Detection of shallow voids in concrete structures with impulse thermography and radar

New thermography systems enable the application of active investigation techniques, i.e. the observation of the cooling down process after heating the surface of a structure under investigation. Defects like voids in concrete having a different thermal diffusivity in comparison to the bulk material...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2003-06, Vol.36 (4), p.257-263
Main Authors: Maierhofer, Ch, Brink, A, Röllig, M, Wiggenhauser, H
Format: Article
Language:English
Subjects:
Civil engineering
Concrete
Impulse thermography
Non-destructive testing
Radar
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Summary:New thermography systems enable the application of active investigation techniques, i.e. the observation of the cooling down process after heating the surface of a structure under investigation. Defects like voids in concrete having a different thermal diffusivity in comparison to the bulk material are visualised by different surface temperatures. The differences between temperature transient curves above sound regions and above inhomogeneities are expected to include information about the defect parameters. Experimental investigations with impulse thermography and radar on a concrete test specimen containing voids were analysed. Radar was used to determine the depth of the voids. The influence of size and depth of the voids on the temperature transient curves was studied for different heating times. The transient curves were also fitted with a simple semi-empirical model.
ISSN:0963-8695
1879-1174
DOI:10.1016/S0963-8695(02)00063-4