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Structural Engineering and Mechanics Volume 87, Number 3, August10 2023 , pages 201-210 DOI: https://doi.org/10.12989/sem.2023.87.3.201 |
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Flexural behavior of reinforced recycled aggregates concrete beam after exposed to high temperatures |
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Longshou Qin, Xian Li, Ji Zhou, Ying Liang, Wangsheng Ou and Zongping Chen
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| Abstract | ||
| This paper investigates the flexural behavior of reinforced recycled aggregates concrete (RRAC) beams after exposed to high temperatures. The experimental results from 17 specimens were present and compared with temperatures, recycled coarse aggregate (RCA) replacement percentages, and concrete strength as variables. It was found that the high temperature would not cause an observable change in the failure pattern. However, high temperature can significantly reduce the stiffness and ductility, and accelerate the damage degradation of specimens. After exposure to 600oC, the ultimate bearing capacity of the specimens decreased by 20%-30% The mechanical properties of RRAC beams after high temperatures were barely impacted by the replacement percentages. Increasing the concrete strength of RCA could effectively improve the bearing capacity and peak deflection of RRAC beams after exposed to high temperatures. Furthermore, the calculation method of the bending bearing capacity and deflection of RRAC beams was also discussed. | ||
| Key Words | ||
| beams; flexural behavior; high temperature; recycled aggregates concrete | ||
| Address | ||
| Longshou Qin: College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, P.R. China; Guangxi Hualan Engineering Management Co., Ltd., Nanning, 530011, P.R. China Xian Li: College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, P.R. China Ji Zhou: College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, P.R. China Ying Liang: College of Architecture and Civil Engineering, Nanning University, Nanning, 530200, P.R. China Wangsheng Ou: College of Architecture and Civil Engineering, Nanning University, Nanning, 530200, P.R. China Zongping Chen: College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, P.R. China; College of Architecture and Civil Engineering, Nanning University, Nanning, 530200, P.R. China | ||