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Salt & gradation:  Material gradations have ranged from coarse to fine particle sizes. In de-icing the objective is to get the salt particle to move rapidly through the ice or snow layer to the pavement surface. A larger particle will have greater weight and therefore greater success in penetrating this layer. Because it is recommended that an anti-icing application be made on pavement with a minimal amount of frozen precipitation, the weight of the particles, and thus the coarse gradation, may not be an advantage. Fine particles have more surface area for an equivalent load weight and will go into solution faster. Their use will decrease the time for a solution to form and cover the entire road surface, and if the road is clear or well plowed prior to application, they may be more effective.




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