Influence of long-term chloride diffusion in concrete and the resulting corrosion of reinforcement on the serviceability of RC beams

Zhu, Wenjun; François, Raoul; Fang, Qian; Zhang, Dingli

doi:10.1016/j.cemconcomp.2016.05.003

Cited by 62 publications

(20 citation statements)

References 16 publications

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“…Cao et al [15] found that oxygen is a crucial factor influencing rebar corrosion propagation process during the full RC structures' service life. Zhu et al [16] investigated the influence of load-induced cracking behavior on the process of chloride penetration into concrete. Pacheco et al [17] analyzed bending cracks in RC samples by measuring the electrical resistance across the crack and illustrated that cracks in concrete represent fast routes for chloride penetration, which can result in rebar corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

et al. 2018

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Exposed to aggressive environments, the rebar in reinforced concrete (RC) bridges will be corroded gradually. Durability of RC material mostly depends on the rebar corrosion behavior. In this research, influences of crack on rebar corrosion were investigated. Firstly, RC specimens with different crack number, width and spacing were prepared and the rebar corrosion was conducted through an accelerated chloride penetration method. Then, corrosion current densities of rebar were calculated from electrochemical test methods including liner polarization (LP), Tafel potentiodynamic polarization (TPP) and electrochemical impedance spectroscopy (EIS) measurements. Finally, the discussion was presented about a more reasonable electrochemical testing method for rebar corrosion in RC material. Besides, the significant influence factor among crack width, number and spacing was evaluated based on both One-way analysis of variance (One-way ANOVA) and Turkey's honest significant difference (Turkey's HSD) test. The results revealed that a more reasonable way to obtain corrosion current densities of rebar is combining EIS measurement with TPP measurement. Crack number shows the most significant effect on corrosion behavior of rebar, while crack spacing possesses the least one.

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Section: Introductionmentioning

confidence: 99%

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

et al. 2018

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“…Once the corrosion process advances due to the electrochemical process of corrosion, rust starts to develop which much larger in a volume than existing reinforcement and get started to fill inside the pores of the concrete and developed radial pressure which further leads to cracking of concrete cover (Zhu, Francois, Fang, & Zhang, 2016). To measure the penetration depth of chloride in concrete Faraday's law was used and presented by equation 1 (Alonso et al, 1998).…”

Section: Accelerated Methods Of Corrosionmentioning

confidence: 99%

Corrosion Impact Analysis on Residual Life of Structure Using Cathodic Technique and Algor Simulation Software

Nayak

Throat

Thakare³

2018

Engineering Structures and Technologies

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Abstract. Damage to the reinforced concrete structure is mainly occurring because of two reasons either due to end of service life or due to load exceeds beyond structural capacity. Along with these two reasons degradation of material property is the one more major factor which causes the risk of failure. A concrete structure constructed in an aqueous environment get exposed to the corrosion process. Consequently, this causes the generation of crack, fragilization, a decrease of bond strength between reinforcement and concrete. All these factors affection static and dynamic behavior of concrete structure reducing the service life of an affected area. Whereas service life carries the major role in the economy of a concrete structure that is why various methods have been developed in the second half of the 20 th century to find out the residual life of the structure. In this proposed work, a non-destructive technique is used to predict the residual life of reinforced concrete beams having different cracking levels, as results of steel reinforcement corrosion, considering the variation produced in the dynamic behavior, through the variation of the first natural vibration frequency. Whereas to accelerate the corrosion process, impress current technique is used in which a current is externally applied to induce corrosion in reinforcement and then crack widths and vibration natural frequencies were measured. A numerical model is proposed with the help of FEM based Auto desk Algor simulation software to predict attack penetration depth. At the end, the paper is concluded by giving an effect of "water to cement ratio" and "cover to diameter ratio" on the initiation and propagation of corrosion and residual life of corroded beam specimen is graphically represented.

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“…1 This phenomenon simultaneously results in section loss in the steel reinforcement [2][3][4] and formation of expansive corrosion products. 3,[5][6][7][8] The former mechanism immediately reduces structural capacity, while the latter exerts cracking pressure on the concrete cover. The resulting cracks destroy the protection provided by the concrete cover and render the structure more vulnerable to chloride intrusion and damage from freezing and thawing.…”

Section: Introductionmentioning

confidence: 99%

Analytical Models for 3-D Diffusion of Ions from Salt-Contaminated Aggregates

Thomas

Sorensen

Maguire

2019

Advances in Civil Engineering Materials

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This article presents an analytical investigation of the mobility of salts from contaminated aggregates in concrete. Salt-contaminated aggregates may have varied effects on the mechanical properties and durability of concrete. These depend primarily on the mobility of salts within the concrete matrix. Existing diffusion-based models for the mobility of salts in concrete focus on their intrusion from external sources (e.g., chloride penetration from deicing salts and brines). Such problems are well described by the closed-form solution of Fick's law for diffusion in one dimension from a continuous source. Salt-contaminated aggregates represent a case of diffusion from a finite internal source rather than intrusion from a continuous external source. When the source is internal-as in the case of salt-contaminated aggregates-diffusion occurs in three dimensions and the source is finite. The 1-D solution is ill conditioned to model this problem, so new diffusion models must be introduced. This article presents two models of varying complexity that are well conditioned to model diffusion of salts from contaminated aggregates. First, the problem is modeled using Fick's law for the simplified case of 3-D diffusion from an instantaneous point source in an infinite medium. Contaminated aggregates are treated as infinitesimal slugs of diffusing material. The same problem is then modeled using Fick's law for the more realistic case of 3-D diffusion from an instantaneous spherical source, where contaminated aggregates are treated as approximately spherical. The intent of this article is to present an academic discussion on how chloride ions might migrate within the concrete matrix if they are assumed to do so by diffusion alone.

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Influence of long-term chloride diffusion in concrete and the resulting corrosion of reinforcement on the serviceability of RC beams

Cited by 62 publications

References 16 publications

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

Corrosion Impact Analysis on Residual Life of Structure Using Cathodic Technique and Algor Simulation Software

Analytical Models for 3-D Diffusion of Ions from Salt-Contaminated Aggregates

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