Structural Engineering and Mechanics

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Flexural behavior of reinforced recycled aggregates concrete beam after exposed to high temperatures

  • Longshou Qin (College of Civil Engineering and Architecture, Guangxi University) ;
  • Xian Li (College of Civil Engineering and Architecture, Guangxi University) ;
  • Ji Zhou (College of Civil Engineering and Architecture, Guangxi University) ;
  • Ying Liang (College of Architecture and Civil Engineering, Nanning University) ;
  • Wangsheng Ou (College of Architecture and Civil Engineering, Nanning University) ;
  • Zongping Chen (College of Civil Engineering and Architecture, Guangxi University)
  • Received : 2023.04.24
  • Accepted : 2023.06.22
  • Published : 2023.08.10
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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 600℃, 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.

Keywords

Acknowledgement

This research was sponsored by the National Natural Science Foundation of China through Grant No. 51578163, the Bagui Scholars Special Funding Project through Grant No. 2019[79], and the Guangxi Science and Technology Base and Talent Special Project through Grant No. AD21075031. It was also partially supported by the Projects Funded by the Central Government to Guide Local Scientific and Technological Development through Grant No. ZY21195010. The financial support is highly appreciated.

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