Abstract: The present invention discloses an eco-friendly road surface material for thawing ice and snow and the methods of preparing and using the same. The preparation method includes the following steps: 1) adding 10-50 parts of snow thawing substances into 50-100 parts by weight of water, after dissolving the snow thawing substances completely, adding sodium hydroxide solution to adjust the pH value of the mixture to be 8-10, then adding 10-50 parts by weight of support material, and stirring, baking, milling and sieving the mixture to obtain a support powder loaded with snow thawing substances; 2) adding 15-40 parts by weight of the support powder loaded with snow thawing substances into 10-30 parts by weight of cation emulsified asphalt, then adding 10-30 parts by weight of aqueous epoxy resin, 10 to 50 parts by weight of water and the curing agent of aqueous epoxy resin to obtain the coating material for thawing ice and snow.

Abstract: The present invention provides a method and pavement structure for protecting highway subgrade in frozen soil areas. The pavement structure has two or more pavement layers having gradient thermal conductivity; the thermal conductivity is layered among the pavement layers and is lowered from top to bottom, so that the pavement forms a uni-directional thermal conducting tunnel from the subgrade to the air. Heat can be easily released from the subgrade into the air, and is prevented from being transferred from the air to the subgrade. In this way, the frozen soil layer beneath the subgrade is cooled, so that the frozen soil table is made stable, and the highway subgrade in frozen soil areas is protected.