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51318-11312-Stainless steel rebar for marine environment: a study of galvanic corrosion with carbon steel rebar used in the same concrete structure

This work aims at comparing a performance of the UNS(1) S32304 lean-duplex stainless steel rebars in electrical contact with carbon steel rebars, both embedded in concrete subjected to a chloride ion contamination.

Product Number: 51318-11312-SG
Author: Juliana Lopes Cardoso / Adriana de Araujo / Mayara Stecanella Pacheco / Jose Luis Serra Ribeiro / Zehbour Panossian
Publication Date: 2018
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Stainless steel rebars are used in constructions installed under high aggressive conditions, such as marine atmospheres or areas with intense usage of de-icing salts. These rebars are preferred when the service life required is over 100 years or there are maintenance restrictions as inaccessibility to a structure, high costs and disturbances for a population. Due to a high initial cost, the use of stainless steel rebars is restricted to the outside layer of a concrete structure directly subjected to chloride contamination while, in other areas, carbon steel rebars are used. If these different metals are in contact with each other inside reinforced concrete, galvanic corrosion between the outside stainless steel and the inside carbon steel is a concern. This work aims at comparing a performance of the UNS(1) S32304 lean-duplex stainless steel rebars in electrical contact with carbon steel rebars, both embedded in concrete subjected to a chloride ion contamination. UNS S30400 stainless steel coupled with carbon steel was studied as a reference. The three steels were also studied individually for a comparison purpose. A test-specimen configuration and a contamination process were established based on ASTM(2) A955:2015 and ASTM G109:2007 standards. The one-year results are presented and discussed.

Key words: stainless steel; reinforcement; concrete; rebar; marine environment; structure; reinforcing bar; chloride

Stainless steel rebars are used in constructions installed under high aggressive conditions, such as marine atmospheres or areas with intense usage of de-icing salts. These rebars are preferred when the service life required is over 100 years or there are maintenance restrictions as inaccessibility to a structure, high costs and disturbances for a population. Due to a high initial cost, the use of stainless steel rebars is restricted to the outside layer of a concrete structure directly subjected to chloride contamination while, in other areas, carbon steel rebars are used. If these different metals are in contact with each other inside reinforced concrete, galvanic corrosion between the outside stainless steel and the inside carbon steel is a concern. This work aims at comparing a performance of the UNS(1) S32304 lean-duplex stainless steel rebars in electrical contact with carbon steel rebars, both embedded in concrete subjected to a chloride ion contamination. UNS S30400 stainless steel coupled with carbon steel was studied as a reference. The three steels were also studied individually for a comparison purpose. A test-specimen configuration and a contamination process were established based on ASTM(2) A955:2015 and ASTM G109:2007 standards. The one-year results are presented and discussed.

Key words: stainless steel; reinforcement; concrete; rebar; marine environment; structure; reinforcing bar; chloride

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