Process for preparing an asphalt mixture
AssigneeShell Oil Company
InventorsKarel Poncelet, Gerrit Gijsbertus Van Bochove
Life of this patent
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Abstract
A process for preparing an asphalt mixture from recycled asphalt pavement (RAP), virgin aggregate, filler and first and second binder materials, is disclosed. The process comprises steps of transporting RAP through a first drum; transporting virgin aggregate through a second drum; adding a first binder material to the RAP in the first drum to provide treated RAP; supplying the treated RAP, the virgin aggregate, filler and a second binder material to a mixing zone; and mixing to provide the asphalt mixture.
Claims32
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.
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 soft bitumen component having a viscosity of less than 0.3 Pa·s at 100° C. (measured according to EN 13302 at 100° C., 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 wherein the hard bitumen component is added as a bitumen emulsion or as a foamed bitumen.
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;
- (d) supplying the treated RAP from the first drum to a first storage vessel;
- and
- (e) supplying the treated RAP from the first storage vessel 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.
Dependencies are inferred from the claim text.