Analytical Model for Residual Bond Strength of Corroded Reinforcement in Concrete Structures

Chen, Hua-Peng; Nepal, Jaya

doi:10.1061/(asce)em.1943-7889.0000997

Cited by 30 publications

(7 citation statements)

References 24 publications

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“…The thick-walled cylinder model has been frequently employed to analyze the corrosion-induced concrete cracking [ 3 , 8 , 11 , 21 ]. This model can be considered as an axisymmetric problem subject to the uniform pressure, which can be further modeled as the plane stress problem under the symmetric conditions [ 42 ].…”

Section: Prediction Model Of Crack Propagationmentioning

confidence: 99%

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Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

et al. 2016

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The filling of strand corrosion products during concrete crack propagation is investigated experimentally in the present paper. The effects of stirrups on the filling of corrosion products and concrete cracking are clarified. A prediction model of crack width is developed incorporating the filling proportion of corrosion products and the twisting shape of the strand. Experimental data on cracking angle, crack width, and corrosion loss obtained from accelerated corrosion tests of concrete beams are presented. The proposed model is verified by experimental data. Results show that the filling extent of corrosion products varies with crack propagation. The rust filling extent increases with the propagating crack until a critical width. Beyond the critical width, the rust-filling extent remains stable. Using stirrups can decrease the critical crack width. Stirrups can restrict crack propagation and reduce the rust filling. The tangent of the cracking angle increases with increasing corrosion loss. The prediction of corrosion-induced crack is sensitive to the rust-filling extent.

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Section: Prediction Model Of Crack Propagationmentioning

confidence: 99%

“…The corrosion solution can easy diffuse to steel surface through the concrete cracks, which would further accelerate the corrosion of steel [ 6 ]. In addition, concrete cracking also weakens the bond between steel and concrete [ 7 , 8 ]. These coupling effects decrease the durability and safety of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

et al. 2016

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“…Te corrosion of rebar usually leads to the following consequences: frst, the corrosion leads to the reduction of the efective area of rebar and concentration of stress in rebar [1]; second, it leads to degradation of bond performance between rebar and concrete [2,3]; third, the volume expansion of corrosion products leads to the cracking and peeling of the protective layer [4]. In addition, corrosion will also weaken the seismic capacity [5], bending strength [6], defection [7], etc., of the RC beams, resulting in a reduction in the bearing capacity and safety of RC beams [8,9]. Terefore, rebar corrosion detection has received considerable attention due to the increasing awareness about the durability and safety of reinforced concrete structures, particularly rebar.…”

Section: Introductionmentioning

confidence: 99%

Grading Evaluation of Overall Corrosion Degree of Corroded RC Beams via SMFL Technique

Zhang

Jiang³

et al. 2023

Structural Control and Health Monitoring

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To accurately evaluate the overall corrosion degree of reinforced concrete (RC) beams, on the basis of the SMFL technology, the overall random corrosion detection experiment of six RC beams was carried out. The relationship between the tangential component By and the normal component Bz of the magnetic induction intensity and corrosion degree was analyzed, and a multidefect magnetic dipole model was established. The correlation between the average corrosion ratio C of the RC beam and the magnetic characteristic index KG was emphatically explored. The results showed that, with the increase in the average corrosion ratio C, the magnetic characteristic index KG showed an increasing trend as a whole. The index KG could weaken the influence of different historical magnetizations, but it had a certain dispersion. On the basis of the correlation and the Naive Bayesian model, the average corrosion ratio C was divided into four grades. The probability of C falling in different value ranges can be quantitatively evaluated using the KG magnetic characteristic index. The reliability is as high as 97.4% and as low as 56.8% so as to realize the quantitative grading evaluation of the corrosion of the rebar in the RC beam.

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“…To date, several studies have proposed analytical models in order to evaluate the radial pressure due to corrosion oxides and subsequently to predict the loss of initial bond strength between steel and concrete due to the corrosion effect [26,[33][34][35]. Coccia et al developed an analytical model, which provides the residual bond strength due to corrosion related to the mass loss of steel bar, representing the unconfined conditions (without stirrups) [27].…”

Section: Introductionmentioning

confidence: 99%

“…Coccia et al developed an analytical model, which provides the residual bond strength due to corrosion related to the mass loss of steel bar, representing the unconfined conditions (without stirrups) [27]. Chen et al presented an analytical model for bond degradation of a corroded reinforcing bar, including the influence of adhesion, confinement and corrosion level [35]. Following this approach, predictive models of residual bond strength in relation to the average crack width have been proposed [16,21,36].…”

Section: Introductionmentioning

confidence: 99%

Study of the Residual Bond Strength between Corroded Steel Bars and Concrete—A Comparison with the Recommendations of Fib Model Code 2010

Koulouris

Apostolopoulos

2021

Metals

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As is well known, corrosion of steel reinforcement deteriorates the steel–concrete interface and causes concrete cracking, degrading significantly the bond strength. Several experimental studies have investigated the magnitude of residual bond strength due to corrosion, which affects either the function of corrosion-damaged steel bars or the surface crack width in concrete. As a result, linear and exponential correlation relationships have been proposed in order to predict the bond loss due to corrosion. Based on the results of an ongoing experimental campaign on the degradation of bond strength of RC specimens, combined with comparable outcomes from existing literature, this manuscript summarizes a database, comparing with the recommendations of Model Code 2010, to analyze and interpret the corrosion effect on the bond loss and highlights some points that need improvement in the current regulations. As indicated, the density of transverse reinforcement (stirrups spacing) has intense impact on the resulting bond loss due to corrosion. Hence, in order to quantify this aspect, the present manuscript introduces a discretization of confinement levels of RC elements, depending on the stirrups spacing. Based on this, regression analyses of data were conducted to extract fitting curves of bond loss, taking into account the amount of transverse reinforcement and predictive zones of residual bond strength in relationship to either corrosion penetration or surface crack width. Furthermore, the outcomes demonstrate that the corrosion penetration depth is an appropriate assessment tool to correlate the residual bond strength with the corrosion level, whereas the surface crack width on concrete is not yet an effective index, since there is a plethora of factors affecting the crack width. Due to this, more research is needed to improve the current level of knowledge on the surface crack width and link it with the corrosion damage of the steel bar and the residual bond strength due to corrosion.

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Analytical Model for Residual Bond Strength of Corroded Reinforcement in Concrete Structures

Cited by 30 publications

References 24 publications

Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

Grading Evaluation of Overall Corrosion Degree of Corroded RC Beams via SMFL Technique

Study of the Residual Bond Strength between Corroded Steel Bars and Concrete—A Comparison with the Recommendations of Fib Model Code 2010

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