SEDL / STP / STP1480-EB / STP45527S

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

Lawrence, Timothy O.
Research Assistant, The University of North Carolina at Charlotte, Charlotte, NC

Boyajian, David M.
Corresponding Author, Assistant Professor, The University of North Carolina at Charlotte, Charlotte, NC

Pages: 16    Published: Jan 2007

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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 μm), moderate- (≈ 10–50 μm), and high- (>50 μm), 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.