JP7330659B1 - Manufacturing method and manufacturing equipment for small block asphalt mixed material stored at room temperature - Google Patents

Abstract

Kind Code: A1 A method for producing a small block asphalt mixed material which is stored at room temperature and which has a relatively small diameter and a uniform particle size and is prevented from agglomeration during storage is provided. SOLUTION: A nodule-forming step of finely dividing a hot asphalt mixture (9), which is a mixture of molten asphalt and aggregate, into small asphalt nodules (9b), and ) is washed and cooled in a water tank (4) containing a surfactant, and the asphalt small lump (9c) after the washing and cooling process is drained, mixed with stone powder, and coated with stone powder. , a stone powder coating step to obtain a nodular asphalt mixed material (9e), which is asphalt nodules coated with stone powder, to produce a nodular asphalt mixed material. [Selection drawing] Fig. 1

Description

The present invention relates to a manufacturing method and a manufacturing apparatus for a small block asphalt mixed material which is stored at room temperature in the form of granules or small blocks, and which is heated and paved at the time of pavement repair work.

When repairing a paved road surface that has deteriorated due to holes, partial peeling, etc., it is possible to use an asphalt mixture material that is stored at room temperature in the form of small blocks. Asphalt mixed material stored at room temperature in the form of small lumps, for example, as proposed in Patent Document 1, a hot asphalt mixture that is a mixture of molten asphalt and aggregate is subdivided, cooled in a water tank, Obtained by drying. Then, if necessary, as proposed in Patent Document 2, the nodular asphalt mixture is coated with a powder such as tankal. Such a small block asphalt mixed material stored at room temperature is heated during pavement repair. Then, the asphalt adhering around the aggregate melts. Pave the parts where holes and peeling are formed on the paved road surface.

If so-called modified asphalt containing rubber, synthetic resin, etc. is used as the asphalt, a small block-shaped asphalt mixed material imparted with elasticity can be obtained. Such nodular asphalt mixtures are useful in paving in places where stretchability of the pavement is required, such as bridges and the like.

Japanese Patent No. 4817085 JP-A-6-41906

A small block asphalt mixed material that is granular and stored at room temperature is excellent because it can be used from a small amount. However, there are also issues to be resolved. Specifically, there are two problems. The first problem is that the produced small block asphalt mixed material does not have a uniform particle size and contains large lumps. The second problem is that small blocks of asphalt mixed material stick to each other and form lumps during storage. If powder such as tancal is coated, it is possible to prevent the bonding of the asphalt mixed materials in the form of small lumps to some extent. However, when the storage environment becomes relatively hot, the small pieces of asphalt mixture material stick together to form large clumps. Agglomerated asphalt mix material is difficult to use.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing a small block asphalt mixture material that is stored at room temperature and that has a relatively small and uniform particle size and is prevented from agglomerating during storage.

SUMMARY OF THE INVENTION The present invention is directed to a process for producing an ambient temperature stored nodular asphalt mixture material which is stored at ambient temperature in the form of granules or nodules and is heated during construction. The production method of the present invention includes a step of breaking up a hot asphalt mixture, which is a mixture of molten asphalt and aggregate, into small lumps of asphalt into small lumps of asphalt; A washing/cooling process in which the asphalt slugs are dropped into a water tank containing a surfactant containing ethylene alkyl ether as a main component, washed and cooled in the water tank, and after the washing/cooling process, the asphalt small lumps are drained and mixed with stone powder. a stone powder coating step of mixing and coating with stone powder to obtain a nodular asphalt mixed material, which is asphalt nodules coated with stone powder.

According to the present invention, since the washing and cooling process includes washing and cooling hot asphalt spherules in a water tank containing a surfactant containing polyoxyethylene alkyl ether as a main component , the asphalt spherules can be Oil on the surface is properly removed. Appropriate surface oil removal prevents the formation of large-sized agglomerates by bonding together during manufacture. In other words, the particles have relatively small diameters and uniform particle diameters. Then, the asphalt small lumps from which the oil content on the surface has been removed are coated with stone powder by a stone powder coating process to obtain an asphalt mixed material in the form of small lumps. Therefore, even if the small-sized asphalt mixed material is stored in a relatively high-temperature environment, the small-sized asphalt mixed material is prevented from being bonded to each other and agglomerated.

1 is a front view showing an apparatus for producing a small block asphalt mixed material according to the present embodiment; FIG. 4 is a photograph of a small block asphalt mixed material produced by the production method according to the present embodiment. 4 is a photograph of a small block asphalt mixed material produced by a production method according to a comparative example. 4 is a photograph of a small block asphalt mixed material produced by the production method according to the present embodiment after a high-temperature environment storage test. 10 is a photograph of a small block asphalt mixed material produced by a production method according to a comparative example after a high-temperature environment storage test.

This embodiment will be described. As shown in FIG. 1, the apparatus 1 for manufacturing a small lump asphalt mixed material according to the present embodiment includes a small lump forming device 3, a water tank 4, a stone powder coating device 5, a bagging device 7, It has

<Lump reduction device>
The small lump forming device 3 is composed of a hopper 10 in which an asphalt mixture 9, which is a mixture of molten asphalt and aggregate, is put, and a net body 11 provided below the hopper 10. As shown in FIG. Although the hopper 10 may be stationary, it may be vibrated by providing a predetermined vibrating means so that the asphalt mixture 9 drops onto the net body 11 efficiently. The net body 11 is formed with meshes of a predetermined size according to the particle size of the small block asphalt mixed material to be finally obtained. Such a mesh 11 is adapted to be vibrated by vibrating means (not shown). As will be described later, the net body 11 subdivides the asphalt mixture 9a to obtain small asphalt small lumps 9b, 9b, . . . Although not shown in the drawing, a gas burner or the like may be provided in the vicinity of the mesh 11 to heat the asphalt mixture 9a on the mesh 11. FIG.

<Water tank>
A water tank 4 is provided below the net body 11 to wash and cool the asphalt small lumps 9b, 9b, . . . The water 13 contained in the water tank 4 contains a surfactant. As the surfactant, a surfactant containing polyoxyethylene alkyl ether as a main component is used in the present embodiment. A surfactant containing polyoxyethylene alkyl ether as a main component has a relatively high clouding point, which is the temperature at which the surfactant separates from water, and provides stable detergency even at high temperatures. Although not shown in FIG. 1, the water tank 4 may be provided with a supply port and a discharge port and connected to a cooling device such as a chiller. By doing so, the water 13 in the water tank 4 can be circulated while being cooled by the chiller.

The water tank 4 is provided with a belt conveyor, that is, a first carrying-out means 15 for carrying out the asphalt small lumps 9c, 9c, . . . there is Since the asphalt small lumps 9c, 9c, .

<Stone powder coating equipment>
The stone powder coating device 5 is provided downstream of the first carry-out means 15, and drained asphalt small lumps 9d, 9d, . . . The stone powder coating device 5 includes a stone powder supply unit 17 for supplying stone powder such as tankal, and a stirring means 18 composed of a rotating screw. The asphalt slugs 9d, 9d, . . . will be coated with stone dust as will be explained later.

<Bagging device>
The stone powder coating device 5 is provided with a second carrying-out means 20 for carrying out the asphalt small lumps coated with stone powder, that is, the small lump-shaped asphalt mixed materials 9e, 9e, . . . there is The bagging device 7 is equipped with a hopper 21, and packs the asphalt mixed materials 9e, 9e, . . .

<Method for producing small block asphalt mixed material>
A method for manufacturing a small block asphalt mixed material according to the present embodiment, which is performed using the apparatus 1 for manufacturing a small block asphalt mixed material according to the present embodiment, will be described. The nodulation step is performed first. That is, an asphalt mixture 9, which is a mixture of melted asphalt and aggregates, is charged into the hopper 10 of the compacting device 3. As shown in FIG. Although general asphalt can be used as asphalt, modified asphalt containing rubber and having elasticity is used as asphalt in the present embodiment. Therefore, the finally produced nodular asphalt mixed material can be used as an elastic pavement material for repairing paved road surfaces such as bridges. The asphalt mixture 9 is discharged little by little from the hopper 10 and falls on the net body 11 . The asphalt mixture 9a is finely divided by vibrating the mesh 11. As shown in FIG. That is, asphalt small lumps 9b, 9b, . . .

Next, a washing/cooling process is performed. That is, asphalt small lumps 9b, 9b, . . . The asphalt slugs 9c, 9c, . . . are washed and cooled by water 13 containing surfactant. Since the surfaces of the small asphalt blocks 9c, 9c, . . . As a result, the bonding between the asphalt slugs 9c, 9c, . . . is inhibited. That is, the small asphalt lumps 9c, 9c, . . . are maintained in a small diameter state. Next, a draining step is performed. Specifically, the washed and cooled asphalt small lumps 9c, 9c, . . . As a result, the asphalt slugs 9c, 9c, . . . are drained.

Next, a stone powder coating process is performed. Namely, the water-drained asphalt small lumps 9d, 9d, . Then, the surfaces of the asphalt small lumps 9d, 9d, . . . are coated with stone powder. The asphalt small lumps coated with stone powder, that is, the small asphalt mixed materials 9e, 9e, . Small lumps of asphalt mixed material 9e, 9e, . . .

<Experiment 1>
In the method of manufacturing the small asphalt mixed material according to the present embodiment, the asphalt small lumps 9c, 9c, . In order to investigate the influence of the presence or absence of the surfactant on the particle size of the finally obtained small-sized asphalt mixed material 9e, 9e, .
Experiment 1A: A predetermined amount of "Banrise D-20S" manufactured by Joban Kagaku Kogyo Co., Ltd. was used as a surfactant in water tank 4, and water 13 was added and mixed. A small block asphalt mixed material was obtained by carrying out the method for producing a small block asphalt mixed material according to the present embodiment described above. Hereinafter, this is referred to as a small block asphalt mixed material according to an example. A photograph of a nodular asphalt mixed material according to an example is shown in FIG. 2A.
Experiment 1B: No surfactant was added to the water 13 in the water tank 4 . I just added water. In this state, a small block asphalt mixed material was obtained using the small block asphalt mixed material manufacturing apparatus 1 . This is hereinafter referred to as a small block asphalt mixed material according to a comparative example. A photograph of the nodular asphalt mixed material according to the comparative example is shown in FIG. 2B.
Consideration: The nodule-shaped asphalt mixed material according to the example had a relatively small diameter and a uniform particle size. On the other hand, some of the small block asphalt mixed materials according to the comparative examples had large particle sizes, and the particle sizes were non-uniform. By washing and cooling the asphalt small lumps 9c, 9c, . . . It was confirmed that an asphalt mixed material was obtained.

<Experiment 2>
An experiment was conducted to investigate how the presence or absence of a surfactant in the washing/cooling process affects the agglomeration of the resulting small asphalt mixed material during storage in a high-temperature environment.
Experiment 2: The small lump-shaped asphalt mixed material according to the example obtained in Experiment 1 and the small lump-shaped asphalt mixed material according to the comparative example were packed in separate waterproof bags and sealed. These were submerged in a constant temperature bath with a water temperature of 60° C. and left under a pressure of 10 kPa. This pressure corresponds to the pressure applied to the small lump asphalt mixture material in the lowermost bag when 10 bags of the small lump asphalt mixture material containing 20 kg are piled up.
Experimental result: The particle size of the small-sized asphalt mixed material according to the example was kept constant without bonding between the small-sized asphalt mixed materials even after 24 hours. The nodular asphalt mix according to the example after 24 hours is shown in the photograph of FIG. 3A. On the other hand, in the small block asphalt mixed material according to the comparative example, the small block asphalt mixed material bonded to each other after 6 hours and formed agglomerates. An agglomerated comparative example nodular asphalt mixture material is shown in the photograph of FIG. 3B.
Consideration: If the water 13 containing a surfactant is used for washing and cooling in the washing and cooling process, the obtained small block asphalt mixed material is prevented from clumping during storage even in a relatively high temperature environment. It was confirmed that

1 Small Lump Asphalt Mixed Material Manufacturing Apparatus 3 Small Lump Forming Device 4 Water Tank 5 Stone Powder Coating Device 7 Bagging Device 9, 9a Asphalt Mixture 9b, 9c, 9d Asphalt Small Lump 9e Small Lump Asphalt Mixed Material 10 Hopper 11 Net Body 13 Water 15 First carry-out means 17 Stone powder supply unit 18 Stirring means 20 Second carry-out means 21 Hopper 23 Bag

Claims (3)

A method for manufacturing a small block asphalt mixed material stored at room temperature, which is stored at room temperature in granular or small block form and is heated during construction,
The manufacturing method includes a nodule-forming step of breaking up a hot asphalt mixture, which is a mixture of molten asphalt and aggregate, into small asphalt nodules;
a washing/ cooling step in which the hot asphalt slugs are dropped into a water tank containing a surfactant containing polyoxyethylene alkyl ether as a main component, washed and cooled in the water tank;
a draining step of draining the asphalt small lumps after the washing/cooling step;
a stone powder coating step of mixing the drained asphalt small lumps with stone powder and coating with stone powder to obtain a small lump-shaped asphalt mixed material that is asphalt small lumps coated with stone powder; A method for producing a nodular asphalt mix material. 2. The method for producing a small block asphalt mixed material that can be stored at room temperature according to claim 1 , wherein the asphalt is modified asphalt containing rubber and having elasticity. A production apparatus for asphalt mixed material stored at room temperature, which is stored at room temperature in the form of granules or small lumps and is heated during construction,
The manufacturing apparatus includes a small-lump-forming device that pulverizes a high-temperature asphalt mixture composed of molten asphalt and aggregate into asphalt slugs, which are asphalt in the form of small lumps;
a water tank provided below the nodule forming device, in which the high-temperature asphalt nodules fall and are washed and cooled ;
Draining means for carrying out and draining the asphalt small lumps from the water tank;
a stone powder coating device for obtaining a small asphalt mixed material by adding stone powder to the asphalt small lumps drained by the draining means and coating the asphalt small lumps,
An apparatus for producing a small block asphalt mixed material stored at room temperature, wherein the water tank contains a surfactant containing polyoxyethylene alkyl ether as a main component .

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