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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Chloride Penetration into Offshore Concrete and Corrosion Risks
Author(s): G. De Wind and P. Stroeven
Publication: Special Publication
Appears on pages(s): 1679-1690
Keywords: chlorides; concrete durability; corrosion; cover; diffusion; offshore structures; oxygen; reinforcing steels; saturation; General
Abstract:The oxygen flux through concrete saturated with water has been calculated by means of the theoretically determined diffusion constant. Presuming oxygen diffusion to be the rate-controlling step, it is concluded, based on this flux, that the corrosion of reinforcement in the underwater zone is negligible. This holds also if the chloride concentration at the surface of the embedded steel exceeds the 0.4 percent by weight of cement level. The calculations are confirmed by analyses carried out on a 35-year-old concrete sea structure that is, until now, the most extensively examined one. In the splash zone of the structure, the chloride concentrations at the surfaces of the reinforcements far exceed the 0.4 percent level. In this zone there is corrosion only in places where depth of cover or quality of concrete are inadequate. Calculation of the oxygen fluxes with the help of diffusion coefficients, taken from the literature, shows that the corrosive attack would be too severe even at a relative humidity of 90 percent. This indicates that the durability of offshore concretes in the splash zone iscontrolled by a thin layer of material saturated with water.
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