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| Research On Concrete Damage Detection under Stray Current Environment Based on Ground Penetrating Radar |
| Cai Zhichao1,2,3, Yu Yiru2, Zhang Jing2 |
1. State Key Laboratory of Rail Transit Infrastructure Performance Testing and Guarantee East China Jiaotong University Nanchang 330013 China;
2. School of Electrical and Automation Engineering East China Jiaotong University Nanchang 330013 China;
3. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China |
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Abstract Due to the incomplete insulation of the running rail to the ground, stray current leakage occurs during subway operation, which leads to electrochemical corrosion of reinforced concrete structure along the subway. The purpose of this study is to study the electrochemical corrosion of steel bars and the evolution of concrete damage caused by stray current, and to detect cracks caused by corrosion damage of reinforced concrete by ground penetrating radar (GPR).
Firstly, a two-dimensional reinforced concrete model was established. Then, in order to more realistically simulate the evolution of cracks in reinforced concrete due to reinforcement corrosion, a tertiary current distribution, Nernst-Plank interface, is added to simulate electrochemical corrosion of reinforcement induced by external oxygen, in which oxygen diffuses from the left surface of the concrete to the interior. At the same time, solid mechanics physical field is added to simulate the strain of reinforcement and concrete due to reinforcement corrosion. Secondly, based on the multi-physics method, the two-dimensional transient simulation of the electrochemical corrosion process of reinforced concrete is studied, and the approximate actual corrosion damage map of reinforced concrete structure under different service times is obtained. Then, the obtained damage map was transformed by gray scale, and the corresponding electrical parameters (relative permeability, conductivity and relative permeability) were assigned to different media regions (concrete, steel bars and cracks) in the damage map. Finally, based on the ground penetrating radar numerical forward simulation method, the damage map after gray level change was simulated by A-scan and B-scan.
The evolution of concrete damage caused by electrochemical corrosion of rebar during 0~3 800 days in service time was studied. Only when the expansion stress generated by the corrosion products is greater than the tensile strength of the concrete, the cracks will appear in the concrete around the rebar and gradually expand to the surrounding areas, and the distribution of cracks gradually changes from uniform distribution to uneven distribution. During service, the maximum thickness of the corrosion products of the rebar is only about 18.5 μm, and the maximum reduction in the radius of the rebar is only about 8.5 μm. The results of A-scan forward modeling of GPR on the obtained damage map show that the increase of the thickness of steel corrosion products and the decrease in the radius of rebars have little influence on the detection signal of GPR, and the degree of crack expansion is directly related to the degree of electrochemical corrosion of the rebar, and the reflected signal of the crack can be used as the basis for evaluating the damage degree of concrete. At the same time, the B-scan forward modeling results of GPR show that the hyperbola formed by the reflected wave signal of the rebar has no obvious change when there is no crack. When the cracks appear, the reflected wave signal strength of cracks is higher than that of the rebar, and with the increase of service time, the hyperbolic peak value of the reflected wave of cracks decreases gradually. Finally, the influence of different factors on the crack reflection signal is studied. The results show that when the crack is evenly distributed, the higher the degree of the electrochemical corrosion of the reinforcement, the larger the peak value of the crack reflected wave and the shorter the propagation time.
The conclusion of this paper shows that the increase of corrosion product thickness and the decrease of radius of reinforcement have little influence on the detection signal of GPR during the process of electrochemical corrosion of reinforced concrete, and the concrete cracks caused by expansion stress play a major role in the influence of GPR detection signal.
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Received: 10 October 2023
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2024, Vol. 39 
