Corrosion of Reinforcing Steel in Concrete Exposed to Sea Air


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Title: Corrosion of Reinforcing Steel in Concrete Exposed to Sea Air

Author(s): Toshitaka Ohta

Publication: Special Publication

Volume: 126


Appears on pages(s): 459-478

Keywords: chlorides; concretes; corrosion; cracking (fracturing); deterioration; durability; marine atmospheres; reinforced concrete; reinforcing steel; Materials Research

Date: 8/1/1991

Long-term exposure test results of reinforced concrete beams are reported. One hundred forty-nine pairs of beams with open cracks were exposed to sea air for 2 to 20 years. The main variables were thickness of concrete cover, type of cement, cement content (water/cement), and crack width. The type of cement has a great influence on the depth of chloride ion penetration. The thickness of concrete cover is the most important factor in the prevention of corrosion of the reinforcing steel. With a thin cover, the crack width has no influence on corrosion of reinforcing steel. Epoxy coating is effective in improving corrosion protection. Measurements of electrical potential on the surface of concrete give valuable information on corrosion activity of reinforcing steel.