Effect of Ca/Si ratio on the properties of steel slag and deactivated ZSM-5 autoclaved aerated concrete |
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| Institution: | 1. College of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng, 22400, China;2. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the Peopole’s Republic of China, Nanjing, 210042, China;3. China United Concrete Xuzhou Co., Ltd, Xuzhou, 221000, China;4. College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China;5. School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, 224002, China;6. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing, 100024, China;7. Central Research Institute, Baosteel, Fujin Road, 201999, Shanghai, China |
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| Abstract: | In this study, the feasibility of the complete replacement of lime by steel slag (SS) as a calcium material with deactivated ZSM-5 for the preparation of autoclaved aerated concrete (AAC) was investigated. The effects of the Ca/Si ratio on the foaming effect, bulk density and mechanical strength, mineral composition, pore structure and microstructure were studied. The results show that the increase of the Ca/Si ratio enhanced the early foaming effect. AAC with an optimum Ca/Si ratio of 0.92 had a compressive strength and bulk density of 3.1 MPa and 535 kg/m3, respectively, meeting the national standards (GB/T 11968-2020) of grade A2.5 and B05. The increase of the Ca/Si ratio significantly reduced the number of pores with a pore size greater than 60 μm. In addition, X-ray diffraction (XRD) and scanning electron microscopy (SEM) results show that an elevated Ca/Si ratio will change the shape and crystallinity of tobermorite. |
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| Keywords: | Autoclaved aerated concrete Steel slag Ca/Si ratio Tobermorite |
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