Bond behaviour of deformed steel bars in steel fibre high-strength self-compacting concrete

Majain, Nelly; Rahman, Atiqur; Adnan, Azlan; Mohamed, Roslli Noor

doi:10.1016/j.conbuildmat.2021.125906

Cited by 26 publications

(8 citation statements)

References 33 publications

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“…The pullout failure mode is shown in Figure 5 . The failure modes of the bond specimen mainly include splitting failure, pullout failure, and splitting–pullout failure according to the previous studies [ 39 , 50 , 51 ]. Moreover, the failure mode is affected by the confinement condition, such as the concrete cover and transverse reinforcement.…”

Section: Resultsmentioning

confidence: 99%

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Liu

Dou

et al. 2022

Materials

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In order to evaluate the influence of freeze–thaw action on the durability of concrete structures, this paper presentedan experimental study to investigate the effects of freezing–thawing cycles and concrete strength on the bond behavior between steel bars and concrete confined with stirrups. Through freeze–thaw cycles and center pullouttests, the failure mode of pullout specimen, concrete strength, mass loss, dynamic elastic modulus, and bond–slip curves were analyzed. At last, the bond–slip constitutive model was proposed for specimens with stirrup confinement under freeze–thaw action. Main test results indicate that the failure mode and shape of bond–slip curves are affected by stirrups. The bond strength hasa certain increase after 100 freeze–thaw cycles owing to the constraining force from stirrups, whereasthe splitting tensile strengthsignificantly declines. After 100 freeze–thaw cycles, the splitting tensile strength of C20 and C40 decreased by40.8% and 46.5%, respectively. The formula was provided to calculate the bond strength of constrained concrete after freeze–thaw cycles, and the damage coefficient and other related parametersin the formula were suggested. The predicted bond–slip curves are close to the experimental results, which could provide reference for the related research of bond performance after freeze–thaw action.

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Section: Resultsmentioning

confidence: 99%

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Liu

Dou

et al. 2022

Materials

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“…The authors of article [ 48 ] presented the next step in the study of SFRC materials. They described the results of pullout tests on rebar while the concrete was additionally reinforced with steel fibers.…”

Section: Discussionmentioning

confidence: 99%

Application of X-ray Computed Tomography to Verify Bond Failures Mechanism of Fiber-Reinforced Fine-Grain Concrete

et al. 2022

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This paper proposes the use of X-ray computed tomography (µCT, xCT) measurements together with finite element method (FEM) numerical modelling to assess bond failures mechanism of fiber-reinforced fine-grain concrete. Fiber-reinforced concrete is becoming popular for application in civil engineering structures. A dynamically developing topic related to concretes is the determination of bond characteristics. Nowadays, modern technologies allow inspecting the inside of the element without the need to damage its structure. This paper discusses the application of computed tomography in order to identify damage occurring in the structure of fiber-reinforced fine-grain concrete during bond failure tests. The publication is part of a larger study to determine the bonding properties of Ukrainian steel fibers in fine-grain concrete. The authors focused on the visual evaluation of sections obtained from tomographic data. Separately, the results of volumetric analysis were presented to quantitatively assess the changes occurring in the matrix structure. Finite element analysis is an addition to the substantive part and allows us to compare real damage areas with theoretical stress concentration areas. The result of the work is the identification of a path that allows verification of the locations where matrix destruction occurs.

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“…Cui et al [23] noted that heat-cured GPC and OPC pull-out specimens comprising a plain bar exhibited pull-out failure, whereas pull-out specimens reinforced with deformed steel bars exhibited splitting of the concrete matrix failure. Majain et al [24] investigated the influence of varying bar diameters (12 mm, 16 mm, and 20 mm) on the bond stress of steel hooked end fiberreinforced high-strength self-compacting concrete. The study noted that an addition of 1% steel fibers changed the mode of failure from splitting failure to pull-out failure.…”

Section: Introductionmentioning

confidence: 99%

Bond Stress Behavior of a Steel Reinforcing Bar Embedded in Geopolymer Concrete Incorporating Natural and Recycled Aggregates

Khan,

Akbar,

Qazi

et al. 2024

Infrastructures

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The rise in greenhouse gases, particularly carbon dioxide (CO2) emissions, in the atmosphere is one of the major causes of global warming and climate change. The production of ordinary Portland cement (OPC) emits harmful CO2 gases, which contribute to sporadic heatwaves, rapid melting of glaciers, flash flooding, and food shortages. To address global warming and climate change challenges, this research study explores the use of a cement-less recycled aggregate concrete, a sustainable approach for future constructions. This study uses fly ash, an industrial waste of coal power plants, as a 100% substitute for OPC. Moreover, this research study also uses recycled coarse aggregates (RCAs) as a partial to complete replacement for natural coarse aggregates (NCAs) to preserve natural resources for future generations. In this research investigation, a total of 60 pull-out specimens were prepared to investigate the influence of steel bar diameter (9.5 mm, 12.7 mm, and 19.1 mm), bar embedment length, (4 and 6), and percentage replacements of NCA with RCA (25%, 50%, 75%, and 100%) on the bond stress behavior of cement-less RA concrete. The test results exhibited that the bond stress of cement-less RCA concrete decreased by 6% with increasing steel bar diameter. Moreover, the bond stress decreased by 5.5% with increasing bar embedment length. Furthermore, the bond stress decreased by 7.6%, 7%, 8.8%, and 20.4%, respectively, with increasing percentage replacements (25%, 50%, 75%, and 100%) of NCA with RCA. An empirical model was developed correlating the bond strength to the mean compressive strength of cement-less RCA concrete, which matched well with the experimental test results and predictions of the CEB-FIP model for OPC. The CRAC mixes exhibited higher costs but significantly lower embodied CO2 emissions than OPC concrete.

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Bond behaviour of deformed steel bars in steel fibre high-strength self-compacting concrete

Cited by 26 publications

References 33 publications

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Application of X-ray Computed Tomography to Verify Bond Failures Mechanism of Fiber-Reinforced Fine-Grain Concrete

Bond Stress Behavior of a Steel Reinforcing Bar Embedded in Geopolymer Concrete Incorporating Natural and Recycled Aggregates

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