Abstract
This study introduces an eddy current thermography technique that can be used to detect and evaluate steel corrosion in a reinforced concrete structure. The rate of surface temperature changes in reinforced concrete is proposed as a means to characterize the degree of steel bar corrosion. The rate of surface temperature changes increased gradually with an increase in the corrosion degree. The influence of structural parameters on the rate of the temperature change was analyzed in detail. The results indicated that the rate of surface temperature change increased with a decrease in the concrete cover depth and with an increase in the humidity of the concrete, and this was affected by the diameter of the internal steel bar. Concrete cover was the most significant factor that affected the rate of the surface temperature change, except for the corrosion degree. The variations in the surface temperature of reinforced concrete can be explained using the law of electromagnetic induction and the electrochemical property change of corroded steel bar. This research provides a reliable basis for real-world applications and is helpful to understand the application scope of eddy current thermography technology for the quantitative detection of steel corrosion.
Highlights
Reinforced concrete structures are frequently used in bridge engineering due to their excellent mechanical and durability properties [1,2,3]
A few groups have investigated corrosion in steel bars based on eddy current thermography, and they have found that the temperature of a steel bar is dependent on the corrosion degree of the specimens [24,25,26,27]
Preparation of the Samples ree series of reinforced concrete specimens were fabricated to investigate steel bar corrosion detection based on eddy current thermography. e influence of the diameter of steel bar, the concrete humidity, and the concrete cover depth on temperature variations will be discussed. e width, height, and length of each of the concrete block specimens was 100 mm × 100 mm × 400 mm, and C40 concrete was chosen to make the specimens. e depths (C) of the upper layers of the concrete in the three series of specimens were 2 cm, 3 cm, and 5 cm, and a schematic is shown in Figures 1(a) and 1(b)
Summary
Reinforced concrete structures are frequently used in bridge engineering due to their excellent mechanical and durability properties [1,2,3]. A large amount of research work has been conducted and many nondestructive testing methods have been proposed to detect steel corrosion in reinforced concrete [7]. A few groups have investigated corrosion in steel bars based on eddy current thermography, and they have found that the temperature of a steel bar is dependent on the corrosion degree of the specimens [24,25,26,27]. The eddy current thermography technique is applied to detect steel corrosion in a concrete structure by employing an infrared thermal camera, and the influence of the structure parameters on the surface temperature of the reinforced concrete is discussed in detail. 2. Preparation of the Samples ree series of reinforced concrete specimens were fabricated to investigate steel bar corrosion detection based on eddy current thermography. Bare steel bars with the same diameters were corroded using the same process
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