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Journal of Intelligent Construction 2023, 1(3): 9180019 https://doi.org/10.26599/JIC.2023.9180019
Research Article | Open Access | Issue | Published: 21 September 2023

Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Show Author's Information Xiaoxu Zhu( ),  Hiroyuki Abe,  Daiske Hayashi,  Hirokazu Tanaka
Institute of Technology, Shimizu Corporation, Tokyo 135-8530, Japan
Keywords:
corrosion model, non-uniform corrosion, reinforced concrete (RC) beams, diameter-loss measurement, mass-loss measurement, spatial variability factor (R')
Cite this article:
Zhu X, Abe H, Hayashi D, et al. Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement. Journal of Intelligent Construction, 2023, 1(3): 9180019. https://doi.org/10.26599/JIC.2023.9180019
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Abstract Full text About this article

This study investigated the behavior of a non-corroded reinforced concrete (RC) beam and two RC beams with non-uniform corrosion (whole span and side span) in a four-point bending test. The corrosion distributions of the tensile steel rebars were measured by two methods: diameter loss and mass loss. The peak values of corrosion distribution in the diameter-loss measurements were much greater than those in the mass-loss measurements. However, the average corrosion according to the diameter measurements was smaller than that in the mass-loss measurements. The corrosion distribution trends were the same in the two methods, indicating good measurement accuracy. From the bending test results, it appears that increasing corrosion area and corrosion ratios reduce the beams’ stiffness, yielding capacity, and ultimate capacity. All three specimens had similar failure patterns: steel yielding followed by compression failure of the concrete. A nonlinear three-dimensional (3D) analysis model that considered the non-uniform corrosion of the rebars was established and verified by experimental data. The model’s predictions for stiffness, ultimate capacity, and failure patterns were consistent with experimental results. The spatial variability factor (R'), which is the ratio of the maximum corrosion ratio (γmax) to the average corrosion ratio (γave), was adopted to quantify the non-uniformity of the corrosion distribution in this study.


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About this article

Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Show Author's information Xiaoxu Zhu( ), Hiroyuki Abe, Daiske Hayashi, Hirokazu Tanaka
Institute of Technology, Shimizu Corporation, Tokyo 135-8530, Japan

Abstract

This study investigated the behavior of a non-corroded reinforced concrete (RC) beam and two RC beams with non-uniform corrosion (whole span and side span) in a four-point bending test. The corrosion distributions of the tensile steel rebars were measured by two methods: diameter loss and mass loss. The peak values of corrosion distribution in the diameter-loss measurements were much greater than those in the mass-loss measurements. However, the average corrosion according to the diameter measurements was smaller than that in the mass-loss measurements. The corrosion distribution trends were the same in the two methods, indicating good measurement accuracy. From the bending test results, it appears that increasing corrosion area and corrosion ratios reduce the beams’ stiffness, yielding capacity, and ultimate capacity. All three specimens had similar failure patterns: steel yielding followed by compression failure of the concrete. A nonlinear three-dimensional (3D) analysis model that considered the non-uniform corrosion of the rebars was established and verified by experimental data. The model’s predictions for stiffness, ultimate capacity, and failure patterns were consistent with experimental results. The spatial variability factor (R'), which is the ratio of the maximum corrosion ratio (γmax) to the average corrosion ratio (γave), was adopted to quantify the non-uniformity of the corrosion distribution in this study.

Keywords: corrosion model, non-uniform corrosion, reinforced concrete (RC) beams, diameter-loss measurement, mass-loss measurement, spatial variability factor (R')

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Publication history

Received: 01 August 2023
Revised: 14 August 2023
Accepted: 15 August 2023
Published: 21 September 2023
Issue date: September 2023

Copyright

© The Author(s) 2023. Published by Tsinghua University Press.

Acknowledgements

The authors sincerely appreciate Prof. T. Ishida of The University of Tokyo, Prof. N. Chijiwa of Tokyo Institute of Technology, and Prof. K. Maekawa of Yokohama National University for fruitful discussion and suggestions.

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The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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