The purpose was to find a more economical and time saving method for coating a steel bridge. This was accomplished by evaluating the cost and accelerated life of an organic zinc primer together with its appropriate topcoat versus the cost and life of the presently used Basic Lead Silico Chromate coating. Five generic types with their respective topcoats were studied and an approved qualified products list for each system was made based on the results of accelerated exposures (salt fog and weatherometer tests).
Although Louisiana has been testing and using organic zinc coatings since 1963, premature failures have occurred on bridges within the state recently....
All steel bridge systems need some type of a corrosion protection scheme to ensure a serviceable life. The most common approach is to use a multilayer...
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