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Bridge coatings have evolved significantly over the years, which has led to wide array of coating types for the bridge coatings community to choose from. This paper will briefly discuss the evolution of bridge coatings through time and will also discuss the most current systems deployed in the coating of structural steel bridges. The primary focus of this paper will be centered on one of the newer technologies available, polysiloxane.
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Organic modified polysiloxanes are generally recognized as the newest generic class of high-performance protective coating. They have gained commercial acceptance over the last ten years and are now widely used in new construction, heavy duty OEM, marine and industrial maintenance painting. This paper provides an overview of the technology, describes the available types of polysiloxane modified organic coatings and their properties and briefly discusses some recent advances in the field.
Coating technologies for bridges has not changed much since 1977. Available finish coat technologies were limited to alkyd, acrylic, or urethane-based chemistry. Performance of these chemistries has declined over the years due to cost reduction in paint to meet project pricing requirements. Bridge owners and engineers have had a limited selection of high-performance coatings to protect their assets. This is even more important with high profile structures where the finish coat needs to stand the test of time and limited maintenance funding has forced asset owners to extend time in between cosmetic maintenance