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Computers and Concrete Volume 27, Number 4, April 2021 , pages 385-393 DOI: https://doi.org/10.12989/cac.2021.27.4.385 |
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Numerical model for local corrosion of steel reinforcement in reinforced concrete structure |
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Xuandong Chen, Qing Zhang, Ping Chen and Qiuqun Liang
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| Abstract | ||
| Reinforcement corrosion is the main cause of the durability failure of reinforced concrete (RC) structure. In this paper, a three-dimensional (3D) numerical model of macro-cell corrosion is established to reveal the corrosion mechanisms of steel reinforcement in RC structure. Modified Direct Iteration Method (MDIM) is employed to solve the system of partial differential equations for reinforcement corrosion. Through the sensitivity analysis of electrochemical parameters, it is found that the average corrosion current density is more sensitive to the change of cathodic Tafel slope and anodic equilibrium potential, compared with the other electrochemical parameters. Furthermore, both the anode-to-cathode (A/C) ratio and the anodic length have significant influences on the average corrosion current density, especially when A/C ratio is less than 0.5 and anodic length is less than 35 mm. More importantly, it is demonstrated that the corrosion rate of semi-circumferential corrosion is much larger than that of circumferential corrosion for the same A/C ratio value. The simulation results can give a unique insight into understanding the detailed electrochemical corrosion processes of steel reinforcement in RC structure for application in service life prediction of RC structures in actual civil engineer. | ||
| Key Words | ||
| reinforcement corrosion; corrosion current density; macro-cell model; modified direct iteration method | ||
| Address | ||
| Xuandong Chen: College of Mechanics and Materials, Hohai University, Nanjing, 211100, People's Republic of China;College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China;Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, People's Republic of China Qing Zhang: College of Mechanics and Materials, Hohai University, Nanjing, 211100, People's Republic of China Ping Chen: College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China;Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, People's Republic of China Qiuqun Liang: College of Science, Guilin University of Technology, Guilin, 541004, People's Republic of China | ||