JP4316512B2 - Porous elastic paving material - Google Patents

Description

  The present invention relates to a porous elastic pavement material, and more particularly to a porous elastic pavement material that maintains slip resistance when wet for a long period of time without reducing the noise reduction effect.

  Conventionally, a porous elastic pavement material in which an elastic material such as a vulcanized rubber chip is used as an aggregate and bonded with a binder such as a resin has been widely used mainly in the civil engineering field. However, such a porous elastic pavement has a problem that the sliding friction coefficient of the road surface is extremely reduced when the water film remains on the pavement due to rain or the like, and therefore, it becomes easy to slip.

As a countermeasure, in addition to elastic aggregates such as vulcanized rubber chips, fine hard aggregates such as crushed stone and silica sand are mixed to increase the sliding friction coefficient of the road surface and improve wet-kid characteristics. (See, for example, Patent Documents 1 and 2). However, in these proposals, since the particle diameter of the hard aggregate to be mixed as the third component is made fine from the viewpoint of not impairing the sound absorption performance, the hard aggregate 3 is elastic as illustrated in FIG. It is easy to take the form adhering to the surface of the aggregate 2, whereby the fine hard aggregate 3 directly adhering to the surface of the elastic aggregate 2 is gradually peeled off as the service period elapses, and finally the sliding friction coefficient of the road surface There was a problem of lowering.
JP 2002-21008 A JP 2000-319808 A

  An object of the present invention is to provide a porous elastic pavement material which can eliminate such conventional problems and maintain slip resistance when wet for a long time without lowering the noise reduction effect. .

In order to achieve the above object, the porous elastic pavement material of the present invention is a porous material formed by laminating a plurality of elastic pavement layers in which elastic aggregates and hard aggregates are consolidated with a resin binder. In the elastic pavement, the average particle diameter of the elastic aggregate and the hard aggregate in the elastic pavement layer constituting the uppermost layer is 0.1 to 13 mm, respectively, and the ratio of the average particle diameter of the elastic aggregate and the hard aggregate is 15 / 1/15, the volume ratio of the elastic aggregate and the hard aggregate is 5/95 to 70/30, and the average particle diameter of the elastic aggregate in the elastic pavement layer constituting the laminate excluding the uppermost layer 0.3 to 13 mm, the volume ratio of the elastic aggregate and the hard aggregate is 100/0 to 30/70, and the compression elastic modulus of the elastic pavement layer in the uppermost layer is a laminate excluding the uppermost layer Greater than the compressive modulus of the elastic pavement layer The compression elastic modulus of the elastic pavement layer composing the uppermost layer is 5 to 20 MPa, the compression elastic modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer is 0.5 to 5 MPa, and the porous elastic pavement. The gist is that the compression elastic modulus of the laminate constituting the material is 1 to 10 MPa .

According to the present invention, since the ratio of the average particle diameter of the elastic aggregate and the hard aggregate in the uppermost layer is set to 15/1 to 1/15, the elastic aggregate and the hard aggregate are substantially separated by the resin binder. Because it is surrounded evenly and elastic aggregate and hard aggregate are arranged in parallel on the surface, the arch effect prevents the hard aggregate from peeling off the paved road surface for a long time and maintains the slip resistance performance. . Moreover, the average particle diameter of the elastic aggregate and the hard aggregate in the elastic pavement layer constituting the uppermost layer is 0.1 to 13 mm, respectively, and the ratio of the average particle diameter of the elastic aggregate and the hard aggregate is 15/1 to 1 / 15, the volume ratio of the elastic aggregate to the hard aggregate is 5/95 to 70/30, and the average particle diameter of the elastic aggregate in the elastic pavement layer constituting the laminate excluding the uppermost layer is 0.3. -13 mm, the volume ratio of the elastic aggregate and hard aggregate is 100/0 to 30/70, and the compression modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer is the uppermost layer After making it smaller than the compressive elastic modulus of the elastic pavement layer, the elastic modulus of the elastic pavement layer constituting the uppermost layer is 5 to 20 MPa, and the elastic modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer is 0. 5 to 5 MPa, of the laminate constituting the porous elastic pavement material (whole) Having a reduced elastic modulus in 1 to 10 MPa, does not lower the noise reduction effect is ensured flexibility as stack.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the features of the present invention will be described for each component requirement while dividing the component requirements of the present invention.

  FIG. 1 is a cross-sectional view showing a state in which an example of a porous elastic pavement material according to an embodiment of the present invention is installed on a roadbed.

  In FIG. 1, a porous elastic pavement 1 includes a plurality of elastic pavement layers (two layers of a top layer 1a and a lower layer 1b in the figure) in which an elastic aggregate 2 and a hard aggregate 3 are consolidated by a resin binder-4. It consists of a laminated body and is installed on the roadbed G. And the ratio of the average particle diameter of the elastic aggregate 2 and the hard aggregate 3 in the elastic pavement layer which comprises the uppermost layer 1a is adjusted so that it may be set to 15/1-1/15. Furthermore, the compression elastic modulus of the elastic pavement layer constituting the uppermost layer 1a is larger than the compression elastic modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer.

  Thus, by adjusting the ratio of the average particle diameters of the elastic aggregate 2 and the hard aggregate 3 in the uppermost layer 1a, the elastic aggregate 2 and the hard aggregate 3 are substantially uniformly surrounded by the resin binder-4. Since the elastic aggregate and the hard aggregate are arranged substantially in parallel on the surface, the arch effect can prevent the hard aggregate 3 from peeling off from the paved road surface over a long period of time and maintain the slip resistance performance. it can. Moreover, since the compression elastic modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer 1a is smaller than the compression elastic modulus of the elastic pavement layer constituting the uppermost layer 1a, the flexibility as the laminate is ensured, The noise reduction effect generated when the vehicle is running is not reduced.

  The above-described adjustment of the compression elastic modulus is performed by selecting the type, size, and mixing ratio of the elastic aggregate 2 and the hard aggregate 3, and further selecting the type and mixing ratio of the resin binder-4 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.

  In the present invention, a vulcanized rubber chip is preferably used as the elastic aggregate 2, and in particular, a granular or crumpled body obtained by pulverizing a used rubber article typified by a waste tire is most preferably used. Further, as the hard aggregate 3, natural stone, artificial stone or the like is used, and in particular, a granular body made of a crushed stone, silica sand, silicon compound such as silicon nitride or silicon carbide is preferably used. Furthermore, as the resin binder 4, a thermosetting resin such as an epoxy resin, a urethane resin, or a polyester resin is preferably used.

Furthermore, in this invention , the average particle diameter of the elastic aggregate 2 and the hard aggregate 3 in the uppermost layer 1a is adjusted to 0.1 to 13 mm, respectively . Thereby, while ensuring the noise reduction effect, it is possible to prevent the hard aggregate 3 from peeling off from the paved road surface over a long period of time and to more reliably maintain the anti-slip performance.

  If the average particle diameter of the hard aggregate 3 is less than 0.1 mm, the porosity becomes too small and the drainage and noise reduction effects are insufficient, and it is easy to peel off from the uppermost layer 1a. The surface roughness becomes too large, and the noise reduction effect is reduced.

  If the average particle diameter of the elastic aggregate 2 is less than 0.1 mm, the porosity is too small and the drainage and noise reduction effects are insufficient, and if it exceeds 13 mm, the area occupied by the elastic aggregate 2 on the surface increases locally. In addition to insufficient slip resistance when wet, in addition to deterioration of workability, the noise reduction effect decreases due to the increase in surface roughness.

Furthermore, in this invention , the volume ratio of the elastic aggregate 2 and the hard aggregate 3 which occupies in the uppermost layer 1a is adjusted to be 5/95 to 70/30 . Thereby, both the compression elastic modulus of the uppermost layer 1a 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 2 can be less than 5% with respect to the volume ratio of the hard aggregate 3.

Furthermore, in this invention, the compression elastic modulus of the laminated body (whole) which comprises the porous elastic pavement material 1 is adjusted to 1-10 MPa . When the compressive elastic modulus is less than 1 MPa, the vehicle running performance is deteriorated, and when it exceeds 10 MPa, the noise reduction effect is lowered. In addition , the compression elastic modulus of the elastic pavement layer constituting the uppermost layer 1a is set to 5 to 20 MPa, and the compression elastic modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer 1a is set to 0.5 to 5 MPa. is doing. Thereby , while improving the durability in the uppermost layer 1a and maintaining the noise reduction effect in the lower layer, the noise reduction effect as the porous elastic pavement material 1 can be more reliably maintained.

Furthermore, in this invention , it adjusts so that the volume ratio of the elastic aggregate 2 and the hard aggregate 3 which occupies for the elastic pavement layer which comprises the laminated body except the uppermost layer 1a may be set to 100 / 0-30 / 70 . . Thereby, the target compression elastic modulus can be ensured and the noise reduction effect can be exhibited reliably.

Further, in this invention, the elastic aggregates 2 in the elastic pavement layer constituting the laminate excluding the top layer 1a, and vulcanized rubber composed of ground granules, the average particle size of the granulate 0.3 It is adjusted to ~ 13mm . If the average particle diameter of the elastic aggregate 2 is less than 0.3 mm, the porosity becomes too small and the drainage and noise reduction effects are insufficient, and if it exceeds 13 mm, the individual porosity becomes too large and the sound absorption effect becomes worse, resulting in noise. It is disadvantageous for reduction and workability at the time of construction decreases.

  Instead of the above, the elastic aggregate 2 in the elastic pavement layer constituting the laminate excluding the uppermost layer 1a is constituted by a hijiki-like body obtained by pulverizing vulcanized rubber or the like, and the average diameter of this hijiki-like body is 0.5. -10 mm, and the average aspect ratio can be set to 3-40.

  Usually, the total thickness of the porous elastic pavement material 1 is set to about 30 to 100 mm. Therefore, in the present invention, the thickness of the uppermost layer 1a may be set to 5 to 30 mm, and the thickness of the lower layer 1b may be set to be 5 mm or more larger than the thickness of the uppermost layer 1a. Thereby, maintenance of anti-slip performance over a long period of time and suppression of noise can be ensured at the same time. If the thickness of the uppermost layer 1a is less than 5 mm, the hard aggregate 3 is easily peeled off, and if it exceeds 30 mm, the lower layer 1b is compressed by the dead weight of the uppermost layer 1a, and the compression elastic modulus of the porous elastic pavement material 1 increases, resulting in noise. This is disadvantageous for the reduction effect and increases the cost. If the thickness of the lower layer 1b is not larger than the thickness of the uppermost layer 1a by 5 mm or more, similarly to the above, the compression elastic modulus of the porous elastic pavement material 1 is increased, which is disadvantageous for the noise reduction effect.

  In this invention, in order to strengthen the bond between the hard aggregate 3 and the resin binder-4, the hard aggregate 3 is preferably subjected to surface treatment in advance. Examples of the surface treatment method include dry and wet treatment with a coupling agent (such as silane and titanate).

  In the embodiment described above, the case where the porous elastic pavement material 1 of the present invention is composed of a two-layered laminate of the uppermost layer 1a and the lower layer 1b is exemplified, but the lower layer 1b is not limited to one layer, but 2 It can consist of more than one layer. In this case, you may make it mix the elastic aggregate 2 mentioned above and the fine hard aggregate 3 together with the resin binder-4 in the layer which comprises the lower layer 1b. The average particle diameter of the hard aggregate 3 in this case is not particularly limited, but is preferably smaller than the average particle diameter of the elastic aggregate 2 and 0.05 to 5 mm.

As described above, the porous elastic paving material of the present invention is composed of a laminate of two or more layers, and the average particle diameter of the elastic aggregate and the hard aggregate in the uppermost layer , the average particle of the elastic aggregate and the hard aggregate Specific ratio of diameter, volume ratio occupied by elastic aggregate and hard aggregate, respectively, and average particle diameter of elastic aggregate in elastic pavement layer constituting the laminate excluding the uppermost layer, elastic aggregate and hard aggregate Respectively, and the compression modulus in the uppermost layer is made larger than the compression modulus in the laminate excluding the uppermost layer, and then the compression modulus in the uppermost layer and the compression elasticity in the lower layer excluding the uppermost layer. By specifying the elastic modulus and the compression elastic modulus of the elastic pavement as a whole, the anti-slip performance is maintained over a long period of time, and the generation of noise is suppressed, and is particularly suitable as an elastic pavement for a vehicle traveling road surface. .

Aggregates and binders in the upper and lower layers are made different as shown in Table 1, and three specimens (Examples 1 to 3 and Comparative Examples 1 and 2) each having a 500 mm square are prepared. The wet slip resistance values were measured and listed in Table 1. The wet slip resistance value was measured with a dynamic friction tester after a water film having a thickness of about 1 mm was formed on the upper surface of each specimen by a joro.

  In addition, circular test pieces (diameter 99 mm) each having an upper layer, a lower layer, and an overall thickness of 30 mm in Table 1 were prepared, and the compressive modulus of each layer and the whole of each test piece was determined in accordance with JIS K 6254, respectively. The results were measured and the results are shown in Table 1. The compression modulus was calculated by the following equation from the relationship between the compression force and the amount of strain for 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 amount is 5 mm−compressive force when strain amount is 2 mm) / (test piece cross-sectional area = 7694 mm ² ) × (thickness of test piece = 30 mm) / (thickness deformation of test piece) (Amount = 3mm)

From Table 1, in the specimens of Examples 1 to 3 , compared with the specimens of Comparative Examples 1 and 2, there was almost no variation in wet slip resistance value at the time of a new article and after use, and excellent slip resistance over a long period of time. It can be seen that the sex is maintained.

It is sectional drawing which shows the state which installed the porous elastic pavement material by embodiment of this invention on the roadbed. It is a partial cross section figure which shows the arrangement structure of the elastic aggregate and hard aggregate in the conventional porous elastic pavement material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Porous elastic pavement material 1a Top layer 1b Lower layer 2 Elastic aggregate 3 Hard aggregate 4 Resin binder

Claims (4)

In a porous elastic pavement formed by laminating a plurality of elastic pavement layers obtained by consolidating elastic aggregates and hard aggregates with a resin binder,
The average particle diameter of the elastic aggregate and the hard aggregate in the elastic pavement layer constituting the uppermost layer is 0.1 to 13 mm, respectively, and the ratio of the average particle diameter of the elastic aggregate and the hard aggregate is 15/1 to 1/15 The volume ratio of the elastic aggregate to the hard aggregate is 5/95 to 70/30, and the average particle diameter of the elastic aggregate in the elastic pavement layer constituting the laminate excluding the uppermost layer is 0.3 to Elastic pavement forming 13 mm, volume ratio of elastic aggregate and hard aggregate being 100/0 to 30/70, and the elastic modulus of the elastic pavement layer in the uppermost layer constituting the laminate excluding the uppermost layer The elastic modulus of the elastic pavement layer constituting the uppermost layer is set to 5 to 20 MPa, and the elastic modulus of the elastic pavement layer constituting the laminate excluding the uppermost layer is set to 0.5 to 5 MPa, of the laminate constituting the porous elastic pavement A porous elastic paving material having a compression elastic modulus of 1 to 10 MPa . The porous elastic pavement according to claim 1, wherein the thickness of the uppermost layer is 5 to 30 mm, and the thickness of the laminate excluding the uppermost layer is 5 mm or more larger than the thickness of the uppermost layer. The laminate excluding the uppermost layer is composed of two or more layers, and the elastic aggregate and average particle diameter of the elastic pavement layer constituting the laminate are smaller than the elastic aggregate and 0.05 to 5 mm. The porous elastic pavement according to claim 1 or 2, wherein a hard aggregate is mixed.
The elastic aggregates in the elastic pavement layer constituting the laminate, except for the top layer is made of seaweed-like body, the average diameter of the seaweed-like body is at 0.5 to 10 mm, claims an average aspect ratio of 3 to 40 The porous elastic pavement material in any one of 1-3 .

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