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Proceedings Paper

Crack detection and fatigue related delamination in FRP composites applied to concrete
Author(s): Jeff Brown; Rebecca Baker; Lisa Kallemeyn; Andrew Zendler
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Paper Abstract

Reinforced concrete beams are designed to allow minor concrete cracking in the tension zone. The severity of cracking in a beam element is a good indicator of how well a structure is performing and whether or not repairs are needed to prevent structural failure. FRP composites are commonly used to increase the flexural and shear capacity of RC beam elements, but one potential disadvantage of this method is that strengthened surfaces are no longer visible and cracks or delaminations that result from excessive loading or fatigue may go undetected. This research investigated thermal imaging techniques for detecting load induced cracking in the concrete substrate and delamination of FRP strengthening systems applied to reinforced concrete (RC). One small-scale RC beam (5 in. x 6 in. x 60 in.) was strengthened with FRP and loaded to failure monotonically. An infrared thermography inspection was performed after failure. A second strengthened beam was loaded cyclically for 1,750,000 cycles to investigate how fatigue might affect substrate cracking and delamination growth throughout the service-life of a repaired element. No changes were observed in the FRP bond during/after the cyclic loading. The thermal imaging component of this research included pixel normalization to enhance detectability and characterization of this specific type of damage.

Paper Details

Date Published: 17 March 2008
PDF: 10 pages
Proc. SPIE 6939, Thermosense XXX, 69390W (17 March 2008); doi: 10.1117/12.777665
Show Author Affiliations
Jeff Brown, Hope College (United States)
Rebecca Baker, Hope College (United States)
Lisa Kallemeyn, Hope College (United States)
Andrew Zendler, Hope College (United States)


Published in SPIE Proceedings Vol. 6939:
Thermosense XXX
Vladimir P. Vavilov; Douglas D. Burleigh, Editor(s)

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