JP2011117270A - Manufacturing method of asphalt mixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture an asphalt mixture which is excellent in quality and workability, and which can inhibit asphalt from adhering to an inner wall of a dryer while preventing degradation and generation of an offensive odor due to combustion of the asphalt, in a method of manufacturing the asphalt mixture using asphalt wastes as raw material. <P>SOLUTION: The method of manufacturing the asphalt mixture uses regenerated single-grain-sized crushed stones as the raw material consisting of a plurality of components of different grain sizes which are obtained from the asphalt wastes. The method includes: a heating step wherein the regenerated single-grain-sized crushed stones consisting of the plurality of components of the different grain sizes are heated by a drier; and a mixing step wherein the regenerated single-grain-sized crushed stones heated by the drier are mixed with additives and the asphalt. The regenerated single-grain-sized crushed stones are processed to remove oil films around the surfaces thereof. In the mixing step, the component of the minimum grain size out of the plurality of components of the regenerated single-grain-sized crushed stones used as the raw material is heated by an indirect heating device, which is different from the drier, and is supplied to a mixing device to be mixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing an asphalt mixture, and more particularly to a method capable of producing an asphalt mixture having high quality and excellent workability using asphalt waste as a raw material.

In recent years, a part of asphalt pavement waste material generated by repairing asphalt pavement roads, etc. is reused as a raw material for asphalt mixture (asphalt mixture).
Many methods have already been proposed for producing asphalt composites from asphalt waste as a raw material (for example, see Patent Documents 1 and 2 below).

  However, recycled asphalt composites manufactured using asphalt waste as a raw material are due to the fact that the asphalt (oil) coating is attached to the surface of the recycled aggregate that is the raw material, the oil deteriorates due to heating, etc. There was a problem that the quality was inferior compared to ordinary asphalt composites.

On the other hand, drainage paved roads that have been spreading rapidly in recent years will require large-scale repairs in the future, and a large amount of waste material is expected to be discharged.
However, since drainage pavement uses high-viscosity modified asphalt to bond aggregates with gaps, when producing recycled aggregate from drainage pavement waste, There arises a problem that the high viscosity modified asphalt adhering to the surface of the material cannot be sufficiently removed.
In particular, since it is extremely difficult to remove high-viscosity modified asphalt adhering to small-diameter components, a large amount of adhering to small-diameter components is used when recycled aggregate obtained from drainage pavement waste is used in the production of asphalt composites. High-viscosity modified asphalt may adhere to the dryer inner wall in the heating process, or may cause problems such as deterioration due to combustion or odor generation, which makes it difficult to reuse drainage pavement waste It was.

In view of the above situation, the applicant of the present application has proposed the technology disclosed in Patent Document 3 below.
The disclosed technology of Patent Document 3 uses, as a raw material, a small-diameter component of recycled single-grain crushed stone obtained from drainage pavement waste in addition to recycled single-grain crushed stone (recycled aggregate) obtained from ordinary asphalt pavement waste. Is an excellent technology that makes it possible to produce high-quality asphalt composites equivalent to ordinary asphalt composites.

However, the technique disclosed in Patent Document 3 also has a problem to be solved.
In the disclosed technology of Patent Document 3, in order to prevent high viscosity modified asphalt from adhering to the inner wall of the dryer, a small diameter component (0 to 2.5 mm) of recycled aggregate obtained from drainage pavement waste material is used at room temperature. When it supplied to the mixing apparatus (refer FIGS. 2-4 of patent document 3), there existed a problem that the temperature of asphalt compound material fell, fluidity | liquidity worsened, and the workability on the spot fell significantly.

The applicant of the present application is conducting an experiment on temperature reduction due to normal temperature mixing of the aggregate.
The experiment was conducted on the assumption that a dense-graded asphalt mixture was produced by blending in accordance with the standards of the asphalt pavement outline (the blending amount adopted the median of the standard particle size range). And the temperature fall at the time of mixing 10% of the aggregate (recycled single grain crushed stone) of the component (0-2.5 mm) with the smallest particle diameter at normal temperature was measured.
Details of the formulation are shown in Table 1.

After mixing the ingredients in the three particle size ranges for heating shown in Table 1 (5-13mm (RS-13), 2.5-5mm (RS-5), 0-2.5mm) and heating to 200 ° C, 0-2.5 mm for room temperature mixing was added and mixed at room temperature, and the temperature was measured.
As a result, the temperature of the aggregate that had been heated to 200 ° C. decreased to 147.4 ° C. In other words, the temperature dropped to 73.7%. From this result, after mixing 0% to 2.5mm aggregate at room temperature 10%, the heating temperature necessary to obtain the aggregate temperature (160 ° C) required for the production of the dense asphalt mixture is calculated back to 160 ° C / 0.737 = 217 ° C. That is, it is necessary to overheat the aggregate to 217 ° C. in advance in order to compensate for the temperature drop due to normal temperature mixing.

However, excessive heating of the aggregate exceeding this temperature (217 ° C.) is difficult in view of the capability and economics of the heating dryer. From this, it can be said that the upper limit is about 10% of the aggregate to be mixed at room temperature.
In addition, when using aggregate of normal temperature to aggregate heated with a dryer, compared to the case of using 100% of aggregate heated with a dryer (when the aggregate of normal temperature is not mixed), Even if the temperature of the asphalt composite at the time of shipment from the factory is the same, the temperature drop until the arrival at the site increases, and the workability at the site deteriorates. Also from this, it is not preferable that the ratio of the aggregate mixed at room temperature is large, and it is considered that the upper limit is about 10%.

  From the above, in the disclosed technique of Patent Document 3, the ratio of the small diameter component of the recycled aggregate that can be mixed at room temperature is about 10% at the maximum. Therefore, the remaining small-diameter components must be supplied to the dryer and heated, and it has not been easy to solve the problems of asphalt adhesion and odor on the inner wall of the dryer.

  In addition, the problem of workability deterioration due to the above-mentioned temperature drop due to normal temperature mixing is not only caused by mixing recycled aggregate obtained from drainage pavement waste at room temperature, but also recycled aggregate obtained from asphalt pavement waste at room temperature. This also occurs when mixed.

Japanese Patent Laid-Open No. 7-197412 JP 2002-129514 A JP 2009-102883 A

  The present invention has been made to solve the above-mentioned problems of the prior art, and in the method for producing asphalt mixture using asphalt waste as a raw material, the asphalt adheres to the inner wall of the dryer or deteriorates due to asphalt combustion. The present invention provides a method for producing an asphalt mixture that can suppress the generation of odor and bad odor, and that can produce a high-quality and excellent workability asphalt mixture.

  The invention according to claim 1 is based on regenerated single-grain crushed stone made of a plurality of components having different particle size ranges obtained from asphalt waste material, and the regenerated single-grain crushed stone made of a plurality of components having different particle size ranges is obtained using a dryer. A method for producing an asphalt mixture comprising a heating step of heating and a mixing step of mixing the recycled single-grain crushed stone heated by the dryer together with an additive and asphalt, wherein the recycled single-grain crushed stone is coated on the surface In the heating process of the indirect heating type different from the dryer, the component having the smallest particle size among the plurality of components of the regenerated single-grain crushed stone used as a raw material in the mixing step It is related with the manufacturing method of the asphalt compound material characterized by supplying and mixing to the said mixing apparatus after heating with an apparatus.

  The invention which concerns on Claim 2 uses the small diameter component of the reproduction | regeneration single particle size crushed stone obtained from the drainage pavement waste material as a component of the smallest particle diameter among several components of the reproduction | regeneration single particle size crushed stone used as the said raw material. The present invention relates to a method for producing an asphalt mixture according to claim 1.

  The invention which concerns on Claim 3 uses the small diameter component of the reproduction | regeneration single particle size crushed stone obtained from the asphalt pavement waste material as a component of the smallest particle size among several components of the reproduction | regeneration single particle size crushed stone used as the said raw material. The method for producing an asphalt mixture according to claim 1.

  The invention according to claim 4 includes a small-diameter component of recycled single-grain crushed stone obtained from drainage pavement waste as an ingredient having the smallest particle size among a plurality of components of the recycled single-grain crushed stone used as the raw material, asphalt 2. The method for producing an asphalt mixture according to claim 1, wherein a mixture of small diameter components of recycled single-grain crushed stone obtained from paving waste is used.

  According to a fifth aspect of the present invention, there is provided a method for producing an asphalt mixture according to the fourth aspect, wherein the heating device is provided with a stirring means, and the mixture is heated while being stirred by the stirring means.

  According to a sixth aspect of the present invention, in the heating step, the rotating drum is disposed so as to be gradually lowered from one end portion toward the other end portion, and the other end portion from the one end portion in the rotating drum. An asphalt according to any one of claims 1 to 5, characterized by using a dryer comprising a heating burner that radiates a flame toward the flame, and an inner cylinder mounted so as to cover the periphery of the flame of the heating burner. The present invention relates to a method for producing a composite material.

  The invention according to claim 7 uses, as a raw material, a new single-grain crushed stone composed of a plurality of components having different particle size ranges obtained from a new aggregate in addition to the regenerated single-grain crushed stone, and is used in the heating step. The dryer is a direct heating dryer and an indirect heating dryer, the new single-grain crushed stone is heated by the direct-heating dryer, and the component having the smallest particle size among the plurality of components of the regenerated single-grain crushed stone The method for producing an asphalt mixture according to any one of claims 1 to 5, wherein the remaining component is heated by the indirect heating dryer.

  The invention according to claim 8 supplies the regenerated single-grain crushed stone component heated by the indirect heating dryer and the new single-grain crushed stone component heated by the direct heating dryer to a screen, The components supplied on the screen are classified for each particle size, the components classified for each particle size are supplied to a weighing device, the respective components are measured, and the respective components are converted into measurement results by the weighing device. 8. The method for producing an asphalt mixture according to claim 7, wherein the mixture is mixed at a predetermined ratio and supplied to the mixing device.

According to the invention which concerns on Claim 1, in a mixing process, the component of the smallest particle diameter is heated with the indirect heating type heating apparatus different from a drier among several components of the reproduction | regeneration single particle size crushed stone used as a raw material. Then, by supplying to the mixing device and mixing, the temperature drop of the asphalt mixture due to mixing is suppressed, fluidity is maintained, and workability on site is greatly improved.
Further, by using an indirect heating type heating device, combustion / deterioration of oil due to heating by the heating device is prevented. Furthermore, it becomes possible to reduce or eliminate the supply of recycled single-grain crushed stone with the smallest particle size component to the dryer, and asphalt adheres to the dryer in the heating process, burning and deterioration of asphalt, and generation of malodor. It is suppressed.
In addition, since the oil coated on the surface of the reclaimed single-size crushed stone has been removed (through the process for removing the oil), the particle size of the regenerated single-size crushed stone has changed (decreased) due to the combustion of the oil in the heating process. ) And the blending design for obtaining an appropriate particle size distribution is facilitated.

  According to the invention which concerns on Claim 2, the small diameter component of the reproduction | regeneration single particle size crushed stone obtained from the drainage pavement waste material is used as a component of the smallest particle size among several components of the reproduction | regeneration single particle size crushed stone used as a raw material. As a result, high-viscosity modified asphalt that is abundant in the small-diameter component of recycled single-grain crushed stone obtained from drainage pavement waste contributes greatly to the quality improvement of the finally obtained asphalt mixture. It becomes possible to produce a high-quality asphalt composite material equivalent to the asphalt composite material.

  According to the invention which concerns on Claim 3, the small diameter component of the reproduction | regeneration single particle size crushed stone obtained from the asphalt pavement waste material is used as a component of the smallest particle size among several components of the reproduction | regeneration single particle size crushed stone used as a raw material. As a result, the heating temperature in the heating process can be lower than in the case of using drainage pavement waste, and asphalt adherence to the dryer inner wall and generation of malodor can be reduced.

  According to the invention according to claim 4, as the component of the smallest particle size among the plurality of components of the regenerated single particle crushed stone used as a raw material, the small diameter component of the regenerated single particle crushed stone obtained from the drainage pavement waste material, By using a mixture of small-sized components of recycled single-size crushed stone obtained from asphalt pavement waste, the quality of the asphalt mixture finally obtained is improved while reducing asphalt adhesion and foul odor generation on the dryer inner wall. Can be made.

  According to the invention which concerns on Claim 5, the heating means is equipped with the stirring means, The small diameter component of the reproduction | regeneration single particle size crushed stone obtained from drainage pavement waste material, and the reproduction | regeneration single particle size crushed stone obtained from the asphalt pavement waste material By heating the mixture of small-diameter components while stirring with a stirring means, both small-diameter components are uniformly mixed in the heating device. Therefore, the high-viscosity modified asphalt is uniformly mixed in the mixing step, and the quality of the obtained asphalt mixture can be improved.

  According to the invention of claim 6, in the heating step, the rotating drum is disposed so as to be gradually lowered from one end to the other end, and the one end to the other end in the rotating drum. High-viscosity modified asphalt adheres to the dryer in the heating process by using a dryer equipped with a heating burner that radiates a flame toward the part and an inner cylinder that is mounted to cover the periphery of the flame of the heating burner Can be suppressed.

  According to the invention according to claim 7, in addition to the regenerated single particle crushed stone, a new single particle crushed stone made of a plurality of components having different particle size ranges obtained from a new aggregate is used as a raw material, and used in the heating step. The dryer to be used consists of a direct heating dryer and an indirect heating dryer, and the new single-grain crushed stone is heated by the direct-heating dryer, and the component with the smallest particle size among the multiple components of the regenerated single-grain crushed stone is the heating device. By heating the remaining components with an indirect heating dryer, the regenerated single-size crushed stone is not heated excessively, and the deterioration of the oil adhering to the regenerated single-size crushed stone and the generation of malodors Can be suppressed. Moreover, since the new single-grain crushed stone is used, the quality of the obtained asphalt mixture can be improved.

  According to the invention which concerns on Claim 8, the component of the reproduction | regeneration single particle size crushed stone heated with the indirect heating type dryer is not supplied to a mixing apparatus directly with the component of the new single particle size crushed stone heated with the direct heating type dryer. After being separated by particle size by the screen, the components separated by particle size are supplied to the weighing device and each component is weighed, and each component is based on the measurement result by the weighing device. Therefore, the mixture is blended at a predetermined ratio and supplied to the mixing device, so that blending with high accuracy (blending according to an appropriate particle size distribution) is possible, and the quality of the obtained asphalt mixture can be further improved.

It is a flow sheet which shows 1st embodiment of the manufacturing method of the asphalt compound material which concerns on this invention. It is a flow sheet which shows a second embodiment of the manufacturing method of asphalt compound material concerning the present invention. It is a flow sheet which shows 3rd embodiment of the manufacturing method of the asphalt compound material which concerns on this invention. It is a flow sheet which shows 4th embodiment of the manufacturing method of asphalt compound material concerning the present invention. It is the schematic which shows the structure of a dryer, Comprising: (a) is front sectional drawing, (b) is an AA sectional view. It is a schematic front sectional drawing which shows another structure of a dryer. It is a schematic front sectional drawing which shows another structure of a dryer. It is a schematic front sectional drawing which shows another structure of a dryer. It is a schematic sectional drawing which shows the structure of an indirect heating type heating apparatus. It is a flowchart which shows the process (pre-process) for obtaining the reproduction | regeneration single particle size crushed stone.

FIG. 1 is a flow sheet showing a first embodiment of a method for producing an asphalt mixture according to the present invention.
Hereinafter, in describing the manufacturing method of the first embodiment, a manufacturing apparatus for carrying out the manufacturing method of the first embodiment described in the flow sheet will be described first.

In the present invention, the term “asphalt waste material” means both waste material obtained from ordinary asphalt pavement (waste material of dense-graded asphalt mixture) and waste material obtained from drainage pavement (waste material of drainage pavement mixture). The term “asphalt pavement waste” is used to mean only the former, and the term “drainage pavement waste” is used to mean only the latter. .
In addition, the term “asphalt” is used to include both straight asphalt used for ordinary asphalt pavement and high viscosity modified asphalt used for drainage pavement. The term “straight asphalt” is used, and when only the latter is meant, the term “high viscosity modified asphalt” is used.
In addition, the “small-size component” of recycled single-grain crushed stone obtained from asphalt waste refers to the component with the smallest particle size among the recycled single-grain crushed stone obtained from asphalt waste. Varies by A component having a particle size of 0 to 2.5 mm is preferably used, but a component having a particle size of 0 to 5 mm, a component having a particle size of 0 to 13 mm, or a component having another particle size range may be used.

  The manufacturing apparatus includes a plurality of hoppers (1), (2), (3), each containing reclaimed single-grain crushed stones (hereinafter referred to as reclaimed aggregates) composed of a plurality of components having different particle diameter ranges obtained from asphalt waste. 4) (5) (6) (11) (12) (51) (52), supply device (7) for supplying the components taken out from each hopper to the conveying device, and incorporating recycled aggregate A dryer (8) for heating, an indirect heating type heating device (40) for taking in and heating recycled aggregate, and a mixing device (10) for mixing the components heated by the dryer (8) with asphalt or the like; A conveying device (9) for conveying each component supplied by the supplying device (7) to the dryer (8), the heating device (40) or the mixing device (10) is provided.

  Of the hoppers (1), (2), (3), (4), (5), (6), (11), (12), (51), and (52), the hoppers (1), (2), (3), (4), and (5) (6) contains recycled aggregate to be supplied to the dryer (8), and hoppers (11) and (12) contain recycled aggregate to be supplied to the heating device (40). ) (52) contains recycled aggregate which is fed directly to the mixing device (10).

The supply device (7) is installed near the outlet of each hopper (1) (2) (3) (4) (5) (6) (11) (12) (51) (52), It consists of a conveyor with a belt scale comprised from the belt conveyor (7a) and the belt scale (7b) attached to this belt conveyor.
The conveyor with a belt scale is a device that can continuously measure the weight of the object to be conveyed by the belt conveyor (7a) in real time by the belt scale (7b), for example, a load attached to the conveyor. It comprises a detection device (such as a load cell) and a speed detection device, and a control device that calculates the transport weight based on the measurement data of these devices.

When the calculated transport amount exceeds a preset transport amount target value or does not reach the target value, the control device feeds recycled aggregate from the hopper to the belt conveyor (7a) (not shown). ), When the feeder is a belt feeder, the belt rotation speed is changed, and when the feeder is a vibration feeder, the frequency is changed to perform feedback control.
Thereby, the regenerated aggregate of each particle size range taken out from each hopper (1) (2) (3) (4) (5) (6) (11) (12) (51) (52) While being controlled so that the hit supply amount always becomes a preset target value, the supply amount is supplied to the transport device (9).

  The transport device (9) is a device for transporting each component supplied by the supply device (7) to the dryer (8), the heating device (40) or the mixing device (10), for example, from a belt conveyor. Composed.

The dryer (8) takes in and heats the components conveyed by the conveying device (9) from the hoppers (1), (2), (3), (4), (5), and (6).
FIG. 5 is a schematic view showing the structure of the dryer (8), where (a) is a front sectional view and (b) is a sectional view taken along line AA. In addition, the arrow in a figure has shown the flow direction of the aggregate.
The dryer (8) includes a rotating drum (80) disposed so as to be gradually lowered from one end (inlet side) to the other end (outlet side), and in the rotating drum (80). , A heating burner (81) that radiates a flame from one end to the other end, and an inner cylinder (82) mounted to cover the periphery of the flame of the heating burner (81).

  The inner cylinder (82) is a cylindrical member made of heat-resistant steel or the like, and the diameter of the inner cylinder (82) is about ½ of the inner diameter of the rotating drum (80). 80) from one end to about 1/5 to 1/3 of the drum length.

Thus, the inner cylinder (82) covers the flame around the heating burner (81), so that the aggregate supplied into the drum from one end of the rotating drum (80) does not directly contact the flame, It is heated by hot air, radiant heat from the peripheral surface of the inner cylinder, and radiant heat from the flame.
Therefore, increase the temperature of the aggregate to the optimum temperature for the mixing process while preventing the burning and deterioration of the oil (asphalt) adhering to the surface of the recycled aggregate, and further preventing the asphalt from adhering to the inner peripheral surface of the drum. Is possible.

On the inner peripheral surface of the rotating drum (80), a plurality of scraping blades (83) are projected in the circumferential direction at predetermined intervals.
The scraping blade (83) is formed of a cylindrical member extending in the length direction of the rotating drum (80), and is attached in a state of being floated from the inner peripheral surface of the drum.
More specifically, the cylindrical member is made of a metal pipe, and each pipe is fixed to the inner peripheral surface of the drum (80) via the plate (84) only at both ends. As a result, the pipe floats from the drum inner circumferential surface by the height of the plate (84) (about 50 to 100 mm).

  When the scraping blade (83) is a cylindrical member, the aggregate slips along the surface of the scraping blade, so that the oil does not easily adhere. Further, since the lifting blade (83) is in a state of floating from the inner peripheral surface of the drum, a space is secured between the inner peripheral surface of the rotating drum (80) and the lifting blade (83), and the regeneration is performed. Since the aggregate can flow through this space, it is possible to prevent asphalt from adhering to the surface of the scraping blade (83).

Further, the scraping blade (83) is not provided in the vicinity of one end portion in the length direction of the rotating drum (80), and is provided so as to extend over a range from the vicinity of the intermediate portion to the vicinity of the other end portion. ing.
As a result, the aggregate supplied from the one end side of the rotating drum (80) is heated gently without being stirred in the temperature range (about 60 to 100 ° C.) where it is most likely to adhere, and is easily attached. After being heated as described above and flowing along the inclination, it can be stirred and the asphalt can be more effectively prevented from adhering to the raising blade (83).

  In addition, in the vicinity of one end portion of the inner peripheral surface of the rotating drum (80), the aggregate supplied into the drum from the supply port (85) provided on one end portion side of the rotating drum (80) is transferred to the drum. It is preferable to project a spiral feed blade (not shown) for feeding to the vicinity of the intermediate portion.

6 and 7 are schematic front sectional views showing another structure of the dryer (8).
These dryers (8) are obtained by increasing the area of the tip opening (82a) by obliquely cutting off the tip of the inner cylinder (82).
By providing such a tip opening, it becomes possible to apply the radiant heat of the flame to the aggregate from the tip opening, and the heating efficiency can be increased.
6 shows the tip opening (82a) formed on the lower surface side, and FIG. 7 shows the tip opening (82a) formed on the side surface.
As described above, it is preferable to form the tip opening (82a) on the lower surface side or the side surface side because it is possible to prevent the accumulation of aggregate in the inner cylinder (82).

Further, in the present invention, the inner cylinder (82) as shown in FIG. 5 is replaced with an inner cylinder (82) as shown in FIG. 8 instead of the one covering the substantially entire periphery of the flame of the heating burner (81). It is possible to use a dryer (8) shortened so as to cover only a part of the periphery of the flame of the heating burner (81).
In this case, the length of the inner cylinder (82) is such a length that the flame protrudes from the tip of the inner cylinder (82), and at least at a position where the aggregate enters the drum, the inner cylinder (82) covers the flame. Is done. Specifically, it is preferable to set the length from one end of the rotating drum (80) to about 1/6 to 1/10 of the drum length.
When the length of the inner cylinder (82) is shortened in this way, 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 remarkably increased, and the heating efficiency of the aggregate is increased. The temperature of the aggregate can be significantly improved, and the temperature of the aggregate can be increased to a temperature optimum for the mixing process more reliably and in a short time. In addition, by covering the flame around the position where the aggregate enters the drum, it is possible to prevent combustion and deterioration of the oil adhering to the aggregate surface and adhesion of the oil to the drum inner peripheral surface.

A cyclone (13), a blower (14), a deodorizing furnace (15), and a chimney (16) for purifying the exhaust gas are connected to an exhaust gas discharge port from the dryer (8).
Among these, the deodorizing furnace (15) deodorizes by burning the odor component generated by heating the asphalt attached to the surface of the recycled aggregate.

The mixing device (10) is a stone powder tank containing components extracted from the dryer (8), components extracted from the heating device (40), and components extracted from the hoppers (51) and (52) as necessary. It mixes with the stone powder supplied from (17), the additive supplied from the additive tank (18), and the asphalt supplied from the asphalt tank (19), thereby producing an asphalt mixture.
Moreover, the trolley bucket (30) is arrange | positioned under the mixing apparatus (10), and the produced | generated asphalt compound material is conveyed by this trolley bucket (30) to the silo (31) for storage.

The heating device (40) indirectly heats the components taken out from the hoppers (11) and (12) and transported by the transport device (9).
FIG. 9 is a schematic cross-sectional view showing the configuration of the heating device (40).
The heating device (40) includes a storage tank (41) for storing components taken out from the hoppers (11) and (12) and transported by the transport device (9), and a vertical direction inside the storage tank (41). A rotating shaft (42) arranged to extend and rotated by driving of a hydraulic motor, a stirring blade (43) radially attached to the rotating shaft (42), and a gas for heating the bottom of the storage tank (41) A heating means (44) such as a burner and a temperature sensor (not shown) for measuring the temperature inside the storage tank (41) are provided.

The heating device (40) may be a stationary type as shown in FIG. 9 or an in-vehicle type mounted on a truck chassis. In the case of a vehicle-mounted type, the hydraulic motor that drives the rotating shaft (42) may be driven by a hydraulic pump connected to the PTO shaft of the traveling engine.
Further, the storage tank (41) may be a vertical type as shown or a horizontal type (not shown). In the case of the horizontal type, the rotation shaft (42) may be disposed so as to extend in the horizontal direction.

The heating device (40) may be an indirect heating type that does not directly hit the object to be heated and includes a stirring means, and its structure is not particularly limited.
For example, a heating unit (such as an electric heater) that heats a conveyance unit (screw built-in unit) in a screw feeder or screw conveyor from the outside may be provided.

Hereinafter, 1st embodiment of the manufacturing method of the asphalt compound material which concerns on this invention is described based on the flow sheet of FIG.
First, recycled aggregates made from asphalt pavement waste and made from multiple components with different particle size ranges (13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, and 0 to 2.5 mm, 4 components), 1) Housed in (2) (3) (4). Moreover, the small diameter component (0-2.5 mm) of the recycled aggregate obtained from the asphalt pavement waste material is also accommodated in the hoppers (11) (51). Furthermore, the small diameter component (0-2.5 mm) of the recycled aggregate obtained from drainage pavement waste material is accommodated in the hopper (5) (12) (52).

  The remaining hopper (6) is used as a spare hopper, and if necessary, recycled aggregate obtained from asphalt pavement waste or drainage pavement waste or new aggregate is accommodated for use.

  The recycled aggregate stored in the hoppers (1), (2), (3), (4), (5), (11), (12), (51), and (52) is a supply device (7) comprising the conveyor with the belt scale described above. Are selectively taken out and supplied to the conveying device (9). The supply device (7) performs control so that the supply amount per unit time of the aggregate having different particle diameter ranges that is selectively taken out from each hopper becomes a preset target value.

The recycled aggregate taken out from the hoppers (1), (2), (3), (4), and (5) is supplied to the dryer (8) by the transport device (9).
Here, the small diameter component (0-2.5mm) of the regenerated aggregate obtained from the asphalt pavement waste housed in the hopper (4) and the regenerated bone obtained from the drainage pavement waste housed in the hopper (5) One or both of the small diameter components (0 to 2.5 mm) of the material are taken out and supplied to the dryer (8).

When the small diameter component (0-2.5mm) of recycled aggregate obtained from drainage pavement waste housed in the hopper (5) is supplied to the dryer (8), it adheres to the aggregate surface during the heating process with the dryer. There is a problem that the high-viscosity modified asphalt easily adheres to the inner wall of the dryer.
This is because the drainage pavement waste material contains high-viscosity modified asphalt having a higher viscosity than ordinary straight asphalt. The small-diameter component (0 to 2.5 mm) contains a relatively large amount of high-viscosity modified asphalt because asphalt attached to the surface is not sufficiently removed in the pre-process described later.
However, if the small diameter component (0 ~ 2.5mm) obtained from drainage pavement waste is mixed with the small diameter component (0 ~ 2.5mm) obtained from asphalt pavement waste, this problem will be solved. Can be solved.

The aggregate conveyed by the conveying device (9) is supplied into the drum from a supply port (85) provided at one end of the rotary drum (80), and the rotation and inclination of the rotary drum (80). Is moved out of the drum and taken out from the other end.
As described above, the aggregate supplied into the rotary drum (80) is heated by hot air, radiant heat, and radiant heat without directly touching the flame. The asphalt is heated to a temperature (for example, about 160 to 210 ° C., preferably about 160 to 180 ° C.) optimum for the mixing step without burning or deterioration of the asphalt and adhesion of the asphalt to the inner peripheral surface of the drum.
In addition, since the scraping blade (83) is a cylindrical member and is mounted in a state of being lifted from the drum inner peripheral surface, the asphalt adhesion to the scraping blade and the drum inner peripheral surface is greatly suppressed. Can do.

The small diameter component (0 to 2.5 mm) of the recycled aggregate taken out from the hoppers (11) and (12) is sent to the indirect heating type heating device (40) by the transport device (9).
Here, the small diameter component (0-2.5 mm) of the regenerated aggregate obtained from the asphalt pavement waste housed in the hopper (11) and the regenerated bone obtained from the drainage pavement waste housed in the hopper (12) One or both of the small diameter components (0 to 2.5 mm) of the material are taken out and supplied to the heating device (40).

In the heating device (40), the regenerated aggregate sent is accommodated in the storage tank (41), and the regenerated aggregate is agitated by the stirring blade (43) by the rotation of the rotating shaft (42), and heating means is used. The bottom of the storage tank (41) is heated by (44).
Here, the small diameter component (0 to 2.5 mm) of the recycled aggregate supplied from the hoppers (11) and (12) has a lot of asphalt attached, but the heating device (40) is an indirect heating type, It is suppressed that the asphalt adhering to the recycled aggregate is burnt and deteriorates or a bad odor is generated.
The heating temperature of the recycled aggregate stored in the storage tank (41) is set lower than the heating temperature by the dryer (8). Thereby, combustion and deterioration of oil do not occur.

The recycled aggregate heated by the dryer (8) is supplied to the mixing device (10) together with the small diameter component (0 to 2.5 mm) of the recycled aggregate heated by the heating device (40).
Here, in addition to the regenerated aggregate heated by the dryer (8) and the small diameter component (0 to 2.5 mm) of the regenerated aggregate heated by the heating device (40), the regenerated aggregate at room temperature is mixed ( 10). Recycled aggregates at room temperature include small diameter components (0-2.5mm) of recycled aggregate obtained from asphalt pavement waste housed in hopper (51) and drainage pavement waste housed in hopper (52). Either one or both of the small diameter components (0 to 2.5 mm) of the obtained recycled aggregate are used.

The recycled aggregate supplied to the mixing device (10) is 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). Is done. Thereby, the asphalt mixture which is the final product in the present invention is obtained. The obtained asphalt mixture is supplied to the silo (31) by the trolley bucket (30) and stored.

In the method of the first embodiment, in the mixing step, the small diameter component (0 to 2.5 mm) of the recycled aggregate is heated by the indirect heating type heating device (40) different from the dryer (8), and then the mixing device ( By supplying to 10) and mixing, the temperature fall of asphalt compound material is suppressed, fluidity | liquidity is maintained, and the construction property on the spot improves.
In addition, the small diameter component (0 to 2.5 mm) of the regenerated aggregate is heated by the heating device (40), thereby reducing the supply amount of the regenerated aggregate small diameter component (0 to 2.5 mm) to the dryer (8). Or it can be eliminated. As a result, the asphalt is prevented from adhering to the inner wall of the dryer, and the combustion and deterioration of the asphalt and the generation of malodor are suppressed.
In addition, by using the dryer (8) having a structure capable of high-temperature heating in the heating process, even if the heating temperature by the heating device (40) is lowered, the reduction of the finished temperature due to the mixing can be reduced. It becomes possible to make up for it by overheating, and it becomes possible to set it to an appropriate finish temperature that is easy to construct.

Further, by using the indirect heating type heating device (40), combustion / deterioration of oil due to heating by the heating device (40) is prevented.
Furthermore, since the heating device (40) is provided with a stirring means, the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the drainage pavement waste and the recycled aggregate obtained from the asphalt pavement waste. When the small diameter component (0 to 2.5 mm) is supplied to the heating device (40), both these components are uniformly mixed by the stirring means.
Thereby, it becomes possible to mix the high-viscosity modified asphalt without unevenness in the mixing step, and the quality of the obtained asphalt mixture can be improved.

Furthermore, the quality of the asphalt mixture finally obtained can be improved by using the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the drainage pavement waste material. This is because the small-diameter component of recycled single-grain crushed stone obtained from drainage pavement waste contains a large amount of high-viscosity modified asphalt.
Specifically, the stability of the asphalt mixture is improved by increasing the gripping force and adhesive force, and the resistance to deterioration due to the influence of sunlight, air, etc. is improved by increasing the film thickness of the asphalt, Asphalt adherence to the material improves water resistance (peeling resistance), and since it has a higher softening point than ordinary asphalt (straight asphalt), resistance to plastic deformation is improved and rubbing is less likely to occur Become.
Moreover, the drainage pavement waste material considered conventionally difficult to reuse can also be used effectively.

FIG. 2 is a flow sheet showing a second embodiment of the method for producing an asphalt mixture according to the present invention.
Hereinafter, in describing the manufacturing method of the second embodiment, first, a manufacturing apparatus for carrying out the manufacturing method of the second embodiment described in the flow sheet will be described.

  The manufacturing apparatus includes a plurality of hoppers (61), (62), (63), (64), (65), and (66) that respectively accommodate new aggregates (new single-grain crushed stones) composed of a plurality of components having different particle size ranges; A plurality of hoppers (67), (68), and (69) each containing a regenerated aggregate composed of a plurality of components having different particle diameter ranges obtained from asphalt waste materials, and the components taken out from each hopper are supplied to the conveying device Supply device (7), a direct heating dryer (71) that takes in and heats new aggregate, an indirect heating dryer (72) that takes in and heats recycled aggregate, and also uses recycled aggregate Indirect heating type heating device (40) for heating, mixing device (10) for mixing components heated by direct heating type dryer (71), indirect heating type dryer (72) and heating device (40) with asphalt or the like The conveying device (9) for conveying each component supplied by the supplying device (7) to the direct heating dryer (71), the indirect heating dryer (72), the heating device (40) or the mixing device (10). I have.

  Of the hopper (61) (62) (63) (64) (65) (66) (67) (68) (69), the hopper (61) (62) (63) (64) (65) (66) Contains new aggregate to be supplied directly to the heated dryer (71), and hoppers (67) and (68) contain recycled aggregate to be supplied to the indirectly heated dryer (72). (69) contains recycled aggregate to be supplied to the heating device (40).

The supply device (7) has the same configuration as that of the first embodiment.
New aggregate or regenerated bone of each particle size range taken out from each hopper (61) (62) (63) (64) (65) (66) (67) (68) (69) by the supply device (7) The material is supplied to the transport device (9) while being controlled such that the supply amount per unit time always becomes a preset target value.

  The conveyance device (9) conveys each component supplied by the supply device (7) to the direct heating dryer (71), the indirect heating dryer (72), the heating device (40), or the mixing device (10). For example, a belt conveyor.

  The direct heating dryer (71) takes in the new aggregate conveyed by the conveying device (9) from the hopper (61) (62) (63) (64) (65) (66) into the interior, It is of a known structure that is heated directly by a flame.

The indirectly heated dryer (72) has a known structure in which regenerated aggregate conveyed from the hoppers (67) and (68) by the conveying device (9) is taken into the inside and indirectly heated.
The indirect heating dryer (72) has a structure in which a combustion device equipped with a burner and a drying unit are separately provided and connected by a connecting pipe, and the components supplied into the drying unit are directly generated by the flame of the burner. Without being heated, it is indirectly heated by hot air introduced from the combustion device through the connecting pipe into the drying section.

  At the exhaust gas discharge port from the direct heating dryer (71) and the indirect heating dryer (72), a cyclone (13) for cleaning the exhaust gas, a blower (14), a bag filter (70), a chimney (16) are connected.

  The hot screen (73) classifies the recycled aggregate after heating supplied from the direct heating dryer (71), and supplies it to the weighing device (74) equipped with a hot bottle.

The mixing device (10) comprises a component extracted from the metering device (74), a component extracted from the indirect heating dryer (72), and a component extracted from the heating device (40) into a stone powder tank (17). Is mixed with the stone powder supplied from the additive, the additive supplied from the additive tank (18), and the asphalt supplied from the asphalt tank (19), thereby producing an asphalt mixture.
Moreover, the trolley bucket (30) is arrange | positioned under the mixing apparatus (10), and the produced | generated asphalt compound material is conveyed by this trolley bucket (30) to the silo (31) for storage.

The heating device (40) has the same configuration as in the first embodiment.
The heating device (40) indirectly heats the components taken out from the hopper (69) and transported by the transport device (9).

Hereinafter, 2nd embodiment of the manufacturing method of the asphalt compound material which concerns on this invention is described based on the flow sheet of FIG.
First, new aggregates composed of a plurality of components having different particle size ranges (13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, fine sand, coarse sand, and screenings) are provided in separate hoppers (61) ( 62) (63) (64) (65) (66). In addition, recycled aggregates composed of a plurality of components (three components of 5 to 13 mm, 2.5 to 5 mm, and 0 to 2.5 mm) having different particle size ranges obtained from asphalt pavement waste materials are respectively provided in different hoppers (67) (68 ) (69). Among these, the hopper (69) accommodates the smallest particle size component (small diameter component) (0 to 2.5 mm).
In addition, it replaces with the small diameter component (0-2.5 mm) of the regenerated aggregate obtained from the asphalt pavement waste material in the hopper (69), and the small diameter component (0-2.5) of the regenerated aggregate obtained from the drainage pavement waste material. mm).

  The new aggregate and the recycled aggregate stored in the hoppers (61) (62) (63) (64) (65) (66) (67) (68) (69) are supplied from the conveyor with the belt scale described above. It is taken out by the device (7) and supplied to the transport device (9). The supply device (7) controls so that the supply amount per unit time of the aggregate of different particle diameter ranges taken out from each hopper becomes a preset target value.

The new aggregate taken out from the hoppers (61) (62) (63) (64) (65) (66) is directly supplied to the heating dryer (71) by the transport device (9).
The recycled aggregate taken out from the hoppers (67) and (68) is supplied to the indirect heating dryer (72) by the transport device (9).
In the direct heating dryer (71), the supplied new aggregate is directly heated, and in the indirectly heated dryer (72), the supplied recycled aggregate is indirectly heated.
In this way, by heating the recycled aggregate with the indirect heating dryer (72) instead of the direct heating dryer (71), the asphalt (oil) adhering to the surface of the recycled aggregate is prevented from burning and deteriorating. Can be removed. When the asphalt attached to the surface of the recycled aggregate burns, the particle size changes (decreases), which causes a problem that it becomes difficult to design a composition for obtaining an appropriate particle size distribution, which can be prevented. .

The small diameter component (0 to 2.5 mm) of the recycled aggregate taken out from the hopper (69) is sent to the indirect heating type heating device (40) by the transport device (9).
Here, the small diameter component (0 to 2.5 mm) of the recycled aggregate supplied to the heating device (40) may be the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the asphalt pavement waste material. And the small diameter component (0-2.5 mm) of the reproduction | regeneration aggregate obtained from drainage pavement waste material may be sufficient, and the mixture of both may be sufficient.

In the heating device (40), the regenerated aggregate sent is accommodated in the storage tank (41), and the regenerated aggregate is agitated by the stirring blade (43) by the rotation of the rotating shaft (42), and heating means is used. The bottom of the storage tank (41) is heated by (44).
Here, although the small-diameter component (0 to 2.5 mm) of the regenerated aggregate supplied to the heating device (40) is attached with a large amount of oil, the regenerated bone is obtained because the heating device (40) is an indirect heating type. It prevents the oil adhering to the material from burning and deteriorating.
The heating temperature of the recycled aggregate stored in the storage tank (41) is preferably set lower than the heating temperature of the direct heating dryer (71) and the indirect heating dryer (72). Thereby, it is suppressed that combustion and deterioration of an oil component arise.

The new aggregate heated by the direct heating dryer (71) is classified by a hot screen (73), weighed by a metering device (74) equipped with a hot bottle, and then each classified component is classified. Based on the measurement results, they are blended at a predetermined ratio and supplied to the mixing device (10).
Further, the regenerated aggregate heated by the indirect heating dryer (72) and the regenerated aggregate heated by the heating device (40) are also supplied to the mixing device (10).

The new aggregate and recycled aggregate supplied to the mixing device (10) are supplied from the stone powder supplied from the stone powder tank (17), the additive supplied from the additive tank (18), and the asphalt tank (19). Mixed with asphalt. Thereby, the asphalt mixture which is the final product in the present invention is obtained. The obtained asphalt mixture is supplied to the silo (31) by the trolley bucket (30) and stored.

In the method of the second embodiment, in the mixing step, the small-diameter component (0 to 2.5 mm) of the regenerated aggregate is heated by the indirect heating type heating device (40) and then supplied to the mixing device (10) for mixing. By doing, the temperature fall of asphalt compound is suppressed, fluidity | liquidity is maintained, and the construction property on the spot improves. In addition, asphalt is prevented from adhering to the inner wall of the dryer, and asphalt is prevented from burning and deteriorating and generating bad odor.
In addition, by using the direct heating dryer (71) in the heating process, even if the heating temperature by the indirect heating dryer (72) and the heating device (40) is lowered, the decrease in the finished temperature due to mixing is directly heated. It becomes possible to compensate by overheating by the type dryer (71), and it becomes possible to set an appropriate finish temperature that is easy to construct.

  Moreover, the quality of the asphalt mixture finally obtained can be improved by using the small diameter component (0-2.5 mm) of the recycled aggregate obtained from drainage pavement waste material.

In addition, by using the indirect heating type heating device (40), combustion / deterioration of oil due to heating by the heating device is prevented.
Furthermore, since the heating device (40) is provided with a stirring means, the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the drainage pavement waste and the recycled aggregate obtained from the asphalt pavement waste. When the small diameter component (0 to 2.5 mm) is supplied to the heating device (40), both these components are uniformly mixed by the stirring means.
Thereby, it becomes possible to mix the high-viscosity modified asphalt without unevenness in the mixing step, and the quality of the obtained asphalt mixture can be improved.

FIG. 3 is a flow sheet showing a third embodiment of the method for producing asphalt mixture according to the present invention.
Hereinafter, in describing the manufacturing method of the third embodiment, first, a manufacturing apparatus for carrying out the manufacturing method of the third embodiment described in the flow sheet will be described.
The manufacturing apparatus of the third embodiment has many parts in common with the manufacturing apparatus of the second embodiment (see FIG. 2). Therefore, only the configuration different from the manufacturing apparatus of the second embodiment will be described, and the same reference numerals are given to the common configuration, and the description will be omitted.

The manufacturing apparatus of the third embodiment is different from the manufacturing apparatus of the second embodiment as follows.
First, out of a plurality of hoppers (67) (68) (69) each containing a regenerated aggregate composed of a plurality of components having different particle size ranges obtained from asphalt waste, a hopper (67) (68) I do not have. Of course, the feeding device (7) and the conveying device (9) attached to these hoppers (67) and (68) are not provided.
Secondly, it does not have an indirect heating dryer (72) that takes in the recycled aggregate and heats it.

Hereinafter, 3rd embodiment of the manufacturing method of the asphalt compound material which concerns on this invention is described based on the flow sheet of FIG.
First, new aggregates composed of a plurality of components (fine sand, coarse sand, and screenings) having different particle size ranges are accommodated in separate hoppers (64), (65), and (66). In addition, recycled aggregates made from asphalt pavement waste and made from multiple components with different particle size ranges (13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, and 0 to 2.5 mm, 4 components), 61) (62) (63) (69). Among these, the hopper (69) accommodates the smallest particle size component (small diameter component) (0 to 2.5 mm).
In addition, it replaces with the small diameter component (0-2.5 mm) of the regenerated aggregate obtained from the asphalt pavement waste material in the hopper (69), and the small diameter component (0-2.5) of the regenerated aggregate obtained from the drainage pavement waste material. mm).

The new aggregates taken out from the hoppers (64) (65) (66) and the recycled aggregates taken out from the hoppers (61) (62) (63) are directly heated by the conveying device (9). Supplied to.
In the direct heating dryer (71), the supplied new aggregate is directly heated.
Here, since the recycled aggregate heated by the direct heating dryer (71) does not contain the smallest particle size component (small diameter component) (0 to 2.5 mm), it adheres to the surface of the recycled aggregate. Asphalt (oil) is prevented from burning and deteriorating. When the asphalt attached to the surface of the recycled aggregate burns, the particle size changes (decreases), which causes a problem that it becomes difficult to design a composition for obtaining an appropriate particle size distribution, which can be prevented. .

The small diameter component (0 to 2.5 mm) of the recycled aggregate taken out from the hopper (69) is sent to the indirect heating type heating device (40) by the transport device (9).
Here, the small diameter component (0 to 2.5 mm) of the recycled aggregate supplied to the heating device (40) may be the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the asphalt pavement waste material. And the small diameter component (0-2.5 mm) of the reproduction | regeneration aggregate obtained from drainage pavement waste material may be sufficient, and the mixture of both may be sufficient.

In the heating device (40), the regenerated aggregate sent is accommodated in the storage tank (41), and the regenerated aggregate is agitated by the stirring blade (43) by the rotation of the rotating shaft (42), and heating means is used. The bottom of the storage tank (41) is heated by (44).
Here, although the small-diameter component (0 to 2.5 mm) of the regenerated aggregate supplied to the heating device (40) is attached with a large amount of oil, the regenerated bone is obtained because the heating device (40) is an indirect heating type. It prevents the oil adhering to the material from burning and deteriorating.
The heating temperature of the recycled aggregate stored in the storage tank (41) is preferably set lower than the heating temperature by the direct heating dryer (71). Thereby, it is suppressed that combustion and deterioration of an oil component arise.

The new aggregate and the regenerated aggregate heated by the direct heating dryer (71) are classified by the hot screen (73), weighed by the weighing device (74) equipped with a hot bottle, and then classified. Each component is blended at a predetermined ratio based on the measurement result and supplied to the mixing device (10).
The recycled aggregate heated by the heating device (40) is also supplied to the mixing device (10).

The new aggregate and recycled aggregate supplied to the mixing device (10) are supplied from the stone powder supplied from the stone powder tank (17), the additive supplied from the additive tank (18), and the asphalt tank (19). Mixed with asphalt. Thereby, the asphalt mixture which is the final product in the present invention is obtained. The obtained asphalt mixture is supplied to the silo (31) by the trolley bucket (30) and stored.

In the method of the third embodiment, since the indirectly heated dryer (72) is not used, the equipment cost can be reduced and the installation space of the equipment can be reduced.
In addition, as the new aggregate, only fine sand, coarse sand and screenings are used, so other ingredients (0-2.5mm, 2.5-5mm, 5-13mm, 13-20mm) ) Makes it possible to use 100% of recycled aggregate.
Here, the reclaimed aggregate used (0-2.5mm, 2.5-5mm, 5-13mm, 13-20mm) has undergone a process (pre-process described later) for removing oil coated on the surface. In addition, since the small-diameter component (0 to 2.5 mm) with the most oil adhesion is indirectly heated by the heating device (40), the particle size of the recycled aggregate changes (decreases) due to the combustion of the oil in the heating process. There is no. Therefore, even if 100% of recycled aggregate is used, a blending design for obtaining an appropriate particle size distribution becomes possible.

Further, in the mixing step, the small diameter component (0 to 2.5 mm) of the recycled aggregate is heated by the indirect heating type heating device (40) and then supplied to the mixing device (10) to be mixed. The temperature drop of the material is suppressed, the fluidity is maintained, and the on-site workability is improved. In addition, asphalt is prevented from adhering to the inner wall of the dryer, and asphalt is prevented from burning and deteriorating and generating bad odor.
Moreover, even if the heating temperature by the heating device (40) is lowered by using the direct heating dryer (71) in the heating process, the reduction in the finished temperature due to the mixing is excessively heated by the direct heating dryer (71). Therefore, it is possible to set the temperature to an appropriate finish temperature that is easy to construct.

  Moreover, the quality of the asphalt mixture finally obtained can be improved by using the small diameter component (0-2.5 mm) of the recycled aggregate obtained from drainage pavement waste material.

In addition, by using the indirect heating type heating device (40), combustion / deterioration of oil due to heating by the heating device is prevented.
Furthermore, since the heating device (40) is provided with a stirring means, the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the drainage pavement waste and the recycled aggregate obtained from the asphalt pavement waste. When the small diameter component (0 to 2.5 mm) is supplied to the heating device (40), both these components are uniformly mixed by the stirring means.
Thereby, it becomes possible to mix the high-viscosity modified asphalt without unevenness in the mixing step, and the quality of the obtained asphalt mixture can be improved.

FIG. 4 is a flow sheet showing a fourth embodiment of the asphalt composite manufacturing method according to the present invention.
Hereinafter, in describing the manufacturing method of the fourth embodiment, first, a manufacturing apparatus for carrying out the manufacturing method of the fourth embodiment described in the flow sheet will be described.
Since the manufacturing apparatus of the fourth embodiment also has many parts in common with the manufacturing apparatus of the second embodiment (see FIG. 2), only the configuration different from the manufacturing apparatus of the second embodiment will be described, and the same configuration is the same. The reference numerals are attached and the description is omitted.

  The difference between the manufacturing apparatus of the fourth embodiment and the manufacturing apparatus of the second embodiment is that in the apparatus of the second embodiment, the components (recycled aggregate) taken out from the indirectly heated dryer (72) are directly mixed (10 In the apparatus of the fourth embodiment, the component (regenerated aggregate) taken out from the indirectly heated dryer (72) is passed through the hot screen (73) and the weighing device (74). It is the structure which supplies to a mixing apparatus (10).

Hereinafter, 4th embodiment of the manufacturing method of the asphalt compound material which concerns on this invention is described based on the flow sheet of FIG.
First, new aggregates composed of a plurality of components having different particle size ranges (13 to 20 mm, 5 to 13 mm, 2.5 to 5 mm, fine sand, coarse sand, and screenings) are provided in separate hoppers (61) ( 62) (63) (64) (65) (66). In addition, recycled aggregates composed of a plurality of components (three components of 5 to 13 mm, 2.5 to 5 mm, and 0 to 2.5 mm) having different particle size ranges obtained from asphalt pavement waste materials are respectively provided in different hoppers (67) (68 ) (69). Among these, the hopper (69) accommodates the smallest particle size component (small diameter component) (0 to 2.5 mm).
In addition, it replaces with the small diameter component (0-2.5 mm) of the regenerated aggregate obtained from the asphalt pavement waste material in the hopper (69), and the small diameter component (0-2.5) of the regenerated aggregate obtained from the drainage pavement waste material. mm).

  The new aggregate and the recycled aggregate stored in the hoppers (61) (62) (63) (64) (65) (66) (67) (68) (69) are supplied from the conveyor with the belt scale described above. It is taken out by the device (7) and supplied to the transport device (9). The supply device (7) controls so that the supply amount per unit time of the aggregate of different particle diameter ranges taken out from each hopper becomes a preset target value.

The new aggregate taken out from the hoppers (61) (62) (63) (64) (65) (66) is directly supplied to the heating dryer (71) by the transport device (9).
The recycled aggregate taken out from the hoppers (67) and (68) is supplied to the indirect heating dryer (72) by the transport device (9).
In the direct heating dryer (71), the supplied new aggregate is directly heated, and in the indirectly heated dryer (72), the supplied recycled aggregate is indirectly heated.
In this way, by heating the recycled aggregate with the indirect heating dryer (72) instead of the direct heating dryer (71), the asphalt (oil) adhering to the surface of the recycled aggregate is prevented from burning and deteriorating. Can be removed. When the asphalt attached to the surface of the recycled aggregate burns, the particle size changes (decreases), which causes a problem that it becomes difficult to design a composition for obtaining an appropriate particle size distribution, which can be prevented. .

The small diameter component (0 to 2.5 mm) of the recycled aggregate taken out from the hopper (69) is sent to the indirect heating type heating device (40) by the transport device (9).
Here, the small diameter component (0 to 2.5 mm) of the recycled aggregate supplied to the heating device (40) may be the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the asphalt pavement waste material. And the small diameter component (0-2.5 mm) of the reproduction | regeneration aggregate obtained from drainage pavement waste material may be sufficient, and the mixture of both may be sufficient.

In the heating device (40), the regenerated aggregate sent is accommodated in the storage tank (41), and the regenerated aggregate is agitated by the stirring blade (43) by the rotation of the rotating shaft (42), and heating means is used. The bottom of the storage tank (41) is heated by (44).
Here, although the small-diameter component (0 to 2.5 mm) of the regenerated aggregate supplied to the heating device (40) is attached with a large amount of oil, the regenerated bone is obtained because the heating device (40) is an indirect heating type. It prevents the oil adhering to the material from burning and deteriorating.
The heating temperature of the recycled aggregate stored in the storage tank (41) is preferably set lower than the heating temperature of the direct heating dryer (71) and the indirect heating dryer (72). Thereby, it is suppressed that combustion and deterioration of an oil component arise.

The new aggregate heated by the direct heating dryer (71) and the recycled aggregate heated by the indirect heating dryer (72) are classified by the hot screen (73), and the weighing device (74 equipped with a hot bottle) ), The classified components are blended at a predetermined ratio based on the measurement result and supplied to the mixing device (10).
The recycled aggregate heated by the heating device (40) is supplied to the mixing device (10) by the transport device (9).

The new aggregate and recycled aggregate supplied to the mixing device (10) are supplied from the stone powder supplied from the stone powder tank (17), the additive supplied from the additive tank (18), and the asphalt tank (19). Mixed with asphalt. Thereby, the asphalt mixture which is the final product in the present invention is obtained. The obtained asphalt mixture is supplied to the silo (31) by the trolley bucket (30) and stored.

In the method of the fourth embodiment, in the mixing step, the small-diameter component (0 to 2.5 mm) of the regenerated aggregate is heated by the indirect heating type heating device (40) and then supplied to the mixing device (10) for mixing. By doing, the temperature fall of asphalt compound is suppressed, fluidity | liquidity is maintained, and the construction property on the spot improves. In addition, asphalt is prevented from adhering to the inner wall of the dryer, and asphalt is prevented from burning and deteriorating and generating bad odor.
In addition, by using the direct heating dryer (71) in the heating process, even if the heating temperature by the indirect heating dryer (72) and the heating device (40) is lowered, the decrease in the finished temperature due to mixing is directly heated. It becomes possible to compensate by overheating by the type dryer (71), and it becomes possible to set an appropriate finish temperature that is easy to construct.

  Moreover, the quality of the asphalt mixture finally obtained can be improved by using the small diameter component (0-2.5 mm) of the recycled aggregate obtained from drainage pavement waste material.

In addition, by using the indirect heating type heating device (40), combustion / deterioration of oil due to heating by the heating device is prevented.
Furthermore, since the heating device (40) is provided with a stirring means, the small diameter component (0 to 2.5 mm) of the recycled aggregate obtained from the drainage pavement waste and the recycled aggregate obtained from the asphalt pavement waste. When the small diameter component (0 to 2.5 mm) is supplied to the heating device (40), both these components are uniformly mixed by the stirring means.
Thereby, it becomes possible to mix the high-viscosity modified asphalt without unevenness in the mixing step, and the quality of the obtained asphalt mixture can be improved.

  In addition, after the recycled aggregate heated by the indirect heating dryer (72) is supplied directly to the hot screen (73) without being supplied to the mixing device (10), and separated by particle size by the hot screen (73). Then, the components separated for each particle size are supplied to the weighing device (74) to measure each component, and the respective components are blended at a predetermined ratio based on the measurement result by the weighing device (74). Since it supplies to an apparatus (10), a highly accurate mixing | blending is attained and the quality of the obtained asphalt compound material can be improved further.

In the first to fourth embodiments, a plurality of components having different particle size ranges have been described with the particle size ranges of the respective components being 0 to 2.5 mm, 2.5 to 5 mm, 5 to 13 mm, and 13 to 20 mm.
However, in the present invention, the numerical value (upper limit value and lower limit value) of the particle size range of each component is not limited to this. For example, as described above, the component having the smallest particle size can be set to 0 to 5 mm.

Next, the recycled aggregate accommodated in each hopper (1) (2) (3) (4) (5) (11) (12) (51) (52) in the first embodiment, and the second embodiment Reclaimed aggregates housed in the hoppers (67), (68), and (69), reclaimed aggregates housed in the hoppers (61), (62), (63), and (69) in the third embodiment, The process (henceforth a pre-process) for obtaining the reproduction | regeneration aggregate accommodated in each hopper (67) (68) (69) in 4 embodiment is demonstrated.
FIG. 10 is a flow sheet showing the pre-process.
This pre-process is a process of removing the oil component coated on the surface of the regenerated aggregate (regenerated single grain crushed stone).
First, the case where an asphalt lump is used as a raw material will be described.

The raw asphalt block made of asphalt pavement waste or drainage pavement waste is supplied to the primary crushing facility (20) so as to be crushed to a certain particle size or less (for example, 40 mm or less).
A roll crusher is suitably used as the primary crushing equipment (20).
In the case of using a roll crusher, a fixed amount supply mechanism can be provided by adjusting the number of rotations of the roller.

The raw material crushed to a certain particle size or less by the primary crushing equipment (20) is conveyed to the secondary crushing equipment (22) by the conveying equipment (21) such as a belt conveyor.
The secondary crushing equipment (22) is for removing oil (asphalt) adhering to the surface of the raw material, and a granulator, an impact crusher, a grinder, a grinder, etc. are used.
As the particle sizer, PES Brass (trade name) manufactured by Earth Technica Co., Ltd., Gyropactor (trade name) manufactured by Nakayama Iron Works, Ltd., New Dick (trade name) manufactured by Rasa Industrial Co., Ltd., etc. are suitable. used.
As the impact crusher, an impeller breaker or a super sander (both trade names) manufactured by Earth Technica Co., Ltd. are preferably used.
As a polishing machine, a drum reclaimer (trade name) manufactured by Earth Technica Co., Ltd. is preferably used.
As the grinder, Double Beetle (trade name) manufactured by Maruei Shoji Co., Ltd., Super Gaos (trade name) made of Daito Tochi wooden, etc. are preferably used.

The raw material from which oil (asphalt) adhering to the surface has been removed by the secondary crushing equipment (22) is transported to the screening equipment (24) by the transport equipment (23) such as a belt conveyor.
The sieving equipment (24) is composed of a three-stage screen in which four types of screens with different sieves are combined in the horizontal direction (or inclined direction) and the vertical direction, and the raw material supplied from the secondary crushing equipment (22) is Sort into 5 types of particle size components (recycled aggregates) of ~ 2.5mm, 2.5-5mm, 5-13mm, 13-20mm, 20mm or more.
In addition, by changing the number of screen stages and screens of the sieving equipment (24), the particle size range to be sorted can be appropriately changed. For example, the smallest particle size component is 0-5 mm or 0-13 mm. It can be sorted out as follows.

Next, the case where an asphalt cutting material is used as a raw material will be described with reference to FIG.
The cutting material used as a raw material is put into an inclined lattice-equipped hopper (25) having a lattice with an inclination angle.
Since the raw material supplied to the inclined hopper with a lattice (25) falls beyond the hopper if it has a certain particle size or more, only a material having a certain particle size or less (for example, 40 mm or less) is accommodated in the hopper (25). The

  In addition, in this invention, instead of throwing the cutting material used as a raw material into the inclined type grid-equipped hopper (25), by supplying it to the primary crushing equipment (20) composed of the above-described roll crusher, a predetermined particle size or less. (For example, 40 mm or less) can be crushed.

The raw material with a fixed particle diameter or less taken out from the inclined hopper with grid (25) or the primary crushing equipment (20) is fed into the above-mentioned secondary crushing equipment (22) by a fixed amount by a fixed amount supply device (26). Supplied.
As the fixed quantity supply device (26), a reciprocating feeder, a belt feeder, a vibro feeder or the like is preferably used.

The raw material supplied to the secondary crushing facility (22) is removed after removing oil (asphalt) adhering to the surface, and is transported to the screening facility (24) by a transport facility (23) such as a belt conveyor. .
The sieving equipment (24) is made from the raw material supplied from the secondary crushing equipment (22) with five kinds of particle size components (recycled from 0 to 2.5mm, 2.5 to 5mm, 5 to 13mm, 13 to 20mm, 20mm or more). (Aggregate)
In addition, by changing the number of screen stages and screens of the sieving equipment (24), the particle size range to be sorted can be appropriately changed. For example, the smallest particle size component is 0-5 mm or 0-13 mm. It can be sorted out as follows.

  Thus, the regenerated single-grain crushed stone (regenerated aggregate) obtained through the pre-process shown in FIG. 10 is supplied as a raw material to the post-process shown in FIGS. Used for the production of

As described above, in the previous process shown in FIG. 10, the crushing equipment for crushing the raw asphalt lump or cutting material made of asphalt pavement waste material or drainage pavement waste material by using the impact collision action, the grinding action Supply to any of the polishing equipment that performs polishing, the sizing equipment with sizing action, or the grinding equipment with pulverizing action to remove the oil (asphalt) coated on the surface, and then supply it to the sieving equipment Then, the recycled aggregate can be obtained by separating and collecting into a plurality of components having different particle size ranges.
In the recycled aggregate obtained in this way, the amount of oil adhering is reduced by scraping off the surface to which oil (asphalt) has adhered, so that in the heating step of the post-process (FIGS. 1 to 4) The oil content is prevented from burning and the particle size is largely reduced, and the blending design for obtaining an appropriate particle size distribution is facilitated.

However, as described above, the high-viscosity modified asphalt adhering to the surface of the component having the smallest particle size (for example, 0 to 2.5 mm) of the drainage pavement waste material is sufficiently removed even in the previous step shown in FIG. Can not do it. By reversing this problem, it is difficult to recycle by using as the raw material the component with the smallest particle size (for example, 0 to 2.5mm) of drainage pavement waste with a large amount of high-viscosity modified asphalt attached. As a result, it is possible to improve the quality of the asphalt mixture while effectively utilizing the drainage pavement waste.
In addition, the component with the smallest particle size (for example, 0 to 2.5mm) of drainage pavement waste material is heated with an indirect heating type heating device different from the dryer, and then supplied to the mixing device to be mixed, resulting in high viscosity The modified asphalt can be prevented from adhering to the inner surface of the dryer and burning / deteriorating, and at the same time, the flowability of the resulting asphalt mixture can be increased to improve the workability.

  INDUSTRIAL APPLICABILITY The present invention is used for producing asphalt composites using recycled aggregate obtained from asphalt pavement waste and drainage pavement waste.

1 Hopper 2 Hopper 3 Hopper 4 Hopper 6 Hopper 61 Hopper 62 Hopper 63 Hopper 64 Hopper 65 Hopper 66 Hopper 67 Hopper 68 Hopper 69 Hopper 71 Direct heating dryer 72 Indirect heating dryer 8 Dryer 80 Rotating drum 81 Inside heating burner 82 Tube
83 Raising blade 10 Mixing device 11 Hopper 12 Hopper 40 Indirect heating type heating device

Claims (8)

A heating step of heating a regenerated single-grain crushed stone composed of a plurality of components having different particle size ranges with a dryer, using the regenerated single-grain crushed stone composed of a plurality of components having different particle size ranges obtained from asphalt waste, and the dryer A method for producing an asphalt mixture comprising a mixing step of mixing recycled single-grain crushed stone after being heated together with an additive and asphalt,
The regenerated single-grain crushed stone has undergone a step of removing oil coated on the surface,
In the mixing step, the component having the smallest particle size among the plurality of components of the regenerated single-grain crushed stone used as a raw material is heated by an indirect heating type heating device different from the dryer and then supplied to the mixing device. A method for producing an asphalt mixture, characterized by comprising:   The small-diameter component of the regenerated single-grain crushed stone obtained from drainage pavement waste is used as the component having the smallest particle size among the plurality of components of the regenerated single-grain crushed stone used as the raw material. The manufacturing method of asphalt compound material of description.   The small diameter component of the regenerated single particle crushed stone obtained from asphalt pavement waste is used as the smallest particle size component among the plurality of components of the regenerated single particle crushed stone used as the raw material. Of manufacturing asphalt composites.   Among the components of the regenerated single particle crushed stone used as the raw material, the smallest particle size component obtained from the drainage pavement waste material and the regenerated single particle obtained from the asphalt pavement waste material are used. The method for producing an asphalt mixture according to claim 1, wherein a mixture of small-diameter components of granular crushed stone is used.   The method for producing an asphalt mixture according to claim 4, wherein the heating device is provided with stirring means, and the mixture is heated while being stirred by the stirring means.   In the heating step, a rotating drum that is disposed so as to be gradually lowered from one end to the other end, and heating that radiates a flame from the one end to the other end in the rotating drum. The method for producing an asphalt mixture according to any one of claims 1 to 5, wherein a dryer having a burner and an inner cylinder mounted so as to cover the periphery of the flame of the heating burner is used. In addition to the recycled single-grain crushed stone as a raw material, a new single-grain crushed stone made of a plurality of components having different particle size ranges obtained from a new aggregate is used.
The dryer used in the heating step consists of a direct heating dryer and an indirect heating dryer,
Heat the new single grain crushed stone with the direct heating dryer,
6. The component having the smallest particle size among a plurality of components of the regenerated single-grain crushed stone is heated by the heating device, and the remaining components are heated by the indirect heating dryer. The manufacturing method of the asphalt compound material in any one. Supplying the regenerated single-grain crushed stone component heated by the indirect heating dryer and the new single-grain crushed stone component heated by the direct heating dryer to a screen;
Classifying the components supplied in the screen for each particle size;
The ingredients classified for each particle size are supplied to a measuring device to measure each ingredient,
8. The method for producing an asphalt mixture according to claim 7, wherein the respective components are blended at a predetermined ratio based on a measurement result by the measuring device and supplied to the mixing device.