Load-induced debonding of FRP composites applied to reinforced concrete

Joel Blok; Jeff Brown

doi:10.1117/12.818991

22 April 2009 Load-induced debonding of FRP composites applied to reinforced concrete

Joel Blok, Jeff Brown

Proceedings Volume 7299, Thermosense XXXI; 72990Q (2009) https://doi.org/10.1117/12.818991
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

Fiber-reinforced polymer (FRP) composites are widely used to increase the flexural and shear capacity of reinforced concrete (RC) elements. One potential disadvantage 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 monitoring and evaluating load-induced delamination of FRP composites applied to small scale RC beams. Two beams (3.5 in x 4.5 in x 58 in) were loaded monotonically to failure. Infrared thermography (IRT) inspections were performed at various load levels through failure using a composite phase imaging technique. Two similar beams were tested in fatigue and periodic IRT inspections were performed at 50,000-cycle intervals. Individual phase values for each pixel were designated as "well-bonded", "suspect" or "unbonded" to indicate the quality of FRP bond. Suspect areas included regions of excess thickened-epoxy tack-coat and smaller installation defects in the unloaded specimens. The long-term objective of this research is to develop a practical framework for conducting quantitative IRT inspections of FRP composites applied to RC and incorporating these results into acceptance criteria for new installations and predictions for the remaining service life of in-service FRP systems. This method may also offer insight into the necessity for repairs to in-service systems.

Citation Download Citation

Joel Blok and Jeff Brown "Load-induced debonding of FRP composites applied to reinforced concrete", Proc. SPIE 7299, Thermosense XXXI, 72990Q (22 April 2009); https://doi.org/10.1117/12.818991

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KEYWORDS

Fiber reinforced polymers

Composites

Thermography

Inspection

Phase shifts

Lamps

Interfaces

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