Prediction of corrosion-induced cracking of concrete cover: A critical review for thick-walled cylinder models

Liang, Yongqin; Wang, Licheng

doi:10.1016/j.oceaneng.2020.107688

Cited by 38 publications

(16 citation statements)

References 41 publications

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“…( 23) is equal to E c � ð1 þ ϕ cr Þ, and ϕ cr is the concrete creep coefficient. The review article by Liang and Wang (2020) listed eight published papers on the problem of corrosioninduced cracking prediction, and the values of the concrete creep coefficient varies from 0 to 3. In three of them, the value of the concrete creep coefficient, ϕ cr , was taken as 2.0, which was the most widely accepted by the researchers; thus, this value was also adopted in this study.…”

Section: Resultsmentioning

confidence: 99%

“…The results in this table were calculated by replacing the diameter of the round-rebar with the width of the square-rebar. ratio, μ, of 0.18 was used in this study, which has been adopted by many researchers (Liang and Wang 2020). Although some parameters concerning the corrosion products of square-rebars have not been studied extensively yet, tested 36 squarerebars, and found that they were hot-rolled, which is the same technique followed for the current hot-rolled round-rebars.…”

Section: Resultsmentioning

confidence: 99%

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Square-rebar corrosion-induced cover cracking and its time prediction for historical reinforced concrete buildings in China

Jin

Chun

Hua

et al. 2021

Journal of Asian Architecture and Building Engineering

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Square-rebars have been used in many historical reinforced concrete buildings worldwide. The durability and structural behavior of such historical buildings should be evaluated regularly and accurately. The prediction of the corrosion-induced cracking time is a critical element for the durability evaluation work. This study demonstrates a mathematical model for the corrosion-induced cover cracking for square-rebars and its time prediction method. The research methodology includes theoretical derivation and experimental validation. First, a simplified model that describes the corrosion-induced cover cracking for square-rebars is proposed, and then, Faraday's law is combined with the model to develop a time prediction model for corrosion-induced cover cracking. Finally, an accelerated corrosion experiment for squarerebars is performed to validate the applicability and accuracy of the prediction model.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Square-rebar corrosion-induced cover cracking and its time prediction for historical reinforced concrete buildings in China

Jin

Chun

Hua

et al. 2021

Journal of Asian Architecture and Building Engineering

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“…11,17 There are more than 30 kinds of thick-walled cylinder models since Bažant 6 with different kinds of assumptions and constitutive laws for cracked concrete, number of cylinders, hypotheses of cracks morphologies, the ability to calculate surface crack propagation or not and the different values of some involving parameters. 29 For example, based on the cylinder numbers of these models, they can be classified as singlecylinder model, 7,22 double-cylinder model 30,31 and N-ring model. 32,33 Besides, two kinds of crack morphologies are usually used in the thick-walled cylinder models, that is, the smeared crack model 30,31 and fictitious crack model.…”

Section: Second Stage: Corrosion Damage Stage 221 | Analytical Models For Corrosioninduced Cracking Of Concrete Covermentioning

confidence: 99%

Effect of water‐to‐cement ratio on service life of reinforced concrete structures in chloride environment

Liang

Wang

2021

Structural Concrete

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Cracking of concrete induced by rebar corrosion is a main cause for deterioration of reinforced concrete structures especially for those exposed to chloride environment. In all of the parameters influencing the service life of concrete structures, water-to-cement ratio is a very important one for it determines the resistance of concrete against chloride aggression and corrosion-induced damage. In this paper, the parameters in corrosion process influenced by water-to-cement ratio of concrete (w/c) are screened all-round which include concrete tensile strength f t , elastic modulus E c , porous zone thickness δ 0 , corrosion current density i corr , critical chloride content C cr , and chloride diffusion coefficient D cl . The influences of w/c on the chloride penetration stage and the corrosion damage stage are studied. The first stage is expressed by Fick's second law, and the second stage is calculated using a commonly used analytical model, i.e. the thickwalled cylinder model. It is found that with the increase of w/c, the change of some parameters (f t ", C cr ", D cl #, i corr #) will induce increase of the service life, while the change of the others (E c ", δ 0 #) will induce decrease of the service life.The diffusion stage and damage stage both shorten with the increase of w/c, and thus the total service life decreases with the increase of w/c. These results show that the increase of w/c presents a negative effect on the service life of concrete structures in total. In addition, with the increase of w/c, the service life for various concrete cover thicknesses and rebar diameters decrease in a similar tendency. For probability analyses, it is found that the probability density curves under different w/c are almost symmetric but show a little left-skewed, and the total service life for various w/c fluctuates about 0.6 to 1.0 year.chloride diffusion, cover cracking, rebar corrosion, service life, water-to-cement ratio | INTRODUCTIONRebar corrosion is a serious problem affecting the durability and safety of reinforced concrete structures which reduces cross-section of rebar, bond strength between the corroded rebar and concrete and induces cracking of Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…δ cr = 0.012c/d + 0.00084 f cu,e + 0.018 (10) where t pre is the durability prediction life (years); t cr is the time from corrosion initiation to concrete cover cracking (year); δ cr is the critical corrosion depth of rebar (mm); λ is the corrosion rate of rebar (mm/year); K cl is the rebar location coefficient, and d is the diameter of the round rebar section. Equation ( 7) defines the durability prediction life of one component, while Equation (8) defines the time from corrosion initiation to concrete cover cracking as the critical corrosion depth of rebar divided by the corrosion rate of rebar.…”

Section: The Time From Corrosion Initiation To Concrete Cover Crackingmentioning

confidence: 99%

“…In the current state, almost all studies related to durability prediction and corrosion induced cracking for reinforced concrete (RC) components and structures focus on the round rebar cases [1][2][3][4][5][6][7][8][9][10]. The concrete structure design standards and codes in many countries and states also default that the type of reinforcement is round steel rebar [11][12][13], without any application description for square steel rebar.…”

Section: Introductionmentioning

confidence: 99%

A Durability Prediction Method for Historical Square Rebar Reinforced Concrete Buildings

et al. 2021

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Square rebars were developed and used for decades in the early development of reinforced concrete (RC) structures; however, the objectives of modern concrete structure durability analyses and standards are centered on round rebars in past decades, which are not suited for RC buildings utilizing square rebars. Considering the absence of proper evaluation techniques to evaluate the square rebar RC structures’ durability accurately, a novel durability prediction method has been proposed for this type of historical building. The method is based on major parts as in-situ investigation, finite element model simulation, component importance analysis, and structural durability prediction. The durability prediction calculation method was established on the experimental results of the realistic historical concrete tests and corrosion-induced cover cracking experiments for square rebar components. It was found that the carbonization-resistant ability of historical concretes was relatively weaker than that of current concretes and the calculation method for critical corrosion depth of square rebar was different from that of round rebar. Furthermore, two typical application cases are presented to introduce the procedure of the method in detail. Consequently, the research outcomes can be directly used on the durability prediction and protection works for historical RC buildings.

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Prediction of corrosion-induced cracking of concrete cover: A critical review for thick-walled cylinder models

Cited by 38 publications

References 41 publications

Square-rebar corrosion-induced cover cracking and its time prediction for historical reinforced concrete buildings in China

Square-rebar corrosion-induced cover cracking and its time prediction for historical reinforced concrete buildings in China

Effect of water‐to‐cement ratio on service life of reinforced concrete structures in chloride environment

A Durability Prediction Method for Historical Square Rebar Reinforced Concrete Buildings

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