Steel and Composite Structures

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Assessment of concrete macrocrack depth using infrared thermography

  • Bae, Jaehoon (Department of Architectural Design, College of Engineering Science, Chonnam National University) ;
  • Jang, Arum (School of Civil, Environmental, and Architectural Engineering, Korea University) ;
  • Park, Min Jae (School of Civil, Environmental, and Architectural Engineering, Korea University) ;
  • Lee, Jonghoon (School of Civil, Environmental, and Architectural Engineering, Korea University) ;
  • Ju, Young K. (School of Civil, Environmental, and Architectural Engineering, Korea University)
  • Received : 2021.12.24
  • Accepted : 2022.04.23
  • Published : 2022.05.25
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Abstract

Cracks are common defects in concrete structures. Thus far, crack inspection has been manually performed using the contact inspection method. This manpower-dependent method inevitably increases the cost and work hours. Various non-contact studies have been conducted to overcome such difficulties. However, previous studies have focused on developing a methodology for non-contact inspection or local quantitative detection of crack width or length on concrete surfaces. However, crack depth can affect the safety of concrete structures. In particular, although macrocrack depth is structurally fatal, it is difficult to find it with the existing method. Therefore, an experimental investigation based on non-contact infrared thermography and multivariate machine learning was performed in this study to estimate the hidden macrocrack depth. To consider practical applications for inspection, an experiment was conducted that considered the simulated piloting of an unmanned aerial vehicle equipped with infrared thermography equipment. The crack depths (10-60 mm) were comparatively evaluated using linear regression, gradient boosting, and random forest (AI regression methods).

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2020R1A2C3005687, NRF-2021R1A5A1032433, No. NRF-2020R1A2C3005687, NRF-2021R1A5A1032433, NRF-2022R1C1C1003594).

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