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Article

Principal Component Thermography for Defect Detection in Concrete

Faculty of Civil Engineering, Department of Materials, Fra Andrije Kačića Miošića 26, University of Zagreb, 10000 Zagreb, Croatia
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Sensors 2020, 20(14), 3891; https://doi.org/10.3390/s20143891
Received: 9 June 2020 / Revised: 8 July 2020 / Accepted: 9 July 2020 / Published: 13 July 2020
(This article belongs to the Special Issue Thermography Sensing in Non-destructive Testing and Monitoring)
The goal of the condition assessment of concrete structures is to gain an insight into current condition of concrete and the existence of defects, which decrease durability and usability of the structure. Defects are quite difficult to detect using infrared thermography when concrete elements cannot be thermally excited with the Sun, together with unfavorable thermophysical properties of concrete structures. In this paper, principal component thermography (PCT) is applied as a post-processing method to a sequence of thermograms in order to enhance defect detectability in concrete structures. Defects are detected by analyzing a set of empirical orthogonal functions (EOFs), which were acquired by applying principal component analysis to a sequence of thermograms. The research was performed using concrete samples containing known defects, which were tested using a step heating thermography setup. The results of presented research show that PCT is an effective post-processing method to improve defect detection in concrete structures. By effectively improving the defect detection, PCT has a potential to improve the non-destructive testing (NDT) accuracy of using infrared thermography (IRT) on concrete structures, especially in shaded areas of such structures. The research also shows the defect detectability depending on concrete type thermal excitation setup and defect geometry. View Full-Text
Keywords: infrared thermography; concrete; principal component analysis; non-destructive testing; defect detection infrared thermography; concrete; principal component analysis; non-destructive testing; defect detection
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MDPI and ACS Style

Milovanović, B.; Gaši, M.; Gumbarević, S. Principal Component Thermography for Defect Detection in Concrete. Sensors 2020, 20, 3891. https://doi.org/10.3390/s20143891

AMA Style

Milovanović B, Gaši M, Gumbarević S. Principal Component Thermography for Defect Detection in Concrete. Sensors. 2020; 20(14):3891. https://doi.org/10.3390/s20143891

Chicago/Turabian Style

Milovanović, Bojan, Mergim Gaši, and Sanjin Gumbarević. 2020. "Principal Component Thermography for Defect Detection in Concrete" Sensors 20, no. 14: 3891. https://doi.org/10.3390/s20143891

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