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<p>To investigate the effect of steel corrosion on bond degradation in underwater reinforced concrete (RC) structures, 18 RC specimens were prepared and subjected to three kinds of tests. Electrochemical corrosion was applied with target corrosion ratios of 3%, 6%, 9%, 12%, and 15%. Subsequently, underwater ultrasonic tests were performed to obtain corresponding wave velocities, followed by pull-out tests to evaluate bond strength. On the basis of these results, a bond-slip model incorporating ultrasonic velocity was developed to characterize bond behavior between corroded steel bars and concrete. The proposed finite element model was validated against experimental data from this work and prior studies, and further compared with existing models. The results show that the ultrasonic wave velocity in underwater specimens shows a positive correlation with the corrosion ratio. Failure mode shifts from splitting to pull-out as corrosion intensifies. The peak bond stress, the slip at peak bond stress, and the bond toughness all exhibit a trend of initial increase under slight corrosion. Underwater pull-out specimens exhibit superior bond performance compared to the terrestrial ones. Moreover, most of the predicted values from the model in this paper are lower than the experimental results, with deviations not exceeding 15%. These findings demonstrate that the proposed bond-slip model considering the corrosion of embedded steel bars can effectively predict bond performance, which can be used to optimize the design of underwater RC structures by reducing construction costs and extending service life.</p>

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Bond-slip model of underwater RC structures based on ultrasonic corrosion testing

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Shaofei Jiang,
  • Huilun Hua,
  • Wei Wang,
  • Yifeng Deng,
  • Shengxian Wang

摘要

To investigate the effect of steel corrosion on bond degradation in underwater reinforced concrete (RC) structures, 18 RC specimens were prepared and subjected to three kinds of tests. Electrochemical corrosion was applied with target corrosion ratios of 3%, 6%, 9%, 12%, and 15%. Subsequently, underwater ultrasonic tests were performed to obtain corresponding wave velocities, followed by pull-out tests to evaluate bond strength. On the basis of these results, a bond-slip model incorporating ultrasonic velocity was developed to characterize bond behavior between corroded steel bars and concrete. The proposed finite element model was validated against experimental data from this work and prior studies, and further compared with existing models. The results show that the ultrasonic wave velocity in underwater specimens shows a positive correlation with the corrosion ratio. Failure mode shifts from splitting to pull-out as corrosion intensifies. The peak bond stress, the slip at peak bond stress, and the bond toughness all exhibit a trend of initial increase under slight corrosion. Underwater pull-out specimens exhibit superior bond performance compared to the terrestrial ones. Moreover, most of the predicted values from the model in this paper are lower than the experimental results, with deviations not exceeding 15%. These findings demonstrate that the proposed bond-slip model considering the corrosion of embedded steel bars can effectively predict bond performance, which can be used to optimize the design of underwater RC structures by reducing construction costs and extending service life.