Bond-slip behaviour of corroded reinforcement and ultra-high toughness cementitious composite in flexural members

Hou, Lei; Guo, Shang; Zhou, Bingxuan; Chen, Da; Aslani, Farhad

doi:10.1016/j.conbuildmat.2018.11.141

Cited by 26 publications

(10 citation statements)

References 26 publications

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“…They found that the corrosive influence on bond strength could be ignored when the corrosion loss was less than 2.4% and that the bond behavior between the smooth bar and the concrete was more sensitive to corrosion than that of the specimen with the deformed bar. Lijum H. et al [13] experimentally studied the behavior of RC ultra-high toughness cementitious composite beam. They indicated that corrosion clearly affected the load carrying capacity, the deformation, the ductility and the flexural crack patterns of the damaged specimens.…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique

2019

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An experimental study was conducted to evaluate the efficiency of patch repair to rehabilitate corrosion-defected reinforced concrete (RC) beam-column members when exposed to bending moments and axial forces. Ten RC beam-column members were tested under combined constant axial force and four-point transverse load up to failure. Two levels of the constant axial force were applied at either 15 kN or 30 kN (i.e., 25% or 50% of the ultimate design load of the control specimen). The accelerated corrosion process was used to get steel reinforcement corrosion inside the concrete of three levels, 0% and approximately 5% and 20%, according to Faraday’s law. The patch repair technique of cleaning or replacing corroded steel bars and replacing the damaged concrete cover with new mortar was used in this study. The experimental results of the corrosion-defected specimens showed a significant deterioration in the structural performance and the integrity by reducing ultimate capacity, stiffness, serviceability, and ductility. Additionally, the effect of increasing axial force was recorded clearly by reducing the adverse effect of corrosion, especially for defected specimens with high corrosion level. The deterioration of corrosion reinforcement could be overcome when using a patch repair technique, which restored the undamaged state and was shown clearly by using a patch repair technique with replacing corroded steel bars.

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Section: Introductionmentioning

confidence: 99%

Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique

2019

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“…Due to the existence of initial defects in the interface between concrete and I-shaped steel,it is difficult to determine the bond performance index, which can be used to reflect the interface nondestructive state. In order to analyze interface damage, a concept of relative damage variable is proposed, which can be expressed by Equation (16).…”

Section: Definition Of Interface Relative Damage Variablementioning

confidence: 99%

“…However, a lot of work has been historically carried out to investigate the impact of corrosion on the rebar. Abundant achievements have been made in the following four aspects: (1) the law of bearing capacity degradation caused by reinforcement corrosion [8][9][10][11][12][13] ; (2) the law of bond strength degradation caused by reinforcement corrosion [14][15][16][17][18] ; (3) the average bond stress-slip relationship of corroded reinforced concrete 14,15,19,20 ; (4) reparation of corroded reinforced concrete through different materials. [21][22][23] The rebar is corroded, its own strength is reduced and the bond is degraded, resulting in a reduction in the bearing capacity from above mentioned research.…”

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confidence: 99%

Experimental research and mechanical analysis on the bond‐slip behavior between concrete and corroded I‐shaped steel

Zhang

Wang

Guo

et al. 2021

Structural Concrete

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Corrosion of I-shaped steel in the primary support of the subsea tunnel is inevitable due to high chloride ion content, which will weaken the bond performance between concrete and I-shaped steel, resulting in a reduction in the service time of the subsea tunnel. Based on Xiang'an subsea tunnel, the bond-slip behavior between concrete and corroded I-shaped steel was studied by the accelerated corrosion tests and push-out tests, the experimental results indicated that: (1) The cracks of experimental specimens could be divided into two main forms: splitting failure (corrosion rate less than 5.79%); spalling failure (corrosion rate more than 5.79%). (2) A three-stage bond-slip law for concrete and corroded I-shaped steel was proposed, and the formulae for calculating the bond strength were established. Furthermore, the degradation process of bond-slip caused by corrosion was analyzed by energy principle and damage mechanics. Based on energy principle, it found that the elastic energy stored in the interface increased before the peak point of bond-slip curve and decreased after the peak point, while the dissipated energy in the interface always increased with slip value. Finally, the interface relative damage variable was defined based on secant line anti-sliding modulus and slip equivalent principle. The interface damage development process can be divided into three stages: initial damage, rapid damage development, and slow damage accumulation.

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“…At the same time, there are many studies on bond-slip behavior of corroded reinforced concrete. Abundant achievements have been made in the following three aspects: the law of bond strength degradation caused by reinforcement corrosion, the average bond stress-slip relationship of corroded reinforced concrete, and the bond-slip constitutive relationship of corroded reinforced concrete considering the influence of anchorage position [13,14,15,16,17,18,19,20,21,22]. However, for the subsea tunnels, I-shaped steel concrete is different from ordinary reinforced concrete in the following four aspects: (1) The contact area between I-shaped steel and concrete is larger (the difference can be five times); (2) The spatial form of I-shaped steel and steel bar is different, which leads to the difference of mechanical properties; (3) The corrosion of I-shaped steel is uneven, and corrosion in the flange side is usually bigger than that in the web side; (4) There is uneven expansion force between corroded I-shaped steel and concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bond-Slip Behavior between Corroded I-Shaped Steel and Concrete in Subsea Tunnel

et al. 2019

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Degradation of the bond between I-shaped steel and concrete due to the corrosion of I-shaped steel significantly affects the durability of steel reinforced concrete (SRC) structures. This study carried out the accelerated corrosion test and push-out test to study the bond-slip behavior and characteristics considering the corrosion of I-shaped steel, and test results indicated that: (1) The performance degradation of the bond-slip accelerated when the corrosion ratio reached 12%. (2) The corrosion failure pattern of SRC experienced slip phase and destruction phase in the rising stage. (3) Based on the principle of minimum potential energy, the bond stress was obtained only with the load and the displacement in the free end and the loading end. (4) Meanwhile, a new bond-slip degradation model was developed using the interface damage theory. Finally, the proposed model agreed with the experimental results.

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Bond-slip behaviour of corroded reinforcement and ultra-high toughness cementitious composite in flexural members

Cited by 26 publications

References 26 publications

Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique

Rehabilitation of Corrosion-Defected RC Beam-Column Members Using Patch Repair Technique

Experimental research and mechanical analysis on the bond‐slip behavior between concrete and corroded I‐shaped steel

Experimental Study on Bond-Slip Behavior between Corroded I-Shaped Steel and Concrete in Subsea Tunnel

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