PROTECTIVE COATINGS TO PREVENT DETERIORATION OF CONCRETE BY DEICING CHEMICALS

RESULTS ARE PRESENTED OF A LABORATORY INVESTIGATION TO DETERMINE WHICH OF THE POTENTIAL PROTECTIVE COATINGS ARE MOST EFFECTIVE AND ECONOMICAL TO PREVENT THE DETERIORATION OF CONCRETE BRIDGE DECKS AND STRUCTURES RESULTING FROM SCALING CAUSED BY THE INCREASING USE OF DEICING CHEMICALS. A TOTAL OF 110 COATINGS WAS EVALUATED IN THE PROGRAM, INCLUDING LINSEED OIL SOLUTIONS AND EMULSIONS, SOLUTIONS OF OTHER VEGETABLE OILS, EPOXY AND MODIFIED EPOXY COATINGS, A NUMBER OF OTHER SYNTHETIC RESIN COATINGS, RUBBER COATINGS, TARS, ASPHALT, WAXES, OILS, AND VARIOUS INORGANIC COATINGS AND TREATMENTS. LABORATORY FREEZE-THAW EXPERIMENTS WERE PERFORMED TO EVALUATE THE DEGREE OF RESISTANCE OF THE COATINGS TO THE ATTACKING FORCES RESULTING FROM CONTINUED EXPOSURE TO A 3 PERCENT SOLUTION OF SODIUM CHLORIDE BRINE. GOOD PROTECTION OF NON-AIR-ENTRAINED CONCRETE WAS OBTAINED WITH COATINGS BASED ON LINSEED OIL OR OTHER VEGETABLE OILS AND A SAND-FILLED COAL TAR EPOXY COATING. THE MAJORITY OF THE ORGANIC COATINGS FAILED RAPIDLY BY FLAKING OR PEELING FROM THE SURFACE OF THE CONCRETE. MOST OF THE INORGANIC COATINGS AND SOME OF THE ORGANIC WERE APPRECIABLY PERMEABLE TO THE SALT SOLUTION AND AFFORDED PROTECTION ONLY FOR A SHORT TIME. CONSIDERING BOTH ECONOMY AND PERFORMANCE, THE BEST RESULTS WERE OBTAINED WITH VEGETABLE OILS AND, PARTICULARLY, LINSEED OIL SOLUTIONS. ATTENTION WAS GIVEN TO DETERMINING THE OPTIMUM COMPOSITION, APPLICATION CONDITIONS, AND APPLICATION RATES FOR LINSEED OIL SOLUTIONS. THE RESULTS SHOWED THAT THE 50-50 MIXTURE OF BOILED LINSEED OIL AND MINERAL SPIRITS NOW USED BY A NUMBER OF STATE HIGHWAY DEPARTMENTS WAS ABOUT THE OPTIMUM COMPOSITION AND THAT THE NORMALLY USED APPLICATION RATES WERE SATISFACTORY.

Media Info

  • Serial:
    • NCHRP Report
    • Issue Number: 16
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 00215799
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 7 1994 12:00AM