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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 Threshold Levels, Corrosion Rates and Service Life for Cracked High-Performance Concrete
Author(s): K. Pettersson and P. Sandberg
Publication: Special Publication
Appears on pages(s): 451-472
Keywords: Chlorides; corrosion; cracking (fracturing); high-performance concrete.
Abstract:Factors affecting the chloride threshold level and the active corrosion rate are reviewed, with a special emphasis on the effect of macro cracks in high performance concrete. It was found that while the initiation time in uncracked high performance concrete may be more than a hundred years, reinforced high performance concrete is likely to crack, reducing the initiation time substantially as compared with uncracked concrete. Measurements of long term corrosion rates in cracked high performance concrete indicate however, that initially high corrosion rates decrease rapidly to very low corrosion rates, in the same range as for the passive corrosion rate in uncracked concrete. Therefore the initiation time for cracked high performance concrete may be very short, but the propagation time can be very long before any critical damage will occur. As a consequence, it seems more appropriate to define the service life for cracked high performance concrete as the time to reach a certain degree of corrosion damage, instead of using the (unpredictable) initiation time.
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