Tire–Pavement Interaction in Contact with Salted Snow: How an Aqueous Solution Affects Compression, Squeeze-Out, and Compaction of Snow

Influence of NaCl Aqueous Solution on Compacted Snow: Field Investigation

“…However, based on the results presented here, it also appears possible to extend our anticompaction considerations above 0°C; SC= 5 wt.% allows easier mechanical removal of compacted snow, and SC= 10 wt.% makes snow loose enough to be removed by the car traffic, including air temperatures above zero. While previous studies (Giudici et al, 2017) have implied this finding for temperatures below zero, this is, to the best of our knowledge, the first time a minimum solution content has been found for anti-compaction at melting temperatures.…”

“…When the air temperature dips below 0°C; for example, if the amount of SC required after 2 hours is known, it is possible to calculate the amount of solid NaCl as a function of the temperature and mm of water equivalency. For instance, if we consider an expected snowfall of 5 cm over a 2 -hour period of time with a temperature of -2°C, and we propose using use NaCl as salt, similar calculations from (Giudici et al, 2017) suggest an application rate of approximately 10 [g] for road square meters in order to achieve the partial (or full) asperities visibility during snowfalls. This application rate falls within the Norwegian Public Road Administration's suggested range, 5 -20…”

“…Nevertheless, various parameters, such as air and asphalt temperature, chemical snow mixture density, traffic load, type of tire with relative inflation pressure, were not considered in (Schaerer, 1970)'s investigation, making it difficult to interpret his results. Through their laboratory experiments (Giudici et al, 2017) suggest that the solution content can be substantially lowered (to about 10 wt.%) and still provide satisfactory anticompaction effect; however, this assertion needs to be tested through field studies using different temperatures for verification under realistic conditions.…”