09211 Numerical Analysis of the Effect of Diffusive Coarse Aggregates on Reinforcing Steel Corrosion Initiation

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Product Number: 51300-09211-SG

ISBN: 09211 2009 CP

Author: William H. Hartt and Hui Yu

Publication Date: 2009

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The exposure time at which a threshold Cl- concentration, Ct, is initially achieved at the reinforcement depth in concrete such that passivity is compromised and active corrosion initiates, Ti, is an important service life determinant for reinforced concrete structures. Composite component of concrete materials results in no consensus in the literature of a value for Ct, as reported concentrations extend over one order of magnitude, which was contributed to multi-parameter interaction. However, there is; and it has become increasingly apparent that Ct is distributed even for apparently identical specimens. In a companion paper, models for randomly arranged non-diffusive coarse aggregate (CA) particles in concrete cover were generated for different aggregate types (particle size and size distribution), CA cover depth, the ratio of chloride threshold to surface chloride and the effect of these factors on the corrosion initiation of reinforcing steel was investigated as a function of Ct by finite element analysis. In the present work, the effect of CA with finite diffusivity on corrosion initiation is addressed and the results are discussed with those presented in previous paper. Discussion within the context of understanding factors that affect the relatively wide variation in Ct that has been reported in the experimental and modeling literature is also involved.

Keywords: concrete, reinforcing steel, corrosion, chlorides, finite diffusivity, coarse aggregate; modeling analysis.