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08322 Effect of Cement Alkalinity and Concrete Microstructure Upon Chloride Threshold for Corrosion Initiation of Reinforcing Steel in Concrete

Picture for 08322 Effect of Cement Alkalinity and Concrete Microstructure Upon Chloride Threshold for Corrosion
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Product Number: 51300-08322-SG
ISBN: 08322 2008 CP
Author: William H. Hartt and Jingak Nam
Publication Date: 2008
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A series of reinforced G109 type concrete specimens with cement of equivalent alkalinity (EqA) either 1.08 or 0.32 was cyclically ponded with a 15 w/o NaCl solution and time-to-corrosion initiation, Ti, determined. The specimens were subsequently dissected, the steel-concrete interface examined and characterized, and concrete along the top of the upper rebar sampled and analyzed for Cl-. The results revealed greater Ti and Cl- threshold for corrosion initiation, [Cl-]th, for the higher EqA specimens; however, the data were scattered for seemingly identical specimens. In many instances, corrosion initiated preferentially at entrapped air voids at the rebarconcrete interface provided diameter of these was = 2.5 mm. An explanation is proposed for the site specificity of corrosion initiation and scattered [Cl-]th that considers both entrapped air voids and the spatial distribution of coarse aggregates within the Cl- ingress path.
A series of reinforced G109 type concrete specimens with cement of equivalent alkalinity (EqA) either 1.08 or 0.32 was cyclically ponded with a 15 w/o NaCl solution and time-to-corrosion initiation, Ti, determined. The specimens were subsequently dissected, the steel-concrete interface examined and characterized, and concrete along the top of the upper rebar sampled and analyzed for Cl-. The results revealed greater Ti and Cl- threshold for corrosion initiation, [Cl-]th, for the higher EqA specimens; however, the data were scattered for seemingly identical specimens. In many instances, corrosion initiated preferentially at entrapped air voids at the rebarconcrete interface provided diameter of these was = 2.5 mm. An explanation is proposed for the site specificity of corrosion initiation and scattered [Cl-]th that considers both entrapped air voids and the spatial distribution of coarse aggregates within the Cl- ingress path.
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