July 27, 2023
(press release)
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A final report is now published as NCHRP Research Report 1048: Corrosion Protection of Steel Bridges Using Duplex Coating Systems, which is publicly available for download. AGA participated as a project stakeholder and participated in development and review of the final report. For this project, Elzly Technology Corporation was asked to develop recommendations for corrosion protection using duplex coating systems (HDG + paint and Metallizing + paint; no powder coating) for extending the service life of steel bridges and to conduct a workshop to demonstrate the use of the recommendations to an audience of DOT staff and other stakeholders. The recommendations cover the selection and application of duplex coating systems during the design of new steel bridges and the maintenance and rehabilitation of existing steel bridges. Supplemental to the report are Appendices that provide details of the literature review, five studies, and the research results and a PowerPoint presentation with workshop training materials. For some history, you can see Project Overview from NCHRP. Overall, HDG is represented well and the report highlights some good case studies. However, this may lead to a duplex system specification within AASHTO which requires special provisions above and beyond ASTM A123 and ASTM D6386. In the meantime, it has been proposed that AISC's National Steel Bridge Alliance (NSBA) use this report as the basis for a Duplex System specifiers guide which is adopted by AASHTO, rather than have AASHTO develop it on their own. AGA is actively involved within NSBA and has offered to oversee should the alliance move in this direction. A final report is now published as NCHRP Research Report 1048: Corrosion Protection of Steel Bridges Using Duplex Coating Systems, which is publicly available for download. AGA participated as a project stakeholder and participated in development and review of the final report. For this project, Elzly Technology Corporation was asked to develop recommendations for corrosion protection using duplex coating systems (HDG + paint and Metallizing + paint; no powder coating) for extending the service life of steel bridges and to conduct a workshop to demonstrate the use of the recommendations to an audience of DOT staff and other stakeholders. The recommendations cover the selection and application of duplex coating systems during the design of new steel bridges and the maintenance and rehabilitation of existing steel bridges. Supplemental to the report are Appendices that provide details of the literature review, five studies, and the research results and a PowerPoint presentation with workshop training materials. For some history, you can see Project Overview from NCHRP. Overall, HDG is represented well and the report highlights some good case studies. However, this may lead to a duplex system specification within AASHTO which requires special provisions above and beyond ASTM A123 and ASTM D6386. In the meantime, it has been proposed that AISC's National Steel Bridge Alliance (NSBA) use this report as the basis for a Duplex System specifiers guide which is adopted by AASHTO, rather than have AASHTO develop it on their own. AGA is actively involved within NSBA and has offered to oversee should the alliance move in this direction.
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