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F-Files: Mechanisms of Failure
Preventing Coating Problems and Failures on Bolted Bridge Connections

From JPCL, December 2016

More items for Quality Control

By James D. Machen, KTA-Tator, Inc.

...


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Tagged categories: Coating failure; Delamination; Failure analysis; Laboratory testing; Peeling

Comment from bill wilson, (1/23/2017, 9:34 AM)

I have agree to your summary but , the word needs to get out...resent testing from the Florida DOT results show its time to look at Visco Elastic Base Coat. Conducted Adhesion Pull Off Test per ASTM D 4541 Self-Aligning Device A record 3395 psi. Tim McCullough QC Specialist II – Metals, Coatings & Timber (352) 955-6681 FDOT State Materials Office 5007 NE 39th Ave. Gainesville, FL 32609 Poor Adhesion is number one cause of disbonding or cracking of a coating. The result is a costly failure. Beam Ends and Bolts lets prevent failures.


Comment from MICHAEL DEATON, (2/1/2017, 2:54 PM)

Having been the supt. on 3 bridges (The Q bridge New Haven CT & The Innerbelt Unit 1 & 2 Cleveland OH), one having a half a million and the other 2 close to a million wax covered bolts and studs, I have a tremendous amount of experience with this subject. On the Q, solvent wiping with MEK was the spec and was performed with square abrasive pads which were dipped into the solvent and wiped vigorously to remove the blue wax coating. It worked to a certain degree although there were times where the inspection required us to go back and hit them again. The splice connections were then hand painted with 2 coats of epoxy along with the red polyurethane finish coat. The Innerbelt, unit CCG1 came from the shop in zinc so all of the bolt connections were abrasive blasted , which was quicker and cleaner, and then covered with OZIU system. CCG2, on the other hand, came from the shop in finish coat with the exception of spans 12 through 16, which came in inorganic zinc. Due to a 5 million $ computerized light set up, the finish on both unit 1 & 2 is white. Ohio specs, which are being enforced by the honorable Dave Nolans guys of QCS Inspections, are extremely tight and only allow the blue wax film to be less than 1/8 of an inch thick. CCG 2 is underway now and after extensive testing in areas utilizing power tools compared to abrasive blasting, the blasted bolts are much cleaner allowing for faster inspections and less rework ultimately, on a job this large, dropping the cost of the project by hundreds of thousands of dollars.


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