ADDITIVE FOR BROKEN STONE-MASTIC BITUMINOUS CONCRETE Russian patent published in 2004 - IPC

FIELD: manufacture of road-building materials. SUBSTANCE: invention relates to employment of polymer-bitumen additives for application in manufacture of h high-way pavements based on broken stone-mastic bituminous concretes. Additive comprises binding agent, rubber crumb, mineral oil, polymer, and additionally cellulose fibers and aluminosilicate as structuring agent, said binding agent being bitumen emulsion and said polymer polyacrylamide. Amounts of components utilized are following: cellulose fibers 40-60, rubber crumb 15-20, aluminosilicate 10-15, oil 3-5, polyacrylamide 3-5, and bitumen emulsion - the balance. Additive may preferably contain 0.5-1.0% of ionic surfactants. EFFECT: lowered brittleness temperature and raised melting temperature of additive in easy-to-use granulated form, and reduced manufacturing expenses. 2 cl, 2 tbl