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PMSS Project Details


Project ID:FHWA-PROJ-13-0040
Project Name: Steel Bridge Coatings Topics
Status: Active
Last Name:Ocel
First Name:Justin
Office: Office of Infrastructure Research and Development
Team:Bridge and Foundation Engineering Team
Roadmap/Focus area(s): Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:The project will develop a publication-ready paper to contrast the pros and cons of various steel bridge corrosion mitigation strategies. Additionally, the project will explore the frictional slip coefficients of two steel bridge coating systems that could be used in design.
Laboratories: Structures Laboratory
Start Date: August 1, 2013
End Date: November 28, 2014
There are two objectives to this project. One, to write a Federal Highway Administration (FHWA) publication-ready paper contrasting the pros and cons between conventional paint, galvanizing, and metalizing coatings on steel bridges. Two, report the slip coefficients for a rationally determined matrix of organic zinc primers and metalized coatings, along with creep testing of metalized coatings, then recommend changes to specifications based on the data.
Background Information: Since 2006, the Federal Highway Administration (FHWA) has assembled and convened a technical working group (TWG) of steel bridge representatives from industry, academia, design consultants, and fabricators. The TWG was assembled in support of the current and planned activities relating to steel bridge research, deployment, and education and assembled by FHWA in order to facilitate stakeholder input into, and to provide a continuing source of quality assurance during a new multiyear program for steel bridge research, deployment, and education.   In the last TWG meeting, some of the participants suggested FHWA consider funding research activities in steel bridge coatings with heavy consideration given to metalized coatings, as they are gaining in popularity. Two issues were highlighted by the TWG regarding this.   First was a suggestion of a white paper to contrast the pros and cons between conventional paint, galvanizing, and metalizing. This white paper would give bridge owners a good introduction into the considerations that should be used in selection of these coating systems. Second was a project looking at the slip and creep coefficients of metalized coatings as there is very little data in the open literature. However, it was suggested this be expanded to cover organic zinc primers, too. There has been a propensity of organic zinc primers to fail Class B slip resistance, when the same formulation used to pass. The new data have been anecdotally described to “just barely fail” Class B slip resistance, though much of the data was proprietary, being paid for by paint manufacturers and not available for public consumption. Therefore, there is a need to take a comprehensive, but neutral, view of the slip resistance of organic zinc primers and understand the variables that might be causing abnormalities in the slip testing results. The creep resistance of organic primers need not be investigated. It is anticipated that one of the task order recommendations may be a reduction of the Class B friction factor to a value less than 0.50. The implications to steel connection design must also be explored if this is pursued.
Test Methodology: Full-scale experimental testing.
Expected Benefits:Better information available for bridge owners to make informed decisions.
Deliverables:1. Name: Final Report and TechBrief.
Product Type(s): Research report, Techbrief
Description: A contractor's final report outlining all the data collected from all the slip coefficient and creep testing performed using organic zinc-rich primers and metalized coatings.
2. Name: TechNote
Product Type(s): Research report, Techbrief
Description: TechNote on steel bridge corrosion mitigation strategies.
Keywords: Steel Bridges
Creep Tests
Slip Coefficient
Subject Areas: Bridges and other structures