Why Does Steel in Concrete Corrode?

Steel in concrete is usually in a no corroding, passive condition. However, steel – reinforced concrete is often used in severe environments where sea water or deicing salts are present. When chloride moves into the concrete, it disrupts the passive layer protecting the steel, causing it to rust or pit.
The first defense against corrosion of steel in concrete is quality concrete and sufficient concrete cover over the reinforcing bars. Concrete with a lower water to cement ratio will help slow down the penetration of chloride salts and the development of carbonation. It is also recommended to use specially designed mixes along with admixtures based on the conditions.
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