BITUMEN-MINERAL MIXTURE Russian patent published in 2001 - IPC

FIELD: fabrication of road-building materials such as mixtures of stone materials with anti-icing additive treated by organic binding agent (bitumen). SUBSTANCE: bitumen- mineral mixture used for rough-surface coverings on highways has road metal, manufactured sand, natural sand, or their mix, anti-icing additive, bitumen; used as anti-icing additive is mineral powder obtained by joint milling of carbonate rock (limestone) with 50-70 % from mass of mineral powder of alkali metal chlorides and/or alkali-earth metal chlorides, with 3-8% from mass of chlorides of water-soluble phosphates of alkali and/or alkali-earth metals (such as mono- or bisubstituted sodium phosphate or superphosphate), and with 2-3% from mass of bitumen mineral powder; proportion of mentioned chlorides is 3-7% from mass of bitumen-mineral mixture at water absorbing of the latter amounting 4-9% by volume. EFFECT: enhanced efficiency of anti-icing additive without reducing strength of bitumen-mineral covering and corrosive action on metal parts of vehicles. 3 cl, 2 tbl