United States Department of Transportation
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Quantifying the Duration of the Corrosion Propagation Stage in Stainless Steel Reinforcement
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2020-11-25
[PDF-4.12 MB]
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Edition:Final Report 2/5/18 – 12/30/20
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Abstract:Present durability projections for concrete reinforced with stainless steel (SS) are limited in that, while accounting for a substantial increase in the corrosion initiation stage (CIS) duration, credit tends not to be given for any added corrosion propagation stage (CPS) duration over that of carbon steel (CS). The objectives of this work were to: (1) develop a rational quantitative estimate of the duration of the corrosion propagation stage of concrete reinforced with SS in current and anticipated FDOT practice, establishing alternative corrosion monitoring methods if needed; (2) apply the findings as inputs to damage function models to determine how any resulting added durability credit can be used to optimize materials and design options. Experiments were performed to obtain estimates of corrosion rates, corrosion morphology, and the critical corrosion penetration. The results were then used to suggest a service limit state that accounted for the mechanical properties of the steel. The results were incorporated into durability projections to provide recommendations of concrete cover to be used based on service conditions.
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