Performance of Protective Coatings on Structural Plate Pipe Arches

About the report:

The performance of bituminous coatings on structural plate pipe and pipe arches was evaluated in a limited field study supplemented by a survey of information from other agencies. Of the two available application techniques, immersion of individual plate elements in hot asphalt and spraying of a cold asphalt mastic on completed pipe sections, it appears that the latter provides a more adherent and more consistently satisfactory coating. It is recommended that the use of asphalt mastic sprayed on the assembled structures be specified, whenever possible, in preference to coating by hot immersion. The application of asphalt mastic to large sections of pipe assembled at the plant and shipped to the construction site should be explored. Elimination of the coating requirement is not recommended at this time, but it is suggested that data on the real cost of the coatings be collected by the operating divisions and that the progress of broader studies of the performance of coatings proposed or under way in other agencies be followed.

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