steel slag and activators ratio to the shrinkage of the alkali-activated ground steel slag (G)/ultrafine palm oil fuel ash (U) or AAGU pastes and mortars. The base materials were combined such that G/U+G varied from 0 to 0.8 (pastes) and 0–0.6 (mortars) with the use of 10M-NaOHaq and Na2SiO3aq (Ms = SiO2/Na2O of 3.3) as activators whose ratios (Na2SiO3aq/10M NaOHaq) were varied as 1.0/1.0 and 2.5/1.0. The findings revealed that steel slag reduced the AAGU shrinkage through pore-refinement, elimination of microcracks, and improvement in the microstructural density and strength. The changing of Na2SiO3/10NaOH ratio in the synthesis of AAGU products from 2.5 to 1.0 slightly reduced the shrinkage through the modification of amorphousity and nature of the products (C-A-S-H/C-S-H). The maximum 90-day slag-free AAGU paste and mortar shrinkages were 60.80 × 103 με and 11.82 × 103 με but reduced to 25.88 × 103 and 2.71 × 103 με, respectively as G/(U+G) = 0.4 in AAGU0.4. |
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| Keywords: | Shrinkage Alkaline activated binder Palm oil fuel ash Steel slag Mortar Paste |
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