Intestigation of concrete structures with pulse phase thermography

The applicability of pulse phase thermography (PPT) for the investigation of structures is studied systematically on concrete test specimens and on a plastered sandstone column. In the test specimens, voids and delaminations are implemented in different depths and with different sizes, modelling rea...

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Bibliographic Details
Published in:Materials and structures 2005-11, Vol.38 (9), p.843-849
Main Authors: Weritz, F., Arndt, R., Röllig, M., Maierhofer, C., Wiggenhauser, H.
Format: Article
Language:English
Subjects:
Amplitudes
Building construction
Building materials
Civil engineering
Concrete
Concretes
Delaminating
Heating
Studies
Surface chemistry
Thermography
Voids
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Summary:The applicability of pulse phase thermography (PPT) for the investigation of structures is studied systematically on concrete test specimens and on a plastered sandstone column. In the test specimens, voids and delaminations are implemented in different depths and with different sizes, modelling real voids, honeycombing and debonding. Delaminations of plaster in concrete and masonry and behind tiles on concrete are investigated. PPT is based on the frequency analysis of the cooling down process of actively heated surfaces. Therefore, it is contactless and thus completely non-destructive (if overheating of the surface is prevented), fast and allows the inspection of large surface areas. The interpretation of amplitude and phase images gives semi-quantitative information about the observed defects. The phase images provide a deeper probing up to 10-15 cm in relation to the interpretation of the thermograms and to the amplitude images. In addition, the influence of surface inhomogeneities and non-uniform heating is reduced.[PUBLICATION ABSTRACT]
ISSN:1359-5997
1871-6873
DOI:10.1007/BF02481657