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Proceedings Paper

Application of shearography to crack detection in concrete structures subjected to traffic loading
Author(s): V. Muzet; P. Blain; D. Przybyla
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Paper Abstract

Early detection of defects in concrete structures, such as bridges or dams, is essential to optimize the maintenance of civil engineering facilities. Optical methods constitute non-destructive means of control and measurement but they are generally confined in laboratories where both the setup and environnement are controlled. The method of shearography is especially well adapted to detect damages due to both its capacity to distinctly visualize strain concentration zones and its robustness. The experimental set-up is relatively compact, which enables to examine an extensive surface area by simply moving the shearographic head. In this paper, the application of this methodology for the detection of cracks is presented on concrete samples and circulated outside concrete structures. Due to its sensitivity to strain concentration, shearography is able to detect structural cracks, even when they were not through-cracks. Operational implementation is made on two circulated structures with experts in manual cracks detection. No stimulation device is used. In the first structure, cracks are detected on the bridge deck and on the bridge abutment. In the second structure, cracks on the intrados of the bridge deck are detected and also beginning of cracks which have not been detected by the visual inspection. Different areas are scanned and the results are in agreement with the visual inspection. This technique enables detecting cracks on structures subjected to traffic load. The natural loading of an engineering structure, i.e. the rolling traffic it bears, proves well suited for cracks detection by means of shearography, provided traffic patterns are regular enough.

Paper Details

Date Published: 13 September 2010
PDF: 8 pages
Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73870K (13 September 2010); doi: 10.1117/12.868951
Show Author Affiliations
V. Muzet, CETE de l'Est, LPRC de Strasbourg (France)
P. Blain, HOLOLAB, Univ. de Liège (Belgium)
D. Przybyla, CETE de l'Est, LPRC de Strasbourg (France)

Published in SPIE Proceedings Vol. 7387:
Speckle 2010: Optical Metrology
Armando Albertazzi Goncalves; Guillermo H. Kaufmann, Editor(s)

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