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Demonstration and Validation of Advanced Rebar Materials in Salt-Exposure Applications:Final Report on Project F09-AR13

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Military installations maintain networks of roads and bridges that comprise basic, mission-critical infrastructure required for everyday operations. Many reinforced concrete bridges are long overdue for repair or replacement due to various stressors and corrosion mechanisms that have degraded the steel reinforcement and, therefore, reduced load-carrying capacity. These stressors include cyclic loading, freezethaw cycles, and penetration of water and road deicing salts that greatly accelerate both corrosion and concrete fracturing. This report presents the findings of a demonstrationvalidation project at Fort Knox, KY, in which two different advanced corrosion-resistant reinforcement materials were used in reconstructed concrete bridge decks. Material performance was monitored for 18 months using sensors to return data on corrosion potential, corrosion rate, and chloride penetration thresholds. These data also were collected from a control structure reinforced with conventional carbon steel rebar, and analyses were executed to compare material performance. Exposure testing of material specimens in highly corrosive environments was performed concurrently. Both demonstrated rebar materials have shown good corrosion resistance in the bridge decks and exposure coupon racks. Continuing periodic observation of the demonstration structures is recommended to produce more definitive performance results. Economic analysis of both materials show a positive return on investment over carbon steel rebar.

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Technical Report



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Approved For Public Release;

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