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Accession Number PB2014-101445
Title Fluorescing Coatings for Improved Inspection during Bridge Maintenance Painting.
Publication Date Oct 2012
Media Count 33p
Personal Author B. W. Meade S. Palle T. Hopwood
Abstract Optically active pigments (OAPs) fluoresce under light exposures with wavelengths (<200 to 400 nm) producing emissions in the visible spectra (380 to 740 nm). They are used as paint pigments to aid visual inspection of applied coatings for defects such as pin-holing and incomplete coverage. OAP coatings are widely used in various industries outside of bridge maintenance painting. This study addressed the laboratory evaluation and field trial of an OAP coating for KYTC bridges. OAP coatings were evaluated for inspectability and accelerated weathering performance in a laboratory test program. After successful laboratory performance, OAP coatings were specified for a KYTC bridge painting project incorporating two deck-girder bridges. One bridge was coated with an OAP zinc urethane primer/non-OAP epoxy mid-coat/OAP urethane top-coat system. The second bridge was coated with a non-OAP zinc urethane primer/OPA epoxy mid-coat/non-OAP urethane top-coat. Field observations revealed that OAP coatings improved inspectability by making uncoated and thinly coated areas more readily identifiable.
Keywords Bridge maintenance
Coatings
Defects
Exposure
Fluorescence
Paints
Pigments
Urethane
Visual inspection
Weathering


 
Source Agency Federal Highway Administration
NTIS Subject Category 50A - Highway Engineering
71E - Coatings, Colorants, & Finishes
Corporate Author Kentucky Transportation Center, Lexington. College of Engineering.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1404
Contract Number N/A

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