초록 ▼

A method for recycling in place an asphalt mixture layer of a paved road continuously, while moving a self-propelled vehicle system, which comprises a step of heating and softening the asphalt mixture layer, a step of scraping and breaking said hot and softened asphalt mixture layer and keeping the

A method for recycling in place an asphalt mixture layer of a paved road continuously, while moving a self-propelled vehicle system, which comprises a step of heating and softening the asphalt mixture layer, a step of scraping and breaking said hot and softened asphalt mixture layer and keeping the softened mixture at a temperature sufficient not to form an aggregate, to prepare an asphalt mixture having a single-grained structure, a sieving step of classifying said asphalt mixture having a single-grained structure into a plurality of grain size groups, a step of designing mix proportions for converting said asphalt mixture to a recycled asphalt mixture by the use of said plurality of grain size groups classified, a step of mixing uniformly said recycled asphalt mixtures having designed mix proportions, and a step of spreading and compacting said recycled asphalt mixtures having been mixed uniformly, to thereby form a recycled asphalt mixtures layer.

대표청구항 ▼

What is claimed is: 1. A method for continuous on-site recycling of an asphalt mixture layer of a pavement with a motor-driven vehicle system moving along a road surface, the asphalt mixture layer comprising asphalt and individual particles of aggregates of different particle sizes, the asphalt ser

What is claimed is: 1. A method for continuous on-site recycling of an asphalt mixture layer of a pavement with a motor-driven vehicle system moving along a road surface, the asphalt mixture layer comprising asphalt and individual particles of aggregates of different particle sizes, the asphalt serving as a binder for the individual particles of aggregates, wherein the method comprises the steps of: a) applying heat to the asphalt mixture layer to soften the asphalt in the asphalt mixture layer; b) scarifying and loosening the softened asphalt mixture layer to substantially retrieve therefrom the individual particles of aggregates of different particle sizes under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt; c) screening the loosened individual particles of aggregates, under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt, to provide a plurality of groups of particles of aggregates separated from each other based on particle size; d) selecting groups from among said plurality of groups, and blending the individual particles of aggregates from the selected groups in accordance with a specified mix ratio, under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt, to provide a regenerated asphalt mixture appropriate for use in pavement; and e) spreading and compacting the regenerated asphalt mixture over the road surface on which said steps a) and b) have been carried out to provide a renewed asphalt mixture layer on the road surface. 2. The method as defined in claim 1,wherein at least one of step b) and d) comprises a step of adding a rejuvenating agent. 3. The method as defined in claim 1,wherein said step d) comprises a step of storing one or more unused groups from among said plurality of groups of particles of aggregates of different particle sizes, and then discharging the one or more unused groups of particles out of the motor-driven vehicle system. 4. The method as defined in claim 1, wherein said step d) comprises a step of adding fresh asphalt mixture (new materials) to the blended and regenerated asphalt mixture. 5. The method as defined in claim 4,wherein said adding step comprises a step of adding a further fresh asphalt as modifying agent to the regenerated asphalt mixture to which the fresh asphalt mixture (new materials) has been added. 6. The method as defined in claim 1,wherein said step e) comprises a step of spreading and compacting the regenerated asphalt mixture to provide a two-layer construction having a base layer and a surface layer, wherein at least the base layer of the two-layer construction is a water impermeable, renewed asphalt mixture layer. 7. A method for continuous on-site recycling of an asphalt mixture layer of a pavement with a motor-driven vehicle system moving along a road surface, the asphalt mixture layer comprising asphalt and individual particles of aggregates of different particle sizes, the asphalt serving as a binder for the individual particles of aggregates, wherein the method comprises the steps of: a) applying heat to the asphalt mixture layer to soften the asphalt in the asphalt mixture layer; b) scarifying and loosening the softened asphalt mixture layer to substantially retrieve therefrom the individual particles of aggregates of different particle sizes under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt; c) screening the loosened individual particles of aggregates, under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt, to provide a plurality of groups of particles of aggregates separated from each other based on particle size; d) selecting groups from among said plurality of groups, and blending the individual particles of aggregates from the selected groups in accordance with a specified mix ratio, under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt, to provide a regenerated asphalt mixture appropriate for use in pavement; e) mixing uniformly, under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of aggregates through solidification of the softened asphalt, the regenerated asphalt mixture; f) wherein said step of mixing uniformly comprises the steps of: (i) mixing uniformly a part of the blended and regenerated asphalt mixture to provide a first regenerated asphalt mixture for forming a renewed and dense graded, water impermeable asphalt mixture layer; (ii) mixing uniformly all or a part of the remainder of the blended and regenerated asphalt mixture to provide a second regenerated asphalt mixture for forming a renewed and open graded, water permeable asphalt mixture layer; g) spreading and compacting the first regenerated asphalt mixture over the road surface on which said steps a) and b) have been carried out to provide a renewed and dense graded, water impermeable asphalt mixture layer; and h) spreading and compacting the second regenerated asphalt mixture over the road surface on which said step g) has been carried out to provide a renewed and open graded, water permeable asphalt mixture layer on the renewed, water impermeable asphalt mixture layer. 8. The method as defined in claim 7, wherein at least one of steps b) and d) comprises a step of adding a rejuvenating agent. 9. The method as defined in claim 7, wherein said step c) comprises a step of screening the loosened individual particles of aggregates to provide two groups comprising fine aggregates and coarse aggregates, or three groups comprising fine aggregates, medium aggregates and coarse aggregates in accordance with particle sizes. 10. The method as defined in claim 7, wherein said step d) further includes a step of storing one or more unused groups from among said plurality of groups of particles of aggregates of different particle sizes, and then discharging said unused groups of particles out of the motor-driven vehicle system. 11. The method as defined in claim 7, wherein said step d) further includes a step of adding fresh asphalt mixture (new materials) to the regenerated asphalt mixture. 12. The method as defined in claim 11, wherein said step of adding further includes a step of adding fresh asphalt as modifying agent to the regenerated asphalt mixture to which the fresh asphalt mixture (new materials) has been added. 13. A motor-driven vehicle system including at least a pre-heater vehicle, a miller vehicle, a blender vehicle and a mixer vehicle for continuous on-site recycling of an asphalt mixture layer of a pavement with the motor-driven vehicle system moved along a road surface, said asphalt mixture layer including asphalt and individual particles of aggregates of different particle sizes, wherein the asphalt serves as a binder for the individual particles of aggregates, wherein: a) said pre-heater vehicle having a device adapted to be disposed against the road surface for applying heat to the asphalt mixture layer to have the asphalt in the asphalt mixture layer softened; b) said miller vehicle having a device for scarifying and loosening materials of thus softened asphalt mixture layer to substantially retrieve therefrom the individual particles of aggregates of different particle sizes under a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles through solidification of the asphalt; c) said blender vehicle being provided with a device located at front thereof for scooping and transporting the scarified and loosened asphalt mixture, and a blending device located adjacent to said scooping and transporting device, said blending device including a screening device for screening the scooped and transported loosened individual particles to provide a plurality of groups of particles of aggregates separated from each other based on particle size, and a measuring device for metering a quantity of individual particles of aggregates in selected groups from among the plurality of groups, said blending device being configured for dispensing all or a part of the plurality of classified and metered groups of particles onto the road surface said blender vehicle being further provided with a device for maintaining the scarified and loosened asphalt mixture at a temperature which is sufficiently high to prevent re-aggregation of the loosened individual particles of the aggregates through solidification of the asphalt; d) said mixer vehicle being provided with a mixing device including a pug mill adapted to be disposed against the road surface and having a front inlet and a rear outlet for receiving all or a part of the individual particles in the selected groups which have been dispensed onto the road surface and uniformly mixing the received materials and dispensing again, said mixer vehicle being further provided adjacent to said mixing device with a spreading/compacting device including one or more sets of auger and screed for spreading and compacting all or a part of the uniformly mixed and dispensed groups of materials to provide a renewed asphalt mixture layer, said mixer vehicle being further provided with a device for maintaining the scarified and loosened asphalt mixture at a temperature which is sufficiently high to prevent re-aggregation of the loosened particles of the aggregates through solidification of the asphalt. 14. The motor-driven vehicle system as defined in claim 13, wherein said pre-heater vehicle comprises one or more vehicles, each having at least a heating device adapted to be disposed against the asphalt mixture layer to be softened and apply heat thereto. 15. The motor-driven vehicle system as defined in claim 13, wherein said scarifying and loosening device of said miller vehicle includes one or more grinders. 16. The motor-driven vehicle system as defined in claim 13, said miller vehicle being further provided in front of said scarifying and loosening device with a heating device adapted to be disposed against the asphalt mixture layer to be softened for applying heat continuously thereto. 17. The motor-driven vehicle system as defined in claim 13, wherein a reservoir for a rejuvenating agent is provided rearwards of said scarifying and loosening device of the miller vehicle, and/or, rearwards of or in front of said mixing device of the mixer vehicle, said rejuvenating agent being added to the asphalt mixture which has been scarified and loosened by said scarifying and loosening device of the miller vehicle, and/or, to the asphalt mixture which has been classified and metered by said blending device of he blender vehicle. 18. The motor-driven vehicle system as defined in claim 13, said miller vehicle further including a receiving/transporting device comprising a receiving section including a hopper provided at a front portion and a transport section including a conveyor provided at an upper portion, said receiving/transporting device being adapted to receive a fresh asphalt mixture (new materials) supplied exteriorly of the motor-driven vehicle system under a temperature wherein re-aggregation of the loosened particulate materials can be prevented, and to transport the fresh asphalt mixture to the blender vehicle. 19. The motor-driven vehicle system as defined in claim 13, wherein said screening device in said blending device of said blender vehicle is configured for screening the divided individual particles of the aggregates of the asphalt mixture to provide at least two groups comprising fine aggregates and coarse aggregates, or three groups comprising fine aggregates, medium aggregates and coarse aggregates in accordance with particle sizes. 20. The motor-driven vehicle system as defined in claim 13, wherein said metering device in said blending device of said blender vehicle is configured for measuring each of groups classified into a plurality of groups of different particle size distributions in accordance with particle sizes. 21. The motor-driven vehicle system as defined claim 13, wherein said blender vehicle further includes a storing device for storing one or more unused groups of particles of different particle sizes in the plurality of groups, and for discharging them out of the motor-driven vehicle system. 22. The motor-driven vehicle system as defined in claim 18, wherein said blender vehicle includes a receiving/transporting/discharging device for receiving, transporting and discharging the fresh asphalt mixture (new materials) from the receiving/transporting device of the miller vehicle under a temperature wherein re-aggregation of the loosened particulate materials can be prevented, said receiving/transporting/discharging device having a discharging section including two discharge ports arranged one after the other, one of said discharge ports located in front of the other discharge port being adapted to add said fresh asphalt mixture (new materials) to all or a part of the materials in plurality of groups of different particle size distributions which has previously dispensed onto the road surface by the blender vehicle, said mixing device of the mixer vehicle being adapted to uniformly mix the materials added with the fresh asphalt mixture. 23. The motor-driven vehicle system as defined in claim 22, wherein said mixer vehicle is further provided in front of the mixing device of the vehicle with a storing device such as a tank for storing fresh asphalt to be used as modifying agent, whereby the fresh asphalt is added to all or a part of the materials in the plurality of groups which has been dispensed onto the road surface by said blending device of said blender vehicle, said mixing device being adapted to mix them uniformly. 24. The motor-driven vehicle system as defined in claim 22, wherein said blender vehicle is further provided, adjacent to said other discharge port located rearwards of said one discharge port of said receiving/transporting/discharging device of the vehicle, with a mixing device such as a pug mill having an inlet and an outlet device and, between said mixing device and said blending devices with a transporting device such as a conveyor for receiving a part of the classified and measured materials in the plurality of groups of different particle size distributions and for transporting the materials to said mixing device, whereby said part of the classified and measured materials in the plurality of groups of different particle size distributions is introduced into said mixing device from an opening thereof and the fresh asphalt mixture (new materials) is added thereto to be uniformly mixed in said mixing device. 25. The motor-driven vehicle system as defined in claim 24, wherein said blender vehicle further includes a storing device such as a tank for storing a supply of fresh asphalt as modifying agent in the vicinity of said mixing device of the vehicle, whereby the supply of fresh asphalt is added to a part of the plurality of groups which is being mixed in said mixing device. 26. The motor-driven vehicle system as defined in claim 24, wherein said mixing device of said blender vehicle is configured to add a supply of the fresh asphalt mixture (new materials) to a part of the plurality of groups of the classified and measured particles to uniformly mix them together to thereby provide a second regenerated asphalt mixture, said mixing device of the blender vehicle being further configured to add a supply of the fresh asphalt mixture (new materials) to all or a part of the remainder of the plurality of groups of the classified and measured particles to uniformly mix them together to provide a first regenerated asphalt mixture. 27. The motor-driven vehicle system as defined in claim 26, wherein said mixer vehicle is further provided adjacent to said mixing device with two sets including a first set and a second set of spreading/compacting devices such as two sets of augers and screeds, the first set of said spreading/compacting devices being configured for spreading and compacting said first regenerated asphalt mixture to form a first renewed asphalt mixture layer, the second set of said spreading/compacting devices being configured for spreading and compacting said second regenerated asphalt mixture to form a second renewed asphalt mixture layer over said first renewed asphalt mixture layer, to thereby provide a two-layered asphalt construction device. 28. The motor-driven vehicle system as defined in claim 27, wherein said first renewed asphalt mixture layer is at least a dense graded asphalt mixture layer which is water impermeable. 29. The motor-driven vehicle system as defined in claim 27, wherein said second renewed asphalt mixture layer is an open graded asphalt mixture layer which is water permeable. 30. The method as defined in claim 7, wherein said renewed asphalt mixture layer is one of a dense graded asphalt mixture which is water impermeable, an open graded asphalt mixture layer which is water permeable, and another asphalt mixture layer.