FRP-to-Masonry Bond Durability Assessment with Infrared Thermography Method

The bond behavior between FRP composites and masonry substrate plays an important role in the performance of externally bonded reinforced masonry structures. Therefore, monitoring the bond quality during the application and subsequent service life of a structure is of crucial importance for executio...

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Bibliographic Details
Published inJournal of nondestructive evaluation Vol. 33; no. 3; pp. 427 - 437
Main Authors Ghiassi, Bahman, Silva, Sandra M., Oliveira, Daniel V., Lourenço, Paulo B., Bragança, Luís
Format Journal Article
LanguageEnglish
Published Boston Springer US 2014
Subjects
Characterization and Evaluation of Materials
Classical Mechanics
Control
Dynamical Systems
Engineering
Solid Mechanics
Vibration
Accelerated testing
Durability
Masonry
Bond
FRP
IR thermography
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Summary:The bond behavior between FRP composites and masonry substrate plays an important role in the performance of externally bonded reinforced masonry structures. Therefore, monitoring the bond quality during the application and subsequent service life of a structure is of crucial importance for execution control and structural health monitoring. The bond quality can change during the service life of the structure due to environmental conditions. Local detachments may occur at the FRP/substrate interface, affecting the bond performance to a large extent. Therefore, the use of expedite and efficient non-destructive techniques for assessment of the bond quality and monitoring FRP delamination is of much interest. Active infrared thermography (IR) technique was used in this study for assessing the bond quality in environmentally degraded FRP-strengthened masonry elements. The applicability and accuracy of the adopted method was initially validated by localization and size quantification of artificially embedded defects in FRP-strengthened brick specimens. Then, the method was used for investigating the appearance and progression of FRP delaminations due to environmental conditions. GFRP-strengthened brick specimens were exposed to accelerated hygrothermal ageing tests and inspected periodically with the IR camera. The results showed environmental exposure may produce large progressive FRP delaminations.
ISSN:0195-9298
1573-4862
DOI:10.1007/s10921-014-0238-8