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Effect of cement alkalinity on chloride threshold and time-to-corrosion of reinforcing steel in concrete
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-wt% sodium chloride (NaCl) solution and time-to-corrosion initiation, Ti was 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(-) thresholds 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 rebar-concrete interface provided the 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.
Effect of cement alkalinity on chloride threshold and time-to-corrosion of reinforcing steel in concrete
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-wt% sodium chloride (NaCl) solution and time-to-corrosion initiation, Ti was 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(-) thresholds 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 rebar-concrete interface provided the 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.
Effect of cement alkalinity on chloride threshold and time-to-corrosion of reinforcing steel in concrete
Der Einfluss der Zement-Alkalität auf den Chloridgrenzwert und den Korrosionsbeginn von Bewehrungsstahl in Beton
Hartt, W.H. (author) / Nam, J. (author)
Corrosion, Houston ; 64 ; 671-680
2008
10 Seiten, 13 Bilder, 8 Tabellen, 38 Quellen
Article (Journal)
English
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