Establishment of Coupled Analysis of Interaction between Structural Deterioration and Reinforcement Corrosion by Salt Damage

Suzuki, Mika; Fukuura, Naoyuki; Takeda, Hitoshi; Maruya, Tsuyoshi

doi:10.3151/jact.14.559

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…In consideration of the passive condition of rebar in the high alkalinity of concrete pore solution and the breaking of the passive film by chloride, two parameters are adopted to characterize the anodic reaction with respect to the spontaneous potential and Tafel slope (Stern and Geary 1957;Hussain and Ishida 2011;Suzuki et al 2016), as indicated by Eqs. ( 10) and ( 11) and Fig.…”

Section:  mentioning

confidence: 99%

Space Averaging of Electric Field accompanying Corrosion of Reinforcement and its Verification by Pseudo-Concrete

Wang

Maekawa

Gong

2023

ACT

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This paper aims to verify a space-averaged electric filed simulation, where the whole surfaces of reinforcing bars are blended into the 3D finite volume for identifying the electric potential to drive the macro-cell corrosion of structural concrete. Experimental verification is conducted with transparent pseudo-concrete, which has chemical pore-solutions similar to those of concrete, and with which the location of anodic poles accompanying brownish rusts and the cathodic ones surrounded by hydrogen bubbles may be visually identified. The proposed electro-chemical analysis platform to be integrated with ion transport and equilibrium is adopted for full consistency with dispersed reinforcing bars. Global macro-cell corrosions of tunnel mockup and reinforcement layers induced by electric current leakage are verified quantitatively with dispersed multi-ion concentration as well as corrosion profile.

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Section:  mentioning

confidence: 99%

Space Averaging of Electric Field accompanying Corrosion of Reinforcement and its Verification by Pseudo-Concrete

Wang

Maekawa

Gong

2023

ACT

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“…Corrosion of reinforcing bars in structural concrete is a critical deterioration associated with electro-chemical reaction, which is generally classified as micro-cell circuit where anodic and cathodic polarization proceeds locally at one place, and the macro-cell one where oxidation and reduction separately progress in space with great rapidity (Suzuki et al 2016;Angst 2018). For the former case, global electric field is not necessarily solved for estimating rate of corrosion.…”

Section: Introductionmentioning

confidence: 99%

Space-Averaged Non-Local Analysis of Electric Potential for Polarization Reactions of Reinforcing Bars in Electrolytes

Maekawa

Okano

Gong

2019

ACT

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For assembly of reinforcing bars embedded in electrolyte like concrete, space-averaged non-local analysis for electric potential is proposed and the anodic and cathodic polarization reactions are formulated in association with the exchange of electric charge between steel reinforcing bars and the electrolyte as matrix. In order to verify the proposed scheme like smeared crack modeling of cracked concrete mechanics, transparent sodium poly-acrylate superabsorbent polymer with calcium hydrate solution was made so that we may identify the location of anodic and cathodic reactions of reinforcement at regular time intervals. The analytically predicted locations of corrosion were compared with the experiments, and its functionality of non-local formulation was verified and its applicability was experimentally examined.

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“…Many of the previous researchers have applied galvanostatic electrolysis with current densities from 1 to 100 A/m 2 to steel rebar in concrete from 24 to a few thousand hours. [11][12][13] For example, Takaya et al applied an anodic current of 12.2 A/m 2 for 24 h, 14 and the obtained rust often contained large amount of Cl − and CaFeO 2 Cl and Fe 6 Cl 2-x (OH) 12+x were observed in the rust. These species cannot be found in the rust naturally formed in the practical service environment.…”

mentioning

confidence: 99%

Effects of Oxygen Pressure and Chloride Ion Concentration on Corrosion of Iron in Mortar Exposed to Pressurized Humid Oxygen Gas

Doi

Hiromoto

Katayama

et al. 2018

J. Electrochem. Soc.

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The effects of oxygen pressure on the corrosion of iron embedded in mortar with various Cl − contents were examined by using a novel hyperbaric-oxygen accelerated corrosion test (HOACT). Exposure and electrochemical tests of a pure iron sample embedded in mortar with a cover thickness of 5 mm were performed in HOACT condition with pressurized 100% oxygen gas and with relative humidity of 95%. For comparison, these tests were also performed in ambient air with the same relative humidity. Oxygen reduction current density of iron embedded in mortar increased with an increase in oxygen pressure, suggesting that the corrosion of the embedded iron is expected to be accelerated with oxygen gas pressure assuming an oxygen reduction limited corrosion current density. Iron corrosion in mortar without Cl − was minimal regardless of oxygen gas pressure. In contrast, the corrosion of iron in mortar with Cl − was accelerated with increasing the oxygen gas pressure up to a certain pressure as expected, and the thickness of the rust formed on the iron surface increased with Cl − concentration under each oxygen gas pressure, indicating that Cl − is necessary to initiate corrosion which is enhanced in the pressurized oxygen gas. However, when the oxygen pressure exceeded a certain level, the corrosion was suppressed. Electrochemical impedance spectroscopy measurement using a sensor consisting of a pair of carbon steel electrodes in mortar showed that the charge transfer resistance of the carbon steel under excessively high oxygen gas pressure became high in comparison to that at lower oxygen pressure, indicating the suppression of corrosion initiation is due to formation of a protective passive film under the excessive supply of oxygen. Consequently, the pressurized oxygen gas accelerates the corrosion of iron in mortar with Cl − ; however, excess oxygen suppresses corrosion. The optimum condition to efficiently accelerate corrosion of iron in mortar was evaluated.

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Establishment of Coupled Analysis of Interaction between Structural Deterioration and Reinforcement Corrosion by Salt Damage

Cited by 10 publications

References 14 publications

Space Averaging of Electric Field accompanying Corrosion of Reinforcement and its Verification by Pseudo-Concrete

Space Averaging of Electric Field accompanying Corrosion of Reinforcement and its Verification by Pseudo-Concrete

Space-Averaged Non-Local Analysis of Electric Potential for Polarization Reactions of Reinforcing Bars in Electrolytes

Effects of Oxygen Pressure and Chloride Ion Concentration on Corrosion of Iron in Mortar Exposed to Pressurized Humid Oxygen Gas

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