United States Department of Transportation
i
Interlaboratory Variability of Slip Coefficient Testing for Bridge Coatings
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2014-12-01
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[PDF-2.55 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:All steel bridge systems need some type of a corrosion protection scheme to ensure a serviceable life. The most common approach is to use a multilayered paint system with a zinc-rich primer. In addition to corrosion performance, other factors need to be considered in the selection of the corrosion protection system. Steel bridges are usually fabricated in smaller components and assembled onsite using high-strength bolted connections with slip-critical connections. Slip-critical connections use the high clamping force of the bolt to develop frictional shear stresses in excess of the load demand such that slip within the connection would not be expected under service loads. Primers used on faying surfaces of slip-critical connections must demonstrate a predetermined level of slip resistance in accordance with the Research Council of Structural Connections (RCSC). This study seeks to evaluate the details of the RCSC slip test specification as applied by four different laboratories. A commonly manufactured set of test panels spanning five typical organic zinc-rich primers was tested independently and in parallel by four laboratories. The data were compared, and subtle yet important variations in test approach taken by each lab are discussed. Recommendations are provided for revisions to the RCSC test protocol to reduce variability.
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