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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: Silica Concrete - Protection Against Corrosion of Embedded Steel
Author(s): 0ystein Vennesland and Odd E. Gjorv
Publication: Special Publication
Appears on pages(s): 719-730
Keywords: carbonation; corrosion resistance; electrical resistance;
oxygen; porosity; reinforced concrete; reinforcing steels; silica.
Abstract:The good ability of concrete to protect embedded steel against corrosion is mainly due to the high alkalinity of the pore water of the concrete, which provides a passive, noncorroding state of the embedded steel If this passivity of the steel is broken - either by carbonation or by the presence of chloride ions the corrosion of the steel will mainly be controlled by the electrical resistivity of the concrete and the rate of oxygen transport through the concrete to the steel. The present paper describes a study on how additions of up to 20% condensed silica fume by weight of cement affect the rate of carbonation, electrical resistivity and rate of oxygen transport through water-saturated concrete. It was found that the effect of silica on the parameters studied varied within wide limits, The rate of oxygen transport was only slightly affected while the rate of carbonation was somwhat reduced. The most pronounced effect of silica was found on the electrical resistivity which is increased by up to 190-1600% for cement contents varying from 100 to 400 kg/m3, respectively.
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