KR20080066549A - A method for manufacturing asphalt mixtures - Google Patents

Abstract

A method for manufacturing asphalt mixtures is provided to prevent fraction from combusting, degrading, and attaching to the inner wall of a drum during heating by heating aggregate in a drum indirectly. A method for manufacturing asphalt mixtures includes the steps of: heating recycle single size aggregates containing different components, whose grain sizes are different, gained from asphalt waste by using a drier(8); and mixing the recycle single size aggregates with additives and asphalt. During the heating process, the drier includes a rotative drum, a heating burner, and an inner tank. The rotative drum is inclined gradually from one end to the other. Inside the rotative drum, the heating burner fires flames to one end from the other. The inner tank surrounds the flames of heating burner. Some or all of the recycle single size aggregates are fed into the drum through one end of the rotative drum, and then withdrawn at the other end.

Description

Manufacturing method of asphalt mixture {A METHOD FOR MANUFACTURING ASPHALT MIXTURES}

The present invention relates to a method for producing an asphalt mixture, and more particularly, to a method for producing an asphalt mixture using asphalt waste as a raw material.

Recently, some of the asphalt waste generated from the repair of the pavement is recycled as a raw material of the asphalt mixture.

11 is a flow sheet showing a conventional method for producing an asphalt mixture using asphalt waste as a raw material.

According to the conventional method shown in Fig. 11, the asphalt mass (waste) is fed to the crushing device A, crushed to form recycled aggregate B having a particle size of 13 mm or less, and then stored in the hopper J.

On the other hand, the new aggregate is accommodated in the hoppers (C) to (H). Specifically, screenings for hopper C, fine sand for hopper D, coarse sand for hopper E, 2.5 to 5 mm components for hopper F, and 5 to 13 mm for hopper G. 13-20 mm components are accommodated in the component and the hopper H, respectively. On the other hand, the hopper I is reserved.

The new aggregate contained in the hoppers (C) to (H) is fed directly to the heated dryer (K), heated, classified by the hot screen (M), and then to the metering device (N) with a hot bin. .

On the other hand, the recycled aggregate accommodated in the hopper (J) is supplied to the indirect heating dryer (L) is heated.

Aggregate (new aggregate) metered by the metering device (N) and aggregate (regenerated aggregate) heated by an indirect heating dryer (L) are supplied to the mixer (R) together with stone powder, additives, and asphalt and mixed. In addition, (O) in a figure is a stone powder tank, (P) is an additive tank, and (Q) is an asphalt tank.

The mixture obtained by mixing by the mixer R is loaded into the silos S as recycled asphalt mixture and recycled.

In the conventional method, the recycled aggregate (B) obtained by crushing the asphalt agglomerate contains a lot of oil, and when heated by a direct heating dryer, combustion or deterioration of the oil occurs, so that the heated aggregate is heated by an indirect heating dryer (L). .

However, since the indirect heating dryer has a lower heating capacity than the direct heating dryer, there is a problem that it is difficult to raise the aggregate temperature to the optimum temperature in the mixing step of the post-process. Specifically, the aggregate temperature can be raised up to about 160 ° C. even when there is no deposit on the inner wall of the drum, and when the oil (asphalt) is attached to the inside of the drum due to use, the temperature can only be raised to about 140 ° C.

In addition, when producing a drainage recycled mixture used for drainage packaging, it is necessary to raise the aggregate temperature to 180 ° C or higher because high viscosity, modified, and asphalt are used. However, there is a problem that the regenerated mixture obtained is stuck to the dump car or the dryer because the indirect heating dryer cannot heat the aggregate at such a high temperature.

As a technique which can solve the problem of such a prior art, the starting technique of following patent document 1 (Unexamined-Japanese-Patent No. 3612030) is mentioned.

In this method, after crushing the asphalt waste in the preceding step, the oil film coated on the crushed object is removed by a grinding machine or the like, and sieved to obtain a plurality of components having different particle size ranges. Send to post-process as shown.

In the subsequent step, a plurality of components having different particle size ranges contained in separate hoppers A, B, C, D, and E (0 to 2.5 mm, 2.5 to 5 mm, 5 to 13 mm, 13 to 20 in the illustrated example). The 0-2.5 mm component which contains a lot of oil in 4 mm of (mm) is indirectly heated by indirect heating dryer H1, and is heated directly by the direct heating dryer H2 about the remaining component with little oil.

The components indirectly heated by the indirect heated dryer H1 are directly supplied to the mixer K. On the other hand, the components directly heated by the direct-heat heater H2 are passed through a metering device with a screen S and a hot bin. Supplied to (K). And both of these components are mixed in the mixer K together with the additive supplied from the additive tank I and the asphalt supplied from the asphalt tank J to obtain a recycled asphalt mixture.

In the method disclosed in Patent Literature 1, indirect heating at a low temperature is carried out at low temperature using an indirect heating heater for small particle size components having a high oil content, while direct heating type having high heating capability for components having a low oil content. By heating them directly to a high temperature with a dryer and then mixing them, the combustion and deterioration of the oil can be prevented and the shortage of heating by the indirect heating dryer can be compensated by the heating by the direct heating dryer, and the temperature is optimal for the mixing process. You will be able to raise the aggregate temperature.

Thus, the method described in Patent Document 1 is excellent in that it can solve the problems of the conventional method described above. However, since two types of dryers must be used in combination, the processing process is complicated and the equipment cost becomes high compared with the conventional method. there was.

As a method for producing an asphalt mixture from asphalt waste as a raw material, many other methods have been proposed (for example, Patent Document 2 (Japanese Patent Application Laid-Open No. 7-197412), Patent Document 3 (Japanese Patent Publication 2002-)). 129514).

In general, however, recycled asphalt mixtures prepared from asphalt waste as raw materials are commonly used due to the fact that the asphalt coating (oil) adheres to the surface of the recycled aggregate which is a raw material, and that the oil is degraded by heating. Compared with the asphalt mixture, there was a problem of poor quality.

On the other hand, the drainage pavement that is rapidly spreading in recent years is expected to require large-scale repair in the future and a large amount of waste is expected to be discharged.

However, in the drainage pavement, since high viscosity modified asphalt is used because the voids are bonded between aggregates, high viscosity modified asphalt adhered to the surface of the recycled aggregate is sufficiently removed when producing recycled aggregate from drainage paving waste. The problem arises.

In particular, when the recycled aggregate obtained from drainage pavement waste is used for the production of the asphalt mixture, since the high viscosity modified asphalt attached to the small particle component is extremely difficult, a large amount of the high viscosity 때문에 modified asphalt attached to the small particle component is dried in the heating process. There is a possibility of adverse effects such as adhesion to the inner wall, which makes it difficult to recycle drainage packaging waste.

The present invention has been made to solve the above-mentioned problems of the prior art, in the method for producing an asphalt mixture using asphalt waste as a raw material, the combustion or deterioration of the oil in the heating step by the dryer, the adhesion of oil to the inside of the drum It is an object of the present invention to provide a method for producing a high-quality asphalt mixture without achieving a shortage of heating temperature for the aggregate, while achieving a lower cost of equipment and a simplified processing process.

In addition, the present invention provides a method for producing an asphalt mixture using asphalt waste as a raw material, which is capable of producing a high quality asphalt mixture equivalent to a conventional asphalt mixture and at the same time effectively recycling wastewater pavement waste. .

The invention according to claim 1 is a heating step for regenerating single grain size crushed stone by a dryer using regenerated single grain size crushed stone composed of a plurality of components having different particle size ranges obtained from asphalt waste, and regeneration after heating. A method for producing an asphalt mixture, comprising a mixing step of mixing a single-grained crushed stone with an additive and asphalt, wherein in the heating step, a rotating drum disposed inclined so as to be gradually lowered from one end to the other end, and in the rotating drum. And a dryer having a heating burner radiating flame from one end to the other end and an inner cylinder mounted to cover the flame circumference of the heating burner, wherein a part or all of the single particle sized crushed stone composed of the plurality of components is removed. And feed into the drum from one end of the rotary drum of the dryer. By the other end side, it relates to a method for producing an asphalt mixture, characterized in that taken out.

In the invention according to claim 2, a plurality of scrap vanes protrude from the inner circumferential surface of the rotary drum at predetermined intervals in the circumferential direction, and the scrap vanes are formed of a cylindrical member extending in the drum length direction, and the cylindrical member is a drum It is related with the manufacturing method of the asphalt mixture of Claim 1 which is attached in the state which floated in the inner peripheral surface.

The invention according to claim 3, wherein the length of the inner cylinder is a length at which the flame protrudes from the tip of the inner cylinder, and at least a length covering the flame circumference at a position where the single-grained crushed stone enters the drum. It relates to a method for producing the asphalt mixture according to the above.

The invention according to claim 4 is a component having the smallest particle size among the plurality of components of the recycled short grain size crushed stone used as the raw material, and using the small particle size component of the recovered short grain size crushed stone obtained from the wastewater packaging waste. The manufacturing method of the asphalt mixture as described in any one of Claims 1-3.

The invention according to claim 5 is a component having the smallest particle diameter among the plurality of components of the recycled short grain sized crushed stone used as the raw material, and a small particle size component of the recycled single grain sized crushed stone obtained from the drainable waste pavement waste and the recycled stage obtained from the asphalt pavement waste. A method for producing the asphalt mixture according to any one of claims 1 to 3, which uses a mixture with a small particle size component of particle size crushed stone.

The invention according to claim 6, wherein, in the mixing step, the small particle size component of the regenerated short-grained crushed stone obtained from the wastewater packaging waste is mixed at room temperature, wherein the asphalt according to any one of claims 1 to 3 It relates to a method for preparing the mixture.

The invention according to claim 7, wherein, in the mixing step, a mixture of the small particle size component of the recycled short grain size crushed stone obtained from the wastewater " package " It is related with the manufacturing method of the asphalt mixture in any one of Claims 1-3 characterized by the above-mentioned.

The invention according to claim 8 is a component having the smallest particle diameter among the plurality of components of the recycled single-grained crushed stone used as the raw material, and the regenerated stage obtained from the small particle size component of the recycled single-grained crushed stone obtained from the wastewater-packaging waste and the asphalt pavement waste. In the mixing step, in the mixing step, a small particle size component of the regenerated short grain size crushed stone obtained from the wastewater-packaged waste and a small particle size component of the regenerated short-grained crushed stone obtained from the asphalt pavement waste. The method for producing the asphalt mixture according to any one of claims 1 to 3, wherein the mixture is mixed at room temperature.

According to the invention according to claim 1, in the heating step by the dryer, the aggregate supplied in the drum can be heated using hot air, radiant heat via flame, and flame radiant heat instead of direct heating by flame. Aggregate containing a lot of components does not burn, deteriorate or adhere oil to the drum's inner wall by heating, and can be heated to a higher temperature (for example, up to 210 ° C) than indirect heating. The aggregate temperature can be raised to the temperature most suitable for the mixing process and high quality asphalt mixtures can be produced. Furthermore, a single dryer can cope with both dense asphalt mixtures and drainage regeneration mixtures, which reduces equipment costs and simplifies the process compared to the use of two types of dryers, direct heating and indirect heating. Can be.

According to the invention according to claim 2, since the scrap blades are provided in a cylindrical member and floated on the inner circumferential surface of the drum, the amount of asphalt adhesion to the inner surface of the rotating drum can be greatly reduced. This prevents a reduction in heating efficiency and at the same time reduces the scraping time for removing deposits.

According to the invention according to claim 3, by shortening the inner cylinder length and actively protruding the flame from the tip of the inner cylinder, the amount of heat radiated from the flame to the aggregate is greatly increased, and the heating efficiency of the aggregate can be greatly improved, and the aggregate temperature is mixed. It is possible to raise the temperature to the optimal temperature in a short time with more certainty. In addition, at the position where the aggregate enters the drum, by covering around the flame, it is possible to prevent burning or deterioration of the oil adhering to the aggregate surface and oil adhesion to the drum inner circumferential surface.

According to the invention according to claim 4, the regeneration obtained from drainage waste packaging waste by using the small grain size component of the waste recycling waste granules obtained from the drainage waste packaging waste as the smallest particle diameter among the plurality of components of the recycled grain size fragment litter used as raw materials. High viscosity, modified asphalt, which is contained in the small particle size component of the short-grained crushed stone, contributes greatly to the quality improvement of the finally obtained asphalt mixture, and as a result, it becomes possible to produce a high-quality asphalt mixture equivalent to that of a conventional asphalt mixture.

Specifically, the grasping force and the adhesive force become stronger, the stability of the asphalt mixture is improved, the thickness of the asphalt becomes thicker, and the resistance to deterioration due to the effects of daylight or air is improved, and the asphalt Since the adhesion is improved, the water resistance (peel resistance) is improved, and since the softening point is higher than that of ordinary asphalt (straight asphalt), the resistance to plastic deformation is improved, and wheel marks are less likely to occur.

In addition, it is possible to effectively use drainage packaging waste, which was conventionally considered to be difficult to recycle.

According to the invention according to claim 5, the smallest particle diameter among the plurality of components of the recycled single-grained crushed stone used as raw materials, the small-sized particle component of the recycled single-grained crushed stone obtained from the wastewater-packaged waste, and the recycled stage obtained from the asphalt pavement waste By using the mixture with the small particle size component of particle size crushed stone, it can suppress that a high viscosity modified asphalt adheres to a dryer in a heating process.

According to the invention according to claim 6, in the mixing step, by mixing the small particle size components of the recycled single-grained crushed stone obtained from the wastewater-packed waste at room temperature, it is not necessary to heat the regenerated single-grained crushed stone obtained from the wastewater-packaged waste with a dryer. It is possible to prevent the high viscosity modified 스 asphalt from adhering to the dryer.

According to the invention according to claim 7, in the mixing step, a mixture of the small particle size component of the recycled short grain size crushed stone obtained from the drainage-packaging-waste and the small particle size component of the regenerated single grain size crushed stone obtained from the asphalt pavement waste is mixed at room temperature. The effect can be obtained.

First, the regeneration short-grained crushed stone obtained from the wastewater, packaging and waste is not required to be heated by a dryer, so that the high viscosity, modified and asphalt can be prevented from adhering to the dryer in the heating step.

In addition, the regeneration short granules obtained from asphalt pavement waste can be eliminated or reduced in the process of heating with a drier for small oily components having a lot of oil in the crushed stone, so that combustion and deterioration of the oil can be suppressed.

According to the invention according to claim 8, the smallest particle diameter among the plurality of components of the recycled short grain sized crushed stone used as raw materials, the small particle size component of the recycled single grain sized crushed stone obtained from the wastewater-packaged waste, and the recycled stage obtained from the asphalt pavement waste. A mixture of the small particle size component of the reclaimed short grain size crushed stone obtained from the drainage pavement waste and the small particle size component of the regenerated short particle size crushed stone obtained from the asphalt pavement waste in a mixing step using a mixture with the small particle size component of the particle size crushed stone. By mixing at room temperature, it is possible to more reliably prevent the adhesion of the high viscosity modified asphalt to the dryer when heating the drainable packaging waste and the burning or deterioration of the oil when the asphalt paving waste is heated.

Hereinafter, a method for manufacturing an asphalt mixture according to the present invention will be described with reference to the drawings.

1 is a flow sheet showing a first embodiment of a method for producing an asphalt mixture according to the present invention.

First, the manufacturing apparatus for implementing the manufacturing method of 1st Embodiment described in a flow sheet is demonstrated.

On the other hand, in the present invention, the term 'asphalt waste' is intended to include both wastes obtained from ordinary asphalt pavement (waste of the high density asphalt mixture) and wastes obtained from drainage pavement (waste of the drainage-packaging mixture). The term 'asphalt packaging waste' is used to mean the former, and the term 'drainage' packaging and waste 'is used to mean only the latter.

In addition, the term 'asphalt' is used to include both the straight asphalt used in the conventional asphalt pavement and the high viscosity modified asphalt used in the drainage pavement, and in the case of the former, the term 'straight asphalt' is used. In the case of only the latter, the term 'high viscosity modified asphalt' is used.

In addition, the "small particle size component" of the regeneration short-grained crushed stone obtained from the wastewater-packed waste refers to the smallest particle size among the regeneration short-grained crushed stone obtained from the wastewater-packaged waste. The specific particle size range varies depending on the classification method. Preferably, a component having a particle size of 0 to 2.5 mm is used, but a component of 0 to 5 mm and a component of 0 to 13 mm may be used in some cases.

The production apparatus includes a plurality of hoppers (1, 2, 3, 4, 5) each containing a recycled single-grained crushed stone (hereinafter referred to as recycled aggregate) composed of a plurality of components having different particle size and ranges obtained from asphalt waste, and each hopper. Supply device 7 for supplying the component extracted from the feeder to the conveying device, a dryer 8 for receiving and heating the recycled aggregate, and a conveying device 9 for conveying each component supplied by the supply device to the dryer. And a mixing device 10 for mixing the components heated by the dryer with asphalt.

In the hopper 1, a component having 0 to 2.5 mm of recycled aggregate, a component of 2.5 to 5 mm of recycled aggregate in the hopper 2, and a component of 5 to 13 mm of recycled aggregate in the hopper 3 are accommodated, respectively.

The hoppers 4 and 5 are reserved and used suitably as needed. For example, the granularity asphalt can be manufactured by accommodating the component (recycled aggregate or new aggregate) which is 13-20 mm in the hopper 4. In addition, the hopper 1 is not used, the component which is recycled aggregate 2.5-5 mm in the hopper 2, the component which is recycled aggregate 5-13 mm in the hopper 3, and the component which is 13-20 mm in the hopper 4 (Recycled Aggregate or New Aggregate) A large particle size asphalt can be produced by accommodating a component (recycled aggregate or new aggregate) having a thickness of 20 to 30 mm in the hopper 5. In addition, screenings (new aggregate) in the hopper (1), recycled aggregates 2.5 to 5 mm in the hopper (2), recycled aggregates 5 to 13 mm in the hopper (3), sand to the hopper (4) By containing coarse sand (new aggregate) in the aggregate and the hopper 5, the compactness asphalt can be produced.

In the present invention, however, the particle size of the single-grained crushed stone contained in each hopper can be appropriately changed depending on the blending design of the asphalt mixture (both for normal asphalt paving and for drainage and paving paving) to be the final product.

The feeder 7 is provided near each outlet of each of the hoppers 1, 2, 3, 4, and 5, and is provided with a belt conveyor 7a and a belt scale 7b mounted to the belt conveyor. It consists of a configured belt scale mounted conveyor.

The belt scale mounting conveyor is a known device capable of continuously and in real time measuring the weight of the conveyed object conveyed to the belt conveyor 7a by the belt scale 7b, for example, a load detection device mounted on the conveyor ( Load cell, etc.) and a speed detection device, and a control device for calculating a conveyance weight based on the measurement data of these devices.

The control device sends a control signal to a feeder (not shown) for supplying aggregate from the hopper to the belt conveyor 7a when the calculated conveyance amount exceeds the target value of the preset conveyance amount or does not reach the target value. In the case where the feeder is a belt feeder, the rotational speed of the belt is changed, and in the case of the vibration feeder, the frequency is changed to feedback control.

Thereby, the aggregate of each particle size range taken out from each hopper 1, 2, 3, 4, 5 is supplied to the conveying apparatus 9, being controlled so that the supply amount per unit time may always be a preset target value.

The conveying apparatus 9 is an apparatus for conveying aggregate (both recycled aggregate and new aggregate) of each component supplied by the supply apparatus 7 to the dryer 8, For example, it consists of a belt conveyor.

The dryer 8 receives the components (recycled and aggregate) and the new aggregate conveyed by the conveying apparatus 9 inside, and heats them.

2 is a schematic view showing the structure of the dryer 8, (a) is a front sectional view, and (b) is a sectional view taken along the line A-A. In addition, the arrow in a figure shows the flow direction of an aggregate.

The dryer 8 has a rotating drum 80 inclined so as to be gradually lowered from one end (inlet side) to the other end (outlet side), and the flame is directed from one end to the other end in the rotating drum 80. The radiating heating burner 81 and the inner cylinder 82 mounted so as to cover the flame circumference of the heating burner 81 are provided.

The inner cylinder 82 is a cylindrical member made of heat-resistant steel, etc., and its diameter is about 1/2 of the inner diameter of the rotating drum 80, and its length is from one end of the rotating drum 80. It is about 1/5 to 1/3 the length of the drum.

As such, the inner cylinder 82 covers the flame of the heating burner 81 so that the aggregate supplied into the drum at one end of the rotary drum 80 does not directly touch the flame, but hot air, radiant heat from the circumferential surface of the inner cylinder, from the flame. It is heated by radiant heat.

This prevents combustion or deterioration of the oil (asphalt) adhered to the surface of the recycled aggregate and asphalt adhesion to the inner circumferential surface of the drum, thereby increasing the aggregate temperature to an optimal temperature for the mixing process.

On the inner circumferential surface of the rotating drum 80, a plurality of scrap blades 83 protrude at predetermined intervals in the circumferential direction.

The scrap blades 83 are formed of a cylindrical member extending in the longitudinal direction of the rotating drum 80, and are mounted in a state of being lifted from the drum inner circumferential surface.

More specifically, the cylindrical member is made of a metal pipe, and each pipe is fixed to the inner circumferential surface of the drum 80 via the plate 84 only at both ends. As a result, the pipe is floated on the drum inner circumferential surface by the height of the plate 84 (about 50 to 100 mm).

Since the scrap blade 83 is a cylindrical member, the aggregate slips along the surface of the scrap blade, so that oil is difficult to attach. In addition, since the scrap blade 83 is floated from the drum inner circumferential surface, a space is secured between the inner circumferential surface of the rotating drum 80 and the scrap blade 83 so that the recycled aggregates can flow through the space. The deposition of adhesion of asphalt to the surface of 83 is suppressed.

The scrap vanes 83 are not provided near one end in the longitudinal direction of the rotary drum 80, but are provided to extend over a range from the vicinity of the middle to the vicinity of the other end.

As a result, the aggregate supplied from one end side of the rotating drum 80 is quietly heated without being mixed in the temperature region (about 60 to 100 ° C.) that is most likely to be attached, and is heated above the temperature region that is easy to attach and flows along the slope. And then mixed to more effectively prevent asphalt attachment to the scrap vanes 83.

In addition, near one end of the inner circumferential surface of the rotating drum 80, a spiral blade (not shown) for sending the aggregate supplied into the drum from the supply port 85 provided at one end of the rotating drum 80 to the vicinity of the middle of the drum. It is preferable to protrude).

3 and 4 are schematic front sectional views showing another structure of the dryer 8.

These dryers 8 cut the tip end of the inner cylinder 82 inclined to increase the area of the tip opening 82a.

By providing such a tip opening portion, radiant heat of flame can be applied to the aggregate at the tip opening portion, thereby improving heating efficiency.

FIG. 3 shows the front end opening 82a formed on the lower surface side, and FIG. 4 shows the front end opening 82a formed on the side surface.

Thus, when the front end opening 82a is formed in the lower surface side or the side surface side, it is preferable because deposition of aggregate to the inside of the inner cylinder 82 can be prevented.

Also, in the present invention, instead of the inner cylinder 82 covering almost the entire circumference of the flame of the heating burner 81 as shown in FIG. 2, the inner cylinder 82 is the flame of the heating burner 81 as shown in FIG. 5. The dryer 8 shortened to cover only a part of the surroundings can be used.

In this case, the length of the inner cylinder 82 is the length which a flame protrudes from the tip of the inner cylinder 82, and is the length which covers the flame circumference at least in the position where an aggregate enters a drum. Specifically, it is preferable to set the length from about one end of the rotating drum 80 to about 1/6 to about 1/10 of the drum length.

In this way, if the length of the inner cylinder 82 is shortened, the flame protrudes from the tip of the inner cylinder 82, so that the amount of radiant heat from the flame to the aggregate is greatly increased, and the heating efficiency of the aggregate can be greatly improved. You will be able to raise the temperature to the optimum temperature more reliably and in a short time. In addition, at the position where the aggregate enters the drum, it is possible to prevent burning or deterioration of oil adhered to the aggregate surface and oil adhesion to the drum inner circumferential surface by covering around the flame.

The cyclone 13, the blower 14, the deodorization path 15, and the communication 16 for purifying exhaust gas are connected to the exhaust gas discharge port from the dryer 8 (refer FIG. 1).

Among these, the deodorization path 15 burns and deodorizes the odor component which arises by heating of the asphalt adhering to the surface of the recycled aggregate.

The mixing apparatus 10 mixes the component taken out from the dryer 8 with the stone powder supplied from the stone powder tank 17, the additive supplied from the additive tank 18, and the asphalt supplied from the asphalt tank 19, This produces an asphalt mixture.

Moreover, the trolley bucket 30 is arrange | positioned under the mixing apparatus 10, The trolley bucket 30 conveys the produced asphalt mixture to the storage silo 31. Moreover, as shown in FIG.

Hereinafter, a first embodiment of the method for producing an asphalt mixture according to the present invention will be described based on the flow sheet of FIG. 1.

First, recycled aggregates composed of a plurality of components (three components having 0 to 2.5 mm, 2.5 to 5 mm, and 5 to 13 mm) having different particle diameters and ranges obtained from asphalt wastes are each separated from hoppers 1, 2, and 3 Is accommodated). In addition, the preliminary hoppers 4 and 5 can accommodate and use components (13-20 mm and 20-30 mm components) of which the particle size of a recycled aggregate or new aggregate is different as needed.

On the other hand, the above process for obtaining the recycled aggregate accommodated in the hopper will be described later.

Asphalt waste which is the raw material of recycled aggregate consists of asphalt pavement waste or drainage pavement waste or mixtures thereof.

In the present invention, the new aggregate is used as necessary to make up for the shortage of the large particle size of the recycled aggregate, and is based on crushed stone, sea gravel, river gravel, land gravel, mountain gravel, etc. A particle diameter is prepared using a conventionally well-known method.

Single-grained crushed stone (recycled aggregate) accommodated in the hoppers 1, 2, and 3 is supplied in advance by the supply device 7 made of the above-described belt scale-mounted conveyor, and the supply amount per unit time of aggregates of different particle size ranges taken out from each hopper in advance. It is supplied to the conveying apparatus 9, being controlled to become a set target value. On the other hand, in the present invention, according to the type of the asphalt mixture to be prepared as described above, the single-grained crushed stone (recycled aggregate or new aggregate) accommodated in the preliminary hoppers 4 and 5 are similarly supplied to the conveying apparatus 9. do.

In this way, by precisely controlling the amount of each component supplied from a plurality of hoppers each receiving a single particle crushed stone composed of a plurality of components having different particle size ranges, by using a belt scale mounted conveyor, it is used for adjusting the particle size after the dryer is heated. It does not require a screen that has been used, and can prevent the screen from clogging and lowering manufacturing efficiency.

The conveying apparatus 9 supplies the recycled aggregate (0-2.5 mm, 2.5-5 mm, 5-13 mm) taken out from the hoppers 1, 2, and 3 to the dryer 8.

The conveying apparatus 9 also supplies these aggregates to the dryer 8 together with the single-grained crushed stone (recycled aggregate or new aggregate) contained in the preliminary hoppers 4 and 5.

Aggregate (recycled aggregate or recycled aggregate and new aggregate) conveyed by the conveying device 9 is supplied to the inside of the drum from a supply port 85 provided at one end of the rotary drum 80, thereby rotating drum 80 The drum is moved out of the drum by the inclination and is taken out from the other end.

As described above, the aggregate supplied to the rotating drum 80 is heated by hot air, radiant heat, and radiant heat without directly contacting the flame, thereby burning or deteriorating the oil (asphalt) attached to the surface of the recycled aggregate, and the drum. It is heated to the temperature (for example, about 160-180 degreeC) optimal for a mixing process, without attaching asphalt to an inner peripheral surface.

Moreover, since the scrap blade 83 is a cylindrical member and is mounted in the state which floated on the drum inner peripheral surface, the adhesion of asphalt to a scrap blade or the drum inner peripheral surface can be suppressed significantly.

The aggregate heated by the dryer 8 is supplied to the mixing device 10 and mixed with the stone powder supplied from the stone powder tank 17, the additive supplied from the additive tank 18, and the asphalt supplied from the asphalt tank 19. As a result, an asphalt mixture which is the final product in the present invention can be obtained.

The resulting asphalt mixture is supplied to and stored in the silo 31 by the trolley bucket 30.

6 to 9 are flow sheets showing second to fifth embodiments of the method for producing an asphalt mixture according to the present invention, respectively.

First, the manufacturing apparatus described in each flow sheet is demonstrated.

The production apparatus includes a plurality of hoppers (1, 2, 3, 4, 5, 6) each containing regenerated single-grained crushed stone (recycled aggregate) composed of a plurality of components having different particle size ranges from asphalt waste, and taken out from each hopper. A supply device 7 for supplying the components to the conveying apparatus, a dryer 8 for receiving and heating the recycled aggregate, a conveying apparatus 9 for conveying each component supplied by the supply apparatus to the dryer, The mixer 10 which mixes the component heated by the said dryer with asphalt, and the hoppers 11 and 12 which receive the recycled aggregate supplied to a mixing apparatus without passing through a dryer are provided.

The feeder 7 is provided near the outlet of each hopper 1, 2, 3, 4, 5, 6, 11, 12, respectively, and is a belt conveyor 7a and a belt scale 7b mounted to the belt conveyor. It consists of a belt scale mounting conveyor like 1st Embodiment comprised of (1).

Thereby, the recycled aggregate of each particle size range taken out from each hopper (1, 2, 3, 4, 5, 6, 11, 12) is supplied to the conveying apparatus 9 while being controlled so that the supply amount per unit time will always be a preset target value. Will be.

The conveying apparatus 9 is an apparatus for conveying each component supplied by the supply apparatus 7 to the dryer 8 or the mixing apparatus 10, For example, it is comprised by a belt conveyor.

The dryer 8 receives internally the component conveyed by the conveying apparatus 9, and heats it, and similarly to 1st Embodiment, the dryer which consists of the structure shown in FIGS. 2-5 is used.

The cyclone 13, the blower 14, the deodorization path 15, and the communication 16 are connected to the exhaust gas discharge port from the dryer 8 similarly to 1st Embodiment.

In addition, the mixing apparatus 10, the stone powder tank 17, the additive tank 18, the asphalt tank 19, the trolley bucket 30, and the silo 31 are provided in the same manner as in the first embodiment. It is used like embodiment.

Hereinafter, a second embodiment of the method for producing an asphalt mixture according to the present invention will be described based on the flow sheet of FIG. 6.

First, a recycled aggregate composed of a plurality of components (four components having 13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, and 0 to 2.5 mm) having different particle diameters and ranges obtained from asphalt pavement / waste is each a separate hopper (1, 2, 3, 4). In addition, a recycled aggregate composed of the smallest particle size range (0 to 2.5 mm) obtained from the drainage packaging waste is accommodated in separate adjacent hoppers 5.

The remaining hoppers 6, 11 and 12 are used as spare hoppers, and recycled aggregates obtained from asphalt pavement waste or drainage pavement waste, or new aggregates are used as needed.

The recycled aggregate accommodated in the hoppers 1, 2, 3, 4, and 5 is supplied in advance by the feeding device 7 made of the above-described belt scale-mounted conveyor, and the supply amount per unit time of the aggregate of the different particle size range taken out from each hopper is preset. It is supplied to the conveying apparatus 9, being controlled to become a target value.

By precisely controlling the amount of each component supplied from the plurality of hoppers using a belt scale mounting conveyor, it does not require the screen used for the particle size adjustment after the dryer is heated, and prevents the screen from clogging and lowering the manufacturing efficiency. can do.

The conveying apparatus 9 supplies the recycled aggregate taken out from the hoppers 1, 2, 3, 4, and 5 to the dryer 8.

The aggregate conveyed by the conveying apparatus 9 is supplied into the drum from the supply port 85 provided at one end of the rotating drum 80, and the inside of the drum is rotated by the rotation and inclination of the rotating drum 80. It moves and is taken out from the other end.

As described above, the aggregate supplied to the rotating drum 80 is heated by hot air, radiant heat and radiant heat without directly contacting the flame, thereby burning or deteriorating the oil (asphalt) attached to the surface of the recycled aggregate, and the drum inner peripheral surface. It is heated to the temperature (for example, about 160-180 degreeC) which is optimal for a mixing process, without attaching asphalt to about.

Moreover, since the scrap blade 83 is a cylindrical member and is mounted in the state which floated on the drum inner peripheral surface, the adhesion of asphalt to a scrap blade or the drum inner peripheral surface can be suppressed significantly.

Here, the recycled aggregate aggregate heated by the dryer 8 contains 0 to 2.5 mm components obtained from the drainable packaging waste.

Drainage pavement waste contains high viscosity modified asphalt with higher viscosity than conventional straight asphalt. In particular, the 0-2.5 mm component, which is the smallest particle diameter component, contains a relatively large amount of high viscosity modified asphalt because the asphalt adhering to the surface is not sufficiently removed in the preceding step described later.

For this reason, in the heating process by a dryer, there exists a problem that the high viscosity modified asphalt adhering to the aggregate surface is easy to adhere to the inner wall of a dryer.

However, this problem is solved by using a dryer having a structure that is difficult to adhere to asphalt as described above, and using 0-2.5 mm components obtained from drainage paving waste mixed with 0-2.5 mm components obtained from asphalt paving waste. Can be.

The aggregate heated by the dryer 8 is supplied to the mixing device 10 and mixed with the stone powder supplied from the stone powder tank 17, the additive supplied from the additive tank 18, and the asphalt supplied from the asphalt tank 19. As a result, an asphalt mixture which is the final product in the present invention can be obtained.

The resulting asphalt mixture is supplied to and stored in the silo 31 by the trolley bucket 30.

Next, a third embodiment of the method for producing an asphalt mixture according to the present invention will be described based on the flow sheet of FIG.

First, a recycled aggregate composed of a plurality of components (13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, 0 to 2.5 mm) having different particle size ranges obtained from asphalt pavement wastes is provided with a separate hopper (1, 2, 3, 4). In addition, a recycled aggregate composed of the smallest particle size range (0 to 2.5 mm) obtained from the drainage packaging waste is accommodated in the hopper 12 at another location.

The remaining hoppers 5, 6 and 11 are used as spare hoppers, and recycled aggregates obtained from asphalt pavement wastes or drainage pavement wastes, or new aggregates are used as needed.

The recycled aggregate accommodated in the hoppers 1, 2, 3, 4, and 12 is supplied in advance by the supply device 7 made of the above-described belt scale-mounted conveyor, and the supply amount per unit time of the aggregate of different particle size ranges taken out from each hopper is preset. It is supplied to the conveying apparatus 9, being controlled to become a target value.

The recycled aggregate taken out from the hoppers 1, 2, 3, and 4 is supplied to the dryer 8 by the conveying apparatus 9, and is heated in the dryer 8 by the same action as in the first embodiment. Heating temperature is about 160-210 degreeC, for example.

The recycled aggregate heated by the dryer 8 is supplied to the mixing apparatus 10 together with the recycled aggregate (0 to 2.5 mm) obtained from the drainage packaging waste conveyed from the hopper 12.

And it mixes with the stone powder supplied from the stone powder tank 17, the additive supplied from the additive tank 18, and the asphalt supplied from the asphalt tank 19, and can obtain the asphalt mixture which is a final product in this invention.

The resulting asphalt mixture is supplied to and stored in the silo 31 by the trolley bucket 30.

In the third embodiment, the problem is that the high viscosity modified asphalt adheres to the dryer inner wall by supplying and mixing the recycled aggregate (0 to 2.5 mm) obtained from the drainable packaging waste to the mixer 10 at room temperature without mixing. I can solve it.

In addition, in the heating step, a dryer having a structure capable of heating at a high temperature is used, and in the mixing step, by remixing the small particle size components of the recycled single grain size crushed stone obtained from the wastewater-packaged-waste waste at room temperature, the regenerated single grains overheated in the dryer The small particle size of the regenerated short grain size crushed stone obtained from the wastewater packaging waste with respect to the crushed stone can be mixed at room temperature.

This makes it possible to compensate for the decrease in the finishing temperature due to normal temperature mixing by overheating, and to set the proper finishing temperature for easy construction.

Next, a fourth embodiment of the method for producing an asphalt mixture according to the present invention will be described based on the flow sheet of FIG. 8.

First, a recycled aggregate composed of a plurality of components (three components having 13 to 20 mm, 5 to 13 mm, and 2.5 to 5 mm) having different particle diameter ranges obtained from asphalt pavement waste is accommodated in separate hoppers 1, 2 and 3, respectively. do. In addition, recycled aggregate composed of the smallest particle size range (0 to 2.5 mm) obtained from asphalt pavement waste and recycled aggregate composed of the smallest particle size range (0 to 2.5 mm) obtained from drainage pavement waste is located in a separate place. Hoppers 11 and 12, respectively.

The remaining hoppers 4, 5 and 6 are used as spare hoppers, and recycled aggregates obtained from asphalt pavement waste or drainage pavement waste, or new aggregates are used as needed.

The recycled aggregates contained in the hoppers 1, 2, 3, 11, and 12 are supplied in advance by the feeding device 7 made of the above-described belt scale-mounted conveyor, and the supply amount per unit time of aggregates of different particle size ranges taken out from each hopper is preset. It is supplied to the conveying apparatus 9, being controlled to become a target value.

The recycled aggregate taken out from the hoppers 1, 2, 3 is supplied to the dryer 8 by the conveying apparatus 9, and is heated in the dryer 8 by the same action as that of the first embodiment. Heating temperature is about 160-210 degreeC, for example.

The recycled aggregate heated by the dryer 8 is a recycled aggregate (0 to 2.5 mm) obtained from the asphalt pavement waste conveyed from the hopper 11 and a recycled aggregate obtained from wastewater-packed waste containing waste conveyed from the hopper 12 ( 0 to 2.5 mm) is supplied to the mixing apparatus 10.

Then, by mixing with the stone powder supplied from the stone powder tank 17, the additive supplied from the additive tank 18, and the asphalt supplied from the asphalt tank 19, the asphalt mixture which is the final product in this invention can be obtained.

The resulting asphalt mixture is supplied to and stored in the silo 31 by the trolley bucket 30.

Also in the fourth embodiment, the high viscosity-modified asphalt is dried on the inner wall of the dryer by supplying and mixing the recycled aggregate (0 to 2.5 mm) obtained from the drainage packaging waste to the mixer 10 at room temperature without supplying it to the dryer as in the third embodiment. This can solve the problem of being attached to.

Further, in the fourth embodiment, the mixing device (at room temperature) is not supplied to the dryer even for the smallest particle size (0 to 2.5 mm) in which the most amount of asphalt is contained among the plurality of components obtained from the asphalt pavement waste. By supplying and mixing to 10), it is possible to reliably prevent the straight asphalt from adhering to the dryer inner wall.

In addition, in the heating step, a dryer having a structure capable of high temperature heating described above is used, and in the mixing step, the regeneration short granularity excessively heated in the dryer is mixed at room temperature by mixing the small particle size components of the regenerated single particle size crushed stone obtained from the drainage-packaging-waste waste at room temperature. The small particle size of the regenerated short grain size crushed stone obtained from drainage, packaging and waste can be mixed at room temperature.

This makes it possible to compensate for the decrease in the finishing temperature due to normal temperature mixing by overheating, and to set it to an appropriate finishing temperature that is easy to construct.

Next, a fifth embodiment of the method for producing an asphalt mixture according to the present invention will be described based on the flow sheet of FIG.

First, the particle size ranges obtained from recycled aggregates and drainage waste pavement wastes consisting of a plurality of components (four components having 13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, and 0 to 2.5 mm) having different particle diameter ranges are obtained. The recycled aggregate consisting of the smallest components (0 to 2.5 mm) is housed in separate hoppers 1, 2, 3, 4 and 5, respectively.

In addition, a recycled aggregate composed of the smallest particle size range (0 to 2.5 mm) obtained from asphalt pavement waste and a recycled aggregate composed of the smallest particle size range (0 to 2.5 mm) obtained from drainage-type pavement-waste waste are separately located. Hoppers 11 and 12, respectively.

The remaining hopper 6 is used as a preliminary hopper, and recycled aggregate or new aggregate obtained from asphalt pavement waste or drainage pavement waste is used as needed.

The recycled aggregate accommodated in the hoppers 1, 2, 3, 4, 5, 11, 12 is supplied by the feeding device 7 consisting of the above-described belt scale-mounted conveyor, per unit time of aggregates of different particle size ranges taken out from each hopper. The supply amount is supplied to the conveying apparatus 9 while being controlled to be a preset target value.

The recycled aggregate taken out from the hoppers 1, 2, 3, 4, 5 is supplied to the dryer 8 by the conveying device 9, and is heated in the dryer 8 by the same action as in the first embodiment. . Heating temperature is about 160-210 degreeC, for example.

The recycled aggregate heated by the dryer 8 is obtained from the recycled aggregate (0 to 2.5 mm) obtained from the asphalt pavement waste conveyed from the hopper 11 and from the wastewater-packed waste to be conveyed from the hopper 12. It is supplied to the mixing apparatus 10 together with the recycled aggregate (0 to 2.5 mm).

And it mixes with the stone powder supplied from the stone powder tank 17, the additive supplied from the additive tank 18, and the asphalt supplied from the asphalt tank 19, and can obtain the asphalt mixture which is a final product in this invention.

The resulting asphalt mixture is supplied to and stored in the silo 31 by the trolley bucket 30.

Also in the fifth embodiment, like the second embodiment, a dryer having a structure that is hard to adhere to asphalt is used, and 0 to 2.5 mm components obtained from drainage pavement waste are mixed with 0 to 2.5 mm components obtained from asphalt pavement waste. use. In addition, a part of the recycled aggregate (0 to 2.5 mm) obtained from the wastewater, packaging and waste is supplied to the mixing apparatus 10 at room temperature and mixed without being supplied to the dryer.

This can solve the problem that the high viscosity modified asphalt is attached to the dryer inner wall.

In addition, in the heating step, a dryer having a structure capable of heating at a high temperature is used, and in the mixing step, by remixing the small particle size components of the recycled single grain size crushed stone obtained from the drainable packaging waste at room temperature, the regenerated single grain excessively heated in the dryer For crushed stone, the small particle size of the regenerated short-grained crushed stone obtained from drainage packaging waste can be mixed at room temperature.

This makes it possible to compensate for the decrease in the finishing temperature due to normal temperature mixing by overheating, and to set the proper finishing temperature for easy construction.

As described above, in the method according to the second embodiment to the fifth embodiment, the regeneration end obtained from the wastewater-packaging-waste as the component having the smallest particle diameter among the plurality of components of the reclaimed aggregate (recycled single grain size crushed stone) used as the raw material. A small particle size component (0 to 2.5 mm) of particle size crushed stone is used.

The small particle size of the regenerated single-grained crushed stone obtained from drainage, packaging, and waste contains high viscosity, modified, and asphalt, so that the quality of the resulting asphalt mixture can be improved.

Specifically, the grip and adhesive force is enhanced, the stability of the asphalt mixture is improved, the thickness of the asphalt is thickened, the resistance to deterioration due to the influence of sunlight or air is improved, and the adhesion of asphalt to the aggregate is good. As a result, the water resistance (peel resistance) is improved, and since the softening point is higher than that of ordinary asphalt (straight asphalt), the resistance to plastic deformation is improved, and wheel marks are less likely to occur.

In addition, it is also possible to effectively use the wastewater-packing-waste waste, which was conventionally considered difficult to recycle.

On the other hand, in the second embodiment and the fifth embodiment, the smallest particle size (0 to 2.5 mm) obtained from the drainable waste packaging waste as the smallest particle diameter (0 to 2.5 mm) supplied to the dryer 8 Is used in combination with the smallest particle size (0 to 2.5 mm) obtained from asphalt pavement waste, but it is also possible to use only the smallest particle size (0 to 2.5 mm) obtained from drainage pavement waste.

In this case, the effect of preventing the adhesion of the high viscosity modified asphalt to the dryer is slightly reduced, but the effect of improving the quality of the finally obtained asphalt mixture can be obtained.

In addition, in 2nd Embodiment-5th Embodiment mentioned above, although the case where a 0-2.5 mm component was used as a small particle size component of the regeneration short-grained crushed stone obtained from the wastewater-type pavement-waste waste used as a raw material, in this invention, In the above, a 0-5 mm component and a 0-13 mm component can also be used as mentioned above.

Since the 0-5 mm component and the 0-13 mm component contain many high viscosity, modified | asphalt, and asphalt, the same effect as when using a 0-2.5 mm component can be acquired.

Next, a process (hereinafter referred to as a preceding process) for obtaining single-grained crushed stone (recycled aggregate) accommodated in each hopper 1, 2, 3, 4, 5, 6, 11, 12 will be described.

10 is a flow sheet showing the foregoing process.

First, the case where an asphalt mass is used as a raw material is demonstrated.

Raw asphalt pavement consisting of asphalt pavement waste or drainage pavement waste is supplied to the primary crushing facility 20 and crushed to a predetermined particle size or less (for example, 40 mm or less).

It is preferable to use a roll crusher as the primary crushing equipment 20.

In the case of using a roll crusher, it is possible to have a fixed quantity feed mechanism by adjusting the rotational speed of the roller.

The raw material crushed to a predetermined particle size or less by the primary crushing facility 20 is conveyed to the secondary crushing facility 22 by a conveying facility 21 such as a belt conveyor.

The secondary crushing facility 22 is for removing the oil (asphalt) adhering to the raw material surface, and a sizing machine, an impact crusher, a grinding machine, a crusher, etc. are used.

As the sizing machine, it is preferable to use Pebra's (trade name) manufactured by Earth Technica Co., Ltd., gyro parka (trade name) manufactured by Nakayama Iron Works Co., Ltd., and New Dick (trade name) manufactured by LISA Corporation.

As the impact crusher, it is preferable to use an impeller breaker, a super thunder (both trade names), and the like, manufactured by Earth Technica.

As a grinding | polishing machine, it is preferable to use the drum reclema (brand name) etc. made from Earth Technica.

As the grinding machine, it is preferable to use a double beetle (trade name) manufactured by Marue Sangisa Co., Ltd. and a supergaus (trade name) manufactured by Daito Civil Engineering Co., Ltd.

The raw material from which the oil content (asphalt) adhered to the surface by the secondary crushing facility 22 is conveyed to the sieving facility 24 by conveyance facilities 23, such as a belt conveyor.

The sieving equipment 24 is composed of three stage screens in which four kinds of screens having different sieve eyes are combined in the horizontal (or inclined) and up and down directions, and the raw material supplied from the secondary crushing equipment 22 is zero. It is classified into five kinds of particle size components (recycled aggregate) of ˜2.5 mm, 2.5-5 mm, 5-13 mm, 13-20 mm, and 20 mm or more.

In addition, by changing the number of stages of the screen of the sifter 24 and the eyes of the sieve, the particle size range to be discriminated can be appropriately changed. For example, the smallest particle size is 0-5 mm or 0-13 mm. You can discern as much as possible.

Next, the case where the cutting material of asphalt is used as a raw material is demonstrated with reference to FIG.

The cutting material to be used as a raw material is fed into a sloping lattice hopper 25 having a lattice having an inclined angle.

Since the raw material supplied to the inclined lattice hopper 25 falls more than a certain particle diameter in the hopper, only the thing of a predetermined particle diameter or less (for example, 40 mm or less) is accommodated in the hopper 25.

In addition, in this invention, instead of throwing the cutting material used as a raw material into the hopper 25 with an inclination grid | lattice, it supplies to the primary crushing equipment 20 which consists of the above-mentioned roll crusher, for example, below a fixed particle diameter (for example, 40 Mm or less).

Raw materials having a predetermined particle size or less taken out from the inclined lattice hopper 25 or the primary crushing facility 20 are supplied to the above-described secondary crushing facility 22 by a fixed amount by the quantitative supply device 26.

It is preferable to use a reciprocating feeder, a belt feeder, a vibro feeder, or the like as the metering feeder 26.

The raw material supplied to the secondary crushing facility 22 is removed by taking out the oil (asphalt) adhering to the surface and conveyed to the sieving facility 24 by the conveying facility 23, such as a belt conveyor.

The sieving facility 24 uses five types of particle size components (recycled aggregate) of 0 to 2.5 mm, 2.5 to 5 mm, 5 to 13 mm, 13 to 20 mm, and 20 mm or more of the raw material supplied from the secondary crushing facility 22. )

On the other hand, by changing the number of steps of the screen of the sieve equipment 24 and the eyes of the sieve, the particle size range to be discriminated can be appropriately changed. For example, the smallest particle size is 0-5 mm or 0-13 mm. You can discern as much as possible.

As such, the regenerated single-grained crushed stone (regenerated aggregate) obtained through the previous step shown in FIG. 10 is supplied as a raw material to the process shown in FIGS. 1 and 6 to 9 and received in a hopper to be provided for the production of the asphalt mixture. .

As described above, the recycled aggregate obtained through the above-described step shown in FIG. 10 is a crushing facility or a grinding device for crushing the asphalt mass or cutting material of the raw material consisting of asphalt pavement waste or drainage pavement waste. After supplying to any one of the polishing device for polishing by using the action, the sizing device having the sizing action, and the grinding device having the crushing action, the oil (asphalt) coated on the surface is removed and then supplied to the sieving equipment. Can be obtained by fractionally recovering a plurality of components having different particle diameters and ranges.

The recycled aggregate obtained in this way was reduced in the amount of oil adhered to the surface with oil (asphalt) attached to it, so that the oil burned in the heating step of the subsequent steps (FIGS. 1 and 6 to 9), thereby greatly reducing the particle size. It is prevented from doing so, and the compounding design for obtaining an appropriate particle size distribution becomes easy.

However, as mentioned above, also in the preceding process shown in FIG. 10, the high-viscosity modified asphalt adhered to the surface of the smallest particle size (for example, 0-2.5 mm) of drainage paving waste cannot fully be removed.

In the second to fifth aspect of the present invention, the problem is reversed. By using a component having the smallest particle size (for example, 0 to 2.5 mm) of wastewater, packaging and waste with high viscosity modified asphalt as a large amount, recycling is achieved. It is a highly effective recycling technology because it successfully uses difficult drainage pavement waste and improves the quality of the asphalt mixture.

The present invention is used to produce an asphalt mixture using recycled aggregate obtained from asphalt pavement waste or drainage pavement waste.

1 is a flow sheet showing a first embodiment of a method for producing an asphalt mixture according to the present invention.

2 is a schematic view showing the structure of a dryer, (a) is a front sectional view, and (b) is a sectional view taken along the line A-A.

3 is a schematic front sectional view showing another structure of the dryer.

4 is a schematic front sectional view showing another structure of the dryer.

5 is a schematic front sectional view showing another structure of the dryer.

6 is a flow sheet showing a second embodiment of the method for producing an asphalt mixture according to the present invention.

7 is a flow sheet showing a third embodiment of the method for producing an asphalt mixture according to the present invention.

8 is a flow sheet showing a fourth embodiment of the method for producing an asphalt mixture according to the present invention.

9 is a flow sheet showing a fifth embodiment of the method for producing an asphalt mixture according to the present invention.

10 is a flow chart showing a step (previous step) for obtaining regenerated short grain crushed stone.

11 is a flow sheet showing a conventional method for preparing an asphalt mixture from asphalt waste.

12 is a flow sheet showing another conventional method of making an asphalt mixture from asphalt waste.

* Description of the symbols for the main parts of the drawings *

1: hopper

2: hopper

3: hopper

4: hopper

5: hopper

6: hopper

8: dryer

80: rotating drum

81: heating burner

82: inner tube

83: Scrap Wings

10: Mixer

11: hopper

12: Hopper

Claims (8)

The mixing step of mixing the regenerated single-grained crushed stone by the drier and mixing the regenerated single-grained crushed stone after the heating together with the additive and the asphalt, using the regenerated single-grained crushed stone composed of a plurality of components having different particle diameters and ranges obtained from the asphalt waste. As a method of producing an asphalt mixture comprising: In the heat treatment step, a rotating drum disposed inclined so as to gradually lower from one end to the other end, a heating burner radiating flame from one end to the other end in the rotating drum, and around the flame of the heating burner. Using a dryer with an inner cylinder fitted to cover, And a part or all of the single-grained crushed stone composed of the plurality of components is fed from one end of the rotary drum of the dryer into the drum and taken out from the other end. The method of claim 1, The inner circumferential surface of the rotating drum is provided with a plurality of scrap vanes protruding at predetermined intervals in the circumferential direction, wherein the scrap blade is made of a cylindrical member extending in the drum length direction, and the cylindrical member is mounted in a state of being released from the inner circumferential surface of the drum. Method for producing an asphalt mixture, characterized in that there is. The method of claim 2, The length of the inner cylinder is a length that the flame protrudes from the tip of the inner cylinder, and at least at the position where the single-grained crushed stone enters the drum, the length of the inner cylinder covering the flame. The method according to any one of claims 1 to 3, Production of asphalt mixture, characterized in that the smallest particle size of the plurality of components of the regenerated short-grained crushed stone used as the raw material, the small particle size of the regenerated single-grained crushed stone obtained from the drainage-packaging-waste Way. The method according to any one of claims 1 to 3, The smallest particle size among the plural components of the recycled short grain size crushed stone used as the raw material, the small particle size component of the recycled single grain size crushed stone obtained from the drainage waste pavement waste, and the small particle size component of the recycled single grain size crushed stone obtained from the asphalt pavement waste. Method for producing an asphalt mixture, characterized in that using a mixture of. The method according to any one of claims 1 to 3, In the mixing step, a small particle size component of the regenerated single grain size crushed stone obtained from the wastewater & packaging & waste is mixed at room temperature. The method according to any one of claims 1 to 3, In the mixing step, a mixture of the small particle size component of the recycled short grain size crushed stone obtained from the wastewater " package " waste and the small particle size component of the recycled single grain size crushed stone obtained from the asphalt pavement waste is mixed at room temperature. Manufacturing method. The method according to any one of claims 1 to 3, The smallest particle size among the plural components of the recycled short grain size crushed stone used as the raw material, and the small particle size component of the recycled single grain size crushed stone obtained from the drainage waste pavement waste and the small particle size component of the recycled single grain size crushed stone obtained from the asphalt pavement waste Using a mixture of In the mixing step, a mixture of the small particle size component of the recycled short grain size crushed stone obtained from the wastewater " package " waste and the small particle size component of the recycled single grain size crushed stone obtained from the asphalt pavement waste is mixed at room temperature. Manufacturing method.

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