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Peer reviewed
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Zhang, Min; Deng, Mingke
Composite structures, 11/2022, Volume: 300Journal Article
•Fabric-to-matrix bond behavior in carbon FRCM with added short fibers was investigated by 75 pull-out tests.•The pullout force and toughness increased with the embedded length increased.•The characteristic parameter values were dependent on the type and volume content of short fibers.•The contribution of weft yarn was equivalent to the elastic response of a cantilever beam.•The trilinear bond-slip relationship considering the contribution of weft yarn can be obtained. Fabric reinforced cementitious matrix (FRCM) composites are promising composite materials with useful properties, such as non-toxicity, fire resistance, corrosion resistance, and vapor permeability. However, the brittle failure mode, fabric efficiency, and tensile strength of FRCM composites require further improvement. Accordingly, the addition of short fibers to the matrix is proposed to improve the mechanical properties of FRCM composites, which are highly influenced by the fabric-to-cementitious matrix bond behavior. The objective of this study is to investigate the fabric-to-cementitious matrix bond behavior in carbon FRCM composites with added short fibers and to propose a method to evaluate the bond parameters. In total, 75 pullout specimens were designed to investigate the effects of short fiber type, short fiber volume content, and embedded length on the fabric-to-cementitious matrix bond behavior using double-sided pullout tests. The experimental results were evaluated in terms of the peak pullout force, displacement at peak pullout force, toughness, average bond strength, and initial stiffness. A closed-form solution was presented for the pullout force-displacement relationship based on a trilinear bond-slip model that accounted for the contribution of weft yarn. Furthermore, a method for the analytical extraction of bond parameters was proposed using the main characteristics of the experimental pullout force-displacement responses.
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