Assessment of ODOT’s Conduit Service Life Prediction Methodology

This study aimed to determine the effectiveness of Ohio Department of Transportation's (ODOT’s) current method for estimating the service life of culverts and look at possible alternatives. The research team conducted a literature review and examined other culvert rating systems. The team created a set of new inspection report forms for culverts which were utilized to inspect 214 culverts (96 concrete, 86 steel, and 32 thermoplastic) selected from the ODOT culvert inventory database and located in ten of ODOT’s twelve districts and 35 counties. Culverts were rated using scales currently used by ODOT and one developed by Ohio Research Institute for Transportation and the Environment (ORITE) [Mitchell et al., 2005]; concrete culverts were also rated using a scale developed by Hurd [1985]. The data collected were augmented with data from earlier studies translated into the rating scales used in this project. A multivariate regression analysis was conducted on each type of culvert for acidic (pH < 7.0) and alkaline (pH > 7.0) environments (thermoplastic culverts were combined into a single set regardless of pH). It was determined that the best fits were provided by linear regression models. The low-pH data sets had models with higher correlation coefficients, and it was determined that the ODOT rating systems provided more accurate predictions than did the ORITE scale except for concrete culverts in alkaline environments. A modified Los Angeles abrasion test was used to compare abrasion resistance polymer, bituminous, Aluminized, and standard galvanized coatings on steel plates. The polymer coating showed the least mass loss from abrasion, followed by bituminous, Aluminized, and galvanized, but these results may not reflect actual field conditions which include freeze-thaw cycles and aging.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Maps; Photos; References; Tables;
  • Pagination: 216p

Subject/Index Terms

Filing Info

  • Accession Number: 01630104
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/OH-2016/16
  • Contract Numbers: SJN 134725
  • Files: NTL, TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Feb 15 2017 12:06PM