Influence of embedment length on the pullout behavior of steel fibers from ultra-high-performance concrete

Yoo, Doo Yeol; Je, J. H.; Choi, Hong-Joon; Sukontasukkul, Piti

doi:10.1016/j.matlet.2020.128233

Cited by 40 publications

(9 citation statements)

References 10 publications

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“…When the length of the pulled-out fiber is up to 5 mm, the anchor part is pulled out of the matrix channel with friction. At these moments, the fiber is aligned (plastically deformed) [31][32][33]. At the fourth stage, the remaining fiber tail is pulled out.…”

Section: Fibers Pull-out Process Experimental Resultsmentioning

confidence: 99%

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Lūsis

Kononova

Mačanovskis

et al. 2021

Fibers

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The use of steel fiber reinforced concrete (SFRC) in structures with high physical-mechanical characteristics allows engineers to reduce the weight and costs of the structures, to simplify the technology of their production, to reduce or completely eliminate the manual labor needed for reinforcement, at the same time increasing reliability and durability. Commonly accepted technology is exploiting randomly distributed in the concrete volume fibers with random each fiber orientation. In structural members subjected to bending, major loads are bearing fibers located close to outer member surfaces. The majority of fibers are slightly loaded. The aim of the present research is to create an SFRC construction with non-homogeneously distributed fibers. We prepared layered SFRC prismatic specimens. Each layer had different amount of short fibers. Specimens were tested by four point bending till the rupture. Material fracture process was modelled based on the single fiber pull-out test results. Modelling results were compared with the experimental curves for beams. Predictions generated by the model were validated by 4PBT of 100 × 100 × 400 mm prisms. Investigation had shown higher load-bearing capacity of layered concrete plates comparing with plate having homogeneously distributed the same amount of fibers. This mechanism is strongly dependent on fiber concentration. A high amount of fibers is leading to new failure mechanisms—pull-out of FRC blocks and decrease of load-bearing capacity. Fracture surface analysis was realized for broken prisms with the goal to analyze fracture process and to improve accuracy of the elaborated model. The general conclusion with regard to modelling results is that the agreement with experimental data is good, numeric modelling results successfully align with the experimental data. Modelling has indicated the existence of additional failure processes besides simple fiber pull-out, which could be expected when fiber concentration exceeds the critical value.

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Section: Fibers Pull-out Process Experimental Resultsmentioning

confidence: 99%

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Lūsis

Kononova

Mačanovskis

et al. 2021

Fibers

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show abstract

“…The interaction between steel fibers and base matrix (e.g., concrete and UHPC) is through the interfacial bond, that is, the shearing stress at the interface between the fiber and the surrounding matrix 21 . The bond mechanism of steel fibers was studied by many researchers through single fiber pulling‐out tests 21–28 . The major contributors to bond strength are physical and mechanical adhesion, mechanical component of bond, and friction.…”

Section: Resultsmentioning

confidence: 99%

“…21 The bond mechanism of steel fibers was studied by many researchers through single fiber pulling-out tests. [21][22][23][24][25][26][27][28] The major contributors to bond strength are physical and mechanical adhesion, mechanical component of bond, and friction. Factors affecting bond behavior includes (i) fiber properties, such as fiber length, strength, surface condition, and shape, (ii) matrix properties, such as mix proportions and strength, and (iii) friction.…”

Section: Bond Strengthmentioning

confidence: 99%

Experimental study on the tensile behavior of ultra‐high performance concrete fiber continuous joints

Zhao

Huang

Yang

et al. 2022

Structural Concrete

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The application of ultra‐high performance concrete (UHPC) in the bridge deck effectively increases the strength, ductility, and durability of the deck system, while the problem of fiber discontinuity at the joint‐deck interface remains unsolved. This study proposes an innovative UHPC joint to create steel fiber continuity at the interface and experimentally investigates its tensile behavior. Test parameters include fiber content, fiber length and diameter, fiber shape, and fiber strength. Test results indicate that the joint tensile strength increases with fiber content, fiber length, and fiber strength. The specimen with hooked end fibers also develops higher joint tensile strength compared with the specimen with straight fibers. It is recommended to use fibers with a smaller diameter to increase the interfacial bonding area between the fibers and the matrix. High‐strength fibers are also recommended to achieve the best efficiency in a high‐strength matrix, like UHPC. The tensile performance of the joint with a fiber content of no less than 0.5%, and an embedment length of 15 mm (with a fiber length/diameter ratio of 50), and a diameter of 0.3 mm is similar to the performance of the specimen cast as one piece. Therefore, a properly designed UHPC fiber continuous joint is recommended in engineering practice to improve the integrity of the joint‐deck system.

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“…In general, the performance of FRC and FRG can be assessed through standardized tests such as ASTM C1609 [ 41 ], ASTM C1399 [ 42 ], or JSCE SF4 [ 43 ], which are based mainly on flexural testing. However, to investigate the fiber–matrix interaction, a so-called single fiber pullout test is more appropriate [ 40 , 44 , 45 ]. The graphene oxide (GO) solution was produced at a concentration of 10 mg/mL, and the incorporation rate of GO was 0.05% by weight of the binder.…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Oxide Nanoparticles on Bond-Slip Reponses between Fiber and Geopolymer Mortar

et al. 2022

Self Cite

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In this study, the influence of graphene oxide nanoparticles on the bond-slip behavior of fiber and fly-ash-based geopolymer paste was examined. Geopolymer paste incorporating a graphene oxide nanoparticle solution was cast in half briquetted specimens and embedded with a fiber. Three types of fiber were used: steel, polypropylene, and basalt. The pullout test was performed at two distinct speeds: 1 mm/s and 3 mm/s. The results showed that the addition of graphene oxide increased the compressive strength of the geopolymer by about 7%. The bond-slip responses of fibers embedded in the geopolymer mixed with graphene oxide exhibited higher peak stress and toughness compared to those embedded in a normal geopolymer. Each fiber type also showed a different mode of failure. Both steel and polypropylene fibers showed full bond-slip responses due to their high ductility. Basalt fiber, on the other hand, because of its brittleness, failed by fiber fracture mode and showed no slip in pullout responses. Both bond strength and toughness were found to be rate-sensitive. The sensitivity was higher in the graphene oxide/geopolymer than in the conventional geopolymer.

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Influence of embedment length on the pullout behavior of steel fibers from ultra-high-performance concrete

Cited by 40 publications

References 10 publications

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

Experimental study on the tensile behavior of ultra‐high performance concrete fiber continuous joints

Influence of Graphene Oxide Nanoparticles on Bond-Slip Reponses between Fiber and Geopolymer Mortar

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