Behaviour of concrete-filled steel tubular columns incorporating fly ash |
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| Affiliation: | 1. Department of Civil Engineering, Shantou University, Shantou 515063, China;2. State Key Laboratory of Concrete Material Research, Tongji University, Shanghai 200092, China;1. Delft University of Technology, Delft, The Netherlands;2. Deltares, Delft, The Netherlands;1. Department of Electrical, Electronic, and Information Engineering, University of Bologna, Italy;2. Department of Civil, Environmental and Materials Engineering - DICAM, University of Bologna, Italy;3. Department of Physics, Goethe University of Frankfurt am Main, Germany;4. Institute of Fluid Flow Machinery, Polish Academy of Sciences, Poland;1. Research Scholar, Department of Civil Engineering, Indian Institute of Technology, Roorkee, 247667, India;2. Professor, Department of Civil Engineering, Aligarh Muslim University, Aligarh, 202002, India;1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China;3. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;5. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Durability Center for Civil Engineering, Shenzhen University, Shenzhen 518060, China;6. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;7. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;1. Delft University of Technology, Stevinweg 1, Delft 2628 CN, The Netherlands;2. Deltares, Boussinesweg 1, Delft 2629 HV, The Netherlands |
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| Abstract: | The subject of this work is to investigate the effect of fly ash on the strength of concrete filled steel tubular columns from 28 to 365 days. A contrast study was carried out on concrete filled steel tubular columns incorporating 10–40 wt% fly ash, and for control Portland cement concrete filled steel tubular columns. The effect of pre-coating the inner surface of steel tubes with a thin layer of fly ash was also studied. Assessments of the concrete mixes were based on the compressive strength and the bond strength. The results show that a lower replacement with fly ash can improve both bond strength and compressive strength, while a higher replacement with fly ash requires a relatively longer time to achieve similar beneficial effects. Pre-coating the inner surface of steel tubes with a thin layer of fly ash can notably improve the bond strength. The microstructure of the interface between concrete and steel tube was also studied by using scanning electron microscopy analyzer. |
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