Patent ID: 8133316
Filing Date: 2012-03-13
Classification: C08L,E01C,Y02A

Abstract:
1. A process for preparing an asphalt mixture from recycled asphalt pavement (RAP), virgin aggregate, filler and first and second binder materials, comprising steps of (a) transporting RAP through a first drum and thereby heating the RAP to a temperature of from 70 to 130° C.; (b) transporting virgin aggregate through a second drum, thereby heating the virgin aggregate to a temperature of from 90 to 130° C.; (c) adding a first binder material to the RAP in the first drum to provide treated RAP; and (d) supplying the treated RAP from the first drum to a mixing zone, supplying the virgin aggregate from the second drum to the mixing zone, supplying filler to the mixing zone, supplying a second binder material to the mixing zone, and mixing to provide the asphalt mixture; wherein the first binder material is a mineral oil or an oil of vegetable or animal origin, wherein the second binder material comprises a hard bitumen component having a penetration at 25° C. of less than 100 1/10mm (measured according to EN 1426 at 25° C.) and further comprises a soft bitumen component having a viscosity of less than 0.3 Pa·s at 100° C. (measured according to EN 13302 at 100° C.), and wherein the hard bitumen component is added as a bitumen emulsion or as a foamed bitumen.