Thermographic analysis of bond of FRP laminates applied on R.C. Beams

Title: Thermographic analysis of bond of FRP laminates applied on R.C. Beams
Author(s): M.R. Valluzzi, E. Grinzato, C. Pellegrino, P.G. Bison, R. Trentin
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 16
Language: English

Abstract: Non destructive control by the use of thermographic analyses has a very high potential to check the effectiveness of strengthening and repair intervention on structural components, both in buildings and bridges, in particular when innovative materials as FRP (Fiber Reinforced Polymer) are used. Experimental tests (both laboratory and in situ) are increasingly performed at different levels, to validate this procedure for possible detection of defects or imperfections which can led the component to brittle and unexpected collapse.
A research aimed at checking the efficiency of the bond at the interface between FRP laminates and reinforced concrete beams by using thermography has been carried out at the University of Padova in collaboration with the National Research Council (CNR). A series of beams (10 m long) have been tested under bending loads and strengthened conditions, by placing a pre-impregnated thin carbon (CFRP) laminate at the intrados. Different reinforcement configurations have been adopted in the beams (ordinary steel reinforcement and with addition of prestressed strands), using mechanical devices for the anchorage of the supplementary pre-tension of the strips. At local level, the simulation of possible lack of bonding during loading or intrinsic defects and imperfections, has been contextually analysed on specifically dimensioned samples.
The most significant results of the experimental tests and the mathematical elaborations obtained through the application of thermographic inspection on preliminary samples and full-scale beams are discussed in the paper.

Keywords: thermography, FRP, bond, PCA, defects, concrete

Online publication: 2006-08-02
Classification: 3.3 Theme 3: Monitoring, Repair and Maintenance of Concrete Structures
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.111