METHOD TO PREPARE ASPHALT-CONCRETE MIXTURE Russian patent published in 2014 - IPC C04B26/26 C04B40/00 C04B111/27 

FIELD: construction.

SUBSTANCE: in the method to prepare an asphalt-concrete mix by means of mixing of heated mineral components, bitumen and an additive with usage of oil sludge, the additive is a finely dispersed powder, produced intense mixing of a working agent with oil sludge at their ratio of 1.5:1 with addition of water for full lime slaking, treatment of produced product with carbonic acid gas for 10-15 minutes and soaking under tight conditions for 18-30 hr, where the working agent is produced by mixing, wt %: animal fat 1-3, adsorbent produced by pyrolysis of worn car tyres at 850-1100°C with subsequent separation of metal cord and grinding to 10^-3÷10^-5 m, 18-22, burnt lime ground to 10^-3÷10^-5 m, balance, with content of bitumen of 66-83% of the mass of the specified additive, mineral components are heated to 70-90°C, the mixture of bitumen with the specified additive - up to 90-100°C, and mixing of all these mixture components is carried out during heating of up to 140-170°C.

EFFECT: improved parameters of an asphalt-concrete mixture by water resistance and water saturation.

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