Computers and Concrete

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Assessment of shear resistance of corroded beams repaired using SFRC in the tension zone

  • Jongvivatsakul, Pitcha (Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Laopaitoon, Phattarakan (Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Nguyen, Yen T.H. (Faculty of Civil Engineering, Industrial University of Ho Chi Minh City) ;
  • Nguyen, Phuoc T. (Faculty of Civil Engineering, Ho Chi Minh City Open University) ;
  • Bui, Linh V.H. (Faculty of Civil Engineering, Ho Chi Minh City Open University)
  • Received : 2020.05.08
  • Accepted : 2021.03.16
  • Published : 2021.05.25
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Abstract

This study experimentally and analytically investigates the shear behavior of corroded reinforced concrete (RC) beams repaired using steel fiber-reinforced concrete (SFRC) in the flexural zone. The experimental parameters are the corrosion degree (0%, 12%, and 17%) and the steel fiber volume in the SFRC (1.0%, 1.5%, and 2.0%). The test results reveal that corrosion degree significantly affects the shear resistance of the beams. The shear capacity of the beam with the corrosion degree of 17% was higher than that of the uncorroded beam, whereas the shear capacity of the beam with the corrosion degree of 12% was lower than that of the uncorroded beam. The shear efficiency of damaged beams can be recovered by repairing them using SFRC that contains a reasonable amount of steel fibers. In addition, two methods to estimate the shear capacity of the repaired beams are developed using the modified truss analogy and strut-and-tie models. The estimated shear capacity of the beam using the modified truss analogy model agrees well with the experimental data.

Keywords

Acknowledgement

This research was funded by the Program Management Unit for Human Resources & Institutional Development, Research and Innovation - CU [Grant number B16F630071] and the Asahi Glass Foundation. The fourth author and fifth author would also like to acknowledge the partial financial support provided by Ho Chi Minh City Open University.

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