Title

Corrosion behaviour of stainless steel in concrete exposed to carbonation

College

Gokongwei College of Engineering

Document Type

Other

Abstract

The study investigated the corrosion behaviour of stainless steel in concrete exposed to carbonation. Three types of steel, SUS304 (18% Cr), SUS410L (12% Cr) and ordinary carbon steel SD295A, were cast in several OPC-concrete scenarios. The following were observed: (1) Both stainless steels were unaffected by carbonation in concrete with proper cover even with high water/cement ratio (0.7w/c) and high temperature exposure (40oC). (2) Galvanic effect was observed and enhanced by carbonation though was not a great corrosion threat for steels; while early ingress of carbonation (due to thin cover) served as corrosion threat for the economical SUS410L stainless steel; while both stainless steels remained passive at pH 8 solution. Overall, carbonation was not a great threat for stainless steels; however, some factors enhanced its effects. The new economical stainless steels (ex. SUS410L) with lowered chromium content merit caution when used in carbonated environments, especially in thin cover scenarios.

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Disciplines

Civil Engineering | Materials Science and Engineering

Keywords

Concrete—Corrosion; Stainless steel—Corrosion; Carbon dioxide

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