Laboratory investigation of carbonated BOF slag used as partial replacement of natural aggregate in cement mortars |
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| Affiliation: | 1. KU Leuven, Department of Chemical Engineering, 3001, Leuven, Belgium;2. “Dunarea de Jos” University of Galati, Department of Environmental Engineering and Metallurgical Technological Systems, 800201, Gala?i, Romania;3. Sheridan Institute of Technology, School of Applied Chemical and Environmental Sciences, Brampton, L6Y 5H9, Canada;4. KU Leuven, Department of Civil Engineering, 3001, Leuven, Belgium;5. KU Leuven, Department of Metallurgy and Materials Engineering, 3001, Leuven, Belgium;6. University of Guelph, School of Engineering, Guelph, N1G 2W1, Canada;1. Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 10673, Taiwan;2. Indian Institute of Technology, Roorkee, Uttarakhand 247667, India;3. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taiwan;4. School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong Province 510006, China;5. Carbon Cycle Research Center, National Taiwan University, Taipei 10673, Taiwan;1. Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Minerals and Metallurgical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå SE-971 87, Sweden;3. School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan 750021, China;1. Department of Civil Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada;2. Department of Materials and Mining Engineering, McGill University, 3610 University Street, Montreal, Quebec H3A 2B2, Canada |
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| Abstract: | Direct mineral carbonation produces a material rich in carbonates and with reduced quantities of free oxides. The aim of this work was to show that such materials can be used in the construction domain. Basic Oxygen Furnace (BOF) slag from the steelmaking process has been traditionally seen as unfit for bounded applications due to its propensity to swelling, resulting from hydration of its high free lime content. Here, BOF slag was crushed to suitable particle sizes, carbonated in an aqueous solution of carbonic acid, and utilized to replace 50% of natural sand aggregate in cement mortars. The mechanical and chemical properties of these mortars were compared to mortars containing non-carbonated slags, and a standard cement mortar as a reference. Tests were conducted to determine mortar paste consistency and soundness, and cured mortar compressive strength and leaching tendencies. The results showed a satisfactory performance for all considered aspects (comparable with the reference) of the mortar sample containing 37.5 wt% (1.5 in 4 parts solids) carbonated BOF slag of <0.5 mm particle size. |
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| Keywords: | BOF slag Mineral carbonation Fine aggregate Cement mortar Soundness Leaching |
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