Deterioration Rates of Minnesota Concrete Bridge Decks

Bridge decks are deteriorating across the state of Minnesota and limited funds are available to rehabilitate or replace them. The Minnesota Department of Transportation (MnDOT) Bridge Office is estimating construction costs well into the future to secure appropriate funding and to facilitate project programming. The rate at which bridge decks deteriorate is an important element used to estimate construction costs. MnDOT provided decades of inventory and inspection bridge data for this project. This included National Bridge Inventory (NBI) condition code data for 2601 bridges with concrete decks. Based on conversations with MnDOT, it was agreed that deck deterioration rates would be determined by the length of time bridge decks stay, or drop, at NBI condition codes. The authors analyzed the data to determine how many years, on average, a bridge deck remains at the various NBI condition code states. The authors also analyzed the data to determine what factors affect the rate of bridge deck deterioration. The authors looked at type of deck reinforcement (black bars, epoxy coated top bars, and all epoxy coated bars), presence of concrete overlay, average daily traffic (ADT), presence of 3 inches of cover to the top mat of reinforcement, superstructure material, and location.

• Record URL:
  http://www.lrrb.org/media/reports/201440.pdf
• Record URL:
  http://www.dot.state.mn.us/research/TS/2014/201440.pdf
• 
• Summary URL:
  http://www.dot.state.mn.us/research/TS/2014/201440TS.pdf
• Corporate Authors:

  Olson & Nesvold Engineers

  7825 Washington Avenue S, Suite 100
  Bloomington, MN  United States  55439

  Minnesota Department of Transportation

  Research Services and Library
  395 John Ireland Boulevard
  St Paul, MN  United States  55155
• Authors:
  • Nelson, Sara L
• Publication Date: 2014-10

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Tables;
• Pagination: 54p

Subject/Index Terms

• TRT Terms: Average daily traffic; Bridge decks; Data analysis; Deterioration; Material reinforcement; Overlays (Pavements)
• Identifier Terms: National Bridge Inventory
• Geographic Terms: Minnesota
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 01554208
• Record Type: Publication
• Report/Paper Numbers: MN/RC 2014-40
• Contract Numbers: (c) 02782
• Files: TRIS, ATRI, STATEDOT
• Created Date: Feb 26 2015 9:49AM