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Computers and Concrete Volume 29, Number 5, May 2022 , pages 323-334 DOI: https://doi.org/10.12989/cac.2022.29.5.323 |
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The combined reinforcement to recycled aggregate concrete by circular steel tube and basalt fiber |
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Xianggang Zhang, Songpeng Zhang, Xu Chen, Xiang Gao and Chunheng Zhou
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| Abstract | ||
| In order to study the axial compression performance of basalt-fiber reinforced recycled concrete (BFRRC) filled circular steel tubular short columns, the axial compression performance tests of seven short column specimens were conducted to observe the mechanical whole-process and failure mode of the specimens, the load-displacement curves and the load-strain curves of the specimens were obtained, the influence of design parameters on the axial compression performance of BFRRC filled circular steel tubular short columns was analyzed, and a practical mathematical model of stiffness degradation and a feasible stress-strain curve equation for the whole process were suggested. The results show that under the axial compression, the steel tube buckled and the core BFRRC was crushed. The load–axial deformation curves of all specimens show a longer deformation flow amplitude. Compared with the recycled coarse aggregate (RCA) replacement ratio and the basalt fiber dosage, the BFRRC strength has a great influence on the peak bearing capacity of the specimen. The RCA replacement ratio and the BFRRC strength are detrimental to ductility, whereas the basalt fiber dosage is beneficial to ductility. | ||
| Key Words | ||
| axial compression; basalt fiber; circular steel tube; mechanical properties; recycled aggregate concrete; stress-strain curve | ||
| Address | ||
| Xianggang Zhang: School of Intelligent Construction, Wuchang University of Technology, Wuhan 430223, China; School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China Songpeng Zhang: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Zhejiang Geophysical Technology Application Research Institute Co., Ltd., Hangzhou 310000, China Xu Chen: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China Xiang Gao: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China Chunheng Zhou: School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China | ||