Surface Roughness, Quasi-static Fracture and Cyclic Fatigue Effects on GFRP and CFRP-Concrete Bonded Interfaces

Lawrence TO, Boyajian DM
(Received 27 April 2005; accepted 13 July 2005)
JOURNAL JAI
Abstract
The recently developed experimental fracture approach known as the Single Contoured-Cantilever Beam (SCCB) was used to characterize the interface bonds between concrete substrates and two varieties of FRP: glass and carbon (abbreviated GFRP and CFRP, respectively). Limited research has been performed concerning the FRP-concrete interface bond relative to three surface-roughness grades: low- (<10 mm), moderate- (»10–50 mm), and high- (>50 mm), to establish the optimal formation for bonding. By use of the SCCB approach, Mode I critical strain energy release rate results are measured and quantified. Finally, considering that a majority of externally strengthened FRP concrete structures involves bridges and girders that are subjected to repeated (as opposed to static) loads, a preliminary study is conducted on cyclically fatigued FRP-concrete interfaces under varying load-ratio and frequency effects.

Keywords:
CFRP concrete, cyclic fatigue, fatigue, fracture, fracture mechanics, GFRP concrete, quasi-static fracture, SCCB, surface roughness

Paper ID: JAI13188
DOI: 10.1520/JAI13188

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Title: Surface Roughness, Quasi-static Fracture and Cyclic Fatigue Effects on GFRP and CFRP-Concrete Bonded Interfaces Symposium: Fatigue and Fracture Mechanics: 35th Volume, 2005-5-20
Committee: E08 on Fatigue and Fracture