Corrosion Modeling for HPC Specifications in North Carolina

This paper will discuss how HPC is rapidly gaining prominence in highway bridge construction because of the advantages of higher strength and greater durability. Unfortunately, the concept of designing for durability is more elusive than the quest for high strength. Bridge designs often include the 100-year flood, a 475-year seismic event return-period, or perhaps a Method II vessel impact analysis, all of which target a probabilistic service life. Similarly, the design should satisfy a 100-year service life when concrete is exposed to a chloride environment. This approach has broadened the bridge corrosion protection policy in North Carolina. Unfortunately, due to the heterogeneity of concrete, arduous numerical analyses are required to predict the rate of chloride ingress within a concrete structure. In practice, such analyses are not feasible. Instead, comparative studies serve to evaluate the array of corrosion mitigation measures available with HPC. Such an investigation is conducted for North Carolina's major coastal structures, targeting a service life of 100 years. Fick’s Second Law of Diffusion is modeled to optimize the durability design by examining each structural element independently. Various applications of this law are used to predict the service life provided by different protection measures.

• Corporate Authors:

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  National Concrete Bridge Council

  Portland Cement Association, 5420 Old Orchard Road
  Skokie, IL  United States  60077-1083
• Authors:
  • Rochelle, Rodger D
• Publication Date: 2005

Language

• English

Media Info

• Media Type: Print
• Features: Tables;
• Pagination: 1p
• Monograph Title: HPC Bridge Views
• Serial:
  • HPC Bridge Views
  • Issue Number: Issues 1-38
  • Publisher: National Concrete Bridge Council
  • Serial URL: http://www.hpcbridgeviews.org

Subject/Index Terms

• TRT Terms: Bridges; Concrete bridges; Corrosion; Corrosion protection; High performance concrete; Highway bridges; Service life
• Geographic Terms: North Carolina
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01110931
• Record Type: Publication
• Files: TRIS, USDOT
• Created Date: Sep 24 2008 10:38AM