Effects of AC-interference on chloride-induced corrosion of reinforced concrete. (15th April 2017)

• Record Type: Journal Article
• Authors: Brenna, Andrea; Beretta, Silvia; Bolzoni, Fabio; Pedeferri, MariaPia; Ormellese, Marco
• Is Part Of: Construction & building materials. Volume 137(2017)
• Page Start: 76
• Page End: 84
• Publication Date: 2017-04-15
• Subjects: AC interference -- Chloride -- Concrete -- Corrosion; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.01.087
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: AC interference weakens the passive layer of carbon steel in concrete. AC interference reduces the passive interval. Even at low current densities, AC decreases the [Cl − ]/[OH − ] molar ratio. Corrosion rate in concrete is negligible if AC is lower than 30 A/m 2 . Abstract: AC interference is a cause of reinforcement corrosion. Since few data are available, the influence of AC on the localized corrosion on passive carbon steel in concrete is discussed based on tests performed in alkaline solution and in concrete slabs. AC was applied in the range 10–500 A/m 2 . Results allow stating that AC interference weakens steel passivity, increasing the passive current density, reducing both the passive interval and the [Cl − ]/[OH − ] molar ratio. Results confirmed that the critical alternate current density is in the range 30–100 A/m 2, depending on the level of chlorides present into concrete.