Effect of initial curing on corrosion behavior on steel bars in FA concrete under dry and wet actions

Author(s): Wakako Sugino, Keiyuu Kawaai, Isao Ujike
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 159-164
Total Pages: 6
Language : English

Abstract: This study reports on the effect of initial curing on the corrosion behavior in Fly ash (FA) concrete, which was examined through chloride-induced corrosion tests induced by dry and wet cycles. After 182 days of the corrosion tests, corrosion properties in the specimens cured under dry or wet conditions including (sealed moist curing and water curing) were examined based on cathodic polarization properties, half-cell potential, and microcell and macrocell corrosion current density. In particular, detailed analysis was carried out on the resistance against ingress of corrosive substances such as moisture and dissolved oxygen via cathodic polarization measurements in determining the rate of oxygen permeability on embedded steel bars. It is noted that segmented steel bars comprising two steel elements (steel element-I closer to the exposed surface; steel element-II far from the exposed surface) was embedded in the specimens. Based on the results obtained in this study, the results suggest that the macrocell corrosion observed in water cured specimens could be triggered by oxygen concentration cell actions.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00