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
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.
Surface Roughness, CFRP-Concrete, GFRP-Concrete, SCCB, Fracture, Fatigue
Paper ID: STP45527S