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AASHTO R 31

2009 Edition, January 1, 2009

Complete Document

Standard Practice for Evaluation of Protective Coating Systems for Structural Steel

Includes all amendments and changes through Reapproval Notice , 2014


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Description / Abstract:

This standard practice covers testing criteria for evaluation of protective coating systems for use on iron and steel surfaces. It is not recommended for the evaluation of hot-dip galvanizing or metalizing.

The protective coating systems are intended for use on bridges, similar structural steel, and other ferrous metal surfaces, both new and existing, prepared by abrasive blast cleaning, which are subject to corrosive atmospheric environments, such as marine, industrial, deicing chemicals, and high humidity.

The values stated in SI units are to be regarded as the standard.

This standard practice may involve hazardous materials, operations, and equipment. It does not purport to address all safety problems associated with its use. It is the responsibility of the user of this standard practice to establish the appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Note 1—The testing format for this standard practice has been developed around a three-coat system consisting of a zinc primer, epoxy or urethane intermediate, and an aliphatic urethane finish coat.