METHOD FOR PRODUCING COLD ASPHALT-CONCRETE MIXTURE FROM SCREENINGS OF GRANITE GRAVEL CRUSHING Russian patent published in 2017 - IPC C04B26/26 C04B111/20 C04B111/27 

FIELD: construction.

SUBSTANCE: in method for producing cold asphalt mixture from the screenings of granite gravel crushing, which includes applying asphalt-binder coatings made of mineral powder and modified bitumen to the heated gravel particles by pelletizing; before granulation, the screenings of granite gravel crushing are divided into two fractions with the particle sizes of 2-5 mm and the fraction with finer particles, with the subsequent granulating of the 2-5 mm fraction particles by applying asphalt-binder coatings containing the following percentages by weight of said fraction: mineral powder - 15-20, bitumen BND 60/90, modified by 15% by bitumen weight with spent engine oil - 2-3; cooling the obtained granules, mixing them with the particles of a finer fraction at a ratio 3:1 of mass fractions with further stirring the mixture obtained in the cold state with adding 2% by weight of bitumen emulsion mixture.

EFFECT: increasing strength and durability, preventing shrinkage, increasing the shelf life of the material without loss of performance properties, reducing the tendency to caking.

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