A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Chloride corrosion threshold of reinforcing steel in alkaline solutions - Effect of specimen size
The effect of specimen surface area (S), varied by 3 orders of magnitude, on the pitting and repassivation potentials of concrete reinforcing steel specimens in alkaline solutions was determined using the conventional cyclic polarization technique. For most of the conditions examined, the pitting potential (Ep) was found to decrease significantly with increasing S; a slope as high as approx. 0.3 V per area decade was observed for steel with a 600-grit surface finish in saturated calcium hydroxide (Ca(OH)2) solution with 0.1 ? and 1.0 ? sodium chloride (NaCl). The repassivation potential and the variability of Ep, however, were independent of specimen surface area. The experimental observation was reasonably explained with a simple probability model. The steel surface finish was an independent factor that also strongly affected Ep. The findings indicate that chloride corrosion threshold values inferred from tests with typically small laboratory specimens may be not conservative enough when applied to full-sized structures. Alternative treatments using a distribution of threshold values merit consideration.
Chloride corrosion threshold of reinforcing steel in alkaline solutions - Effect of specimen size
The effect of specimen surface area (S), varied by 3 orders of magnitude, on the pitting and repassivation potentials of concrete reinforcing steel specimens in alkaline solutions was determined using the conventional cyclic polarization technique. For most of the conditions examined, the pitting potential (Ep) was found to decrease significantly with increasing S; a slope as high as approx. 0.3 V per area decade was observed for steel with a 600-grit surface finish in saturated calcium hydroxide (Ca(OH)2) solution with 0.1 ? and 1.0 ? sodium chloride (NaCl). The repassivation potential and the variability of Ep, however, were independent of specimen surface area. The experimental observation was reasonably explained with a simple probability model. The steel surface finish was an independent factor that also strongly affected Ep. The findings indicate that chloride corrosion threshold values inferred from tests with typically small laboratory specimens may be not conservative enough when applied to full-sized structures. Alternative treatments using a distribution of threshold values merit consideration.
Chloride corrosion threshold of reinforcing steel in alkaline solutions - Effect of specimen size
Schwellenwert der Chloridkorrosion von Armierungsstahl in alkalischen Lösungen - Einfluss der Probengröße
Li, L. (author) / Sagües, A.A. (author)
Corrosion, Houston ; 60 ; 195-202
2004
8 Seiten, 16 Bilder, 22 Quellen
Article (Journal)
English
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