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ENVIRONMENTAL TESTING OF BITUMINOUS COATINGS

THE PURPOSES OF ENVIRONMENTAL TESTING ARE BRIEFLY REVIEWED. THIS STUDY EXPLORES THE USE OF ENVIRONMENTAL TESTING FOR SELECTION OF A COATING FOR A SPECIFIC NEED. MOST OF THE PROCEDURES AVAILABLE FOR LABORATORY EVALUATION OF COATINGS UTILIZE ARTIFICIAL SOURCES OF RADIATION TO SIMULATE SUNLIGHT, AND FOG CHAMBER DEVICES. THE ARTIFICIAL WEATHERING METHODS PROVIDE NO RELIABLE MEANS OF EQUATING THE TIME OF ARTIFICIAL EXPOSURE TO THE CORRESPONDING TIME OF NATURAL EXPOSURE INVOLVING FAILURE OF THE COATING. THE SHORT-TERM ENVIRONMENTAL TEST, IMMERSING THE TEST COUPON IN WATER, COULD GIVE A ROUGH IDEA OF INITIAL COATING CONDITION, BUT A TWENTY -FOUR HOUR TEST SEEMS OF LITTLE VALUE OTHER THAN TO ELIMINATE OBVIOUS UNSUITABLE COATINGS. EXPOSURE TO A NATURAL ENVIRONMENT IS THE BEST METHOD OF ENVIRONMENTAL TESTING OF COATINGS FOR ATMOSPHERIC EXPOSURE. HOWEVER, EXCESSIVE TIME IS REQUIRED FOR FULL EVALUATION. UNDERGROUND AND UNDERWATER ENVIRONMENTS IMPOSE A NECESSITY FOR GREATER PHYSICAL STRENGTH AND HIGHER ELECTRICAL RESISTANCE, USUALLY REQUIRING MUCH LONGER USEFUL LIVES THAN THOSE OF COATINGS INTENDED FOR EXPOSURE TO THE ATMOSPHERE. LABORATORY TESTS ARE REVIEWED FOR EVALUATING COATINGS IN SUBMERGED SERVICE. THESE TESTS INCLUDE: FRESH WATER IMMERSION, SALT-SPRAY BOX, OUTDOOR WEATHERING, AND WEATHEROMETER. USE OF A SOIL BOX IS DESCRIBED FOR NATURAL ENVIRONMENT SOIL TESTS. PROBABLY THE LARGEST NATURAL ENVIRONMENT TEST PROGRAM FOR PROTECTIVE COATINGS WAS CONDUCTED BY THE AMERICAN PETROLEUM INSTITUTE. THESE TESTS UTILIZED 16 TEST SITES AND INVOLVED DIFFERENT COATING SYSTEMS APPLIED TO 3-INCH PIPE AT EACH OF THE SITES.

  • Supplemental Notes:
    • Vol 58, No 6, PP 55-58, 3 FIG, 9 REF
  • Authors:
    • Meany, J J
  • Publication Date: 1966-6

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Filing Info

  • Accession Number: 00211533
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 26 1970 12:00AM