ASPHALTIC CONCRETE MIX Russian patent published in 2003 - IPC

FIELD: manufacture of road-building materials. SUBSTANCE: road-building destined asphaltic concrete mix contains, wt.%: broken limestone fraction 5-20 mm, 35-45; mineral powder, especially carry-over ashes from heat power electrofilters, 3-8; viscous petroleum bitumen, 5-6; polymer additive, especially polyvinylpyrrolidone synthesis vat residue (25% alpha- pyrrolidone, 2-3% vinylpyrrolidone, and vinylpyrrolidone and amidobutyric acid - the rest), 0.5-1.75; and sand fraction up to 5 mm - the balance. Material may be used for upper pavement layers in all climatic zones. EFFECT: improved physicochemical characteristics of mix, reduced expensive components' usage, and lowered environmental damage. 6 tbl