STP1480

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

    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.

    Keywords:

    Surface Roughness, CFRP-Concrete, GFRP-Concrete, SCCB, Fracture, Fatigue


    Author Information:

    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


    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP45527S


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