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
The research led to the following conclusions:
* a simple method was developed for the detection of chemical reactions between deicing chemicals and
* the results provided clear evidence of the chemical reactions between concrete and the corrosion-inhibitoradded
* 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
Jang, Ji-Won; Iwasaki, Iwao; Weiblen, Paul.
Effect of salt additives on concrete degradation (phase II): executive summary.
Minnesota Department of Transportation.
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