Distribution of corrosion products at the steel-concrete interface: Influence of mill scale properties, reinforcing steel type and corrosion inducing method

• Published in: Construction & building materials Vol. 229; p. 116854
• Main Authors: Ming, Jing, Shi, Jinjie
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.12.2019
• Subjects: Corrosion pattern; Corrosion products; Low-alloy steel; Mill scale; Steel-concrete interface; Mill scale; Corrosion products; Low-alloy steel; Steel-concrete interface; Corrosion pattern
• ISSN: 0950-0618
• DOI: 10.1016/j.conbuildmat.2019.116854

•Mill scale properties have a marked impact on the distribution of corrosion products at the steel-concrete interface.•The interaction of corrosion products and mill scale is affected by steel type.•Different corrosion inducing methods result in diverse steel corrosion patterns. In this study, corrosion products of a Cr-bearing low-alloy (LA) steel and the conventional low-carbon (LC) steel with intact mill scale at the steel-concrete interface were investigated by means of backscattered electron (BSE) images. Furthermore, the effect of mill scale properties and corrosion inducing methods (long-term natural exposure to chloride solution and accelerated corrosion by chloride electromigration) on the distribution and penetration of corrosion products was compared. Complex interactions were highlighted between the corrosion products and the mill scale of LC and LA steels at the steel-concrete interface. In addition, different corrosion patterns of both steels were evident when subjected to different corrosion inducing methods.