A Primary Investigation on Concrete Made from Iron and Steel Slags for Building Ecological Artifical Reefs |
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Authors: | Ni Wen Li Ying Chen Deping Wang Zhongjie |
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Affiliation: | Civil and Environmental Engineering School; Key Laboratory of High-Efficient Mining and Safety of Metal Mines Ministry of Education of China, University of Science and Technology Beijing, Beijing 100083,P.R.China;Civil and Environmental Engineering School; Key Laboratory of High-Efficient Mining and Safety of Metal Mines Ministry of Education of China, University of Science and Technology Beijing, Beijing 100083,P.R.China;Civil and Environmental Engineering School; Key Laboratory of High-Efficient Mining and Safety of Metal Mines Ministry of Education of China, University of Science and Technology Beijing, Beijing 100083,P.R.China;Civil and Environmental Engineering School; Key Laboratory of High-Efficient Mining and Safety of Metal Mines Ministry of Education of China, University of Science and Technology Beijing, Beijing 100083,P.R.China |
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Abstract: | A method of orthogonal test was used to optimize the strength of the cementitious material for preparing the concrete of high-strength artifical reefs.The results show that with the ratio of iron slag:steel slag=7:1,and when 10% cement clinker and 10% gypsum of Flue Gas Desulfurization Waste (FGDW) was mixed with 80% iron and steel slags powder,the mixed cementitious material had an optimized strength.The optimized specific surface area are 480 m 2/kg and 550 m 2/kg for iron slag and steel slag powder respectively.The ordinary portland cement can be totally substituted by such a mixed cementitious material with iron and steel slags as its major components in preparing the concrete for building high-strength artificial reefs.A concrete with a compressive strengh over 65MPa can be prepared by using such a mixture as a cementitious material and steel slag grains as its fine and coarse aggregats which have been stubilized by a hot-simmering method. Hydration processes of net slurry were analysized by XRD and SEM methods. The results show that the hydration products in the system are mainly AFt and C-S-H gel. The results also show that the pozzolanic reaction of iron slags could be largely promoted by the coordinations of steel slags,clinker and FGDW. |
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Keywords: | iron slags stel slags cementitious material concrete artificial reefs |
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