JP2001262504A - Method of manufacturing asphalt mixture and method of constructing asphalt pavement body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for efficiently constructing a functional pavement body. SOLUTION: Before the stamping of asphalt mixture is completed after the completion of manufacture thereof, functional aggregate and, as requested, binder are added to and mixed with the asphalt mixture. The lower layer of a pavement body is formed of the former asphalt mixture, and the upper layer thereof is formed of the latter functional asphalt mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a functional asphalt mixture containing a rubber aggregate, a glass aggregate, a color aggregate and the like, which separately imparts a function to asphalt pavement, and a functional asphalt using the asphalt mixture. The present invention relates to a method and an apparatus for constructing a pavement.

[0002]

2. Description of the Related Art Asphalt pavements made of functional aggregates such as rubber aggregates, glass aggregates, and color aggregates for the purpose of adding functions such as low noise effect, improved visibility, and suppression of rise in pavement surface temperature. Scattering on the surface has been done.
As a method of dispersing the functional aggregate on the asphalt pavement surface, a method of press-fitting the functional aggregate to the asphalt pavement surface, a method of attaching the functional aggregate to the asphalt pavement surface with an adhesive (binder), A method for paving an asphalt mixture containing a functional aggregate is known.

A typical example of a method for press-fitting a functional aggregate into the surface of an asphalt pavement is a roll door asphalt method, in which after a heated asphalt mixture is spread, the asphalt mixture is subjected to a bleach coating process while the asphalt mixture is not yet cured. Aggregate is scattered and pressed with a roller to form a pavement. In rolled asphalt, a pavement body is provided with functions such as slip resistance, crack resistance and abrasion resistance by using a pre-coated aggregate of No. 6 crushed stone or more.

[0004] A method of attaching a functional aggregate to the surface of an asphalt pavement with an adhesive is to use a resin such as asphalt, asphalt emulsion, epoxy, acrylic, urethane or the like as an adhesive to harden the functional aggregate into an asphalt pavement. It is applied and fixed on the surface. Those using asphalt as an adhesive are also called surface treatment, and those using resin as an adhesive are also known as neat construction methods, which are used to improve slip resistance and aesthetic appearance, but other glass aggregates and transparent resin The use of adhesives has also been used to enhance visibility.

[0005] The method of paving an asphalt mixture containing a functional aggregate can be regarded as using the asphalt mixture as an adhesive in the above-mentioned attaching method, but using an asphalt mixture produced by adding a functional aggregate. Thus, a functional asphalt pavement in which functional aggregates are scattered in the asphalt pavement is obtained.

[0006] The functional asphalt pavement has the above-mentioned 2
Compared to the construction method, although it is extremely effective in suppressing the separation of functional aggregates, it is difficult to reduce the thickness to less than twice the aggregate maximum particle size because the asphalt mixture is spread evenly. Therefore, there is a disadvantage that the functional aggregate must be used more than necessary, and the economical efficiency is inferior to the above two methods.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a rubber aggregate,
A method for producing a functional asphalt mixture and a functional asphalt using the same to provide a low-cost functional asphalt pavement to which functions are imparted by functional aggregates including glass aggregates and color aggregates An object of the present invention is to provide a method for constructing a pavement.

[0008]

SUMMARY OF THE INVENTION The present invention firstly comprises adding a functional aggregate and optionally a binder to a part of the asphalt mixture after completion of the asphalt mixture and before compaction is completed. A method for producing a functional asphalt mixture. Secondly, after the asphalt mixture is spread and leveled, a functional aggregate and a binder are added to the surface layer of the asphalt mixture, and at least the asphalt mixture of the surface layer is mixed with the functional material and a binder present as desired. After that, this is a method for constructing a functional asphalt pavement characterized by shaping and compacting the entire layer. Third, the present invention divides the asphalt mixture into at least two parts after the completion of the production of the asphalt mixture and before the compaction is completed, laying one of the asphalt mixture and leveling the other with the functional aggregate and optionally the binder. This is a method for constructing a functional asphalt pavement characterized by adding and mixing to form a functional asphalt mixture, spreading the same, forming a pavement layer, and compacting the entire layer. Fourth, the present invention relates to a first spreading device for spreading an asphalt mixture, and a mixing device for producing a functional asphalt mixture by adding a functional aggregate and optionally a binder to the asphalt mixture and mixing them. And a second spreading device for mainly spreading and spreading the functional asphalt mixture. Fifthly, the present invention provides a mixing apparatus for producing a functional asphalt mixture by adding and mixing a functional aggregate and a binder to an asphalt mixture, a first spreading apparatus for spreading the asphalt mixture, A second leveling device for spreading the functional asphalt mixture following, a first conveying device for transporting the asphalt mixture from the storage device for the asphalt mixture to the first leveling device, and a first leveling device for the asphalt mixture. And a second transport device for transporting the asphalt mixture from the storage device to the mixing device.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As a specific embodiment of the asphalt mixture of the present invention, the asphalt mixture immediately after production, the stored asphalt mixture, or the asphalt mixture spread using the asphalt mixture brought into the site, There are a method of adding and mixing a functional aggregate and a binder as required, and a method of dividing the asphalt mixture carried in into two parts, adding the functional aggregate and a binder as needed to one part, and mixing.

[0010] As a specific embodiment of the method for constructing a functional asphalt pavement of the present invention, a carried-in asphalt mixture is spread, and a functional aggregate and a binder are added to the surface layer of the asphalt mixture. After mixing as a functional asphalt mixture, shaping it, compacting the entire layer, and dividing the asphalt mixture carried in for 2 minutes,
There is a method in which a part thereof is paved, and a functional asphalt mixture is produced by adding and mixing a functional aggregate and a binder as needed to the remainder to produce a functional asphalt mixture, paving the mixture, and compacting the entire layer.

One typical application of the invention is to allow the incoming asphalt mixture to be bisected, partly constituting the lower part of the pavement and partly to the functional aggregate, if desired. It is adjusted to a functional asphalt mixture by adding and mixing a binder, and constitutes the upper part of the pavement,
As a result, not only the functional aggregate is selectively scattered on the upper part of the pavement, but also the functional asphalt pavement in which the thickness of the upper part where the functional aggregate is scattered is significantly reduced is constructed, While preventing the aggregate from falling off and peeling from the asphalt pavement and maintaining its functionality for a long time,
It shows a useful effect that desired functionality is imparted to the pavement at low cost. In particular, a functional asphalt pavement obtained by using a drainage asphalt pavement as an asphalt mixture and a rubber aggregate as a functional aggregate exhibits excellent low noise performance and has a long low noise and drainage performance. It can be continued, and it is possible to greatly reduce not only the construction cost but also the maintenance cost such as the restoration of the function of the drainage pavement.

[0012] The asphalt mixture of the present invention becomes a construction material of asphalt pavement as it is, and has a new functionality which is not present in the original mixture by adding and mixing a binder with a functional aggregate as desired. It is a functional asphalt mixture, and the functional asphalt mixture alone is an asphalt mixture that becomes a construction material of an asphalt pavement, and the asphalt amount is 3 to
Those in the range of 10% are preferred.

[0013] The term "after completion of the production of the asphalt mixture" refers to the time after the completion of the procedure for producing the asphalt mixture usable for pavement and before the asphalt mixture is cured. The asphalt mixture is usually manufactured by a procedure of dry-mixing the heated aggregate and the filler and spraying asphalt onto this, and then wet-mixing.In the present invention, after the completion of the wet mixing, the compaction is completed. For asphalt mixtures up to the point in time.

[0014] The functional aggregate is an aggregate for exhibiting functional performance not originally possessed by asphalt pavement, and is made of rubber, glass, metal, wood, fiber, ceramic, plastic, shell, paper, porous material. , Rocks and the like can be obtained by pulverization, particle size adjustment and the like. These functional aggregates have new functions such as slip resistance, low noise, visibility, reduction of road surface temperature, suppression of road surface freezing, deodorization, exhaust gas purification, and long-term maintenance performance of each of these functions. To the asphalt pavement. In particular, rubber is a preferred functional aggregate.

A functional asphalt pavement can be manufactured by adding and mixing the functional aggregate as exemplified above to the asphalt mixture. However, considering the adhesion between the functional aggregate and the asphalt mixture, Can add a binder and other additives. As the binder, asphalt, asphalt emulsion, cement, lime, a thermosetting resin such as acryl, epoxy, urethane and the like, and a thermoplastic resin such as SBR, SBS, SIS and EEA can also be used. In addition, a mineralizer, a vegetable oil, a softener for waxes, which softens the binder of the asphalt mixture, and a curing regulator for controlling the curing time of the functional asphalt mixture can also be added.

The case where rubber aggregate is used as the functional aggregate will be described as an example. Asphalt pavement mixed with rubber aggregate reduces the impact between tires and the road surface, reduces running noise, and reduces road noise. It has the property that the rubber aggregate is deformed by the tire load at the time of freezing and the frozen part is destroyed to suppress freezing. When rubber aggregate is added to the drainable asphalt pavement, in addition to the above, a new effect of suppressing clogging and maintaining drainage and the above-described functionality over a long period of time is obtained. When producing this functional drainage asphalt mixture, when using a heated asphalt mixture, use a resin binder such as epoxy, acrylic, or urethane, and when using a room temperature asphalt mixture, use an asphalt emulsion, a rubber-containing asphalt emulsion, or the like. It is preferable to use a separate binder. Further, for adjusting the decomposition of the emulsion, p
It is preferable to add an H regulator.

When a functional asphalt mixture is produced by adding and mixing a functional aggregate and a binder, if desired, to the asphalt mixture, the mixer used for producing the asphalt mixture may be used, or a separate mixer may be used. Is also good. In an asphalt plant equipped with silos, the produced asphalt mixture is stored in a silo, the asphalt mixture stored at the time of shipping the functional asphalt mixture is again charged into the mixer, and the functional aggregate is also charged and mixed. It is possible to produce an asphalt mixture which is particularly suitable for specially formulated asphalt mixtures and for mixtures which are efficient to produce all at once.

After transporting the asphalt mixture to the site,
Functional asphalt mixtures can also be produced. In this case, there is a method of spreading and mixing the asphalt mixture and then spraying and mixing the functional aggregate on the surface, and a method of producing the functional asphalt mixture and spreading it.
It can be selected as appropriate. Performing in-situ production of a functional asphalt mixture has the advantage that an asphalt plant only needs to produce one type of asphalt mixture.

When the functional asphalt mixture of the present invention is produced on-site, an asphalt viscosity reducing agent such as a cutback material, wax, paraffin, or microbubble generating component can be used in combination. When these reducing agents are used in combination,
The mixture is easy to handle and can be manufactured at an intermediate temperature, and can be easily spread and compacted.

The asphalt mixture carried in is spread and leveled,
Next, a functional asphalt pavement can be constructed by spraying a functional aggregate thereon, mixing the asphalt mixture and the functional aggregate to produce a functional asphalt mixture, and reshaping the mixture. it can. Spraying of functional aggregates,
Mixing can be performed over the entire width of the pavement or partially. In addition, the functional aggregate can be scattered only on the upper part of the pavement, or can be scattered over the whole layer of the pavement. A pavement in which functional aggregate is scattered on the upper part of the pavement with the rutted portion as a main area is suitable as a functional asphalt pavement for the purpose of low noise and suppression of freezing, and the same aggregate is used as the pavement. Are suitable as a pavement having flow resistance.

Further, the asphalt mixture carried in is divided into two parts, one part is spread as a lower layer, and one part is adjusted to a functional asphalt mixture via a mixing device. An asphalt pavement may be constructed, or a functional asphalt pavement with a layer configuration reversed. The asphalt mixture carried in may be spread over unevenness, and the functional asphalt mixture may be embedded in the recesses, or the functional asphalt mixture may be used for a part of the pavement width, and the functionality manufactured from the rest of the asphalt mixture carried in If the asphalt mixture is used for the rest of the pavement width, stripes of the asphalt mixture and the functional asphalt mixture can also be constructed.

In constructing a functional asphalt pavement at the current position, the first step is to spread the asphalt mixture.
It is preferable to use a spreading device, a second spreading device for mainly spreading the functional asphalt mixture, and a mixing device for producing a functional asphalt mixture from the asphalt mixture and the functional aggregate. It is preferable to use a spreading device integrated with the mixture storage device and the traveling device. In addition, this spreading device
A storage device for functional aggregates, a storage device for binders and the like, and a spraying device can also be attached.

An apparatus suitable for constructing a functional asphalt pavement by producing a functional asphalt mixture after the entire amount of the asphalt mixture is spread is a first leveling apparatus for spreading the asphalt mixture, A second spreading device for mainly spreading the asphalt mixture, and a mixing device for producing a functional asphalt mixture from the asphalt mixture and the functional aggregate,
It is preferable that the spreading device, the functional aggregate dispersing means, the mixing device, and the second spreading device are arranged in this order. The first spreading device may include a screw spreader for spreading the asphalt mixture, and a strike-off device. The dispersing means may use a known dispersing device other than human power, and the mixing device may be a rotor type or a pickup. A pug mill type having means can be used, and a screw spreader, a tamper, and a vibration compaction device can be appropriately combined with the second screed.

An apparatus suitable for splitting the asphalt mixture into two parts and leveling one part to produce a functional asphalt mixture from one part and leveling the mixture to construct a functional asphalt pavement is A first spreading device for spreading an asphalt mixture, followed by a second spreading device for spreading a functional asphalt mixture, and a mixing device for producing a functional asphalt mixture from the asphalt mixture and the functional aggregate. A first transport device for transporting the asphalt mixture from the storage device for asphalt mixture to the first or second spreading device, and a second transport device for transporting the asphalt mixture from the storage device for asphalt mixture to the mixing device. A plurality of aggregate storage devices, a plurality of binder storage devices, an elastic mixture mixing device, a mixer and a second spread leveling device as appropriate. It is provided with a conveying device or the like to.

By the way, it is usually difficult to spread the asphalt mixture at a thickness of less than 2.5 times the maximum aggregate particle size. However, it is known that the two layers are almost simultaneously used so that the thickness of the upper layer is substantially equal to the maximum particle size of the aggregate. For example, a remixer of a road surface stabilization method is used. Can be given as However, since the remixer has only one storage device, and the first spreading device has no means for transporting the asphalt mixture in the storage device, it is not suitable for carrying out the present invention. It also has two storage devices, from the first storage device to the first spreading device, from the second storage device to the second storage device.
A spreader for conveying the mixture to a spreader for the spreader is also disclosed, but it is not equipped with a mixing device for stirring and mixing the functional aggregate and the asphalt mixture, which is still unsuitable for carrying out the present invention. is there.

[0026]

FIG. 1 shows a first embodiment of the present invention. The asphalt mixture brought into the pavement site is transferred from the storage device to the first asphalt mixture through a transport device (both not shown).
The asphalt mixture 1 is conveyed to the front of the screed 2 and spread by the screw spreader 3 and spread by the first screed. Functional aggregate 4 on spread surface
Is supplied by a supply means (not shown), and the upper part of the asphalt mixture and the aggregate that are spread are stirred and mixed by a mixing device 5 (hoods are not shown). The new asphalt mixture produced by this mixing is shaped by the second screed 6 and compacted by the compacting machine 7 to construct the functional asphalt pavement 8. First
It is preferable that the screed 2, the mixing device 5, and the second screed 6 are integrated into a vehicle having a traveling device. However, the mixing device 5 and the second screed 6 can be separated from the first screed 2.

The aggregate 4 may be sequentially charged into the mixing device. Although the mixing device 5 is shown as a rotor type in the drawing, it may be a bag mill type or may have a pickup device. In addition, a binder spraying device may be appropriately provided in front of the mixing device or in the hood. First screed 2, second
The screed 6 is preferably provided with a compaction device such as a tamper, a vibrating body or the like, and preferably has a mechanism for adjusting the working width. In the mixing device, the width adjusting mechanism may be configured such that the two rotors are arranged back and forth so as to slide each other. For the screed, a known expanding and contracting means may be used.

In order to make the surface to be striped with the asphalt mixture and the functional asphalt mixture, a mixing device 5 having a width smaller than that of the first screed 2 and a single or a plurality of second screeds 6 having substantially the same width as the mixing device 5 are used. , It may be mixed and shaped only once or multiple times,
By mixing and shaping each aggregate using several kinds of color aggregates, it is possible to construct a striped visibility asphalt pavement by shaping, and it is possible to construct not only a straight line but also the adjustment mechanism of the working width described above. It is also possible to draw a curved pattern.

FIG. 2 shows a second embodiment of the present invention, in which a self-propelled vehicle (not shown) is mounted on a base 10 and a hopper 11 for asphalt mixture and having an opening at a lower portion, a rubber chip and the like. Hopper 12, first screed 13, second screed 14, mixer 15, feeder (lower belt conveyor) 16 for first screed, feeder (upper belt conveyor) 17 for mixer, of functional aggregate (hereinafter referred to as rubber chip) Is installed. In this example, the functional aggregate such as a rubber chip is configured to be charged into the mixer 15 as a resin mixture.
Resin curing agent tank 17, mixer 1 for mixing resin liquid
8. Resin liquid supply pump 19 and rubber chip supply device 2
0, a mixer 20 for producing a rubber chip mixture and a feeder 21 for feeding the rubber chip mixture into the mixer 15. The mixer 15 is installed to discharge to the second screed 14, and is not particularly equipped with a conveying device for the asphalt mixture containing rubber chips.

From the dump truck (not shown) to the hopper 1
The asphalt mixture transferred to 1 is separated into two systems by a feeder 16 and a feeder 17. Feeder 16
The asphalt mixture conveyed by means of is spread from the screw spreader 22 to the first screed 13 or spread to form the lower layer 23. The asphalt mixture conveyed by the feeder 17 is charged into the mixer 15, mixed with the rubber chip mixture charged at the same time to be stirred and mixed into an asphalt mixture containing rubber chips, discharged to the front of the screw spreader 24, and discharged from the screw spreader 24 through the second screed. Then, the upper layer 25 is formed. When the upper layer 25 is spread, since the lower layer 23 is still in a soft state, even if the lower layer 23 is spread with a thin spread thickness of about the aggregate maximum particle size,
The second screed 14 does not cause abrasion of the aggregate, a thin layer of asphalt pavement containing a rubber chip is reliably obtained, and the thickness of the lower layer 23 is appropriately set at twice or more the maximum aggregate particle size. As a result, a functional asphalt pavement having a desired layer thickness and having rubber chips scattered in a thin portion at the top can be obtained.

The positional relationship between the first leveling device 13 and the second leveling device 14 in the traveling direction, the positional relationship and width in the width direction,
The leveling height is not limited to the above example, but can be changed as appropriate. For example, the first screed 13 may be divided into two parts and separated by the width of the second screed 14, and all the screeds may be set to the same spread thickness. The pavement of the present invention obtained by this configuration has a shape in which the functional asphalt mixture is sandwiched between the asphalt mixture. The two divided first screeds 13 are connected to each other with separate screeds having a lower flattening height to form a concave asphalt mixture layer as a new first screed 13, and the second screed 14 is formed on the concave surface. Can also embed a functional asphalt mixture. The number of divisions of the first screed 13 and the number of divisions of the second screed 14 can be appropriately determined, and the connection of the first screeds 13 can also be appropriately determined. However, it is necessary to take measures for preventing the asphalt mixture and the functional asphalt mixture from intermingling with each other in front of the second screed 14, such as providing a partition plate. When the second screed 14 is divided, the mixer 15
It is necessary to consider the means of discharge from

[0032]

According to the method for producing a functional asphalt mixture of the present invention, a desired functional asphalt mixture can be easily prepared not only in an asphalt plant but also on site. According to the method for constructing a functional asphalt pavement of the present invention, a desired functionality can be imparted to a desired portion in a desired amount, and the production quantity of an expensive functional asphalt mixture can be minimized. Further, the labor for manufacturing the asphalt mixture of the pavement body in the asphalt plant is greatly reduced. When a rubber aggregate is used as the functional aggregate in the present invention, a low-noise pavement whose functionality is maintained for a long period of time can be constructed at low cost while having excellent low-noise and drainage properties. Become.
By using the functional asphalt pavement construction device of the present invention, it is possible to simplify the method of constructing a functional asphalt pavement, while ensuring the stability of the functional asphalt pavement, Desired functionality can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the method of the present invention.

FIG. 2 is an explanatory view showing another example of the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Asphalt mixture 2 1st screed 3 Screw spreader 4 Functional aggregate 5 Mixing device 6 2nd screed 7 Rolling machine 13 1st screed 14 2nd screed 15 Mixer 16 and 17 Feeder 22 and 24 Screw spreader

Claims (5)

[Claims] 1. A functional asphalt mixture comprising the steps of: adding a functional aggregate and, if desired, a binder to a part of the asphalt mixture and completing mixing before the compaction is completed after the production of the asphalt mixture is completed. Production method. 2. After the asphalt mixture is spread, a functional aggregate and a binder are added to the surface layer of the asphalt mixture, and at least the asphalt mixture of the surface layer, the functional material, and a binder present as desired are mixed. A method for constructing a functional asphalt pavement characterized by shaping this and compacting the entire layer. 3. After the production of the asphalt mixture and before the compaction is completed, the asphalt mixture is divided into at least two parts, one of which is leveled, and the other is added with a functional aggregate and optionally a binder. A method for constructing a functional asphalt pavement, comprising mixing and forming a functional asphalt mixture, spreading the same, forming a pavement layer, and compacting the entire layer. 4. A first spreading device for spreading an asphalt mixture, a mixing device for adding a functional aggregate and optionally a binder to the asphalt mixture and mixing them to produce a functional asphalt mixture; A second spreading device for mainly spreading the asphalt mixture, and a functional asphalt pavement construction device. 5. A mixing device for producing a functional asphalt mixture by adding and mixing a functional aggregate and a binder as required to the asphalt mixture, a first spreading device for spreading the asphalt mixture, and a A second spreading device for spreading the following functional asphalt mixture, a first conveying device for transporting the asphalt mixture from the storage device for the asphalt mixture to the first or second spreading device, and an asphalt mixture. A device for constructing a functional asphalt pavement, comprising a second transport device for transporting an asphalt mixture from a storage device for use to a mixing device.