United States Department of Transportation
i
Corrosion Durability of Reinforced Concrete Utilizing UHPC for ABC Applications
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2019-03-01
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[PDF-2.59 MB]
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Edition:Final Report (March 2017- April 2019)
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Abstract:In the United States, ~30% of the ~600,000 highway bridges are labeled structurally deficient or functionally obsolete. Approximately 65% of the bridges in the United State are reinforced concrete, of which 40% are classified as structurally deficient or functionally obsolete. Many of these bridges are damaged due to chloride induced corrosion of the reinforcing steel. Structural members damaged by corrosion are typically repaired by removal of delaminated concrete and application of repair patches or jackets, but traditional repair methods have limitations due to the presence of incipient anodes after removal of the damaged concrete and replacement with chloride-free repair material. The development and application of effective repair methods and durable materials aiming at extending the lifetime of both existing and new structures is a critical issue. The enhanced mechanical and low permeability characteristics of ultra-high-performance concrete (UHPC) have been widely reported and make UHPC a material of interest for structural applications including rehabilitation of concrete structures. Application of UHPC can potentially result in both technical and economic advantages, including decreased reinforcement corrosion activity and an increase in service life. Because it is becoming more common to apply UHPC for rehabilitation to improve strength, improved protection against corrosion would serve as a complimentary benefit of this treatment. Experimental research on the corrosion durability of a proposed Accelerated Bridge Construction (ABC) solution to repair reinforced concrete elements in marine environments utilizing UHPC is presented in this report.
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Content Notes:ABC-UTC Project: Corrosion Durability of Reinforced Concrete Utilizing UHPC for ABC Applications
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