JP2007063958A - Binder for elastic paving and elastic paving material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a binder for elastic paving and capable of acquiring satisfactory paving and excellent in construction performance and resistance to wheel track formation, and provide an elastic paving material using the same. <P>SOLUTION: The binder for elastic paving contains asphalt, an ethylene-vinyl acetate copolymer, and wax. It is preferable that the blending quantity of the wax is between 10-20 wt.%, that the softening point of the wax is between 80-160°C, and that the penetration of the wax is 20 or less at 25°C. It is further preferable that the binder for elastic paving contains a silane coupling agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elastic pavement binder and an elastic pavement material using the same, and more particularly to an elastic pavement binder that can provide a pavement that is excellent in workability and has good resistance to rutting, and an elastic pavement material using the same.

  In recent years, in place of conventional dense pavement, drainage pavement that reduces traffic noise by providing a gap inside the pavement is rapidly spreading. According to this drainage pavement, it is possible to reduce the noise by about 3 dB compared to the conventional one, but since there are many areas where this drainage pavement does not provide sufficient noise reduction, further noise reduction is possible. Technology is required.

  As a technology for this, for example, a soundproof wall has been proposed, but this has problems such as increased construction costs and places that cannot be installed due to landscape problems, so the road paving itself With regard to the improvement of the above, a technique capable of realizing a lower noise is desired.

  Pavements that can achieve superior low noise performance over drainage pavements can be broadly classified as follows: (1) Elastic pavement with waste vulcanized rubber added using urethane resin or epoxy resin binder instead of conventional asphalt binder And (2) asphalt pavement material containing waste vulcanized rubber added to asphalt binder pavement in the form of powder or chips.

  Among these, in elastic pavement using a urethane resin binder, it is possible to reduce the noise by 6 to 10 dB compared to dense pavement because rubber can be highly filled, but on the other hand, (i) urethane, etc. Because of the long curing time of the binder, traffic regulation during construction must be performed for a long time (1-2 days), which may cause traffic congestion, etc. (ii) Because it is a curable binder , When recycling the pavement that has been constructed, it cannot be reused by heating, etc., as with asphalt, and (iii) it is expensive compared to asphalt, so it costs a lot when constructed over a large area such as a road There was a problem such as the occurrence of up.

  Among these problems, the problem of curing time has been devised to accelerate the curing reaction with a curing aid or the like, but if the curing time is too early, it depends on the curing reaction while mixing materials and constructing on the road. Thickening occurs, workability is remarkably lowered, and the finished pavement becomes poor in flatness, resulting in a trade-off that the degree of completion is low.

  In addition, in the asphalt pavement containing waste vulcanized rubber, since the asphalt binder is used, the above three problems in the urethane resin binder can be cleared. On the other hand, (i) asphalt and vulcanized rubber Since the adhesion with the rubber is very low, it causes problems such as rubber scattering, and the durability is lowered, so that high filling of rubber cannot be performed. (Ii) Asphalt and modified asphalt currently used The high-viscosity asphalt binder has a problem that it has a lower rigidity than the urethane resin binder and cannot withstand the weight of the vehicle when paved, and rubbing is likely to occur.

  For this reason, in the asphalt rubber-containing pavement material, the volume ratio of the rubber to the whole is about 5% at most, and the present condition is that the asphalt pavement material highly filled with rubber has not been studied. As a result, the noise reduction effect obtained by these pavement materials is only the same level as or slightly improved from drainage pavement, and it has not been possible to achieve a sufficiently low noise.

  Therefore, the applicant of the present application can perform secondary recycling at low cost in order to simultaneously solve the problems of (1) paving material using a urethane resin binder and (2) paving material using an asphalt binder. As an elastic pavement material using such asphalt as a binder, a new asphalt pavement additive (Patent Document 1), an asphalt-based elastic pavement material (Patent Document 2), and the like have been proposed.

In addition, as an improvement technique related to asphalt pavement, for example, Patent Document 3 discloses an asphalt for the purpose of obtaining a modified asphalt composition with good mixing uniformity of the modifier and asphalt and with suppressed phase separation. In addition, a technique for containing a specific wax in rubber and / or thermoplastic elastomer as a modifier is described. Patent Document 4 describes an asphalt pavement mixture obtained by adding and mixing a predetermined wax to a mixture mainly composed of aggregate and asphalt.
JP 2002-201601 A (Claims etc.) JP 2002-201311 A (Claims etc.) JP 2003-55559 A (Claims etc.) JP 2003-302905 A (Claims etc.)

  However, the asphalt-based elastic pavement has a problem that a large amount of a modifier is required to maintain sufficient strength, and the viscosity tends to be high, so that the workability is poor. In addition, asphalt-based elastic pavement is highly heat-dependent, so there is a problem that rubbing is likely to occur at high temperatures, and the conventional improved technology has not been sufficiently solved.

  Accordingly, an object of the present invention is to provide an elastic pavement binder and an elastic pavement material using the same, which can provide a pavement that is more excellent in workability than the conventional one and has good resistance to rutting.

  As a result of intensive studies, the present inventors have found that by adding wax at the time of preparing a binder for asphalt-based elastic pavement, the workability is improved, and good rubbing resistance is realized in the pavement after construction. As a result, the present invention has been completed.

  That is, the elastic pavement binder of the present invention is characterized by containing asphalt, an ethylene vinyl acetate copolymer, and a wax.

  In the elastic pavement binder of the present invention, the blending amount of the wax is preferably 10 to 20% by weight. The softening point of the wax is preferably 80 ° C. or higher and 160 ° C. or lower, and the penetration of the wax at 25 ° C. is preferably 20 or lower. The elastic pavement binder of the present invention preferably further contains a silane coupling agent.

  The elastic paving material of the present invention is the elastic paving material containing a binder, an aggregate, rubber chips and / or rubber powder, wherein the elastic paving binder of the present invention is used as the binder. It is what.

  According to the present invention, the above-described configuration realizes an elastic pavement binder that can provide a pavement that is superior in workability and has good resistance to rubbing compared to conventional ones, and an elastic pavement material using the same. It became possible.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The binder for elastic pavement of the present invention contains asphalt, ethylene vinyl acetate copolymer (EVA), and wax. By adding wax to the asphalt-based binder, it is possible to improve workability and to suppress the decrease in storage elastic modulus at high temperatures, and to improve the rubbing resistance of the obtained pavement. became.

  The asphalt that can be used in the binder of the present invention is not particularly limited, and conventional asphalt, for example, straight asphalt, semi-blown asphalt, blown asphalt, asphalt emulsion, tar, pitch, oil and the like are added. Examples include cutback 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.

  The wax is not particularly limited, and any of natural wax and synthetic wax such as petroleum wax can be used. For example, paraffin wax, microcrystalline wax, liquid paraffin wax, paraffinic synthetic wax, polyethylene wax, Examples thereof include hydrocarbon waxes, but are not limited thereto. Such waxes may be used alone or in combination of two or more. The wax used in the present invention preferably has a softening point of 80 ° C. or higher and 160 ° C. or lower, particularly 90 ° C. or higher and 130 ° C. or lower. Further, the penetration at 25 ° C. is preferably 20 or less, more preferably 8 or less. The blending amount of the wax in the binder of the present invention is preferably 10 to 20% by weight.

  In addition, the binder of the present invention preferably further contains a silane coupling agent, and this also provides the adhesion of the stone surface, so that the durability can be further enhanced. 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 about 0.2 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.

  Moreover, in order to improve workability | operativity in a binder, 1-40 weight% of low molecular weight petroleum resins can be contained.

  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 elastic paving material of the present invention contains a binder, an aggregate, rubber chips and / or rubber powder, and uses the elastic paving binder of the present invention as a binder. The ratio of the binder in the elastic paving material of the present invention can be about 10 to 35% by weight.

  There is no restriction | limiting in particular as an aggregate used in this invention, Recycled aggregates, such as natural aggregates, such as river gravel and river sand, and crushed stone, slag, concrete, glass, and FRP, can be used. 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. The coarse aggregate mainly forms a porous structure in order to obtain water permeability, and a hard aggregate 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. The proportion of aggregate in the elastic pavement material of the present invention is preferably 35 to 55% by weight. If this proportion is less than 35% by weight, the strength is not sufficient, while if it exceeds 55% by weight, sufficient elasticity and bass effect cannot be obtained, which is not preferable.

  The material of the rubber chip and / or rubber powder is not particularly limited, and natural rubber, isoprene rubber, styrene-butadiene rubber, butyl rubber, ethylene-propylene rubber, or the like can be used. Such rubber can be obtained from used waste materials such as rubber tires, weather strips, hoses, etc., unnecessary end materials generated during molding, molding defects, and the like. The proportion of rubber in the elastic pavement material of the present invention is preferably 20 to 70% by weight. If this proportion is less than 20% by weight, the effect as an elastic paving material is not sufficient. On the other hand, if it exceeds 70% by weight, sufficient physical properties for application to asphalt pavement cannot be obtained, which is not preferable.

  The oil used at the time of mixing is not particularly limited. For example, among petroleum oils having three compositions of an aromatic ring, a naphthene ring, and a paraffin chain, an aromatic having an aromatic carbon with a ring analysis result of 36% or more. System oil can be used preferably.

Hereinafter, the present invention will be described in more detail with reference to examples.
EVA (EV210ET, manufactured by Mitsui DuPont Polychemical Co., Ltd.), Fischer-Tropsch wax (FT100, manufactured by Nippon Seiki Co., Ltd.), straight asphalt (25 ° C. penetration 60-80), amino silane cup A ring agent (KBM603, manufactured by Shin-Etsu Silicone Co., Ltd.) was mixed with the formulation shown in Table 1 below, and stirred at 180 ° C. to prepare elastic pavement binders for each example and comparative example. did.

(Measurement of 180 ° C viscosity)
Using a DV-II + VISCOMETER made by BROOKFIELD and a jig 1 (NO. 27, φ12 mm × 40 mm), the 180 ° C. viscosity of the binder 10 was measured as shown in FIG. The rotation speed of the jig 1 was 20 rpm.

(Measurement of storage elastic modulus G ′ at 60 ° C.)
By using a viscoelasticity measuring device Anton Paar MCR-301 manufactured by Nippon Sebel Hegner Co., Ltd., as shown in FIG. Was measured. The diameter of the jig 2 was φ25 mm, and the distance between the jigs 2 was 1 mm. The swing angle γ of the jig 2 was 0.1%, and the frequency f was 1 Hz.

(G ^* / sinδ)
G ^* / sin δ was determined as an index of the resistance to rutting. As this value is increased, rutting is less likely to occur and the binder is better.
These results are also shown in Table 1 below.

  As a result, it was confirmed that the binders of Examples 1 and 2 to which the wax was added had better workability than the binder of the comparative example to which no wax was added, and that the resulting body can have good resistance to rutting. .

It is a schematic explanatory drawing of the measuring apparatus used for 180 degreeC viscosity measurement. It is a schematic explanatory drawing of the measuring apparatus used for 60 degreeC storage elastic modulus G 'measurement.

Explanation of symbols

1, 2 Jig 10 Binder

Claims (6)

  An elastic pavement binder comprising asphalt, an ethylene vinyl acetate copolymer, and a wax.   The elastic paving binder according to claim 1, wherein the amount of the wax is 10 to 20% by weight.   The elastic pavement binder according to claim 1 or 2, wherein the wax has a softening point of 80C or higher and 160C or lower.   The penetration for elastic pavement according to any one of claims 1 to 3, wherein the penetration of the wax at 25 ° C is 20 or less.   Furthermore, the binder for elastic pavements as described in any one of Claims 1-4 containing a silane coupling agent.   In the elastic pavement material containing a binder, an aggregate, and a rubber chip and / or rubber powder, the elastic pavement binder according to any one of claims 1 to 5 is used as the binder. Elastic pavement material.

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