Experimental techniques for measuring fibre/matrix interfacial bond shear strength

Gray, Robert

doi:10.1016/0143-7496(83)90094-5

Cited by 34 publications

(7 citation statements)

References 6 publications

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“…Several test setups have been used in the literature for investigating the bond behavior between fibers and brittle matrices (such as epoxy resin or concrete), see e.g. [21][22][23][24][25][26]. One-sided or doublesided pull-out tests are among the most conventional methods.…”

Section: Single Fiber-to-mortar Bond Behaviormentioning

confidence: 99%

Multi-level characterization of steel reinforced mortars for strengthening of masonry structures

et al. 2016

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Textile Reinforced Mortars (TRMs) have received extensive attention for externally bonded reinforcement of historical and masonry structures. Despite this recent attention, the available information on the test methods and mechanical performance of TRMs at different scales are limited. Extensive experimental results are still necessary for development of design formulas and application guidelines. This paper presents a multi-level experimental investigation on the performance of Steel Reinforced Grouts (SRGs) as a common TRM type. The focus is not only on the mechanical characterization but also the test methods and practical challenges. The tests include materials characterization, fiber-to-mortar bond characterization, tensile tests on TRM composite, and TRM-to-masonry bond characterization tests. The tests are performed on three different SRG systems made of pozzolanic lime-based and geopolymeric-based mortars as sustainable matrices for strengthening and restoration applications.

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Section: Single Fiber-to-mortar Bond Behaviormentioning

confidence: 99%

Multi-level characterization of steel reinforced mortars for strengthening of masonry structures

et al. 2016

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“…the fibre matrix bond. The bond of an aligned hooked-end fibre embedded in a cementitious matrix is ascribed to three bond mechanisms, that partly overlap during the pull-out process of hooked-end fibres: the adhesive bond, and the mechanical and frictional bond [7,8]. After the utilization of the adhesive bond, at displacement values of approx.…”

Section: Introductionmentioning

confidence: 99%

Pull-out behaviour of steel fibres in cracked concrete under wet–dry cycles – deterioration phenomena

Marcos-Meson

Solgaard

Skovhus

et al. 2021

Magazine of Concrete Research

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This paper presents observations and results of an experimental investigation on the mechanisms altering the pull-out behaviour of partially pulled hooked-end steel fibres inside an artificial crack exposed to wet-dry cycles for six months. Mechanical and corrosion damage at the surface of the steel fibre were investigated by 3D optical interferometric profiling and petrographic analyses to describe mechanical damage and healing processes at the matrix surrounding the fibre. Mechanical damage observed in the cementitious matrix and at the fibre confirmed that, after debonding, the pull-out process was governed by yielding of the fibre hook, fracture of the adjacent matrix and friction between the hook and the matrix. The partial restoration of the adhesive bond after exposure was attributed to a combination of autogenous healing around the fractured fibrematrix interface and accumulation of corrosion products around the intersection of the fibre with the crack. The increase of the mechanical bond strength was ascribed to autogenous healing processes at the mechanically damaged matrix around the fibre hook. Results of this study support the hypothesis that the increase of the pull-out force transferred by hooked-end steel fibres bridging cracks in concrete exposed to wet-dry cycles is mainly related to autogenous healing and carbonation of the damaged matrix around the fibre than corrosion damage of the steel.

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“…The studied factors include matrix composition, fiber shape, fiber inclination angle, fiber embedment length, curing condition, and use of micro fibers [4,5,19]. Generally, the pullout testing can be classified into single-sided and double-sided testing in terms of the methods of applying tensile force and/or fiber embedment [20]. The single-sided testing is relatively simple to be carried out.…”

Section: Introductionmentioning

confidence: 99%

Influence of silica fume content on microstructure development and bond to steel fiber in ultra-high strength cement-based materials (UHSC)

Shi

Khayat

2016

Cement and Concrete Composites

284

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The use of silica fume can significantly enhance mechanical properties of concrete given its beneficial filling and pozzolanic effects. In this study, a simple and effective double-side pullout testing method was adopted to characterize the interfacial bond properties, which include pullout load-slip relationship, bond strength, and pullout energy, of steel fiber-matrix in ultra-high strength cement-based material (UHSC) with 0-25% silica fume by the mass of binder. The effects of silica fume content on flowability, heat of hydration, compressive and flexural strengths, hydration products, and pore structure of matrix at different curing time were evaluated as well. Backscatter scanning electron microscopy (BSEM) and micro-hardness measurement were used to examine the quality of interfacial transition zone (ITZ) around the fiber. In terms of the results, the optimal silica fume content could be in the range of 15%-25%. UHSC mixtures with these dosages of silica fume showed significant improvement in pullout behavior. Its bond strength and pullout energy at 28 d could increase by 170% and 250% compared to the reference samples without any silica fume. The microstructural observation verified the findings on the macro-properties development. Formation of more and higher strength of hydration products and refinement of ITZ around the fiber ensured higher micro-hardness, and thus increased the bond to fiber.

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Experimental techniques for measuring fibre/matrix interfacial bond shear strength

Cited by 34 publications

References 6 publications

Multi-level characterization of steel reinforced mortars for strengthening of masonry structures

Multi-level characterization of steel reinforced mortars for strengthening of masonry structures

Pull-out behaviour of steel fibres in cracked concrete under wet–dry cycles – deterioration phenomena

Influence of silica fume content on microstructure development and bond to steel fiber in ultra-high strength cement-based materials (UHSC)

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