Mr. Seung Hoon Baek Profile

Seung Hoon Baek

at Univ of California Irvine

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Proceedings Article | 19 April 2011 Paper

Nondestructive corrosion detection in concrete through integrated heat induction and IR thermography

Seung-Jun Kwon, Henry Xue, Maria Feng, Seunghoon Baek

Proceedings Volume 7983, 79831R (2011) https://doi.org/10.1117/12.881121

KEYWORDS: Corrosion, Thermography, Radiation thermography, Infrared cameras, Nondestructive evaluation, Infrared imaging, Electromagnetism, Cameras, Infrared detectors, Infrared radiation

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Steel corrosion in concrete is a main cause of deterioration and early failure of concrete structures. A novel integration of electromagnetic heat induction and infrared (IR) thermography is proposed for nondestructive detection of steel corrosion in concrete, by taking advantage of the difference in thermal characteristics of corroded and non-corroded steel. This paper focuses on experimental investigation of the concept. An inductive heater is developed to remotely heat the steel rebar from concrete surface, which is integrated with an IR camera. Bare rebar and concrete samples with different cover depths are prepared. Each concrete sample is embedded with a single steel rebar in the middle, resulting an identical cover depth from the front and the back surfaces, which enables heat induction from one surface and IR thermogrphay from the other simultaneously. The impressed current method is adopted to induce accelerated corrosion on the rebar. IR video images are recorded during both heating and cooling periods. The test results demonstrate a clear difference in thermal characteristics between corroded and non-corroded samples. The corroded samples show higher rates of heating and cooling as well as a higher peak IR intensity than those of the non-corroded samples. This study demonstrates a potential for nondestructive detection of rebar corrosion in concrete.

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