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.
-
- Record URL:
-
Corporate Authors:
University of Minnesota, Minneapolis
Department of Geology and Geophysics, 310 Pillsbury Drive, SE
Minneapolis, MN United States 55455Minnesota Department of Transportation
395 John Ireland Boulevard
St Paul, MN United States 55155 -
Authors:
- Jang, J-W
- Iwasaki, I
- Weiblen, P
- Publication Date: 1995-2
Language
- English
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: 20 p.
Subject/Index Terms
- TRT Terms: Calcium; Chemical composition; Chemical reactions; Concrete; Deicing chemicals; Detection and identification; Detectors; Deterioration; Gypsum; Inorganic phosphates; Magnesium compounds; Phosphates; Precipitation (Chemistry)
- Uncontrolled Terms: Degradation; Deteriorated concrete
- Old TRIS Terms: Calcium phosphates; Magnesium phosphates; Precipitates
- Subject Areas: Highways; Materials; I32: Concrete;
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