초록 ▼

A method for providing hot-in-place recycling and repaving of an existing asphalt-based pavement, in which the pavement is first heated. The heated pavement surface is then sacrified, and new aggregate is dispensed onto it, to form a recycled, preheated asphalt and aggregate mixture. This mixture is

A method for providing hot-in-place recycling and repaving of an existing asphalt-based pavement, in which the pavement is first heated. The heated pavement surface is then sacrified, and new aggregate is dispensed onto it, to form a recycled, preheated asphalt and aggregate mixture. This mixture is again heated and scarified to premix it, and a new pavement surface is now milled to grade and width by applying this mixture using a plurality of extension mills having a main frame. The pavement surface is then remilled to grade using a main mill. Rejuvenator fluid is introduced in the main mill, and mixed with the recycled asphalt and aggregate mixture. Rejuvenator fluid is also introduced into a pug mill and again mixed with the recycled asphalt and aggregate mixture. The rejuvenator-enriched, recycled asphalt and aggregate windrow thus formed is then laid to grade using one or more screeds.

대표청구항 ▼

1. A method for providing hot-in-place recycling and repaving of an existing asphalt-based pavement, comprising the steps ofheating a surface of the pavement using at least one preheater unit;scarifying the heated surface of the pavement in a first scarification process using a first set of scarifyi

1. A method for providing hot-in-place recycling and repaving of an existing asphalt-based pavement, comprising the steps ofheating a surface of the pavement using at least one preheater unit;scarifying the heated surface of the pavement in a first scarification process using a first set of scarifying rakes;collecting scarified asphalt in a first collection process from around utility structures and releasing moisture contained in the scarified asphalt in a first moisture release process;dispensing new aggregate onto the heated and scarified asphalt surface to form a recycled, preheated asphalt and aggregate mixture, using an aggregate bin for the dispensing; andproviding a recycling machine performing the following steps:a. heating the recycled preheated asphalt and aggregate mixture to within a predetermined temperature range using one or more heaters;b. scarifying the recycled heated asphalt and aggregate mixture in a second scarification process using a second set of scarifying rakes to premix the recycled asphalt and aggregate mixture and form a new recycled asphalt and aggregate mixture, the second scarification process releasing moisture contained in the new recycled asphalt and aggregate mixture in a second moisture release process;c. collecting the new recycled asphalt and aggregate mixture in a second collection process;d. milling the pavement surface to grade and width by applying a mixing application of the new recycled asphalt and aggregate mixture using a plurality of extension mills having a main frame, the extension milling process releasing moisture contained in the new recycled asphalt and aggregate mixture in a third moisture release process;e. remilling the pavement surface to grade by applying a mixing application of the new recycled asphalt and aggregate mixture using a main mill, the main milling process releasing moisture contained in the new recycled asphalt and aggregate mixture in a fourth moisture release process;f. introducing in the main mill a first application of rejuvenator fluid containing first liquid additives to the new recycled asphalt and aggregate mixture using a rejuvenator application system, and mixing the first liquid additives and the new recycled asphalt and aggregate mixture;g. introducing in a pug mill a second application of rejuvenator fluid containing second liquid additives to the new recycled asphalt and aggregate mixture using the rejuvenator application system, the pug mill having first and second downwardly rotating rotors for mixing, wherein a substantially homogenous mixture of rejuvenator-enriched, recycled asphalt and aggregate windrow is formed, and wherein during mixing moisture contained in the windrow is released in a fifth moisture release process; andh. laying the homogeneously mixed windrow to grade using at least one screed. 2. The hot-in-place recycling and repaving method of claim 1, further comprising the step after step g. of splitting the windrow and providing further mixing of the windrow using an auger. 3. The method of hot-in-place recycling and repaving of claim 1, wherein during steps e. and g. in the fourth and fifth moisture release processes, moisture is released by negative pressure applied at the main mill and the pug mill. 4. The method of hot-in-place recycling and repaving of claim 1, wherein a set of spring-loaded blades is attached to the first and second sets of scarifying rakes to facilitate the loosening and collection of asphalt and/or aggregate located around obstructions. 5. The method of hot-in-place recycling and repaving of claim 1, wherein the aggregate dispensing bin is linked to an on-board computer of the recycling machine which uses a volume of the asphalt and aggregate being recycled as a reference to control a rate of aggregate distribution. 6. The method of hot-in-place recycling and repaving of claim 1, wherein the aggregate dispensing bin is linked to means for determining the width and/or the profile of the pavement sur face. 7. The method of hot-in-place recycling and repaving of claim 6, wherein the width determining means comprises two extendable arms. 8. The method of hot-in-place recycling and repaving of 6 , wherein the profile determining means comprises mechanical or sonic sensors. 9. The method of hot-in-place recycling and repaving of claim 1, wherein the pug mill comprises one or more blades for collecting and scraping material. 10. The method of hot-in-place recycling and repaving of claim 1, wherein one or both of the first and second liquid additives are introduced using an electronically pulsed, positive displacement pump. 11. The method of hot-in-place recycling and repaving of claim 1, wherein one or both of the first and second liquid additives are introduced using air pressure to partially atomize the liquid additive for greater surface coverage. 12. The method of hot-in-place recycling and repaving of claim 1, wherein the rejuvenator application system may be automatically purged and cleaned by using forced air and flushing liquids without damaging the environment. 13. The method of hot-in-place recycling and repaving of claim 1, wherein the rejuvenator application system heats the rejuvenator liquid using on-board storage tanks that utilize waste heat generated by an on-board system using a heat exchanger. 14. The method of hot-in-place recycling and repaving of claim 1, wherein the rejuvenator application system further comprises on-board storage tanks fitted with temperature measuring devices for measuring the temperature of the rejuvenator fluid and providing a correction factor using an on-board electronic control system. 15. The method of hot-in-place recycling and repaving of claim 1, further comprising the step of using a ski to exert pressure on the material flow exiting the pug mill, wherein the pressure exerted by the ski increases when there is a decrease in drive pressure of the pug mill rotors and decreases when there is in increase in drive pressure of the pug mill rotors. 16. The method of hot-in-place recycling and repaving of claim 1, wherein the extension mills are comprised of a plurality of sections, each section being capable of articulating about at least one pivot point using one or more hydraulic cylinders. 17. The method of hot-in-place recycling and repaving of claim 1, wherein the rotors of the extension mills are configurable to create a grade that is crowned independently of the main frame of the extension mills. 18. The method of hot-in-place recycling and repaving of claim 1, wherein the rotors of the extension mills are configurable to create a grade that has a positive or negative crown in relation to the main frame of the extension mills. 19. The method of hot-in-place recycling and repaving of claim 1, wherein the aggregate dispensing bin includes a plurality of movable blades and one or more rotors, and the amount of material which is dispensed from the bin is controlled by varying the distance between the blades and the rotor. 20. The method of hot-in-place recycling and repaving of claim 19, wherein passage of oversized objects through the bin is permitted by increasing the distance between the blades and the rotor(s). 21. The method of hot-in-place recycling and repaving of claim 1, wherein the first and second rotors of the pug mill are independently driven and non-intermeshing to provide improved material flow and mixing. 22. The method of hot-in-place recycling and repaving of claim 1, wherein the first and second rotors of the pug mill have differing diameters, and the second rotor is larger in diameter to provide increased mixing and material volume flow. 23. The method of hot-in-place recycling and repaving of claim 1, further comprising the step of averaging changes in grade height to maintain a consistent grade height for the mainframe and/or the main mill and/or the pug mill, using a plurality of cross-linked, averaging skis and grade stations associated with the recycling m achine. 24. The method of hot-in-place recycling and repaving of claim 23, wherein the consistent grade height is used to adjust the position of the main mill and the extension mills. 25. The method of hot-in-place recycling and repaving of claim 23, wherein the consistent grade height is used to adjust the position of the main frame. 26. The method of hot-in-place recycling and repaving of claim 1, further comprising the step of averaging changes in grade height to maintain a consistent grade height using a plurality of longitudinally-linked skis and grade stations associated with the recycling machine. 27. The method of hot-in-place recycling and repaving of claim 26, further comprising the step of averaging changes in the grade height to maintain the consistent grade height for the main frame and/or the mills using a plurality of longitudinally-linked contactless sensors. 28. The method of hot-in-place recycling and repaving of claim 27, further including a dampening means in the grade station in communication with the sensors for filtering out sudden grade changes. 29. The method of claim 23, further comprising a cross-slope measuring device. 30. The method of claim 2, further comprising the step of directing the windrow flow into the auger feeding the screed, using a divider positioned between the pug mill and the screed and rotatable about an axis. 31. The method of claim 2, further comprising the step of providing additional the recycled asphalt and aggregate mixture into the area of the auger where there is a deficiency of material, using a surge bin having a plurality of discharge ports.