Investigation of concrete structures with pulse phase thermography

Title: Investigation of concrete structures with pulse phase thermography
Author(s): F. Weritz, R. Arndt, M. Röllig, C. Maierhofer, H. Wiggenhauser
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 38
Issue: 283
Issue date: 2005-11-01
Publication year: 2005
Pages: 843 - 849
Total Pages: 7
Nb references: 16
Language: English

Abstract: 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.

Online publication: 2005-03-09
Classification: Special Issue on Nondestructive Testing in Civil Engineering
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/14299