Modeling the kinetics of corrosion in concrete patch repairs and identification of governing parameters

Soleimani, Sahar; Ghods, Pouria; Isgor, O. Burkan; Zhang, J.

doi:10.1016/j.cemconcomp.2010.02.001

Cited by 46 publications

(17 citation statements)

References 15 publications

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“…It was expected that the limiting oxygen concentration will result in lower microcell and macrocell current. But incipient anode effect was present at low oxygen concentrations also (Soleimani et al, 2010). Researchers agree that the incipient anode formation appears in the patch repairs as a cause for its failure, but there is no unanimous opinion about the locations of its appearance and the factors that trigger its formation.…”

Section: Incipient Anode Formationmentioning

confidence: 99%

“…During patch repair, fresh alkaline repair material provides passivity to the area of steel bar present in the repair, but the rest of the steel bar in the adjacent chloride contaminated concrete continues to undergo microcell corrosion. Also, macrocell corrosion can additionally develop due to the electrochemical potential difference that arises between the repair material and substrate concrete (Soleimani et al, 2010). Both of the above corrosion mechanisms could play an important role in the failure of patch repairs.…”

Section: Corrosion Mechanism At Patch Repairsmentioning

confidence: 99%

“…Also, the penetration of chlorides through the interface creates new corrosion sites at the interface. Hence, the new corrosion sites after a repair could be formed in any one of the following three areas: on the substrate concrete, on the substrate-repair interface and within the repair itself (Barkey, 2005;Soleimani, Ghods, Isgor, & Zhang, 2010).…”

Section: Incipient Anode Formationmentioning

confidence: 99%

See 2 more Smart Citations

Performance of Concrete Patch Repairs: From a Durability Point of View

Eldho¹,

Nanayakkar²,

Xia³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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Chloride contamination in reinforced concrete leads to the corrosion of steel bars. Concrete patch repairs are widely practiced as a remedial measure for the mitigation of such corrosion in reinforced concrete structures. The performance of the patch repairs was studied by various researchers in the past. The structural and material aspects of patch repairs have received more attention than the electrochemical consequences of patch repairs in past studies. But electrochemical changes could be the underlying cause for the failure of many patch repairs. This paper reviews the performance of patch repairs from a durability point of view. It covers the formation of incipient anodes, which are the new corrosion sites formed after a patch repair process. The prevailing corrosion mechanism at the incipient anodes is discussed. The performance of patch repairs when modified with corrosion inhibitors and sacrificial anodes is examined. The importance of the selection of repair materials from a durability point is highlighted considering the electrochemical consequences of patch repair.

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Section: Incipient Anode Formationmentioning

confidence: 99%

Section: Corrosion Mechanism At Patch Repairsmentioning

confidence: 99%

Section: Incipient Anode Formationmentioning

confidence: 99%

See 1 more Smart Citation

Performance of Concrete Patch Repairs: From a Durability Point of View

Eldho¹,

Nanayakkar²,

Xia³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

View full text Add to dashboard Cite

show abstract

“…A number of researches have been reported on the corrosion of reinforcement experimentally and analyti-cally (Hsu et al 2000;Isgor and Razaqpur 2006;Ghods et al 2007;Kim and Kim 2008;Ann 2010a, 2010b;Otieno et al 2011Otieno et al , 2012Ožbolt et al 2011;Zhao et al 2012aZhao et al , 2012bZhao et al , 2014Cao 2014;Cao and Cheung 2014;Michel et al 2016). It has been discussed by coupling the electric potential governed by Laplace equation and the polarization reaction rate that can be estimated by Butler-Volmer's theorem (Bard et al 1980;Kranc and Sagüés 1997;Soleimani et al 2010). As these thermodynamic laws are simply robust, the affinity with the prediction of corrosion rate at the member level has been recognized to some extent, and the mainstream of analysis has formed up to today.…”

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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“…Although PMM was said able to withstand corrosion attack in repaired concrete structures [5], [6] chloride ions that already existed in substrate concrete especially when it deals with the electrochemical process that consequently contributes to the microstructure changes. A better understanding on this matter is needed since [1], [6] had concerned about the ring-anode effect. The ring-anode effect is said the cause that contributed to macrocell corrosion (macrocell cathode) formed between the steel in repaired concrete and steel in the substrate (macrocell anode).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of patch-repaired RC under influenced of chloride ions

Malek¹,

Hattori²,

Kawano³

et al. 2017

AIP Conference Proceedings

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Abstract.One of the key performances of repaired reinforced concrete is its ability to withstand corrosion due to harmful ions and should be compatible with substrate and repaired concrete structures. This research investigates the prediction of corrosion risk on repaired RC by comparing performance between PMM and conventional OPC as chosen materials for repairing RC structures under influenced of chloride ions. The effect of chloride ions on repaired RC will be analyzed according to microstructural analysis, half-cell potential and chloride content by weight of cement. For analysis, substrate concrete containing 9 kg/m 3 chloride ions with W/C ratio 60% acts as the reference specimen. Meanwhile, for comparison purpose; two conditions of repaired RC namely OPC with W/C ratio 40% (R-0.4OPC) and PMM (R-PMM) that contain chloride free ions using similar casting and curing techniques were prepared respectively. Based on the results obtained, porosity and microstructural images using BSE were alternated under influenced of chloride ions since it correlated with surface charge of CSH due to Ca/Si amount in each specimen. The correlation between free and total chloride ions in concrete reveals the phenomena of co-matrix in R-PMM specimen since least chloride ions found in repaired section compared to R-0.4OPC specimen. The most striking result is R-PMM specimen able to resist chloride ions ingress in its repaired section but for HCP results obtained the R-PMM specimen beyond its threshold of passivity even though its porosity value is the lowest. To sum up, penetration of chloride ions throughout the specimens according to the wet chemical analysis giving effects to the porosity and microstructure. The R-PMM specimen was good in resistance of chloride ions to the repaired part but it was not the final predictions on its ability to withstand corrosion resistance.

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Modeling the kinetics of corrosion in concrete patch repairs and identification of governing parameters

Cited by 46 publications

References 15 publications

Performance of Concrete Patch Repairs: From a Durability Point of View

Performance of Concrete Patch Repairs: From a Durability Point of View

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

Characteristics of patch-repaired RC under influenced of chloride ions

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