A modified water spray endurance test (WSET) was adapted from SAE Standard AS5901B and used to study the anti-icing endurance of a variety of sodium chloride–based highway anti-icer liquids. Freezing precipitation immediately forms rime ice on surfaces with no anti-icer treatment. On surfaces treated with anti-icer, freezing precipitation goes through a series of stages and initially forms a liquid brine layer, then nonadherent glaze ice, and finally rime ice. The modified WSET was used to study the effect of a variety of additives in sodium chloride anti-icing liquids. High-molecular-weight organic polymer additives were found to strongly inhibit the onset of rime ice formation. The delay in the onset of rime ice formation caused by anti-icers is postulated to be the result of an enhancement of surface melting, increasing the size of the quasiliquid layer at the ice surface and favoring glaze rather than rime ice formation until the anti-icer has been sufficiently diluted. The same surface melting enhancement caused by anti-icer chemicals may also contribute to the observed effectiveness of low concentrations of anti-icer in preventing ice adhesion to pavement surfaces. In this context, the use of the modified WSET to evaluate rime ice growth rates is discussed as a possible way to compare the relative precipitation resistance (and therefore “effective lifetime”) of different anti-icer formulas.
Water Spray Endurance Test Investigation
Evaluation of Highway Anti-Icer Performance Under Freezing Precipitation
Transportation Research Record
2013-01-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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