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Evaluation of corrosion of reinforcement in repaired concrete

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
Conference9th International Conference and Exhibition, Structural Faults and Repair 2001: 04 July 2001, London, U.K.
Subjectcorrosion, reinforcement, concrete; Corrosion (of reinforced concrete)
Abstract
Corrosion of steel in concrete is a complex phenomenon affected by many environmental factors. Areliable and effective non-destructive approach for assessing and predicting the state of reinforcementcorrosion in concrete has not yet been developed. Current methods do not account for the effects ofprevailing environmental conditions. Half-cell potential, linear polarization and concrete resistivitymeasurements are sensitive to the ambient environment, especially oxygen and water in concrete.Completely water-saturated concrete, for instance, can lead to oxygen starvation, resulting in corrosionpotential and current values that are lower than normally expected and provide, therefore, a poorprediction of the corrosion state. This paper presents the results of a study of the reinforcement corrosion in repaired concrete slabs taken from an old bridge in Hawkesbury, Ontario and additional results measured on electrochemical cells. Each corrosion measurement technique has its specific characteristics and limitations. The investigation showed that a better and more reliable prediction could be obtained by analyzing the data from above measurements jointly by considering the effects of environmental conditions.
Publication date
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 39305
NRC-IRC-10304
NPARC number20378703
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Record identifier64db226b-39e1-4489-ac54-15dd8f7c2dd0
Record created2012-07-24
Record modified2020-03-27
Date modified: