JP2000027105A - Paving construction and working method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paving construction wherein rubber grains projected out from the surface of pavement so as to prevent freezing of the road surface are not embedded below the pavement surface, and a paving construction which can be easily worked as well as a construction method for forming the paved construction easily and efficiently. SOLUTION: By emulsifying a modified asphalt by mixing asphalt with an asphalt modifier, or by producing a modified asphalt emulsion 15a by emulsifying asphalt and asphalt modifier at once, and normal temperature slurry material 18 containing at least some of modified asphalt emulsion 15a, robber grains 16, cement, water crushed stones and sand. Then, by laying normal temperature slurry 18, and then a pavement construction is formed which contains at least some of modified asphalt 15A, rubber particles 17, cement, water, crushed stone 16 and sand which ware created by the decomposition of the modified asphalt emulsions in the normal temperature slurry material 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement structure and a construction method thereof.

[0002]

2. Description of the Related Art As a means for reducing noise when driving a car or preventing freezing on a pavement surface in a cold region, a slurry material containing a mixture of asphalt, filler and rubber particles is applied to an existing pavement surface. A laying method (Japanese Patent Laid-Open No. 10-110402) is known.

In this method, a surface material such as asphalt pavement or cement concrete pavement as a base material is subjected to surface treatment using a slurry material composed of asphalt, filler, and rubber particles. Mixing is performed by a mixer, a goose cooker that transports the slurry material, a goose finisher that lays the slurry material, and a heater that keeps and heats the slurry material and the pavement surface serving as a base.

[0004]

However, according to the pavement structure in which the base pavement is surface-treated using the above-mentioned conventional slurry material composed of asphalt, filler and rubber particles, the rubber particles are dispersed throughout the surface treatment layer. The ice that mixes and protrudes from the surface of the treated layer and covers the pavement surface during the winter, such as in winter, is divided into small sections, and the ice applied to the ice surface can be easily broken by traffic loads. However, there is no material that supports the rubber particles in the slurry material, and when the vehicle actually starts operating and a load is applied to the pavement surface after construction, the asphalt And rubber particles are buried in filler bitumen comprising the filler and the filler.

[0005] As a result, unevenness of the pavement surface is reduced and smoothed, so that the above-mentioned effects of preventing icing and reducing noise are lost. Therefore, once the rubber particles are buried and lose their function,
The meaning of the surface treatment is reduced, and it may be necessary to perform re-construction, which has a large adverse effect on cost.

When laying a conventional slurry material composed of asphalt, filler and rubber particles, first,
It is necessary to carry out a mixing operation at a high temperature (150 ° C. or higher) for a certain period of time in order to obtain sufficient fluidity for laying, and this high temperature must be maintained even when laying the mixed slurry material on a pavement surface.

[0007] Therefore, appropriate temperature control is required, and the work requires skill. In addition, a special machine for each work such as an asphalt plant (primary mixing), a cooker (secondary mixing), and a dedicated laying device is provided. In addition, it is necessary to equip with heaters, which leads to an increase in equipment costs, and in addition to the fact that construction is often required in a small construction area in recent years, many machines must be operated and machines must be replaced every work. It is inevitable that the construction will be complicated, such as not being done.

Accordingly, the present invention has been made in view of such a conventional problem, and a pavement structure in which rubber particles for preventing road surface freezing and the like are prevented from being buried from the pavement surface by protruding from the pavement surface. It is another object of the present invention to provide a construction method capable of simply and efficiently constructing such a pavement structure.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and emulsifies modified asphalt obtained by mixing asphalt and an asphalt modifier, or asphalt and asphalt modification. The modified asphalt emulsion is produced by emulsifying the raw material at once, and a room temperature slurry material containing such modified asphalt emulsion, rubber particles, cement, water, crushed stone and at least one of sand is produced. And laying the room temperature slurry material.

[0010] The pavement structure formed by the above-described laying method may include a modified asphalt obtained by decomposing a modified asphalt emulsion, rubber particles, cement, water, and at least one of the crushed stone and sand. And at least one of crushed stone and sand supports the rubber particles.

In the construction method of the present invention, if the above-mentioned room temperature slurry material is laid by a laying device as described later in the embodiment, for example, a series of steps from mixing of the room temperature slurry material to transportation and laying is performed. The process can be carried out consistently with a single machine, which increases the cost of equipment and complicates construction work, in which a large number of machines must be operated in a small construction area and replaced every time. Can be eliminated. This makes the construction much simpler and more efficient.

Further, since it is not necessary to work the slurry at room temperature in the present invention while maintaining the temperature at the time of laying, when laying the slurry as in the prior art, it is necessary to keep the slurry at a high temperature in order to obtain fluidity as much as possible. It is necessary to maintain the high temperature when laying the mixed slurry material on the pavement surface for the time mixing work, and for that, asphalt plant (primary mixing), cooker (secondary mixing),
The problem that a dedicated machine and a heater must be provided for each operation, such as a dedicated laying device, and the problem that the skill such as temperature management requires skill and is complicated at the same time are solved.

Further, according to the pavement structure of the present invention, rubber particles are mixed in the pavement structure and the rubber particles protrude from the pavement surface. Of course, rubber particles can be reduced due to the fact that the room temperature slurry material forming the pavement structure is mainly a mixture of a modified asphalt emulsion and at least one of crushed stone and sand. In addition, the modified asphalt emulsion is decomposed, and the modified asphalt emulsion is decomposed to have a high-viscosity modified asphalt having excellent properties such as abrasion resistance. Even when a traffic load is applied to the surface, the rubber particles do not become buried, and a predetermined icing prevention and noise reduction effect can be maintained.

It is not necessary to maintain the slurry material at a high temperature. Mixing, transportation, and laying are performed at room temperature. It can reduce the generation of carbon dioxide and contribute to solving environmental problems such as global warming.

[0015]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a pavement structure according to the present invention.

The pavement structure 10 according to the present embodiment includes a base pavement 13 composed of coarse aggregate 11 and asphalt mortar 12, and a room temperature slurry material 1 on the surface of the base pavement 13.
8 and a surface treatment layer 14 formed by adhering.

The asphalt mortar 12 contains fine aggregate, stone powder as a filler, and asphalt as a binder. The asphalt mortar 12 fills the space between the coarse aggregates 11 in the base pavement 13 to form a main body of the base pavement 13. It is what makes.

The surface treatment layer 14 formed on the surface of the base pavement 13 is formed by laying and attaching a room temperature slurry material 18 to the base pavement 13, and the room temperature slurry material 18 is used as a binder. Asphalt mortar 15 mainly composed of a modified asphalt emulsion 15a and fine aggregate 15b (2.5 mm or less in particle size), crushed stone 16 (5 mm or less in particle size) and rubber particles 17
(A particle size of 5 mm or less). In the present embodiment, the surface treatment layer 14 has 5
It is formed with a thin layer of about 20 mm.

The modified asphalt emulsion 15a, which is a main component of the asphalt mortar 15, is obtained by emulsifying modified asphalt obtained by mixing asphalt and asphalt modifier, or asphalt and asphalt modifier. It is produced by emulsifying at once, and generally, straight asphalt and rubber such as natural rubber or styrene / butadiene rubber as asphalt modifier, styrene / butadiene block polymer or vinyl acetate copolymer, etc. Modified asphalt emulsions are known in which a thermoplastic elastomer is used alone or a rubber / thermoplastic elastomer to which both are added is emulsified.

In the present embodiment, the compounding ratio of the rubber particles 17 in the room temperature slurry material 18 depends on the elasticity of the pavement structure after laying, the workability of the room temperature slurry material 18 and the surface shape. It is preferable that the weight ratio be about 2 to 20%.

The rubber particles 17 have desired elasticity,
When the room temperature slurry material 18 is laid and adhered on the surface of the base pavement 13, various kinds of rubber particles having a particle diameter such that all or a part of the particles protrude on the pavement surface are used. However, it is preferable to use rubber particles having a particle size of about 5 mm or less, for example. Also,
The rubber particles 17 in the present invention contain urethane resin particles obtained by molding a urethane resin having the same elastic properties as rubber as equivalents.

According to the pavement structure of the present invention, since the rubber particles 17 are mixed in the room temperature slurry material 18 forming the surface treatment layer 14 and the rubber particles 17 protrude from the pavement surface, freezing of the road surface is performed in the same manner as the conventional one. It is possible to prevent noise and reduce noise when the vehicle is running.
Is mainly a mixture of crushed stone 16 and modified asphalt emulsion 15a, so that rubber particles 17 are supported by crushed stone 16 and are further decomposed by modified asphalt emulsion 15a to obtain high viscosity and excellent resistance to The modified asphalt 15A having properties such as abrasion properties firmly supports and supports each other, so that even when the vehicle is started to be used and a traffic load is applied to the pavement surface, the rubber particles 17 are not buried and have a predetermined shape. The effects of preventing icing and reducing noise can be maintained.

Even when the rubber particles 17 protruding from the surface of the surface treatment layer 14 are worn and the icing prevention effect is reduced, the room temperature slurry material 18 can be re-installed without removing the base pavement 13. The surface treatment layer 14 can be easily repaired, and the surface treatment layer 14 can be formed with the room temperature slurry material 18 according to the present invention, even if the pavement is in a variety of states, regardless of whether the pavement is new or existing. Can easily be improved to have the following characteristics.

In addition, if the room temperature slurry material 18 is laid and adhered so as to fill the rough recesses on the pavement surface, it is possible to prepare a rut or the like on the pavement surface.

Further, if the surface treatment layer 14 is formed on the surface of the sidewalk pavement as described above, the elasticity of the rubber particles 17 can be added to improve walking comfort.

In the present invention, the base pavement 13 is applicable not only to ordinary asphalt pavement but also to cement concrete pavement.

Further, in the pavement structure of the present embodiment,
Although the rubber particles 17 are supported by the crushed stone 16, the invention is not limited thereto, and the rubber particles 17 may be supported by a mixture of the crushed stone 16 and sand or only the sand.

Next, FIGS. 2A and 2B show an apparatus for constructing a pavement structure according to the present embodiment.

The pavement construction device 19 suitable for constructing the pavement structure of the present invention is of a truck-mounted type in this embodiment to enable the movement of the construction device. An emulsion tank 20 for storing and measuring the asphalt emulsion 15a, and a water tank 21 for storing and measuring water essential for mixing,
Subsequently, a crushed stone hopper 22 for storing and measuring the crushed stones 16 mixed in the room temperature slurry material 18 is provided at the center of the bed, and subsequently, the cement mixed into the room temperature slurry material 18 is stored and measured at the rear of the bed. Cement tank 23
And a rubber particle tank 24 for storing and measuring the rubber particles 17. Note that each of these tanks is provided with a transporting and feeding device such as a pressure feeding device and a hopper together with the storage and weighing function.

A mixer 26 for kneading various mixed materials supplied from the tanks is provided at the rear end of the truck, and an additive tank 25 for supplying various additives is provided in addition to the mixer 26. Also, this mixer 2
The mixer 26 is movably mounted on a diagonally lower road surface of the mixer 6.
A spreader box 27 is provided to spread the supplied normal temperature slurry material 18 on the road surface.

As a construction procedure, first, the above-mentioned various materials are sufficiently loaded in the tank of the pavement construction apparatus 19 and moved to the construction area. Next, in order to mix the room temperature slurry material 18 to be laid, the emulsion tank 20, the rubber particle tank 24, the cement tank 23, and the water tank 21 are operated, and the mixer is discharged from each tank while weighing according to a preset laying amount. 26, the modified asphalt emulsion 15a, rubber particles 17, cement, and water are supplied by a pumping device. Subsequently, the crushed stone 16 is conveyed from the crushed stone hopper 22 through the crushed stone feeder 28 onto the belt conveyor 29 as shown in FIG. Will be thrown into.

In the mixer 26, the modified asphalt emulsion 15a, the rubber particles 17, the crushed stone 16, and the cement are supplied to the mixer 26 by rotating the spirally provided mixer plate 26a at an appropriate rotation speed. , Water, additives, and the like are kneaded, and the respective materials are uniformly mixed without bias. The room temperature slurry material 18 generated as a result of the kneading operation is discharged from a mixer gate 26b provided at the rear of the mixer 26 and supplied to a spreader box 27.

The spreader box 27 is provided with a rotatable laying roller and the like, and the room temperature slurry material 18 supplied from the mixer 26 is spread on the road surface while being appropriately stirred, and is spread on a pavement road surface. 14 is formed. At that time, in order to adjust the laying thickness of the surface treatment layer 14, the laying amount is adjusted by a thickness adjusting device 27a provided at the rear of the mixer 26. During the curing, the modified asphalt emulsion 15a in the laid room temperature slurry material 18 is decomposed into the modified asphalt 15A.

For example, if the laying operation is performed by the pavement construction apparatus 19 in the above-described embodiment, a series of steps from mixing of the room temperature slurry material 18 to transportation and laying can be performed consistently by a single machine. It is possible to solve problems such as an increase in cost for equipment and a complicated construction in which many machines are operated in a small construction area and the machines have to be replaced for each operation. This makes the construction much easier and more efficient than in the past.

Therefore, as before, asphalt plant (primary mixing), cooker (secondary mixing), special laying device,
The problem of having to provide a dedicated machine and a heater for warming and heating for each work, such as the above, has been solved, and the problem of the need for skill in the temperature management work of pavement materials and the accompanying complexity at the same time has also been solved. Is done.

The room temperature slurry material 18 of the present invention
It is not necessary to maintain the slurry material at a high temperature as in the past, and the mixing, transportation and laying of the slurry material are performed at room temperature, so the carbon dioxide generated by heating the slurry material to a high temperature , Etc., and can contribute to solving environmental problems such as global warming.

Here, in this embodiment, the moving means of the pavement construction device 19 is a truck, but is not limited thereto.
It is assumed that various tanks, supply equipment, mixers, and the like can be appropriately used as long as they can be loaded.

Further, in this embodiment, the crushed stone hopper 22 and various feeding devices following the crushed stone hopper 22 for storing and supplying the crushed stone 16 are shown. However, when sand is used instead of the crushed stone 16, the sand What is necessary is just to select a storage supply apparatus suitably, and when mixing and using the crushed stone 16 and sand, it is suitable to provide the apparatus which can handle crushed stone and sand simultaneously.

[0040]

As described in detail above, in the construction method of the present invention, if the above-mentioned room temperature slurry material is laid by the laying device as described in the embodiment, for example, A series of processes from mixing, transportation, and laying can be performed consistently on a single machine.In addition to increasing equipment costs, many machines are operated in a narrow construction area and machines are replaced every time Problems such as the complicated construction that must be performed can be solved. This makes the construction much simpler and more efficient.

Further, since it is not necessary to keep the temperature of the room temperature slurry material of the present invention at a high temperature at the time of laying, when laying the slurry material as in the prior art, it is necessary to maintain a constant temperature at a high temperature in order to obtain fluidity as much as possible. It is necessary to maintain the high temperature when laying the mixed slurry material on the pavement surface for the time mixing work, and for that, asphalt plant (primary mixing), cooker (secondary mixing),
The problem that a dedicated machine and a heater must be provided for each operation, such as a dedicated laying device, and the problem that the skill such as temperature management requires skill and is complicated at the same time are solved.

Further, according to the pavement structure of the present invention, rubber particles are mixed in the pavement structure and the rubber particles protrude from the pavement surface. Of course, it is possible to reduce the amount of rubber particles because the room temperature slurry material forming the pavement structure is mainly a mixture of a modified asphalt emulsion and at least one of crushed stone and sand. In addition, the modified asphalt emulsion is decomposed, and the modified asphalt emulsion is decomposed to have a high-viscosity modified asphalt having excellent properties such as abrasion resistance. Even when a traffic load is applied to the surface, the rubber particles do not become buried, and a predetermined icing prevention and noise reduction effect can be maintained.

The above-mentioned room temperature slurry material is as follows:
It is not necessary to maintain it at a high temperature. Mixing, transportation, and laying are performed at room temperature, so it is possible to reduce the generation of carbon dioxide gas such as carbon dioxide generated by heating the slurry material to a high temperature. It can also contribute to solving environmental problems such as global warming.

[Brief description of the drawings]

FIG. 1 is an enlarged partial cross-sectional view illustrating a configuration of a pavement structure according to an embodiment.

FIG. 2A is an explanatory view showing a construction apparatus used in the construction method of the present embodiment, and FIG. 2B is an enlarged sectional view of a mixer and a spreader box in the construction apparatus.

[Explanation of symbols]

 10 Pavement Structure 13 Base Pavement 14 Surface Treatment Layer 15a Modified Asphalt Emulsion 15A Modified Asphalt 16 Crushed Stone 17 Rubber Particles 18 Room Temperature Slurry Material 19 Pavement Construction Equipment 20 Emulsion Tank 21 Water Tank 22 Crushed Stone Hopper 23 Cement Tank 24 Rubber Particle Tank 26 Mixer 27 Spreader box

Claims (2)

[Claims] 1. A modified asphalt emulsion is formed by emulsifying a modified asphalt obtained by mixing asphalt and an asphalt modifier, or emulsifying asphalt and an asphalt modifier at once. A method for constructing a pavement structure, comprising: generating a room temperature slurry material containing a porous asphalt emulsion, rubber particles, cement, water, at least one of crushed stone and sand, and laying the room temperature slurry material. 2. A modified asphalt containing a modified asphalt emulsion obtained by decomposing a modified asphalt emulsion, rubber particles, cement, water, at least one of crushed stone and sand, wherein at least one of the crushed stone and sand is the rubber. Pavement structure characterized by supporting particles.