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08321 Modeling Analysis for the Effects of Non-Diffusive Coarse Aggregates on Time-to-Corrosion and Corrosion Initiation Sites

Picture for 08321Modeling Analysis for the Effects of Non-Diffusive Coarse Aggregates on Time-to-Corrosion
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Product Number: 51300-08321-SG
ISBN: 08321 2008 CP
Author: William H. Hartt and Hui Yu
Publication Date: 2008
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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. However, there is no consensus in the literature of a value for Ct, as reported concentrations extend over one order of magnitude; and it has become increasingly apparent that Ct is distributed even for apparently identical specimens. In this research, models for randomly arranged coarse aggregate (CA) particles in concrete cover were generated for different aggregate types (particle size and size distribution), CA volume fraction, and cover; and the effect of these factors on the time and location along the reinforcement at which Ct is initially achieved was investigated as a function of Ct by finite element analysis. The results are discussed within the context of factors that contribute to the reported variability in Ct.
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. However, there is no consensus in the literature of a value for Ct, as reported concentrations extend over one order of magnitude; and it has become increasingly apparent that Ct is distributed even for apparently identical specimens. In this research, models for randomly arranged coarse aggregate (CA) particles in concrete cover were generated for different aggregate types (particle size and size distribution), CA volume fraction, and cover; and the effect of these factors on the time and location along the reinforcement at which Ct is initially achieved was investigated as a function of Ct by finite element analysis. The results are discussed within the context of factors that contribute to the reported variability in Ct.
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