New perspectives on electrochemical incompatibility of patch repairs of concrete structures

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ConferenceCONFERENCE: 2007 Northern Area Eastern Conference - Innovation in Corrosion Control: 23 September 2007, Ottawa, Ontario
Pages113; # of pages: 13
Subjectpatch repair; electrochemical incompatibility; corrosion; macrocell; microcell; corrosion kinetics; concrete structures; reinforcing steel; Concrete
AbstractPatch repair is commonly used to rectify localized corrosion induced damage in concrete structures. However, inadequate durability in patch repair systems caused by new corrosion attack is very common. The prevailing understanding of the corrosion mechanism in patch repair is that the electrochemical incompatibility is the main reason for the initiation of macrocell corrosion between the patch area and substrate. This paper proposes new perspectives on the concept of electrochemical incompatibility considering corrosion kinetics in patch repair systems. It is illustrated, by both electrochemical principles and experimental verification, that although the incompatibility serves as the driving force for the macrocelll corrosion, the corrosion rate depends more on the individual corrosion kinetics of the anode or cathode. It concluded that both macrocell and microcell corrosion mechanisms could play significant roles in the deterioration of patch repairs, and the total corrosion risk could be underestimated if the microcell corrosion mechanism is overlooked.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number49699
NPARC number20378381
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Record identifier103f1dc1-2823-45ca-a0f8-2944d3aaf1ef
Record created2012-07-24
Record modified2016-05-09
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