United States Department of Transportation
i
Synthesis of Galvanized Steel Reinforcement Corrosion Performance
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2022-06-23
[PDF-756.56 KB]
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Edition:Final Report
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Abstract:Hot dipped galvanized steel rebar (HDGR) is an alternative to plain carbon steel often considered for concrete reinforcement. The zinc rich layer serves as a sacrificial coating protecting the underlying carbon steel. While there is information reporting benefits from increased chloride threshold and reduced corrosion rates, there is also uncertainty regarding the conditions required to ensure this benefit and also avoid possible performance deficiency. Therefore prior to possible approval and implementation of this material in aggressive marine environments of interest to FDOT, existing evidence on HDGR corrosion performance needs to be evaluated. This report is a synthesis review of the technical literature, conducted per request of the FDOT, towards a determination of whether to eventually allow the use of HDGR to increase durability. The performance evidence reviewed was indicative of the need for further field exposure and experimental testing prior to consider specification of the material. A phased approach to that end was proposed for consideration.
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