JP2000212908A - How to store pavement waste - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a storage method for effectively utilizing waste pavement. SOLUTION: A pavement waste material mixture preferably obtained by adding a binder to a pavement waste material is provided, and a surface protective layer is provided thereon to store the pavement waste material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing waste pavement, and more particularly to a method for reusing drainage waste pavement using a modified asphalt binder.

[0002]

2. Description of the Related Art Generally, asphalt pavement is maintained and repaired by peeling off the pavement and paving a new pavement.
In the past, old torn asphalt pavement was simply discarded in landfills and the like, but in recent years its recycling technology has been advanced and widely reused.
Recycling of pavement waste is usually performed by reusing it as a roadbed material or backing material, or by regenerating asphalt mixture. Asphalt mixture can be regenerated at the current position or at the plant, and the latter is the mainstream recently.

[0003] In recycling in a plant, usually, waste pavement is crushed to produce recycled aggregate, and a part of the new aggregate is replaced to produce a recycled asphalt mixture. Since the asphalt adhering to the recycled aggregate plays a part in the asphalt amount of the recycled asphalt mixture, the plant recycling method is an effective method for reusing pavement waste. By the way, there is an exception as to whether all asphalt pavement waste can be regenerated. Recently, drainage pavements having visibility and low-noise functions in addition to the running function have become widespread. However, it is difficult to regenerate waste materials from these pavements using current technology.

[0004] Drainable pavement is made by coarsening the particle size of aggregate so as to have voids. If conventional petroleum asphalt is used as a binder, its stability is not guaranteed. Is used as a binder). Modified asphalt binder is SBR, SBS, S
Rubber or thermoplastic elastomer such as IS is mixed into petroleum asphalt, and the binder does not soften easily even when the recycled aggregate is heated. Therefore, the modified asphalt adhering to the recycled aggregate has poor compatibility with the new aggregate and the new asphalt, and a regenerated asphalt mixture of a desired quality cannot be obtained.

[0005] While the drainage pavement is rapidly expanding, the situation where the technology for recycling the modified asphalt has not been developed is alarming, and it is necessary to separate the waste materials for storage. Issues such as the need to expand storage facilities are being generated.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention has established a technique for regenerating asphalt mixtures or recycles a more effective recycle method for reclaiming pavement waste generated from drainable pavements. Until the discovery of pavement, the main purpose of the present invention was to reduce the time and effort for separating paving waste materials and to curb capital investment in a recycled asphalt plant.

[0007]

SUMMARY OF THE INVENTION The present invention firstly relates to a method for laying pavement waste material and providing a surface protective layer thereon to store the pavement waste material. The second aspect of the present invention relates to a method for storing a pavement waste material in which a pavement waste material mixture obtained by adding a binder to a pavement waste material is provided and a surface protective layer is provided thereon. The third aspect of the present invention relates to a method for paving waste pavement material generated from asphalt drainage pavement, providing a surface protective layer thereon, and storing the pavement waste material. A fourth aspect of the present invention relates to a method for storing a pavement waste material in which the surface protective layer is a thin asphalt drainage pavement as described above.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the term "pavement waste material" means a pavement using a modified asphalt or petroleum resin as a binder and / or a flammable aggregate such as a thermoplastic aggregate such as plastic fiber or a rubber aggregate. Pavement waste material generated from asphalt pavement that is difficult to obtain the desired quality only by a heating method.
The pavement waste material is usually obtained by excavating a pavement body with an excavator. However, in the present invention, a cutting waste material generated by cutting with a cutting device is preferred. Cutting is performed by rotating the rotor with the cutting bit at high speed, by adjusting the shape of the cutting bit, the mounting position and angle of the cutting bit, the interval between the bits, the rotation speed of the rotor and the moving speed of the cutting device. In addition, the maximum particle size and the particle size of the cutting material can be made desired. The following table can be given as an example of a target example of the grain size of the cutting material.

[0009]

[Table 1]

[0010] In order to adjust the grain size as a target, the running speed of the cutting machine is preferably 10 to 20 m / min, and the cutting bit is preferably a conical, flat bit, fist bone bit or a combination of these. It is preferable that the bit is attached to the rotor so as to have an acute angle of 10 to 80 degrees, and it is preferable that the attachment density of the bit be 3 to 15 cm and the next collision. It is preferable to provide a simple spreader immediately after the rotor hood of the cutting machine. The pavement waste of the present invention is usually generated at the current position, but may be transported separately from a position or a stocking site. The lower layer when paving waste pavement transported separately from a location or a stocking site is preferably a concrete, cement stabilization layer or the like.

The pavement waste material is laid by a procedure in which the pavement waste material is spread and spread by a spreading device and compacted by a compaction device. Although it is possible to spread the pavement waste material as it is, it is preferable to add a binder such as asphalt, asphalt emulsion, petroleum resin, cement, lime, cement milk, lime milk to the pavement waste material, and to add an asphalt-based binder. Is more preferred.

As a method of adding the binder, a method of spraying the binder on the surface of the pavement and then crushing the pavement, a method of discharging the binder into the hood of the cutting rotor and mixing and adding simultaneously with the crushing of the pavement, There is a method in which a body is crushed to obtain a pavement waste material, which is supplied to a mixing device and mixed with a binder, or a method in which only the pavement waste material is first laid and the surface is impregnated with the binder. When using an asphalt-based binder, the method of or is preferred.

For the leveling of the paving waste material, a normal leveling device such as a bulldozer, a scraper, a motor grader, a base paver, an asphalt finisher, a concrete spreader, and a slip former is used, but the cutting device and the leveling device are integrated. Such a device can also be used. Rolling devices such as road rollers, tire rollers, vibrating rollers, and compacting devices such as flat vibrators and tampers can be used to compact the spread pavement waste, but when flatness is required for the surface protective layer, A rolling device is used.

The surface protection layer for protecting the pavement layer of the pavement waste material is intended to mix foreign substances such as water and dust into the pavement waste material, and includes asphalt pavement, concrete pavement, and resin pavement. Examples thereof include a spread rolling method, a pouring method, a sticking method, and a spraying method. The preferred surface protection layer of the present invention is a thin asphalt drainage pavement. Normal drainage pavements are typically constructed with a thickness of 4-6 cm, whereas thin asphalt drainage pavements are constructed with a thickness of 1-3 cm, typically around 2.5 cm. In the case of a thin drainage pavement, it is necessary to increase the adhesive force between the lower drainage pavement and the lower drainage pavement. In a normal drainage pavement, the amount of the applied adhesive is 0.2 to 0.41 / m ² . On the other hand, for a thin asphalt drainage pavement, 0.4-1.
It is necessary to spray 21 / m ² .

As the adhesive, asphalt, asphalt emulsion, tar, petroleum resin, natural resin, resin emulsion, cement paste, cement mortar can be used. Asphalt emulsion, particularly thermoplastic elastomer, is used for thin-layer asphalt drainage pavement. Alternatively, it is preferable to use a modified asphalt emulsion using a rubber alone or in combination.

As described above, it is preferable to use an asphalt finisher with an asphalt emulsion spraying device for the construction of a thin-layer asphalt drainage pavement in order to spray a larger amount of adhesive than a normal drainage pavement. The asphalt finisher equipped with an asphalt emulsion spraying device is equipped with an emulsion tank and a spray bar provided in front of the asphalt finisher spreading means in the running direction to keep the asphalt emulsion spray and the asphalt mixture spread at a fixed interval. It is what you do.

When an asphalt finisher with an asphalt emulsion spraying device is used, immediately after the asphalt emulsion has been sprayed, the asphalt mixture is placed on the surface where the asphalt emulsion is sprayed in a so-called uncured state. The decomposition of the asphalt emulsion is promoted by the heat of the heated asphalt mixture, so that the asphalt emulsion is prevented from flowing out after the asphalt emulsion is sprayed.As a result, a large amount of the asphalt emulsion can be sprayed, For the construction of a thin asphalt drainage pavement, it is preferable to use an asphalt finisher with an asphalt emulsion spraying device.

For compaction of the thin asphalt drainage pavement, a rolling device such as a load roller, a tire roller, and a vibration roller can be used as in the case of ordinary asphalt pavement.

[0019]

EXAMPLES Example 1: Crushing The asphalt drainage mixture is crushed by a cutting machine. The particle size after crushing was targeted at the particle size shown in Table 1, the traveling speed of the cutting machine was set at 15 m / min in order to adjust the particle size as a target, and a flat bit was used as the cutting bit. The bit was mounted on the rotor so that the mounting angle of the bit was acute with respect to the cutting surface. Supply to Mixing The spread paving waste was supplied to the mixer by a scraper. The pavement waste was supplied to a bucket conveyor in the center of the machine by a screw feeder, and from the bucket conveyor to a mixer via a belt conveyor. Mixing This mixing machine was connected to an asphalt lorry and was equipped with a screed device that spreads a pavement waste material mixture produced by mixing with asphalt formed in a mixer. The pavement waste material mixture became a pavement having an equivalent conversion coefficient of 0.65 to 1.0 due to the improvement of the particle size and the action of the asphalt binder. When particularly high stability was required for the pavement waste material mixture, modified asphalt was used as a binder. Spreading and Rolling After spread to a desired height with a screed, the pavement waste material mixture was compacted in the order of a vibration roller and a tire roller to construct a storage layer of the pavement waste material. Surface protective layer The maximum particle size of the thin layer asphalt drainage mixture was 5 to 13 mm, the binder was high-viscosity modified asphalt, and the adhesive to the storage layer was a modified asphalt emulsion.

Example 2: A mixture for abrasion and flow resistance using a modified asphalt type II as a binder was cut at a location A without particularly adjusting the particle size after crushing, and the cut material was cement stabilized at a location B. Transported up. At the place B, the transported waste pavement is spread to a predetermined height with a bulldozer and rolled with a roller. After that, 14 parts by weight of emulsion, 100 parts by weight of screenings, 1 part by weight of cement, and 9.5 parts by weight of water The resulting emulsion slurry was sprayed on the surface and allowed to penetrate. Then, a thin asphalt drainage mixture was paved. Site A was paved with a new modified asphalt type II mixture.

[0021]

As described above, according to the present invention, it is possible to store, at the current position, pavement waste material which requires a separation procedure and equipment investment and has not established a recycling technology, so that transportation costs, separation costs, and equipment costs related to storage of waste materials can be reduced. It can be significantly reduced. Also,
Since the surface protective layer is provided at the time of storage at the present position, the pavement waste material can be stored in a state where no foreign matter is mixed therein until a recycling technology is established, and can be immediately used as a raw material at the time of recycling.

When a binder is added to the pavement waste material, stability can be imparted to the storage layer of the pavement waste material, so that the entire storage body can be used as a road surface for vehicle traveling together with the surface protection layer. This will reduce road maintenance costs. That is, the normal road surface maintenance is to repeatedly perform the cutting overlay, but in the present invention, the first road surface maintenance is storage of the pavement waste material, and the second road surface maintenance is the cutting overlay for removing the storage layer. . In the present invention, it is possible to construct a storage medium equivalent to a cutting overlay, so that it is possible to consider the same time period until the second road surface maintenance, and eventually compare the first maintenance cost. This is a comparison of the two, but the present invention provides for lower maintenance costs because the cost of transporting the cutting material to the plant, purchasing and transporting the new mixture is eliminated.

Further, in the case of storing the pavement waste material of the asphalt drainage pavement, when the storage body is constructed for cutting by adjusting the maximum particle size and the particle size, it is far more than the original drainage pavement. A small porosity can be ensured, and the new road surface height combined with the surface protection layer can be made not to significantly differ from the original road surface height.

In the case of constructing a thin asphalt drainage pavement on the surface protective layer, the above-mentioned new standard road surface height can be further adjusted, and if the original pavement is a drainage pavement. This makes it possible to maintain the function continuously and, if the original pavement does not have a drainage function, newly provide the drainage function at low cost.

As described above, according to the present invention, it is possible to efficiently recycle even if the technology for reusing the pavement has not been established, and to conserve resources and easily maintain pavement stock. Play.

Claims (4)

[Claims] 1. A method for storing waste pavement, comprising paving waste pavement and providing a surface protective layer thereon. 2. A method for storing waste pavement, comprising: laying a waste pavement mixture in which a binder is added to waste pavement, and providing a surface protective layer thereon. 3. The pavement waste storage method according to claim 1, wherein the pavement waste is a pavement waste generated from an asphalt drainage pavement. 4. The method for storing waste pavement according to claim 1, wherein the surface protective layer is a thin-layer asphalt drainage pavement.