Sensitivity analysis of simplified diffusion-based corrosion initiation model of concrete structures exposed to chlorides

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DOIResolve DOI: http://doi.org/10.1016/j.cemconres.2006.01.015
AuthorSearch for: ; Search for:
TypeArticle
Journal titleCement and Concrete Research
Volume36
IssueJuly 7
Pages13121323; # of pages: 12
Subjectcorrosion, chloride diffusion, fick's second law, Crank's solution, sensitivity; Corrosion (of reinforced concrete)
AbstractThis paper presents the results of a sensitivity analysis of the diffusion-based corrosion initiation model for reinforced concrete structures built in chloride-laden environments. Analytical differentiation techniques are used to determine the sensitivity of the time to corrosion initiation to the four governing parameters of the model, which include chloride diffusivity in concrete, chloride threshold level of steel reinforcement, concrete cover depth, and surface chloride concentration. For conventional carbon steel, the time to corrosion initiation is found to be most sensitive to concrete cover depth, followed by chloride diffusion coefficient, with normalized sensitivity coefficients of about 2 and -1. For corrosion-resistant steels, the time to corrosion initiation is most sensitive to the surface chloride concentration and chloride threshold level followed by the concrete cover depth and chloride diffusion coefficient. The results of this sensitivity analysis are discussed in detail, including the variations in predicted time to corrosion initiation induced by variations of the four model parameters and their implications for design and maintenance of concrete structures built in corrosive environments.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number48373
17848
NPARC number20378115
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Record identifier5459ffe7-0f36-4937-a135-821b73cf81fc
Record created2012-07-24
Record modified2016-05-09
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