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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%.
Freeze drying of the product was carried out at â20Â° C, with a controlled pressure in the chamber in the range of 0.4 torr, and a shelf temperature of 30Â° C. When the injection of non-condensable gas was terminated, the product cooled rapidly, and the vapor removal rate slowed.