Effect of macrocell currents on rebar corrosion in reinforced concrete structures exposed to a marine environment

Lliso-Ferrando, Josep Ramon; Gasch, Isabel; Martínez-Ibernón, Ana; Valcuende, M.

doi:10.1016/j.oceaneng.2022.111680

Cited by 23 publications

(6 citation statements)

References 57 publications

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“…In Group A (carbonated specimens + chloride exposure), steel corrosion took place uniformly on the surface of the steel. In this case for chloride-induced corrosion, where localised pitting was caused, the microcells that were generated in these zones were supported by the currents that were brought about in the nearby regions still in the passive state (i.e., macrocells), as previous works have revealed [75,94]. Different authors have demonstrated that this produces a pseudocapacitance effect that favours an increase in C DL [95,96].…”

Section: Double-layer Capacitancementioning

confidence: 69%

Corrosion Assessment in Reinforced Concrete Structures by Means of Embedded Sensors and Multivariate Analysis—Part 1: Laboratory Validation

Ramón-Zamora,

Lliso-Ferrando,

Martínez-Ibernón

et al. 2023

Sensors

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Reinforced Concrete Structures (RCS) are a fundamental part of a country’s civil infrastructure. However, RCSs are often affected by rebar corrosion, which poses a major problem because it reduces their service life. The traditionally used inspection and management methods applied to RCSs are poorly operative. Structural Health Monitoring and Management (SHMM) by means of embedded sensors to analyse corrosion in RCSs is an emerging alternative, but one that still involves different challenges. Examples of SHMM include INESSCOM (Integrated Sensor Network for Smart Corrosion Monitoring), a tool that has already been implemented in different real-life cases. Nevertheless, work continues to upgrade it. To do so, the authors of this work consider implementing a new measurement procedure to identify the triggering agent of the corrosion process by analysing the double-layer capacitance of the sensors’ responses. This study was carried out on reinforced concrete specimens exposed for 18 months to different atmospheres. The results demonstrate the proposed measurement protocol and the multivariate analysis can differentiate the factor that triggers corrosion (chlorides or carbonation), even when the corrosion kinetics are similar. Data were validated by principal component analysis (PCA) and by the visual inspection of samples and rebars at the end of the study.

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Section: Double-layer Capacitancementioning

confidence: 69%

Corrosion Assessment in Reinforced Concrete Structures by Means of Embedded Sensors and Multivariate Analysis—Part 1: Laboratory Validation

Ramón-Zamora,

Lliso-Ferrando,

Martínez-Ibernón

et al. 2023

Sensors

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“…Regarding the macrocell corrosion in concrete structures under the marine environment, researchers have conducted studies by electrochemical testing techniques. For example, Chen [14] verified the applicability of the Stern-Geary equation for the macrocell corrosion of reinforced concrete, and Li [15] found that corrosion will occur earlier and damage the structure more severely at the site where the macrocell effect occurs, and Lliso−Ferrando [16] found that the poorer the concrete quality and the smaller the cover layer, the greater the effect of the macrocell. Therefore, it is important to investigate the electrochemical corrosion behavior of reinforcing steel in ITTs under submarine environments, which can provide suggestions for the durability design of ITTs.…”

Section: Introductionmentioning

confidence: 91%

Corrosion Behavior of Reinforcing Steel in the Immersed Tube Tunnel (ITT) under Submarine Environment

Yan

Zhu²,

Fan³

et al. 2023

Materials

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The corrosion behavior of reinforcing steel in the ITT under a submarine environment was investigated. Electrochemical tests were carried out to separately determine the linear polarization curves and the AC impedance spectra of rebars in the ITT scaled-down models subjected to pressurized seawater erosion, from which key parameters were obtained, including the self-corrosion potential (Ecorr), corrosion current density (icorr), polarization resistance (Rp), concrete resistance (Rc), and charge migration resistance (Rct). The results show that in the process of pressurized seawater erosion, the rebars on the seawater side of the ITT models corroded earlier than the rebars on the cavity side, and it is recommended that anti-chloride ion penetration measures be taken on the surface of the seawater side as a priority in the project. The corrosion rate of rebars on the seawater side was significantly higher than that on the cavity side, and the corrosion rate of rebars on the cavity side increased as the erosion time increased. The corrosion rate of rebars in the ITT models was affected by chloride ions to a greater extent than by oxygen. Furthermore, by regression equation, a linear function between Rp obtained from the polarization curves and Rct obtained from the AC impedance spectra was established.

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“…However, seawater corrosion can lead to problems such as surface cracking, declining load carrying capacity, and lower life expectancy of concrete-reinforcing bars [ 2 , 3 , 4 , 5 ], and steel corrosion poses a serious risk to economic safety [ 6 ]. For this reason, the study on corrosion protection of concrete-reinforcing bars under marine environment can minimize economic losses and promote the development of marine resources [ 7 , 8 , 9 ]. Reinforcing bar corrosion in the marine environment is one of the major challenges, and it is therefore of great significance to study its protection measures.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of CeO2-GO/Epoxy Nanocomposite Coating in Simulated Seawater and Concrete Pore Solutions

Liu

Lyu

et al. 2023

Polymers

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Reinforced concrete structures in the marine environment face serious corrosion risks. Coating protection and adding corrosion inhibitors are the most economical and effective methods. In this study, a nano-composite anti-corrosion filler with a mass ratio of CeO2:GO = 4:1 was prepared by hydrothermally growing cerium oxide on the surface of graphene oxide. The filler was mixed with pure epoxy resin at a mass fraction of 0.5% to prepare a nano-composite epoxy coating. The basic properties of the prepared coating were evaluated from the aspects of surface hardness, adhesion grade, and anti-corrosion performance on Q235 low carbon steel subjected to simulated seawater and simulated concrete pore solutions. Results showed that after 90 days of service, the corrosion current density of the nanocomposite coating mixed with corrosion inhibitor was the lowest (Icorr = 1.001 × 10−9 A/cm2), and the protection efficiency was up to 99.92%. This study provides a theoretical foundation for solving the corrosion problem of Q235 low carbon steel in the marine environment.

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Effect of macrocell currents on rebar corrosion in reinforced concrete structures exposed to a marine environment

Cited by 23 publications

References 57 publications

Corrosion Assessment in Reinforced Concrete Structures by Means of Embedded Sensors and Multivariate Analysis—Part 1: Laboratory Validation

Corrosion Assessment in Reinforced Concrete Structures by Means of Embedded Sensors and Multivariate Analysis—Part 1: Laboratory Validation

Corrosion Behavior of Reinforcing Steel in the Immersed Tube Tunnel (ITT) under Submarine Environment

Corrosion Resistance of CeO2-GO/Epoxy Nanocomposite Coating in Simulated Seawater and Concrete Pore Solutions

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