Impact Factor Analysis Of Internal Reinforcement Corrosion Detection Of Bridge With Electromagnetic Pulsed Eddy Current Method

Reinforcement corrosion is the main factor that affects the durability of reinforced concrete bridges,so it is particularly important to detect the corrosion of steel bars in concrete bridge regularly.The electromagnetic pulse eddy current thermal imaging technology is an effective non-destructive technology to obtain the degree of steel bars corrosion inside of bridges,but the factors affecting the accuracy of the detection technology are numerous.Therefore,with the help of theoretical analysis and experimental verification,the laws which influence this detection technology and which are influenced by some key factors like the diameter of bar,thickness of protective layer and concrete humidity are analyzed in this paper,providing a basis for further research on the electromagnetic pulse eddy current thermography detection.The main contents of this paper include:?Through the review of the relevant research literature at home and abroad,including the analysis of some applications like non-destructive detection technology in bridges and infrared thermal imaging technology in the field of civil engineering and research status on electromagnetic pulse eddy current thermal imaging technology,the factors affecting the detection accuracy of the technology applied in practical engineering are obtained.? The test of the degree of bare steel bars corrosion was completed by electromagnetic pulse eddy current thermal imaging.The results show that in the case of electromagnetic pulse eddy current induction heating,the heat efficiency and the surface temperature growth rate of corroded bars is greater and faster than of no corrosion.Moreover,with the increase of corrosion,the surface temperature rate continues to increase more.?The test of the degree of the reinforcement corrosion in the reinforced concrete specimens was completed by electromagnetic pulse eddy current thermography.The results show that the bare steel and reinforced concrete specimens have the same rule,that is,with the increase of the degree of corrosion,the concrete surface temperature increases.At the same time,the test of reinforced concrete specimens with different diameters,different thicknesses of protective layer and different concrete humidity was completed.Based on the experimental data,the key factors above affecting the growth rate of concrete surface temperature were analyzed and compared.?The laws of the growth rate of concrete surface temperature influenced by the diameter of steel bar,thickness of protective layer and concrete humidity are analyzed through transient thermal simulation in ANSYS.And the corrosion degree model of the electromagnetic pulse eddy current thermal imaging for detection of bars is established and the quantization method for the corrosion degree of reinforcement corrosion is determined through the rate ratio between the surface temperature of corroded reinforced concrete and that not corroded specimen.The test results show that the method can accurately and effectively determine the degree of corrosion inside the reinforced concrete.In this paper,through the analysis of the laws and key factors affecting the electromagnetic pulse eddy current thermal imaging to detect the corrosion degree detection technology,the quantization method for the degree of corrosion is proposed using the rate ratio between the surface temperature of corroded reinforced concrete and that not corroded specimen,providing a useful experiment and research foundation for further application of this technology in practical bridge detection.