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Test results indicate that salt has a significant effect on the low temperature performance of asphalt binders; Freezeâthaw is a main influencing factor when the percentage of salt is less than 3%, and the erosion effect of salt accelerates the failure of asphalt mixtures when the percentage of salt is more than 3%.
Freezing and Thawing Indexes. Depth of freezing and thawing depends in part on the magnitude and duration of the temperature differential below or above freezing (32 Â°F) at the ground surface. The freezing or thawing index is therefore given by the summation of the degree-days for a freezing or thawing season.