15 May 2017 Study on evaluation of corrosion condition of reinforcing bar embedded concrete using infrared thermal imaging camera
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Abstract
Rapid aging of many concrete structures, which have been developed during rapid economic growth period in Japan, has become a serious problem for us these days. And thus, there is an urgent need to prolong their service life expectancies. For this purpose, the deterioration of reinforcing bars in the concrete structures should be detected quickly and correctly at the early stages. Nevertheless, conventional testing methods such as destructive and nondestructive testing have disadvantages: partial damages on concrete structures; difficulty with quantitative evaluation, etc.

Many preceding studies have examined to estimate the deterioration of reinforcing bars based on the temperature of the concrete specimen surfaces. According to those papers, the differences in corrosion degree of reinforcing bars have a certain effect on the temperature of concrete specimen surfaces.

In this study, firstly, the quantitative evaluation of the corrosion degree was conducted with 3D scanner which could measure the volume, coverage area and cross-sectional area. Secondly, the surface of the concrete specimen was cooled down with liquid nitrogen, and thirdly, thermographic change was observed up until the air temperature. Finally, the surface of the concrete specimen was detected clearly by the thermal images.

As a result, this study shows that the corrosion thickness tends to get bigger, following the uprising temperature of the concrete specimen surfaces. The same kind of tendency can be observed by the thermal images, too.
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Watanabe Ruiko, Watanabe Ruiko, Mizobuchi Toshiaki, Mizobuchi Toshiaki, } "Study on evaluation of corrosion condition of reinforcing bar embedded concrete using infrared thermal imaging camera", Proc. SPIE 10170, Health Monitoring of Structural and Biological Systems 2017, 101702N (15 May 2017); doi: 10.1117/12.2259951; https://doi.org/10.1117/12.2259951
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