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

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DOIResolve DOI: http://doi.org/10.1016/j.cemconcomp.2010.02.001
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TypeArticle
Journal titleCement and Concrete Composites
Volume32
Issue5
Pages360368; # of pages: 9
SubjectReinforcement (D); Corrosion (C); Modeling (E); Electrical properties (C); Patch repair; Concrete
AbstractPatch repair is a commonly used method for rectifying localized corrosion damage in reinforced concrete members. The ring-anode effect, which is corrosion at the intersection between the substrate and the repaired concrete as a result of the electrochemical imbalance, however, is a commonly observed failure mechanism after patch repairs. In this study, the kinetics of the corrosion in the ring-anode zones of repaired concrete structures is investigated by numerical modeling. All simulations, in agreement with the existing experimental and in situ observations, have demonstrated the formation of a ring-anode zone in the 2-5 cm portion of the substrate from the interface. Furthermore, the anodic current density in the ring-anode zone is found to have a peak near the repaired concrete and asymptotically approaches to the corrosion density observed in the substrate before the patch repair. More importantly, the simulations demonstrate quantitatively how various parameters affect the ring-anode corrosion. It was found that concrete resistivity is the most significant factor that influences the magnitude of macrocell corrosion, followed by the availability of oxygen in the patch. It was observed that the ring-anode effect is a localized problem; hence the size of the patch and the cover thickness are not significant factors affecting the phenomenon. The investigations of the importance of these factors provide useful information for field practice.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number53571
21243
NPARC number20374227
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Record identifierf39da580-4209-4516-b9b8-2e6d9bfd2bf3
Record created2012-07-23
Record modified2016-05-09
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