METHOD OF PREPARING BITUMINOUS MATERIAL COMPOSITION Russian patent published in 2001 - IPC

FIELD: road-building materials. SUBSTANCE: invention relates to preparation of bituminous materials that can be used for manufacturing movement joint for highway bridges and aims at improving working properties of bituminous materials and prolonging their lifetime. For that aim, bituminous material composition is prepared preferably on the basis of petroleum bitumen, to which structuring and plasticizing components are added. In particular, plasticizing component, preferably oil-polymer tar, is first added to bitumen preheated to 150-200 C in amount of 8-20 wt %, after which structuring component, preferably butadiene-styrene rubber (10-25%), is added. Plasticizing component is dissolved in bitumen during 5-10 min, and structuring component during a period of time from 30 min to 2.5 h. Oilpolymer tar is preferably added in the form of granules and butadienestyrene in the form of granules or powder in 2-3 preferably equal portions. Utilized bitumen is either oxidized or compounded. EFFECT: reduced brittle temperature and increased heat resistance of bitumens. 5 cl, 2 tbl, 3 ex