EFFECT OF SALT ADDITIVES ON CONCRETE DEGRADATION (PHASE II). EXECUTIVE SUMMARY

This research builds on a previous investigation, which found that corrosion-inhibitor-added deicing salts caused degradation of concrete by both anions and cations. The latest research phase looked at methods to detect the chemical reactions between concrete and corrosion-inhibitor-added deicing salts, and to determine the chemical compositions of the precipitates formed by chemical reactions between concrete and the corrosion-inhibitor-added deicing salts. The research led to the following conclusions: a simple method was developed for the detection of chemical reactions between deicing chemicals and concrete; the results provided clear evidence of the chemical reactions between concrete and the corrosion-inhibitor-added deicing salts; the different amounts of precipitates (chemical reaction products) found in the test cells were dependent on the type and concentration of corrosion-inhibitor-added deicing salts; precipitates formed by chemical reactions between deicing chemicals and concrete were identified by using chemical analysis, scanning electron microscopy, and X-ray diffraction analysis; and precipitates were calcium and/or magnesium phosphates as a major component, and gypsum as a minor component.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00725559
  • Record Type: Publication
  • Report/Paper Numbers: MN/RC-96/10
  • Contract Numbers: 71262 TOC #120
  • Files: NTL, TRIS, STATEDOT
  • Created Date: Sep 12 1996 12:00AM