JP2007002502A - Structure of elastic pavement body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of an elastic pavement body which can maintain resistance to a slip in wet conditions even after a lapse of a long in-service period, and can impart durability against the cracking of the uppermost layer of the elastic pavement body. <P>SOLUTION: In this structure of the elastic pavement body, a layered body is constituted by superposing two elastic pavement layers 6a and 6b in which elastic aggregate 3 and rigid aggregate 4 are consolidated by a resin binder 5 on foundation ground 1 via an adhesion layer 2. The elastic pavement layer 6a which constitutes the uppermost layer of the elastic pavement body is constituted by consolidating such flat chip-like or fiber-like elastic aggregate 3 as to be chipped off from a waste tire etc. , and the fine rigid aggregate 4 composed of crushed stone, silica sand, etc. by using a resin binder 5. Additionally, the elastic pavement layer 6b which constitutes a lower layer of the elastic pavement body is constituted by consolidating the elastic aggregate 3 of a granular material which is obtained by crushing a vulcanized rubber chip, particularly, a used rubber article such as the waste tire, and the fine rigid aggregate 4 which is composed of the crushed stone, the silica sand, etc. , by using the resin binder 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of an elastic pavement, more specifically, a structure of an elastic pavement that can maintain slip resistance when wet and can provide durability against cracking of the uppermost layer of the elastic pavement. It is about.

  Conventionally, the structure of an elastic pavement is laminated by laminating two or more elastic pavement layers in which elastic aggregates such as vulcanized rubber chips and fine hard aggregates such as crushed stone and silica sand are consolidated with a resin binder. What constituted the body is known (for example, refer to patent documents 1).

  Such an elastic pavement has a structure with rubber elasticity and voids, and has a noise reduction effect due to a reduction in noise generated during running and a sound absorption effect, and also increases the sliding friction coefficient of the road surface due to rain or the like. Excellent wet slip resistance with water film remaining on top.

However, in the case of an elastic pavement layer in which elastic aggregates and hard aggregates are simply consolidated with a resin binder, it is possible to maintain slip resistance when wet after long-term use, but against repeated load applied from the road surface. Therefore, there is a problem that the uppermost elastic pavement layer is easily cracked and difficult to impart durability.
JP 2002-21008 A

  The present invention pays attention to such conventional problems, and can maintain slip resistance when wet even after long-term use, and can provide durability against cracking of the uppermost layer of the elastic pavement. It is intended to provide a body structure.

  In order to achieve the above-mentioned object, the present invention provides an elastic pavement layer that constitutes the uppermost layer of an elastic pavement, in which flat chip-like or fiber-like elastic aggregates and hard aggregates are consolidated by a resin binder. The gist of the configuration is as follows.

  Here, the volume ratio of the elastic aggregate to the hard aggregate in the uppermost layer is 5/95 to 70/30, and the flat chip-shaped elastic aggregate has an average diameter of 0.5 to 10 mm. And the fiber-like elastic aggregate has an average length of 0.5 to 50 mm and an aspect ratio of 5 to 100, and the laminate has a compressive elastic modulus of 1 10 MPa.

  By comprising in this way, while being able to maintain the slip resistance at the time of wetness, durability with respect to the crack of the uppermost layer of an elastic pavement can be provided.

  In the present invention, as described above, the elastic pavement layer constituting the uppermost layer of the elastic pavement is configured by consolidating a flat chip-like or fiber-like elastic aggregate and a hard aggregate with a resin binder. Therefore, even after long-term use, there is an effect that it is possible to maintain the slip resistance when wet and to impart durability against cracking of the uppermost layer of the elastic pavement.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a partially enlarged cross-sectional perspective view of an elastic pavement embodying the present invention. The structure of the elastic pavement is composed of an elastic aggregate 3 and a hard aggregate 4 via an adhesive layer 2 on a foundation ground 1. Two layers of elastic pavement layers 6a and 6b consolidated with resin binder 5 (in this embodiment, a two-layer structure is used, but the number of stacked layers is not particularly limited, and two or more layers are also possible. There is a laminated structure.

  In the embodiment of the present invention, a flat chip-like or fiber-like elastic aggregate 3 in which the elastic pavement layer 6a constituting the uppermost layer of the elastic pavement is scraped off from a waste tire or the like, and crushed stone or quartz sand. A fine hard aggregate 4 made of, for example, is solidified by a resin binder 5 and an elastic pavement layer 6b constituting a lower layer of the elastic pavement is used for a vulcanized rubber chip, particularly a waste tire. A granular elastic aggregate 3 obtained by pulverizing a finished rubber article and a fine hard aggregate 4 made of crushed stone or silica sand are consolidated by a resin binder 5.

  As the hard aggregate 4, natural stone, artificial stone or the like is used, and in particular, a granular material made of a crushed stone, silica sand, a silicon compound such as silicon nitride or silicon carbide is preferably used, and the resin binder 5 is an epoxy resin, Thermosetting resins such as urethane resins and polyester resins are preferably used.

  Moreover, it is preferable that the volume ratio of the elastic aggregate 3 and the hard aggregate 4 which occupies in the elastic pavement layer 6a which comprises the uppermost layer is 5 / 95-70 / 30. Thereby, both the compression elastic modulus of the elastic pavement layer 6a and the slip resistance when wet can be adjusted, and the noise reduction effect and the slip resistance can be maintained in a well-balanced manner. In this case, the volume ratio of the elastic aggregate 3 can be less than 5% with respect to the volume ratio of the hard aggregate 4.

  The flat chip-shaped elastic aggregate has an average diameter of 0.5 to 10 mm and an aspect ratio of 3 to 40, and the fiber-shaped elastic aggregate has an average length of 0.5 to 50 mm, and The aspect ratio is preferably 5 to 100. Here, the aspect ratio refers to the ratio of the length of the elastic aggregate 3 in the longest direction to the shortest direction.

  In this invention, it is good to adjust the average particle diameter of the hard aggregate 4 in the elastic pavement layer 6a which comprises the uppermost layer to 0.1-13 mm, respectively. Thereby, while ensuring the noise reduction effect, it is possible to prevent the hard aggregate 4 from peeling off from the paved road surface over a long period of time and to maintain the slip resistance performance more reliably.

  When the average particle size of the hard aggregate 4 is 0.1 mm or more, the void ratio is suitable, and the drainage property and noise reduction effect are ensured, and the peeling from the uppermost elastic pavement layer 6a is prevented, and the workability is less than 13 mm. The area occupied by the elastic aggregate 3 on the surface becomes favorable, and the slip resistance when wet is maintained, and the surface roughness becomes suitable, and the noise reduction effect is secured. Moreover, when the average particle diameter of the elastic aggregate 3 of the elastic pavement layer 6b constituting the lower layer is 0.1 mm or more, the porosity is suitable, and the drainage property and noise reduction effect are secured, and when it is 13 mm or less, the workability is good.

  Moreover, it is good to adjust the compression elastic modulus of the elastic pavement layers 6a and 6b constituting the laminate to 1 to 10 MPa. When the compressive elastic modulus is 1 MPa or more, vehicle running performance is good, and when it is 10 MPa or less, a noise reduction effect is secured. Furthermore, the compression elastic modulus of the elastic pavement layer 6a constituting the uppermost layer is set to 5 to 20 MPa, and the compression elastic modulus of the elastic pavement layer 6b constituting the laminate excluding the uppermost layer is preferably set to 0.5 to 5 MPa. . By setting in this way, the durability in the uppermost layer is enhanced, and the noise reduction effect in the lower layer is maintained, so that the noise reduction effect as an elastic pavement can be more reliably maintained.

  The adjustment of the above-described compression elastic modulus can be performed by selecting the type, size, and mixing ratio of the elastic aggregate 3 and the hard aggregate 4, and the type and mixing ratio of the resin binder 5 that couples them. This is done by adjusting the filling amount. In addition, the value measured based on JISK6254 is applied as a compression elastic modulus in this invention.

  As described above, in the elastic pavement of the present invention, the elastic pavement layer 6a constituting the uppermost layer of the elastic pavement is replaced with a flat chip-like or fiber-like elastic aggregate 3 and a hard aggregate 4 as a resin binder. Since it is solidified by -5, it is possible to maintain slip resistance when wet even after long-term use, and to provide durability against cracking of the uppermost layer of the elastic pavement. Can effectively prevent cracking.

  The hard aggregates, elastic aggregates, and binders in the upper and lower elastic pavement layers 6a, 6b are varied in volume ratio as shown in Table 1, and test specimens of 500 mm squares in length and width (Examples 1 to 6, Comparative Example 1, 3) each of 2) were prepared, and the durability evaluation results are also shown in Table 1.

  The fiber-like elastic aggregate 3 has an aspect ratio of 14 when the average length is 20 mm, and an aspect ratio of 25 when the average length is 40 mm.

[Compressive modulus]
A circular test piece (99 mm in diameter) was cut out from each test piece in Table 1, and the entire compression modulus (laminate) of each test piece was measured according to JIS K 6254. The results are also shown in Table 1. did. The compression modulus was calculated by the following equation from the relationship between the compression force and the strain amount at the second time after repeatedly compressing twice over 6 mm from the upper surface at a compression speed of 10 mm / min.
Compression modulus = (compressive force when strain is 5 mm-compressive force when strain is 2 mm) / (test piece cross-sectional area = 7694 mm ² ) x (thickness of test piece) / (thickness deformation of test piece = (3mm)

[Durability Evaluation Method]
A road with a wheel load of 2.1 t, a running speed of 12 km / h, and a circumference of 3 m in diameter are circulated by a truck / bus tire (tread width 225 mm) on the road surface on which the test body is installed. Observe the state of the specimen after running 100,000 wheels (50,000 revolutions).

  From Table 1, it turned out that the test body of Examples 1-6 can prevent the crack of the upper elastic pavement layer 6a compared with the test body of Comparative Examples 1-2.

It is a partially expanded sectional perspective view of the elastic pavement which implemented this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foundation ground 2 Adhesive layer 3 Elastic aggregate 4 Hard aggregate 5 Resin binder
6a, 6b Elastic pavement layer

Claims (5)

In the structure of an elastic pavement formed by laminating two or more elastic pavement layers obtained by consolidating elastic aggregates and hard aggregates with a resin binder,
An elastic pavement comprising an elastic pavement layer constituting the uppermost layer of the elastic pavement, wherein a flat chip-like or fiber-like elastic aggregate and a hard aggregate are consolidated by a resin binder. Body structure. The structure of the elastic pavement according to claim 1, wherein the volume ratio of the elastic aggregate to the hard aggregate in the uppermost layer is 5/95 to 70/30. The structure of the elastic pavement according to claim 1 or 2, wherein the flat chip-like elastic aggregate has an average diameter of 0.5 to 10 mm and an aspect ratio of 3 to 40. The structure of the elastic pavement according to claim 1 or 2, wherein the fiber-like elastic aggregate has an average length of 0.5 to 50 mm and an aspect ratio of 5 to 100. The structure of the elastic pavement according to claim 1, 2, 3 or 4, wherein the compression elastic modulus of the laminate is 1 to 10 MPa.

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