Structures Congress 2019
Nano-Particle Enriched Epoxy Primer to Enhance the Durability of Highway Steel Bridges
Publication: Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
ABSTRACT
Structural integrity of steel bridges can be compromised when it is inadequately protected from the exposure environment due to corrosion. In U.S., approximately 15% of all bridges are structurally deficient due to corrosion. Application of protective coatings has been widely used for corrosion mitigation of structural steel and zinc-rich-primer three-coat (ZRP) systems are the widely used since the 1980s. However, coating failure of ZRP has been identified within 15 years of application, well short of typical bridge design service life. Maintenance of bridge coating is costly and as estimated, annually half a billion dollar is spent only for coating maintenance of steel bridges. For these reasons durable novel coating systems are of interest. The present study aims to investigate the corrosion durability of a nanoparticle enriched zinc rich primer (NPE-ZRP) coating for steel infrastructure application in aggressive marine environment. A conventional ZRP coating was evaluated as a reference to assess the influence of nano-particles. Zinc consumption was attributed from the bulk primer layer for NPE-ZRP whereas for ZRP coating zinc consumption continues along the coating/steel interface. Comparative testing with regular ZRP showed similar positive results to date but improved performance in coating adhesive strength.
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ACKNOWLEDGEMENT
This investigation was supported by the Florida Department of Transportation. The opinions, findings, and conclusions expressed here are those of the authors and not necessarily those of the Florida Department of Transportation or the U.S. Department of Transportation.
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Published In
Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
Pages: 165 - 177
Editor: James Gregory Soules, McDermott International
ISBN (Online): 978-0-7844-8223-0
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Apr 22, 2019
Published in print: Apr 22, 2019
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