Evaluation Method of Tensile Behavior of Corroded Reinforcing Bars Considering Radius Loss

Qiao, Di; Nakamura, Hikaru; Yamamoto, Yoshihito; Miura, Taito

doi:10.3151/jact.13.135

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…The mechanically and chemically induced broken symmetry is to be further investigated too as a highly coupled problem of interest. Qiao et al (2015) further investigated the non-uniform corrosion of reinforcing bar section at the greater magnitude in consideration of the electro-field as well. This is of importance to understand corrosion processes under more natural environments.…”

Section: Electrically Induced Corrosion With No Chloride: Broken Symmmentioning

confidence: 99%

Nonlinear Gel Migration in Cracked Concrete and Broken Symmetry of Corrosion Profiles

Gebreyouhannes

Maekawa

2016

ACT

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The initiation and subsequent propagation of corrosion-induced cracks is simulated by multi-phase mechanics where the coupled corrosion gel migration and crack-based fracture can be coherently taken into consideration. A key focus is given to the nature of corrosion products and their dependency on the corrosion rate and the anisotropic stiffness and permeability caused by cracking. Migration of corrosion gel to both micro-pores of cementitious composites and crack gaps are explicitly considered under the gradient of gel pressure, which is newly defined on the corrosion gel phase. The effects of cover depth, corrosion rate and the mix-proportion of concrete on the crack initiation and propagation are discussed with experimental facts. The broken symmetry of corrosion profile around reinforcing bars is successfully simulated as a nature even though the geometry of analysis domains would be in perfect symmetry. This scheme which allows kinematics of produced gel is indispensable for a versatile framework of durability mechanics.

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Section: Electrically Induced Corrosion With No Chloride: Broken Symmmentioning

confidence: 99%

Nonlinear Gel Migration in Cracked Concrete and Broken Symmetry of Corrosion Profiles

Gebreyouhannes

Maekawa

2016

ACT

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“…Thus, RC slabs were horizontally placed in a pool filled with 5% NaCl solution so that the slabs were partially immersed and the steel rebars were kept above the liquid level, as shown in Figure 2 . Because the side near the cathode will be corroded more seriously [ 37 ], stainless steel sheets used as cathodes were distributed around the concrete cover side and connected to the negative end of the DC supply, to simulate one-side corrosion in residual engineering conditions. The applied current density was 300 μA/cm 2 constantly during the accelerated corrosion.…”

Section: Experimental Programmentioning

confidence: 99%

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

2023

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Rebar corrosion is the primary cause of the durability degradation of reinforced concrete (RC) structures, where non-uniform corrosion is the typical pattern in engineering. This study experimentally and numerically investigated the tensile degradation properties of non-uniform corroded rebars. Corrosion morphology was accurately determined by three-dimensional (3D) laser scanning techniques, studying the characteristics of longitudinal non-uniform corrosion. The results showed that the non-uniformity of corrosion increased with an increase in corrosion levels. From tensile tests, the differences in nominal stress–strain curves among rebars with similar average corrosion levels indicated that corrosion non-uniformity has appreciable effects on the tensile behavior of rebars. The residual load-bearing capacity of corroded rebars was dominated by the reduced critical cross-section, while residual ductility was associated with the cross-section loss throughout the entire length of rebars. The degradation relations of nominal yield and ultimate strength, ultimate strain, and elongation after fracture were better correlated to the maximum cross-section loss than to the average volume loss. Additionally, numerical calculation based on the cross-sectional areas of corroded rebars was conducted to evaluate the tensile behavior of non-uniform corroded rebars. Equivalent distribution models simulating the longitudinal non-uniform corrosion were proposed, on the basis of probability characteristics of cross-sectional areas, for practical application of the numerical method.

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“…Additionally, a digital image processing method using distinguishable round spots on the rebar surface was employed to obtain the strains up to tensile failure as they often exceed the upper measurement limit of the strain gauge. Detailed descriptions of the test procedures and the digital image processing method can be found in (Qiao et al 2015a). Figure 8 shows the load-elongation curves of the T341 and T625 cases with corrosion degrees ranging from 3.1% to 6.83%, which are compared with that of the non-corroded rebar sample.…”

Section: Tensile Performance Of Corroded Rebarsmentioning

confidence: 99%

“…13 (Qiao et al 2015a). Figure 16 shows an illustration of the calculation method of degradation factors.…”

Section: Tension Simulation Of Corroded Rebarsmentioning

confidence: 99%

“…To evaluate the corrosion-induced damage on concrete and the rebar, local radius losses of the rebar are needed to predict the expansion pressure caused by volume increase of corrosion products (Lundgren 2002), and to estimate the reduction of rebar cross-section area and the residual tensile capacity (Cairns et al 2005;Qiao et al 2015a). It is well known that corrosioncaused cracks can help to speed up the penetration of chlorides, oxygen, and water into the concrete, thereby accelerating the corrosion process and causing more cracks (Bažant 1979;Djerbi et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Corrosion-Induced Damage in Reinforced Concrete Considering Electro-Mechanical Coupling

Qiao

Nakamura

Yamamoto

et al. 2016

ACT

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This paper presents an electro-mechanical model for evaluating the corrosion-induced damage in reinforced concrete under accelerated conditions. The model consists of structural analysis of concrete and the rebar using the Rigid Body Spring Method and corrosion current analysis with the truss networks model. The electric corrosion process is coupled with concrete cracking conditions by relating current efficiency to local crack width; the predicted radius losses of rebars are used to evaluate concrete crack propagation and residual tensile performance of corroded rebars. The model is validated with the results of accelerated corrosion tests using impressed current and a sodium chloride pond on the concrete cover. Good agreement with the test data is obtained with the proposed model, in terms of corrosion degree and profile, concrete crack pattern, and tensile behavior of corroded rebars. The model offers a corroborative tool with the accelerated corrosion technique to study the mechanical behavior of corroded concrete structures.

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Evaluation Method of Tensile Behavior of Corroded Reinforcing Bars Considering Radius Loss

Cited by 7 publications

References 24 publications

Nonlinear Gel Migration in Cracked Concrete and Broken Symmetry of Corrosion Profiles

Nonlinear Gel Migration in Cracked Concrete and Broken Symmetry of Corrosion Profiles

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

Modeling of Corrosion-Induced Damage in Reinforced Concrete Considering Electro-Mechanical Coupling

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