JPH10279811A - Asphalt mixture, production method and production apparatus - Google Patents

Abstract

(57) [PROBLEMS] To provide an asphalt mixture which is capable of automatically producing a colored asphalt mixture without requiring work under a severe and inferior environment, and a method and an apparatus for producing the same. With the goal. A pigment tank (42) composed of a surge bin is provided, and the pigment is automatically charged into the pigment tank (42) from a tank truck (53) through an air pressure pipe (52).
Further, when producing a colored asphalt mixture, the pigment is supplied from a surge bin 42 to a pigment measuring device 44 by a screw conveyor 43, and the pigment is measured there.
In this example, the pigment was added to the sample No. 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt mixture, a method and an apparatus for producing the same, and more particularly to an asphalt mixture colored by a pigment, a method for producing the same, and an apparatus for producing the same.

[0002]

2. Description of the Related Art The main component of asphalt is a substance called bitumen, which is a mixture of hydrocarbons produced by natural or artificial heat treatment and completely dissolved in carbon disulfide. Appearance is black or dark brown material,
It has the property of gradually liquefying from a solid or semi-solid by heating. It is water-resistant, water-resistant, durable and has high adhesive strength. Taking advantage of these properties, roads, buildings,
It is used in a wide range of ports, rivers and agricultural civil engineering. Asphalt, a typical bituminous material,
In general, it is widely used for road pavement materials.

[0003] The diversification of people's lives and personal values has led to new needs such as coexistence with the environment and beauty, in addition to conventional needs that emphasize functionality and efficiency, even on road pavements. It is required to continue. That is, a color synthetic material using a pigment has been widely used for the purpose of mainly performing functions such as conventional classification display by color coding, bus lanes and bus stops, school zones, intersections, and parking lots. Particularly for bus lanes, color materials tend to be widely used. Also, in order to harmonize with natural landscapes and cityscapes, sidewalks such as parks, promenades, zoos, and historic sites have been color-paved.

[0004]

When performing such color paving, a color asphalt mixture containing a pigment is used. An issue when producing color asphalt materials is the working environment. That is, in many cases, the pigment is directly injected into the mixer by hand, and the problem of dust scattering at the time of injection,
This involved the rigorous work of manually lifting the pigment to the slot, and there were many problems related to the working environment of the workers.

[0005] A major factor that has hindered the automatic production of color asphalt, especially the development of automatic pigment dosing systems, is the difficulty in delivering and metering the pigment. Conventional powdered pigments cause a bridging phenomenon in the apparatus, and often hinder pneumatic feeding, screw conveyor conveyance, and use of an automatic weighing apparatus, which are indispensable for an automatic charging system. For these reasons, there has been a problem that a severe operation in the above-mentioned poor environment is required.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a manufacturing method and a manufacturing apparatus for automatically manufacturing an asphalt mixture colored by a pigment and an asphalt mixture. Aim.

[0007]

The invention relating to asphalt mixture relates to an asphalt mixture obtained by mixing asphalt with an aggregate and a granular pigment mainly composed of iron oxide.

[0008] The granular pigment containing iron oxide as a main component may have a diameter of 0.05 to 5.0 mm.

The present invention relates to a method for producing an asphalt mixture in which a granular pigment is automatically charged, and the granular pigment is mixed with asphalt and aggregate by a mixer to obtain a colored asphalt mixture. It is about.

[0010] The particulate pigment may contain iron oxide as a main component and have a diameter of 0.05 to 5.0 mm.

[0011] The granular pigment may be stored in a tank, and the pigment may be fed into the tank by air pressure, and the pigment may be supplied from the tank by a screw conveyor and mixed.

[0012] Next, an invention relating to a manufacturing apparatus is provided by an asphalt supply means for supplying asphalt, an aggregate supply means for supplying an aggregate, a pigment supply means for supplying a granular pigment, and the asphalt supply means. The present invention relates to an apparatus for producing an asphalt mixture, comprising: asphalt, an aggregate supplied by the aggregate supply means, and a mixer for mixing the pigment supplied by the pigment supply means.

[0013] The pigment supply means may include a tank for temporarily storing the particulate pigment, and a required amount of pigment may be supplied to the mixer from the tank.

[0014]

FIG. 1 and FIG. 2 show an entire configuration of a manufacturing apparatus for carrying out a method for manufacturing an asphalt mixture according to an embodiment of the present invention. Here, the asphalt is stored in the asphalt tank 10, and the asphalt in the asphalt tank 10 is pressure-fed by the supply pump 11 and supplied to the asphalt measuring device 12. And after being weighed by the asphalt measuring device 12,
The supplied asphalt is supplied to the mixer 13.

Next, the aggregate is stored in a stock yard 16. The aggregate in the stock yard 16 is taken out through the cold feeder 17 and supplied to the cold elevator 19 via the accumulation conveyor 18 or without the accumulation conveyor 18 as necessary. The aggregate is dried by a dryer 20 connected to the cold elevator 19. The shovel loader 21 may be interposed between the stock yard 16 and the cold feeder 17.

A fuel tank 24 is provided to supply fuel to the dryer 20, and the burner 25 is burned by heavy oil supplied from the fuel tank 24, and the flame causes high-temperature gas to flow back into the dryer 20. Then, the high-temperature gas is discharged from the upper end side of the dryer 20 and the dust collector 2
The dust is removed by 6 and exhausted to the atmosphere by an exhauster 27.

The aggregate dried by the dryer 20 is lifted above the mixer 13 by the hot elevator 30 and is put into the vibration sieving device 31. The vibrating sieving device 31 has a hot bin 32 on the upper side and an aggregate weighing device 33 on the lower side.

The stone powder charged into the mixer 13 together with the aggregate is stored in a stone powder silo 36, lifted upward by a stone powder elevator 37, and supplied to a stone powder meter 39 through a hopper 38.

Next, the pigment in the form of particles is stored in a pigment tank 42 composed of a surge bin, is taken out from the bottom by a screw conveyor 43, and is supplied to a pigment measuring device 44 where it is weighed.
It is to be thrown into.

In the mixer 13, a pair of stirring rotors 47 are provided.
By rotating such a rotor 47, the separately supplied and weighed asphalt, aggregate, stone powder, and pigment are respectively mixed, thereby producing a colored asphalt mixture. Like that. The produced asphalt mixture was mixed in mixer 1
When the lower gate of No. 3 is opened, it is moved to the loading platform of the dump truck 48 waiting below. Then, such a dump truck 48 transports the asphalt mixture to the pavement site and is used for pavement work.

FIG. 3 particularly shows the pigment supply mechanism in more detail, and shows a pigment tank 4 composed of a surge bin.
An air pumping tube 52 is provided for pumping the pigment to the nozzle 2. The air pressure pipe 52 is connected to an air pressure pump 54 of a tank truck 53. In other words, the pigment in the form of particles that has been transported while being filled in the tank of the tank truck 53 is supplied into the surge bin 42 through the air pressure pipe 52 by the air pressure pump 54.

A screw conveyor 43 is provided on the bottom side of the surge bin 42 so as to extend substantially in the horizontal direction.
Is supplied to the pigment measuring device 44 from the bottom of the container. The bottom side of the weighing device 44 faces the mixer 13. Therefore, the color asphalt mixture is manufactured by putting the pigment measured by the measuring device 44 into the mixer 13 and mixing the pigment with asphalt, aggregate, stone powder and the like.

In producing the color asphalt mixture,
A major factor that has hindered the automatic introduction of pigments was that the pigments caused a bridging phenomenon in the apparatus, making it difficult to perform pneumatic feeding and automatic weighing. Therefore, in this embodiment, a granular pigment is adopted to solve this problem.

The pigment used here is a pigment composed of iron oxide, titanium oxide, chromium oxide, cobalt compound and the like. Some examples are as follows.

Yellow: FeOOH Red: Fe ₂ O ₃ Black: Fe ₃ O ₄ Brown: Fe ₂ O ₃ + Fe ₃ O ₄ White: TiO ₂ Green: CrO ₃ Blue: Cobalt blue Such iron oxide has a binder added. Manufactured by a spray-drying method and are granular particles. Here, as the binder, for example, a phosphoric acid compound may be used. This solidification with the binder allows for quick dispersion in the asphalt and prevents breakage or caking during transport or long-term storage.

Here, the particulate pigment has a diameter of 0.05-5.
It may be 0 mm. In particular, the pigment preferably has a size of 0.1 to 0.8 mm, and more preferably a pigment having a uniform particle size of 0.2 to 0.4 mm. In the case of such a pigment, particularly when each particle is a granule having a substantially spherical shape, the fluidity becomes extremely high. Therefore, no bridging of the pigment occurs in the apparatus, and the behavior is completely different from that of the conventional powdery pigment, so that the bridging phenomenon can be avoided.

The general physical properties of typical pigments used in the present embodiment will be described. The bulk specific gravity is higher by about 30 to 40% than that of a conventional powdery pigment, and the volume is reduced accordingly. I have. As a result, the size of the surge bin 42 can be considerably reduced, and the pigment can be transported by the tank truck 53 effectively. This has great significance in improving the economics of the system. If there is no place to store a large amount of pigment for a long period of time, the pigment must be supplied from the pigment maker at the time of manufacture as necessary. However, the surge bin 42 is provided.
This problem is solved by allowing the pigment to be stored within. This made it possible to produce color asphalt mixtures as needed.

The granular pigment used here is:
It is granular. Granular pigments are produced by a spray drying method. In addition, special binders are added to prevent the granules from breaking or caking due to transportation and long-term stock. As a result, the pneumatic feed pipe 5 from the tank truck 53
2 and the transfer of the pigment from the surge bin 42 to the pigment measuring device 44 by the screw conveyor 43, and can be stored in the surge bin 42 for a long period of time.

As described above, the pigment is always stored in the surge bin 42 and a system for supplying the pigment at any time is prepared, so that it is possible to immediately respond to an order for a color asphalt mixture. The size of the surge bin 42 is determined by the maximum amount of pigment used at one time in a normal factory,
By calculating the number of days required to deliver the pigment, it is assumed here that the capacity is such that about 8 tons of pigment can be stored. In the case of a red granular pigment, its bulk specific gravity is about 1.2 g /
cm, a surge bin 42 of about 7 m ³ is used.

When supplying the pigment to the surge bin 42,
If the flexible container bag filled with the pigment is lifted and thrown in from the upper part of the surge bin 42, not only does the work become complicated, but also labor cannot be completely eliminated,
Full automation will be hindered. In the present embodiment, the tank of the tank truck 53 and the surge bin 42
Are connected by a pneumatic feed pipe 52, and the pneumatic pump 5
4 enables automatic supply of the particulate pigment into the surge bin 42.

Using the tank truck 53, the surge bin 4
In order to keep the shape of the pigment when the pigment is introduced into the container 2 by the pneumatic pumping method, the diameter of the pneumatic pumping tube 52 is set to 10 cm or more in consideration of the applied air pressure and the amount of pumping. In addition, the number of straight portions is increased as much as possible, and if a curved portion is unavoidable, the shape is at least an arc having a radius of 1 m.

Although the air pressure needs to be about 1.5 atm at the time of initial pumping, the pigment can be smoothly pumped into the surge bin 42 through the air pumping pipe 52 by maintaining the average pressure at 1.2 atm. Became. When the granular pigment is pneumatically fed by the pneumatic feeding pipe 52, the front of the tank truck 53 is lifted and the tank truck 53 is lifted.
The tank can be more effectively pumped by tilting it. 7
It has been determined that it takes about 30 minutes to pump tons of pigment to surge bin 42.

Next, as the screw conveyor 43 used to supply the pigment from the surge bin 42 to the pigment measuring device 44, a screw conveyor provided with a special box according to the behavior of the pigment is effective. It is preferable that the screw pitch angle of the screw conveyor 43 does not exceed 30 °. If the screw conveyor 43 has a certain degree of inclination, the screw conveyor 43 may fall naturally. Therefore, when the inclination is large, it is preferable to provide a special outflow prevention device.

By providing a plurality of sets of such pigment supply devices including the surge bin 42 for each color, asphalt mixtures of various colors can be arbitrarily manufactured.

On the other hand, as shown in the figure, when only a single pigment supply device composed of a single surge bin 42 is provided, when the color is changed according to the lot change,
There is a concern that the pigment of the previous lot remaining in the apparatus may adversely affect the color tone. Therefore, when the pigment is changed due to the change of the lot, it is possible to eliminate the adverse effect of the hue on the asphalt mixture of the next lot by removing the remaining pigment by flowing stone powder once in this apparatus. .

[0036]

The invention relating to an asphalt mixture relates to an asphalt mixture obtained by mixing asphalt with an aggregate and a particulate pigment mainly composed of iron oxide.

Therefore, according to the present invention, a colored asphalt mixture is obtained by the granular pigment mixed with the asphalt together with the aggregate. In particular, the use of a particulate pigment facilitates its production.

According to the constitution in which the diameter of the particulate pigment containing iron oxide as a main component is 0.05 to 5.0 mm, the pigment is well dispersed at the time of mixing, and is suitable for transportation and long-term storage. In this case, caking is prevented.

According to the invention relating to the production method, a granular pigment is automatically charged, and the granular pigment is mixed with asphalt and aggregate by a mixer to obtain a colored asphalt mixture.

Therefore, according to the present invention, it is possible to automatically produce a colored asphalt mixture, and it is not necessary to perform a severe operation in a bad environment.

According to the configuration in which the particulate pigment is mainly composed of iron oxide and has a diameter of 0.05 to 5.0 mm, the problem of bridging, particularly the occurrence of a bridge phenomenon, is prevented when the particulate pigment is charged. Become so.

According to the structure in which the pigment particles are stored in a tank, the pigment is supplied to the tank by air pressure, and the pigment is supplied from the tank by a screw conveyor and mixed, the pigment is occasionally colored. It becomes possible to produce asphalt mixtures.

The invention relating to the manufacturing apparatus includes asphalt supply means for supplying asphalt, aggregate supply means for supplying aggregate, pigment supply means for supplying pigment in granular form, and asphalt supplied by asphalt supply means. A mixer for mixing the aggregate supplied by the aggregate supply unit and the pigment supplied by the pigment supply unit is provided.

The apparatus according to the invention thus makes it possible to produce colored asphalt mixtures automatically.

According to a construction in which the pigment supply means is provided with a tank for temporarily storing the particulate pigment, and a required amount of pigment is supplied from the tank to the mixer, the pigment is always stored in the tank. This makes it possible to produce a colored asphalt mixture as required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a method for producing an asphalt mixture.

FIG. 2 is a perspective view of a main part showing an outline of an asphalt mixture manufacturing apparatus.

FIG. 3 is a front view showing an automatic pigment feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Asphalt tank 11 Supply pump 12 Asphalt measuring device 13 Mixer 16 Stock yard 17 Cold feeder 18 Accumulating conveyor 19 Cold elevator 20 Dryer 21 Shovel loader 24 Fuel tank 25 Burner 26 Dust collector 27 Exhaust air machine 30 Hot elevator 31 Vibrating sieve 32 Hot-water bin 32 Material measuring device 36 Stone powder silo 37 Stone powder elevator 38 Hopper 39 Stone powder measuring device 42 Pigment tank (surge bin) 43 Screw conveyor 44 Pigment measuring device 47 Stirring rotor 48 Dump truck 52 Pneumatic feed pipe 53 Tank lorry 54 Air pressure pump

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Yoshida 1-41-103-103, Konan-ku, Yokohama, Kanagawa Prefecture (72) Inventor Junichi Tsubota 12-60-701 Horiguchi, Kanazawa-ku, Yokohama, Kanagawa Prefecture

Claims (7)

[Claims] 1. An asphalt mixture obtained by mixing asphalt with an aggregate and a granular pigment containing iron oxide as a main component. 2. The asphalt mixture according to claim 1, wherein said particulate pigment containing iron oxide as a main component has a diameter of 0.05 to 5.0 mm. 3. The method according to claim 1, wherein the granular pigment is automatically added.
A method for producing an asphalt mixture, wherein the granular pigment is mixed with asphalt and aggregate by a mixer to obtain a colored asphalt mixture. 4. The method for producing an asphalt mixture according to claim 3, wherein the particulate pigment contains iron oxide as a main component and has a diameter of 0.05 to 5.0 mm. 5. The method according to claim 1, wherein the pigment particles are stored in a tank, the pigment is supplied to the tank by air pressure, and the pigment is supplied from the tank by a screw conveyor and mixed. The method for producing an asphalt mixture according to claim 3. 6. An asphalt supply means for supplying asphalt; an aggregate supply means for supplying aggregate; a pigment supply means for supplying pigment in the form of particles; asphalt supplied by the asphalt supply means; Aggregate supplied by the material supply means;
A mixer for mixing the pigment supplied by the pigment supply means; and a mixer for mixing the pigment supplied by the pigment supply means. 7. The pigment supply device according to claim 6, wherein said pigment supply means includes a tank for temporarily storing said particulate pigment, and supplies a required amount of pigment to said mixer from said tank. Asphalt mixture production equipment.