Bond degradation of rebar and concrete confined with corroded stirrups: effects of concrete grade and casting position

Zhou, Haijun; Qiao, Mu; Du, Yingang; Liu, Jian; Zhou, Yifan; Mo, Yeqiang; Xing, Feng; Zhao, Yangping

doi:10.1680/jmacr.21.00122

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…Corrosion products do not diffuse rapidly into concrete pores because of the excellent resistance to permeability in high-strength concrete. Therefore, the accumulation of expansive products around the rebar leads to more significant induced crack widths, leading to a more severe deterioration of the bond strength [ 42 , 43 ].…”

Section: Bond Strength Deterioration Due To Corrosionmentioning

confidence: 99%

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Syll

Kanakubo

2022

Materials

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Corrosion of the reinforcement affects more than the cross-sectional area of the rebar. The volume of steel also increases due to expansive corrosion products, leading to the cracking, delamination, and spalling of concrete. As a result, the bond capacity between concrete and rebar is affected. Researchers have extensively examined the impact of corrosion on the bond strength between concrete and rebar to propose empirical, theoretical, or numerical predictive models. Therefore, research programs on this topic have increased rapidly in recent years. This article presents a systematic literature review to explore experimental methods, outcomes, and trends on this topic. The Web of Science search collected 84 relevant research articles through a rigorous selection. Key factors that affect bond strength degradation, including concrete cover, concrete strength, and stirrups, have been documented. However, a general model is still unavailable due to discrepancies caused by differences in testing methods to evaluate the effect of corrosion on bond strength. Furthermore, researchers attempted to clarify the degradation mechanism of bond strength affected by corrosion. As a result, new alternatives have been proposed to build a practical model to assess the bond strength deterioration of corroded structures.

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Section: Bond Strength Deterioration Due To Corrosionmentioning

confidence: 99%

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Syll

Kanakubo

2022

Materials

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“…The above models did not consider the influence of stirrups, but Feng et al [10] noted that the existence of stirrups could significantly improve the bonding strength of a specimen and thus change the failure mode of a specimen. Zhou et al [11] believe that a small degree of stirrup corrosion is beneficial to bonding strength, and the influence of stirrup corrosion on bonding performance is different in concrete with different strength grades. Based on the pull-out test, Lin et al [12] proposed a bonding strength degradation model that accounted for multiple coupling factors, such as longitudinal reinforcement corrosion, stirrup corrosion and stirrup spacing, but it did not account for the influence of concrete strength, resulting in deviations in the prediction results.…”

Section: Introductionmentioning

confidence: 99%

Influence of Corrosion on the Bond–Slip Behaviour between Corroded Bars and Concrete

Zhao,

Ying,

et al. 2023

Materials

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Pull-out tests were conducted to investigate the effects of corrosion of both the longitudinal bars and stirrups on the bond slip behaviour of reinforced concrete specimens. The main experimental variables include concrete strength (26.7 MPa, 37.7 MPa and 45.2 MPa) and expected corrosion loss (0%, 4%, 8% and 12%), with a total of 63 specimens fabricated. The results show that the relative bonding strength of specimens under different concrete strengths gradually decreases with increasing corrosion loss, but the higher the concrete strength is, the faster its degradation rate. The influence of stirrup corrosion on the peak slip can be ignored, but it will further aggravate the degradation of the bonding strength of the specimens. This reduction in bonding strength is linearly related to the stirrup corrosion loss. Based on the experimental results of this work and the achievements of other scholars, a modified relative bonding strength degradation model and a bond–slipbond–slip constitutive model of corroded reinforced concrete are presented by accounting for the influence coefficient of concrete strength. The results show that the constitutive model is in good agreement with the relevant experimental results.

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Component‐section transverse‐pressure effect on internal damage and failure mode of post‐installed rebar

Yang,

Zhao,

Song

et al. 2024

Structural Concrete

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A post‐installed rebar (PIR) is commonly used to establish structural connections between new components and existing structures, such as structural member extensions or concrete layer overlays in the construction/strengthening/retrofitting of buildings or bridges. In joint connections, the anchored PIR system always bears a non‐negligible compression in the component section, which is derived from the loads and self‐weight and has a confinement effect on the anchorage zone. However, excessive pressure can result in the fracture of the adhesive component, thereby leading to brittle failure in the PIR system. Owing to the important role of the adhesive component in the PIR system, this study is focused on the internal damage to the PIR system, and the effect of transverse pressure on the failure modes is investigated. This study comprises an experimental investigation of the failures of a PIR system under transverse pressure and a description of the internal damages based on the test results. Finally, an elastic analysis was established to explain the internal cracking and investigate the stress distribution in the PIR system. The tests on 34 pull‐out specimens showed two typical failures for the PIR system under transverse pressure (adhesive–rebar [A–R] interface failure and adhesive fracture failure). The A–R interface failure resulted from the shearing failure in the adhesive component, while the adhesive fracture failure resulted from the propagation of longitudinal and transverse cracks. The elastic analysis indicated that cracking in the concrete and adhesive component was dominated by circumferential stress, and the rebar rib direction and adhesive component thickness had a significant influence on the stress distribution. Based on this, some suggestions for anchorage design were made.

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Bond degradation of rebar and concrete confined with corroded stirrups: effects of concrete grade and casting position

Cited by 4 publications

References 32 publications

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Influence of Corrosion on the Bond–Slip Behaviour between Corroded Bars and Concrete

Component‐section transverse‐pressure effect on internal damage and failure mode of post‐installed rebar

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