Standard Practice for
Evaluation of Protective Coating Systems for Structural Steel
AASHTO Designation: R 31-08
SCOPE
1.1.This specification covers testing criteria for evaluation of protective coating systems for use on iron and steel surfaces.
1.2.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.
1.3.The values stated in SI units are to be regarded as the standard.
1.4.This standard may involve hazardous materials, operations, and equipment.
It does not purport to address all safetyproblems associated with its use.
It is the responsibility of the user of this standard 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 has been developed around a three-coat system consisting of a zinc primer, epoxy or urethane intermediate, and an aliphatic urethane finish coat.
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