JP2007154539A - Low noise pavement body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low noise pavement body preventing decrease in noise reducing effect with use by preventing clogging inside the pavement while maintaining the noise reducing effect of the pavement itself, and excelling in cost and recycling properties. <P>SOLUTION: The low noise pavement body is constituted by filling an elastic paving material 2 comprising asphalt and an ethylene vinylacetate copolymer as a binder, aggregate and rubber chips and/or rubber powder, in voids near a surface layer part in the porous pavement body 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a low-noise pavement (hereinafter also simply referred to as “pavement”), and more particularly to a low-noise pavement that can prevent clogging of the pavement while maintaining a noise reduction effect.

  Conventionally, as a low-noise pavement, a porous drainage pavement in which a traffic noise is reduced by providing a gap inside the pavement using a large particle size aggregate is known. A low-noise elastic pavement using vulcanized rubber in the form of powder or chips, using these as aggregates, and using a curable resin such as urethane or epoxy as a binder is also known.

  However, the elastic pavement using curable resins such as urethane and epoxy has a slow cure, so the traffic regulation must be performed for a long time (1, 2 days) during curing, and the workability is poor. There was a problem that secondary recycling was impossible. Furthermore, since elastic pavement using a urethane binder is expensive in cost, this point is also a drag on the spread.

On the other hand, in this applicant, instead of conventional curable binders such as urethane and epoxy, various investigations have been conducted on elastic pavement using asphalt that can be secondarily recycled at low cost as a binder, Proposals have been made for elastic pavement materials using ethylene vinyl acetate copolymer (EVA), which is a thermoplastic resin, as a binder with asphalt (for example, Patent Documents 1 and 2). For example, Patent Document 3 discloses a method for constructing a low-noise pavement in which a porous pavement is formed as a base, and a void near the surface is filled with elastic porous mortar.
Japanese Patent Application No. 2004-38513 Japanese Patent Application No. 2005-004509 Japanese Patent Laid-Open No. 10-140509 (claims, etc.)

  As described above, the drainage pavement has a porous structure having voids, and exhibits low noise effects due to the voids. However, such drainage pavement has a problem that, due to clogging inside the pavement due to use, voids disappear and the low noise effect is lost.

  Therefore, the object of the present invention is to solve the above problems, maintain the noise reduction effect of the pavement itself, prevent clogging inside the pavement, and prevent the reduction of noise reduction effect due to use, And it is providing the low noise pavement excellent also in cost efficiency and recyclability.

  As a result of intensive studies, the inventors of the present invention have characterized the features of drainage pavement by filling an elastic pavement material using an asphalt binder into the surface layer portion of a porous pavement having many voids such as drainage pavement. The present inventors have found that the occurrence of clogging, which is a problem, can be reduced without losing the noise reduction effect.

  That is, the drainage pavement of the present invention includes asphalt and ethylene vinyl acetate copolymer (EVA) as a binder, aggregate, rubber chip, and / or rubber powder in the space near the surface layer portion of the porous pavement. It is characterized by being filled with an elastic paving material containing.

  In the present invention, the elastic pavement material is preferably filled to a depth of at least 10 mm from the surface of the porous pavement. Preferably, the porosity of the porous pavement is in the range of 10 to 40%, and the porosity of the elastic pavement material is in the range of 10 to 50%. Furthermore, the content of the binder in the elastic pavement material is preferably in the range of 10 to 35% by weight, and the maximum particle size of the rubber chip and / or rubber powder is in the range of 1 to 5 mm. Is preferred.

  According to the present invention, the above-described configuration makes it possible to prevent clogging inside the pavement while maintaining the noise reduction effect of the pavement itself, and to reduce the noise reduction effect associated with use. It became possible to realize a pavement. In addition, since a thermoplastic binder is used for the elastic pavement material filled in the pavement, it has the merit of being easy to reuse and excellent in cost.

  In addition, as described above, Patent Document 3 discloses a technique for filling an elastic porous mortar in a space near the surface of a porous pavement, but this technique is used for this elastic porous mortar. Since the binder is mainly urethane resin, the problem of cost and recyclability has not been solved.

Hereinafter, preferred embodiments of the present invention will be described in detail.
In FIG. 1, the schematic sectional drawing of the low noise pavement of this invention is shown. As shown in the figure, the pavement of the present invention is an elastic pavement material containing asphalt and EVA as binders, aggregates, rubber chips and / or rubber powder in the voids near the surface layer portion of the porous pavement 1. 2 is filled.

  Disadvantages of drainage pavement by filling the gap near the surface layer of porous pavement such as drainage pavement with elastic pavement material using binder that mixes asphalt and EVA as resin modifier It is possible to prevent clogging. Further, in this case, since the elastic pavement material 2 as a filler also has a void structure, the porous pavement 1 itself does not have a significant obstacle to water permeability, low noise characteristics, etc. With respect to the characteristics, since the road surface generated sound generated by the tire or the like can be reduced by the elasticity of the rubber filled in the voids in the surface layer portion, the effect is not impaired.

  In the low-noise pavement of the present invention, it is preferable that the elastic pavement material 2 is filled to a depth of 10 mm from at least the surface of the porous pavement 1. If the filling depth of the elastic pavement material 2 is shallow, the elastic pavement material may be peeled off, reducing the low noise effect. On the other hand, if the filling depth is too deep, no further effect can be obtained. .

  As the porous pavement 1 according to the present invention, a drainage pavement having a porosity of 10 to 40%, particularly 15 to 25% is suitable. If the porosity of the porous pavement 1 is too low, the porous pavement 1 may be broken due to insufficient strength. On the other hand, if the porosity is too high, the water permeability is low, which is not preferable. Moreover, as the elastic pavement material 2 with which the inside of the space | gap of such a porous pavement 1 is filled, a thing with a porosity of about 10 to 50% can be used conveniently. If the porosity of the elastic pavement material 2 to be filled is too low, the elastic pavement material 2 may be peeled off due to insufficient strength. On the other hand, if the porosity is too high, the water permeability becomes low and the low noise effect becomes low.

  The asphalt used for the binder of the elastic pavement material 2 is not particularly limited, and a conventional asphalt, for example, straight asphalt, semi-blown asphalt, blown asphalt, asphalt emulsion, or a cut added with tar, pitch, oil, etc. Examples include back asphalt and recycled asphalt. These can be used alone or in combination of two or more. The asphalt may be decolorized asphalt.

  Moreover, as EVA, what can be obtained in markets, such as EV210ET (made by Mitsui DuPont Chemical Co., Ltd.), EVA720, EVA680, EVA710 (made by Tosoh Corporation), can be used conveniently, for example. The vinyl acetate unit in EVA is preferably 10% by weight or more in order to enhance the adhesion to rubber. The durometer A hardness in accordance with EVA JIS K7215 is preferably 70 or more from the viewpoint of strength. In the binder of this invention, it is preferable to mix | blend EVA at 30-80 weight part with respect to 20-70 weight part of asphalt.

  In the present invention, it is preferable to further contain a silane coupling agent in the binder. This also provides the adhesion of the stone surface, so that the durability can be further increased. As the silane coupling agent, those available in the market can be used as appropriate, and are not particularly limited, but among them, amino-based silane coupling agents are suitable. For example, Shin-Etsu Chemical Co., Ltd. KBM603, KBM903, etc. made from) can be used conveniently. As a compounding quantity of a silane coupling agent, it can be set as about 0.1 to 5 weight% with respect to all the binders, for example.

  In addition, other thermoplastic elastomers can be added to the binder, for example, in order to improve strength and the like. Examples of such other thermoplastic elastomers include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-ethylene-butylene-styrene copolymer (SEBS). One type or a combination of two or more types can be appropriately selected and used. The compounding quantity of these other thermoplastic elastomers can be about 10-50 weight% with respect to all the binders, for example.

  The binder may contain 1 to 40% by weight of a low molecular weight petroleum resin in order to improve workability.

  The viscosity of the binder is preferably 10 Pa · s or less from the viewpoint of workability, and the binder may be in the form of pellets having a particle size of 5 to 10 mm or in the form of powder. The binder content in the elastic pavement material 2 according to the present invention is preferably in the range of 10 to 35% by weight.

  The material and the like of the rubber chip and / or rubber powder are not particularly limited, and natural rubber, isoprene rubber, styrene-butadiene rubber, butyl rubber, ethylene-propylene rubber, and the like can be used. In addition, it can be obtained from used waste materials such as hoses, unnecessary end materials generated during molding, molding defects, and the like. In the present invention, it is preferable to use a rubber chip and / or rubber powder having a maximum particle size of about 1 to 5 mm. If the maximum particle size of rubber is too large, the rubber chip and / or rubber powder penetrates into the voids of the porous pavement 1. The elastic pavement material 2 may not be filled to an appropriate depth.

  The aggregate is not particularly limited, and any of natural aggregate and recycled aggregate can be used. Examples thereof include crushed stones such as river gravel and river sand, silica sand, silica sand, slag, concrete, glass, and FRP. It is done. The stone, sand, and the like used for the aggregate are for ensuring the strength and wear resistance of the completed pavement and for exposing to the surface to obtain an anti-slip effect. The stone materials preferably have a function of meshing with each other to disperse the load. For this reason, a sharp object such as a crushed stone is suitable. Further, it is preferable to mix 5% by volume or more of fine aggregate having a particle size of 0.5 mm or less with respect to coarse aggregate having a particle size of 0.5 to 30 mm. As the coarse-grained aggregate, a hard one having a sharp shape like a crushed stone that meshes with each other to form a gap is suitable. On the other hand, the fine-grained aggregate adheres to the surface of the large-sized coarse-grained aggregate and brings about an anti-slip action (polishing effect like sandpaper) on the tire or the like.

  In forming the low-noise pavement of the present invention, after forming the porous pavement 1 such as drainage pavement, the surface of the void in the vicinity of the surface layer is rubbed with the mixture of the elastic pavement material 2 on the surface. The elastic pavement material 2 may be filled in.

It is a schematic sectional drawing which shows the low noise pavement which concerns on one embodiment of this invention.

Explanation of symbols

1 Porous pavement 2 Elastic pavement material

Claims (6)

  The inside of the void near the surface layer portion of the porous pavement is filled with an elastic pavement material containing asphalt and ethylene vinyl acetate copolymer as a binder, aggregate, rubber chips and / or rubber powder. Low noise pavement.   The low-noise pavement according to claim 1, wherein the elastic pavement material is filled at least to a depth of 10 mm from the surface of the porous pavement.   The low-noise pavement according to claim 1 or 2, wherein the porosity of the porous pavement is in the range of 10 to 40%.   The low-noise pavement according to any one of claims 1 to 3, wherein the elastic pavement material has a porosity of 10 to 50%.   The low-noise pavement according to any one of claims 1 to 4, wherein a content of the binder in the elastic pavement material is in a range of 10 to 35% by weight.   The low noise pavement according to any one of claims 1 to 5, wherein a maximum particle size of the rubber chip and / or rubber powder is in a range of 1 to 5 mm.

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