United States Department of Transportation
i
Evaluation and analysis of liquid deicers for winter maintenance : final report.
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2017-09-01
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[PDF-32.70 MB]
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Abstract:The Ohio Department of Transportation (ODOT) uses mechanical and chemical methods to keep the roads safe during snow and ice events. Chemical solutions are available on the market to assist ODOT in preventing snow from bonding to the road surface as well as melting snow that is already bonded when NaCl rock salt or brine solution are no longer affective due to low temperatures. This project reviewed the performance of eight liquid deicers in the field and lab. The field research began with testing on a closed site, with no traffic volume. These tests showed in order to breakup and clean hard-packed snow, mixing is needed to occur by traffic. Therefore, there was a change in the test methodology to allow for simulated traffic volume on the closed site. The following two winter seasons consisted of testing on low volume roads in Chardon Township and a medium volume road in Boston Heights. The road surface friction and surface temperatures were monitored. Additional testing occurred in the lab. Lab testing of freezing points, ice melting capacity, and ice penetration for each deicer may assist in the performance of these deicers at lower temperatures. The deicer recommendations for temperatures warmer than 21ºF are based on field data while recommendations for 0ºF to 21ºF are based on the lab data. When temperatures are warmer than 21ºF the study suggests using brine. When the temperature is between 15ºF and 21ºF, a solution of 30% deicer G and 70% brine is the most economical recommendation. When the temperatures are between 0ºF and 15ºF, deicer G Thermapoint 793 with no brine added, is the least expensive deicer that will work according to the lab test results.
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