by Eric Shoyer and Pete Ault, Elzly Technology Corporation; and Peter McDonagh and Brian Prazenka, Triborough Bridge and Tunnel Authority
Bolted joints in steel structures contain multiple crevices between the bolted members and the fasteners that are typically more susceptible to corrosion than flat surfaces, and difficult to properly coat. This article will evaluate the effectiveness of various coating practices at mitigating corrosion around these joints.
by Carl Reed and Sarah Olthof, GPI Laboratories, Inc.; and Kat Coronado and Heather Cui, International Paint, LLC
It is not uncommon during the course of abrasive-blast surface preparation to overblast and create a blast profile that is over and above the defined specification. This article describes a study that takes a closer look at the topography of a surface (before and after reblasting an over-blasted profile) and determines how this topography might affect the corrosion protection of a coating.
by Bobby Meade, Greenman Pedersen, Inc.; Derrick Castle, The Sherwin-Williams Company; and Theodore Hopwood II and Sudhir Palle, University Of Kentucky
Steel reinforced concrete bridge components are deteriorating prematurely, especially in marine and snow/ice zones of the U.S. The primary cause of this deterioration is chloride intrusion into the concrete. The authors discuss research that has shown that penetrating sealers can provide some protection to the concrete but are not as effective as thin-film coatings in retarding chloride intrusion.