10 April 2008 Acoustic emission monitoring of externally bonded FRP-reinforced concrete
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Debonding of externally bonded carbon fiber reinforced polymer (CFRP) materials used for repair of reinforced elements is commonly observed and is often the critical limit state for such systems. This paper presents an acoustic emission (AE) study performed during laboratory tests of concrete slab specimens strengthened with CFRP strips. Several specimens having different bf/s ratio (ratio of CFRP width-to-CFRP spacing) were monitored. An AE paradigm to monitor damage initiation, progression, and location in the test specimens is demonstrated. An algorithm to classify the cracks in concrete, the disbond of the CFRP strips from the soffit of the slab, and the eventual failure (debonding or concrete shear) is also presented. The proposed general approach can be applied to large scale CFRP-concrete systems. The results presented here are part of a broader study, conducted at the University of Pittsburgh, aiming at characterizing the structural response and the debonding behavior of reinforced concrete strengthened with CFRP.
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Sandeep Degala, Piervincenzo Rizzo, Karthik Ramanathan, and Kent A. Harries "Acoustic emission monitoring of externally bonded FRP-reinforced concrete", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69351G (10 April 2008); doi: 10.1117/12.775865; https://doi.org/10.1117/12.775865

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