United States Department of Transportation
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Efficient Service Life Extension of Bridges through Risk-based Lifecycle Management and High-performance Construction Materials: Emphasis on Corrosion-resistant Steel
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2020-09-30
[PDF-1.93 MB]
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Edition:Final Report 02/11/2019 – 09/30/2020
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Abstract:Corrosion is responsible for structural deterioration of a large number of steel bridges. It can considerably compromise the safety and serviceability of bridges. Inspection and maintenance of corroded structures can lead to huge direct economic cost to bridge owners and significant indirect social and environmental consequences such as traffic delays and extra greenhouse gas emissions. In this project, an effective lifecycle bridge management framework is established for novel maintenance actions based on high-performance construction materials. To counteract the detrimental effects of steel corrosion, the application of high-performance construction materials emphasizes the use of A709-50CR (formerly known as A1010), a corrosion-resistant steel locally sourced in Pennsylvania. This project focuses on steel girder bridges, which are one of the most commonly used structural forms in Pennsylvania and other Region 3 states. In order to establish the overall lifecycle management framework, the project investigated and modeled the corrosion behaviors of both conventional carbon steel and A709-50CR. To ensure that the use of A709-50CR will not exert negative impacts on the environment, a comprehensive lifecycle environmental assessment was conducted to compare carbon steel and A709-50CR bridge girders. A risk-based approach was established to minimize the lifecycle maintenance cost while controlling the lifecycle risks of deteriorating bridges. By applying this approach to A709-50CR-based maintenance actions, this project investigated the use of A709-50CR girders to replace corroded carbon steel girders in aging multi-girder steel bridges. The results indicate that using A709-50CR in such major maintenance actions can achieve considerable economic and sustainability benefits. By exploring this cost-effective application of A709-50CR, the results of this project have the potential to positively impact the current practice of bridge maintenance and significantly extend the service life of steel bridges.
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