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 bin
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.
대표청구항▼
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
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. 2. A process according to claim 1, wherein some or all of the RAP is derived from porous asphalt. 3. A process according to claim 1, wherein the asphalt mixture is a porous asphalt mixture. 4. A process according to claim 1, wherein the hard bitumen component is added as a foamed bitumen. 5. A process according to claim 1, wherein in step (d) the treated RAP and the virgin aggregate are added to the mixing zone prior to addition of the filler and the second binder material. 6. 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. 7. A process according to claim 6, further comprising: 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. 8. A process according to claim 7, wherein the second binder material 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.). 9. A process according to claim 7, wherein treated RAP is retained in the first storage vessel for a period of from 5 to 60 minutes. 10. A process according to claim 7, wherein some or all of the RAP is derived from porous asphalt. 11. A process according to claim 7, wherein the asphalt mixture is a porous asphalt mixture. 12. A process according to claim 7, wherein the hard bitumen component is added as a foamed bitumen. 13. A process according to claim 7, wherein the treated RAP and the virgin aggregate are added to the mixing zone prior to addition of the filler and the second binder material. 14. A process according to claim 12, further comprising: supplying the treated RAP from the first storage vessel to a mixing zone, supplying the virgin aggregate from the second storage vessel 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. 15. A process according to claim 14, wherein the second binder material further comprises a soft bitumen component having a viscosity of less than 0.3Pa·s at 100° C. (measured according to EN 13302 at 100° C.). 16. A process according to claim 14, wherein treated RAP is retained in the first storage vessel for a period of from 5 to 60 minutes. 17. A process according to claim 14, wherein some or all of the RAP is derived from porous asphalt. 18. A process according to claim 14, wherein the asphalt mixture is a porous asphaltmixture. 19. A process according to claim 14, wherein the hard bitumen component is added as a foamed bitumen. 20. A process according to claim 14, wherein the treated RAP and the virgin aggregate are added to the mixing zone prior to addition of the filler and the second binder material. 21. 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. 22. A process according to claim 21, wherein treated RAP is retained in the first storage vessel for a period of from 5 to 60 minutes. 23. A process according to claim 21, wherein some or all of the RAP is derived from porous asphalt. 24. A process according to claim 21, wherein the asphalt mixture is a porous asphalt mixture. 25. A process according to claim 21, wherein the hard bitumen component is added as a foamed bitumen. 26. A process according to claim 21, wherein in the treated RAP and the virgin aggregate are added to the mixing zone prior to addition of the filler and the second binder material. 27. A process according to claim 26, further comprising: supplying the treated RAP from the first storage vessel to a mixing zone, supplying the virgin aggregate from the second storage vessel 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. 28. A process according to claim 27, wherein treated RAP is retained in the first storage vessel for a period of from 5 to 60 minutes. 29. A process according to claim 27, wherein some or all of the RAP is derived from porous asphalt. 30. A process according to claim 27, wherein the asphalt mixture is a porous asphalt mixture. 31. A process according to claim 27, wherein the hard bitumen component is added as a foamed bitumen. 32. A process according to claim 27, wherein the treated RAP and the virgin aggregate are added to the mixing zone prior to addition of the filler and the second binder material.
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