by Sarah K. Sondag, P.E., Senior Engineer, Minnesota Department of Transportation, and Richard A. Burgess, PCS, Senior Coatings Consultant, KTA-Tator, Inc.
In 2013, MnDOT concluded that it needed a more uniform method to rate the condition of coatings statewide during the biennial bridge safety inspections and a process to select and prioritize maintenance painting strategies. This article describes outcomes of the objectives undertaken and MnDOT’s novel approach to improving statewide bridge maintenance painting operations.
by Ahren Olson and Todd Williams, Covestro LLC; Mark Hudson, The Sherwin-Williams Company; C. Wayne Fleming, Virginia Department of Transportation
Over the past decade, more than 100 steel bridges in the state of Virginia have been repainted with two-coat polyaspartic urethane coatings. The authors discuss the advantages and disadvantages of using two-coat polyaspartic coatings for repainting of steel bridges.
by Vaughn O’Dea, Cory Brown and Anthony Dallen, Tnemec Company, Inc.
The authors present the common pull-off adhesion test methods used for concrete substrates in the U.S., make the case that no tensile strength testing method specifically addresses a protective coating applied over a cementitious resurfacer or repair mortar and make recommendations accordingly.