Abstract
Use of stainless steel rebar for concrete reinforcement is increasing worldwide. The enhanced properties of stainless steel prove to be a viable solution when life cycle costs of the structures are taken into account. Austenitic and duplex stainless steels are used as rebar because they present an excellent combination of corrosion resistance in concrete, high strength and good ductility. Stainless steel reinforcements are compared with conventional carbon steel reinforcements to point out the specificities and advantages of the stainless steel solution. The influence of the fabrication method (hot or cold rolling) on microstructure, strength and ductility is also discussed. The resistance to pitting corrosion of various stainless steels has been evaluated in the laboratory by electrochemical tests. This helps to select the most suitable grade according to the environment in which the concrete structure is located and the risks of exposure to aggressive atmospheres and attack during its life. The studied grades are: 1.4301, 1.4311, 1.4404, 1.4429, 1.4362 and 1.4462. The tests were carried out at pH between 8 and 12 in chloride-containing solutions to simulate the concrete pore liquid in a seawater environment or penetration by road de-icing salts. A classification of the selected austenitic and duplex grades was created.
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