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Outdoor Performance of One-Coat Systems Applicable to New Steel Bridges

Outdoor Performance of One-Coat Systems Applicable to New Steel Bridges
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A two-year FHWA one-coat study was launched in November 2006 to evaluate various commercially available coating materials that can be applied as one-coat systems to new steel bridges. Seven one-coat systems, a 3-coat and a 2-coat control were selected and tested in three outdoor environments. 

Product Number: 41210-545-SG
Author: Yuan Yao, Seung-Kyoung Lee, Bob Kogler
Publication Date: 2010
Industry: Coatings
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$20.00
$20.00

A two-year FHWA one-coat study was launched in November 2006 to evaluate various commercially available coating materials that can be applied as one-coat systems to new steel bridges. Seven one-coat systems, a 3-coat and a 2-coat control were selected and tested in three outdoor environments. After 24 months in marine environment and 18 months in natural weathering exposures in Virginia, the one-coat systems exhibited different degrees of deterioration. Except for urethane mastic, which developed eight medium size blisters and G5 grade rusting after exposed in the marine environment, most of the one-coat systems showed virtually no surface failures. The final mean rust creepage at the scribe ranged from around 2 mm for most of the one-coat systems to 30 mm for polysiloxane. When viewed collectively, none of the one-coat systems performed as well as the 3-coat control in the outdoor exposures.

A two-year FHWA one-coat study was launched in November 2006 to evaluate various commercially available coating materials that can be applied as one-coat systems to new steel bridges. Seven one-coat systems, a 3-coat and a 2-coat control were selected and tested in three outdoor environments. After 24 months in marine environment and 18 months in natural weathering exposures in Virginia, the one-coat systems exhibited different degrees of deterioration. Except for urethane mastic, which developed eight medium size blisters and G5 grade rusting after exposed in the marine environment, most of the one-coat systems showed virtually no surface failures. The final mean rust creepage at the scribe ranged from around 2 mm for most of the one-coat systems to 30 mm for polysiloxane. When viewed collectively, none of the one-coat systems performed as well as the 3-coat control in the outdoor exposures.

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