Analytical and experimental investigation of the bond behavior of confined high-strength recycled aggregate concrete

Zhang, Jianwei; Tao, Xinyi; Li, Xiangyu; Zhang, Yunyi; Liu, Yujun

doi:10.1016/j.conbuildmat.2021.125636

Cited by 29 publications

(7 citation statements)

References 47 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%

“…In addition, studies of the effects of stirrups on bond behavior between different types of bars and concrete were conducted by researchers [ 38 , 39 ]. The experimental and analytical results indicated that the stirrup could maintain the constraint effect on the reinforcement after the splitting crack occurred, thereby increasing the bond strength [ 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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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“…It was noted that the bond stress significantly decreased with increasing percentage replacements of NCA with RCA from 0% to 100% for all diameters of reinforcing steel bars and embedment lengths. In the available literature, Zhang et al [46], and Jiang et al [47] reported that increasing percentage replacements of NCA with RCA tend to decrease the bond stress. Firstly, RCA possesses weaker mechanical characteristics compared to NCA, which leads to reduced interfacial bonding between the aggregates and the surrounding concrete matrix.…”

Section: Influence Of Percentage Replacements Of Nca With Rcamentioning

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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“…The beam test is an ideal bonding test method. The specimens commonly used in the beam test are divided into three types : (a) full-beam specimens with two half-beams connected by steel hinges [23,24] (Fig. 3).…”

Section: Fig 1 Schematic Illustration Of a Concentricpullout Specimenmentioning

confidence: 99%

A Review of the Bond Behavior between Concrete and Deformed Rebar

Fan

2022

JERR

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As a composite structure, the most important performance of the reinforced concrete structure is the bond behavior between them. Good bond behavior is the key to ensuring the service performance of reinforced concrete structures, which affects the performance of the structure at various stages in its life cycle. However, in the actual structural analysis, it is generally believed that the two do not produce relative slips, resulting in some differences between the analyzed structure and the actual engineering situation. At present, many scholars all over the world have used different test methods, comprehensively considered various factors affecting the bond behavior between deformed rebar and concrete, and obtained many conclusions. In this paper, based on the relevant research results of many scholars, starting from the bond mechanism, the experimental research method of the bond behavior, and the influencing factors of the bond behavior, a detailed review of the research status of the bonding performance of reinforced concrete is carried out. It is hoped that it can provide a reference to scholars that will study the bond behavior of reinforced concrete in the future.

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Analytical and experimental investigation of the bond behavior of confined high-strength recycled aggregate concrete

Cited by 29 publications

References 47 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

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

A Review of the Bond Behavior between Concrete and Deformed Rebar

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