EVALUATION OF UNITED SALT'S CORROSION INHIBITOR INTENDED FOR USE WITH SODIUM CHLORIDE DEICING SALT

This study documents the performance of United Salt's corrosion inhibitor mixed with sodium chloride (NaCl) deicing salt in the following areas: 1) Subjective performance as a deicing agent (as viewed by maintenance personnel using the material); 2) Effect on the rate of corrosion of reinforcing steel specimens placed in a concrete pavement in a real highway environment; and 3) Effect on the scaling rate of concrete specimens (both air-entrained and non-air-entrained) exposed to controlled freeze-thaw cycles in a laboratory environment. Several different ratios of inhibitor to NaCl were tested and compared to NaCl alone and calcium magnesium acetate (CMA) alone as well as several ratios of CMA to NaCl. Inhibitor-treated salt appeared to function about as well as regular deicing salt as a deicer but resulted in more frequent plugging of application equipment, at least for the first shipment of inhibitor which had a much smaller particle size than material supplied later. The larger material still tended to plug the equipment slightly more frequently than regular deicing salt. Overall, the reinforcing steel specimens which were exposed to the corrosion inhibitor-treated salt experienced slightly more weight loss (on average) due to corrosion than the specimens that were not. Differences are not statistically significant, however, for the specimens subjected to just one winter (four months exposure). For specimens exposed to two winters (16 months exposure with just plain salt being used during the second winter on both the experimental and control sections of pavement) the differences were statistically significant. The concrete freeze-thaw specimens exposed to the corrosion inhibitor had as much or more weight loss due to scaling than those exposed to pure NaCl, for both the air-entrained and non-air-entrained samples. Freeze-thaw specimens exposed to several CMA/NaCl ratios experienced less freeze-thaw damage than those exposed to the corrosion inhibitor. Less freeze-thaw damage occurred as the concentration of CMA increased. Almost no freeze-thaw damage was experienced by the specimens exposed to CMA alone.

  • Corporate Authors:

    Michigan Department of Transportation

    State Transportation Building, 425 West Ottawa Street, P.O. Box 30050
    Lansing, MI  United States  48909
  • Authors:
    • McCrum, R L
    • Heffernan, J V
  • Publication Date: 1991-8

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00625553
  • Record Type: Publication
  • Report/Paper Numbers: Res Proj 89 G-271, Res Rept No. R-1313
  • Files: TRIS, STATEDOT
  • Created Date: Dec 18 1993 12:00AM