The construction of the new One World Trade Center (WTC) in New York includes exposed steel members and bolted splice plates. Accordingly, surface preparation and coating system selection for the bolt/washer/nut assemblies for the bolted connections was critical, since the splice plates would be visible. There was little published information on surface preparation and coating requirements for ASTM A 490 black bolts. Further, since on site surface preparation of bolted connections would be costly and labor intensive, the Port Authority of New York & New Jersey (Port Authority) investigated the viability of using a proprietary pretreatment process on the bolts prior to installation and coating application, in order to minimize on-site surface preparation without adversely affecting coating system adhesion or performance.

Subject
Test methods, Primers, Coating performance, Zinc rich coatings, Protective coatings, Top coats, Galvanized coatings, Surface preparation, Pretreatment, Acrylic polyurethane, Zinc, Epoxies, Coating systems
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2010
Association for Materials Protection and Performance (AMPP)
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