TECHNIQUES FOR RETARDING THE PENETRATION OF DEICERS INTO CEMENT PASTE AND MORTAR

SEVERAL TECHNIQUES WERE TRIED FOR LIMITING THE PENETRATION OF DEICING SALTS INTO CONCRETE AND THEREBY PREVENTING THE CORROSION OF REINFORCING STEEL IN CONCRETE BRIDGE DECKS CAUSED BY THE PRESENCE OF CHLORIDES. FACTORS AFFECTING THE PENETRATION OF DEICING SLATS WERE STUDIED WITH HYDRATED CEMENT PASTES AND MORTARS AS THE PENETRATION MEDIUM. SALTS TESTED WERE; IN INCREASING ORDER OF DEGREE OF PENETRATION; AMMONIUM FLUORIDE, SODIUM CHROMATE, CALCIUM CHLORIDE, SODIUM CHLORIDE, AMMONIUM CHLORIDE, AND ALUMINUM CHLORIDE. THE MOST EFFECTIVE RETARDATION TECHNIQUE WAS IMPREGNATION WITH METHYL METHACRYLATE MONOMER AND SUBSEQUENT PLYMERIZATION BY IRRADIATION. POLYMER IMPREGNATION SUCCEEDED IN DECREASING SUBSEQUENT DEEP-SEATED PENETRATION BY A FACTOR OF 50 AND SURFACE PENETRATION BY A FACTOR OF 5. AMMONIUM FLUORIDE AND SODIUM CHROMATE WERE RELATIVELY NONPENETRATING AND THEREFORE MAY BE SUITABLE AS DEICERS, ALTHOUGH ENVIRONMENTAL FACTORS MIGHT DISCOURAGE THE USE OF FLUROIDE AND POSSIBLY THE CHROMATE AS WELL. AN ANION-EXCHANGE RESIN WAS FOUND TO BE PARTIALLY EFFECTIVE IN DECREASING THE AVAILABLE CHLORIDE CONTENT IN CEMENT PASTE, PROVIDED THE WATER-CEMENT RATIO COULD BE KEPT LOW. PART OF THE INVESTIGATION ALSO INCLUDED EFFORTS TO DEVELOP MEANS FOR REDUCING DANGEROUS CHLORIDE LEVELS ALREADY EXISTENT IN CONCRETE. A BACK-FLUSHING TECHNIQUE WAS EFFECTIVE IN REVERSING CHLORIDE PENETRATION TO A LIMITED EXTENT AND EFFORTS IN THIS DIRECTION ARE BEING CONTINUED. IMPREGNATION OF CEMENT PASTE BY MATERIALS OTHER THAN METHACRYLATE, SUCH AS SULFUR; BARIUM HYDROXIDE, AND AMMONIUM FLUORIDE, IS BEING INVESTIGATED.

  • Corporate Authors:

    Federal Highway Administration

    Office of Research and Development, 1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Berman, H A
    • Chaiken, B
  • Publication Date: 1972-12

Media Info

  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00208107
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-72- 46 Intrm Rpt., FCP 24B1-032
  • Files: TRIS, USDOT
  • Created Date: May 15 1976 12:00AM