Painting Bolted Bridge Connections

From JPCL, May 2016

By Kenneth A. Trimber, KTA-Tator, Inc.

This article explains painting faying surfaces, bolt holes and fasteners on bridges in an attempt to clear up existing confusion and provide points to consider when designing and painting bolted connections....

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Tagged categories: Bolts; Bridges; Coating Application; Connections; Expansion joints; Ken Trimber; Maintenance coating work; Slip-Resistance

Comment from Anand Karamandi, (6/22/2016, 9:26 AM)

Very informative. Nice article to read. Wish I had a pdf version for my file.

Comment from BOB HEIDERSBACH, (9/14/2016, 12:19 PM)

The article states: If the shop primer is inorganic zinc, then organic zinc (rather than inorganic) should be applied to the damaged area. If the primer is organic zinc, organic zinc would typically be reapplied. WHY?

Comment from Kenneth Trimber, (9/15/2016, 1:55 PM)

Bob, inorganic zinc primers are very porous, and unlike organic zinc coatings, contain much less binder relative to the amount of zinc that’s present. If you apply inorganic zinc as a touch up material over cured inorganic zinc primer, you risk that some of the new binder will be “absorbed” by the underlying coat, leaving an insufficient amount on the surface to properly bind the newly applied zinc together. The result is a dusty surface finish with little integrity. Because of this, most specifications and manufacturer’s recommendations require the use of organic zinc (e.g. epoxy zinc) for touching up inorganic. Organic zinc has more binder and isn’t porous like inorganic zinc, so it can be applied to inorganic zinc without the same risk. It can also be applied to itself to increase film build or to repair damage in the same manner that an epoxy coating is touched up with itself.

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