10128 Approach to Modeling Corrosion Progression of Epoxy Coated Rebar in Structures with Cracked Concrete

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Product Number: 51300-10128-SG

ISBN: 10128 2010 CP

Author: Kingsley Lau and Alberto A Sagüés

Publication Date: 2010

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The extent of corrosion of epoxy coated rebar, ECR, in marine bridges was found to be generally correlated with concrete chloride diffusivity, D_App, where significant corrosion was observed at bridges with D_App as high as 10^-7cm²/s but not for sound concrete locations in bridges with D_App as low as 10^-9cm²/s. However, significant corrosion was observed in several pre-existing cracked concrete locations of a low D_App bridge. In such environment, well manifested enhanced chloride penetration occurs through the preexisting cracks. Early corrosion could then initiate for ECR with coating defects and extended coating disbondment. An initial model formulation that may serve as a starting point for quantitative corrosion forecasting of possible damage in those cases is introduced. Exploratory projections indicate that, as expected, relatively isolated cracking should only create topical concrete damage with modest maintenance requirements. However, if the crack orientation with respect to the rebar were adverse and chloride transport were greatly enhanced (as it could be expected in relatively wide cracks), projected corrosion damage could be more substantial.

Keywords: concrete, corrosion, crack, modeling, rebar, durability, epoxy