Enhancement of the cementitious properties of steelmaking slag |
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| Affiliation: | 1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;1. Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore;2. Structural Engineering Research Division, Korea Institute of Civil engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, South Korea;1. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia, Department of Materials Science, Bilbao, Spain;2. Department of Civil, Environmental and Architectural Engineering, University of Padova, Padova, Italy;3. Department of Industrial Engineering, University of Padova, Padova, Italy;1. Sustainable Materials Management, VITO, Mol, 2400, Belgium;2. XRE nv, Gent, Belgium;1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;1. Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100022, China;2. Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan 467036, China |
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| Abstract: | The overall objective of this work was to determine whether steel slag might be processed into a sufficiently cementitious material to allow it to be recycled as an additive to ordinary Portland cement clinker. Steel slag has limited cementitious properties due to both a lack of tricalcium silicate and the presence of wustite solid solutions as a predominant mineral phase. This work explores the effects of Fe oxidation state, overall composition, and cooling rate on the mineral structure, crystalline formation, and glass forming ability of several synthetic slags and one commercial BOF slag. XRD, SEM, and EDX analyses were performed on both slow cooled and quenched slags which had been oxidized. The granulated slag product was blended with Portland cement in varying ratios and hydrated to form cylindrical compression specimens. By controlling certain slag processing conditions, specifically the oxidation of bivalent iron and the quenching rate of the molten slag, the cementitious nature of the material is enhanced. This allows the material to be blended with Portland cement (at additions of up to 20% by weight), without affecting the strength and performance of the material. |
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