United States Department of Transportation
i
Assessment of ODOT’s conduit service life prediction methodology.
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2016-09-01
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[PDF-30.27 MB]
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Abstract:Shad Sargand (ORCID 0000-0002-1633-1045), John Hurd, Kevin White
(ORCID 0000-0002-2902-2524), Teruhisa Masada (ORCID 0000-0002-
3312-3037), Johnnatan Garcia-Ruiz (ORCID 0000-0002-2414-6608), and
Gabriel Colorado-Urrea (ORCID 0000-0002-7693-6644)
This study aimed to determine the effectiveness of 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 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.
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