Corrosion Prevention for Extending the Service Life of Steel Bridges (2018) / Chapter Skim
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Pages 7-18
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7 This chapter takes a holistic view of alternative approaches to corrosion for steel bridges. Much of the chapter is dedicated to the choices made by designers and maintainers of steel bridges based on the synthesis survey and supplemental literature.
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8 Corrosion Prevention for Extending the Service Life of Steel Bridges local) , and importance of road (e.g., evacuation route)
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Corrosion Prevention and Control for Steel Bridges 9 Four respondents (from Kansas, New York state, Connecticut, and Maryland) reported using specific corrosion allowances in new bridge design for weathering steel structures; one of those respondents (Maryland)
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10 Corrosion Prevention for Extending the Service Life of Steel Bridges limiting factor for steel bridge service life than do designers. Roughly one-third of the designers responding said corrosion was the limiting factor for design service life of steel bridges most of the time versus roughly one-half of the maintainers.
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Corrosion Prevention and Control for Steel Bridges 11 Many maintainers responding to the survey (44%) reported that corrosion is not a warranty concern during maintenance.
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12 Corrosion Prevention for Extending the Service Life of Steel Bridges the NBI database. In other cases, the supplemental inspections were intended to define maintenance needs for planning and execution more thoroughly.
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Corrosion Prevention and Control for Steel Bridges 13 Figure 7. Survey responses regarding corrosion-maintenance decision drivers.
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14 Corrosion Prevention for Extending the Service Life of Steel Bridges Figure 8. Agencies reporting that they use various corrosion-control technologies for coated steel bridge maintenance.
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Corrosion Prevention and Control for Steel Bridges 15 How frequently does each of the following conditions contribute to the need for repainting a coated steel bridge? Figure 9.
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16 Corrosion Prevention for Extending the Service Life of Steel Bridges Strategy Reported Life or Recurrence Interval Removal of all corrosion and application of a protective coating system to the entire structure 12–35 years Removal of all corrosion and application of a protective coating system in zones to mitigate corrosion (e.g., beam ends) 3–35 years Removal of all corrosion and application of a protective coating system in zones solely for aesthetics (e.g., improve fascia appearance or prevent running rust stains)
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Corrosion Prevention and Control for Steel Bridges 17 Figure 12. Relative fabricator cost for a hypothetical as-delivered steel structure with various corrosion-control strategies.
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18 Corrosion Prevention for Extending the Service Life of Steel Bridges Premature failure required replacement before 8 years. A coating was considered in "good condition" if the average inspection rating was an ASTM D610 rating better than 7 (less than 0.3% rusting)
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