Asphalt Rubber Technology Information Center
Evaluation of Coatings on Coastal Steel Bridges, 16-year Period
Document available through TRB
Rooney, Herbert A.; Woods, Albert L. and Shelly, Thomas L.  
December, 1970  
Key Words:

The California Division of Highways investigated a wide spectrum of coatings for the protection of steel from corrosion in
an aggressive marine environment for 16 years in the period 1952-1968.  Evaluation of test sections of two bridges to
which the coatings were applied showed that the best system after a 10-year exposure was an inorganic post-cure
zinc-pigmented sodium silicate primer having a vinyl finish coat.  This system was rated 9+, with 10 being perfect.  
Evaluation of the inorganic self-cure zinc-pigmented silicate primers will not be available for another 6 to 10 years.  All
other systems provided definitely inferior protection, the next best being an all-vinyl type.
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