JP2000219552A - Non-colored coating aggregate for pavement and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-colored aggregate for pavement, which is free from the fear of being stuck to rolling rollers or tires for vehicles, capable of opening road in early stage and constructing a spray type surface treated layer having durability. SOLUTION: The non-colored covering aggregate for pavement composed of the non-colored aggregate having a coating layer of a granular material stuck thereto with a binder is provided and the producing method of the non- colored aggregate for pavement, which contains a process for forming the coating layer of the binder on the surface of the aggregate by mixing the aggregate with the binder and a process for forming the coating layer of the granular material on the coating layer of the binder by adding the granular material and further mixing, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-colored coated aggregate for pavement and a method for producing the same, and more particularly, to a non-colored coated aggregate for pavement provided with a coating layer of a granular material and a method for producing the same. is there.

[0002]

BACKGROUND OF THE INVENTION Road pavement has become
The aging and deterioration gradually progress, and the road surface may be worn to generate irregularities, and the pavement surface may have cracks or the like. If the irregularities and cracks are left, the safety of the passing vehicle may be threatened, and rainwater or the like may permeate through the cracks into the inside of the pavement and cause damage or destruction of the pavement itself. Conventionally, as a method of repairing such aged and deteriorated road pavement, a spraying type surface treatment method and a mixed type surface treatment method, and even an overlay method have been proposed.
Above all, the spraying surface treatment method has attracted attention as a relatively simple method for repairing aged or deteriorated road pavement.

[0003] The spraying surface treatment method is a process of spraying a binder made of bituminous material such as asphalt in a film shape on a road surface having irregularities or cracks, and then spraying an aggregate thereon. This is a method in which the aggregate is bonded to the road surface by a binder once or a plurality of times, and one or more layers composed of the binder and the aggregate are formed on the road surface.

This spray-type surface treatment method is relatively effective as a method for repairing an aged or deteriorated pavement, since the surface of the pavement can be repaired relatively easily. Aggregate in the surface treatment layer is rotated by pressure work or the passage of vehicles after opening of traffic, and the lower surface of the aggregate with the binder used for surface treatment appears on the surface of the surface treatment layer. There was a thing. When the surface of the aggregate to which the binder used in the surface treatment has adhered appears on the surface of the surface treatment layer, the binder adheres to the rolling rollers and vehicle tires passing over the surface, and furthermore, even the aggregate. Adheres to the compaction roller and the vehicle tire together with the binder, and is dissipated from the constructed surface treatment layer. If the aggregate is dissipated, not only will the constructed surface treatment layer not fulfill its original function, but also the binder will appear directly on the road surface, so the road surface will flash,
There is a danger that the vehicle becomes extremely slippery, causing a slip of a passing vehicle or the like, and eventually causing a traffic accident.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks of the prior art. It is an object of the present invention to provide a pavement non-colored aggregate capable of constructing a durable spray-type surface treatment layer that can be opened at an early stage without danger of adhering, and a method for producing the same. is there.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted research on aggregates used in a spraying type surface treatment method and a method for manufacturing the aggregates. As a result, the surface of the aggregates is covered with a powdery material via a binder. By doing so, there is no adhesion of aggregates and binders used for surface treatment to the compacting rollers and vehicle tires, and also, a spray-type surface treatment that is excellent in binding to the road surface and adhesion between aggregates The inventors have found that a non-colored aggregate for a construction method can be obtained, and completed the present invention.

[0007] That is, the present invention provides a non-colored coated aggregate for pavement comprising a non-colored aggregate having a coating layer of a granular material adhered via a bonding material, and binds to the non-colored aggregate. A step of building a coating layer of a binder on the surface of the aggregate by mixing with the material, and then adding and mixing the powder and granule to form a coating layer of the powder and granule on the coating layer of the binder This problem is solved by providing a method for producing a non-colored coated aggregate for pavement, comprising the steps of:

In the non-colored coated aggregate for pavement of the present invention, since the aggregate has a coating layer of a powdery material adhered via a binder on the surface thereof, it can be stored during storage. In the above, aggregates do not adhere to each other and there is no risk of disturbing handling such as spraying, and at the same time, after being sprayed on the road surface, a part of It adheres and prevents direct contact between the compacted rollers and vehicle tires and the dispersed aggregates, and acts as a so-called anti-adhesive agent. It is possible to open the traffic early without sticking to the road. In addition, the binder and the particulate material existing on the aggregate surface remain unchanged when they are present in a mixed state from the beginning, and when the vehicle is initially opened as a separate coating layer after traffic opening. Gradually mix with each other as they pass, forming a binder / powder material mixture (so-called filler bitumen), and the adhesion and bonding strength between the aggregate and the road surface and between the aggregates. Strengthen.
In particular, when using a material that hardens and exhibits adhesive strength or bonding force by itself as a hydraulic material such as a hydraulic inorganic material, it hardens by reacting with moisture or the like existing on the road surface or in the vicinity, Since the adhesive force and the bonding force between the aggregate and the road surface and between the aggregates are further increased, a strong and highly durable surface treatment layer can be constructed.

In the non-colored coated aggregate for pavement of the present invention, it is sufficient that the coating layer of the granular material is adhered to the surface of the aggregate through a binder, and the coating layer is bonded to the coating layer of the granular material. It may be present on the aggregate surface in a state where it is clearly distinguishable from the coating layer of the aggregate, or both may be present in unison, or in a state intermediate between them. However, from the viewpoint of adhesion to the compaction roller and the vehicle tire, it is desirable that the coating layer of the granular material be present on the surface of the aggregate as a separate layer on the coating layer of the binder.

[0010] In order to attach the coating layer of the granular material to the surface of the aggregate via the binder, first, the aggregate and the binder are put into a mixer / mixer such as a mixer and mixed to form a mixture on the surface of the aggregate. After constructing the covering layer of the binder, the granular material may be charged and further mixed to form the covering layer of the granular material on the covering layer of the binder, or may be combined with the aggregate. The material and the granular material may be simultaneously put into a mixing / stirring machine, and the three components may be mixed at the same time to form a coating layer in which the binder and the granular material are perfectly integrated on the surface of the aggregate. Furthermore, by pre-mixing the binder and the particulate material and the aggregate, mixing the aggregate and the binder to form a completely integrated coating layer on the surface of the aggregate. Is also good.

As the binder to be used, any binder can be used as long as it can be used for road pavement, and any of a heating type and a normal temperature type can be used. From the viewpoint that there is no consumption or generation of CO ₂ gas and there is little danger during construction, a room temperature type is desirable.

The amount of the binder used for the non-colored coated aggregate for pavement of the present invention is 0.1 to 3 with respect to 100 parts by weight of the aggregate.
The range of parts by weight is preferred, and especially 0.4 to 1.5 parts by weight is more preferable, and 0.4 to 1.0 part by weight is still more preferable. If the amount of the binder is less than 0.1 part by weight, the amount of the binder with respect to the aggregate is too small, so that effective coating may not be performed. Conversely, if the amount exceeds 3 parts by weight, the amount of the binder with respect to the aggregate Is too large, the bonding force between the aggregate and the road surface or between the aggregates is reduced, and adhesion of the bonding material to the compaction roller or the vehicle tire is observed.

The amount of the granular material used in the non-colored coated pavement of the present invention is 0.5 to 1 with respect to 100 parts by weight of the aggregate.
The range of 5 parts by weight is preferable, and among them, 1.0 to 5 parts by weight is particularly preferable. If the amount of the powder material is less than 0.5 parts by weight,
If the amount of the particulate material relative to the aggregate is too small, effective coating may not be possible. Conversely, if it exceeds 15 parts by weight, the amount of the particulate material relative to the aggregate is too large, and between the aggregate and the road surface or The bonding force between the aggregates is reduced, and smoke is generated when handling the aggregates. In addition, in the non-colored coated aggregate for pavement of the present invention, it is desirable that the amount of the granular material is larger than the amount of the binder.

The non-colored coated aggregate for paving of the present invention is desirably used as an aggregate for a spray-type surface treatment method, but has the excellent properties of the non-colored coated aggregate for paving of the present invention. It can also be used as a pavement aggregate or a surface spray aggregate when producing other pavement mixtures. There is no particular limitation on the particle size of the aggregate to be used, but a single particle size is preferable. In particular, as the aggregate for the spraying surface treatment method, the minimum particle size of the aggregate is 10 mm in the nominal size of the sieve opening.
When the difference between the minimum particle size and the maximum particle size is 2 mm or more and less than 5 mm in the nominal size of the sieve opening, and when the minimum particle size is 10 mm or more in the nominal size of the sieve opening The difference between the minimum particle size and the maximum particle size is that the nominal size of the sieve opening is more than 3 mm and that the aggregate is a single particle size of 6 mm or less, from the viewpoint of the durability of the constructed surface treatment layer. desirable.

The non-colored aggregate or non-colored material referred to in the present invention includes red, green, orange, yellow, brown, white, etc., as aggregates used for general pavement not intended for color pavement. Aggregate that has no color, or means that it does not have such a color, and is an achromatic color or a color that is close to achromatic, such as general-purpose aggregates such as crushed stone used for ordinary pavement And, if non-colored, an aggregate having characteristics such as light reflectivity, brilliancy, fluorescence, and light storage. In addition, if the aggregate has characteristics such as light reflectivity and brilliancy, fluorescence, and luminous properties, if such an aggregate surface is covered with a coating layer such as a binder or a granular material, Initially, the properties such as light reflectivity, brilliancy, fluorescence, and luminous properties of the aggregate will not be exhibited, but such aggregates were used for actual pavement and opened to traffic Later, due to the friction of the passing vehicle tires, etc., the coating layer such as the binder on the aggregate surface is gradually scraped off, the aggregate surface appears on the pavement surface, light reflectivity, glitter, fluorescence, phosphorescence There is an effect that the inherent properties of the aggregate such as the properties are exhibited.

The non-colored coated aggregate for pavement of the present invention is not limited to ordinary roads, but may also be used for motorways, campus roads, park roads,
It is also applied to paving such as walking paths, bicycle paths, sports grounds, parking lots, airfields, harbor facilities, public halls, and plazas, wide sidewalks, etc.
It can also be used to construct surface layers in new construction.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

First, the materials used will be described. <Aggregate> The non-colored aggregate used in the present invention is any non-colored aggregate among the pavement aggregates described in the `` Asphalt Pavement Outlines '' issued by the Japan Road Association. What is used can also be used, for example, crushed stone, cobblestone, gravel, steel slag, and the like. Further, asphalt-coated aggregates in which these aggregates are coated with asphalt or artificial asphalt described later, recycled aggregates, and the like can also be used. In addition, it is possible to use artificially fired aggregates, fired expanded aggregates, artificial lightweight aggregates, ceramic particles, loxobites, aluminum particles, plastic particles, ceramics, emery, construction waste materials, fibers, etc. it can. These aggregates may be used alone or in combination of two or more.

The light-reflective, brilliant, fluorescent and / or luminous aggregates used in the present invention include glass beads, silicon carbide particles, fused alumina-based artificial aggregates, and limestone-based artificial bones. Material, feldspar, quartz, aluminum silicofluoride grains,
Examples include glass scraps such as broken glass bottles, fluorescent artificial aggregates, and phosphorescent aggregates.

Among the above aggregates, the aggregate used for the lowermost layer in the spraying type surface treatment method is described in Japanese Patent Application No. 10-278787 by the same applicant. When the minimum particle size of the aggregate is less than 10 mm in the nominal size of the sieve opening, the difference between the minimum particle size and the maximum particle size is 2 mm or more and less than 5 mm in the nominal size of the sieve opening. In addition, when the minimum particle size is 10 mm or more in the nominal size of the sieve opening, the difference between the minimum particle size and the maximum particle size is more than 3 mm and 6 mm or less in the nominal size of the sieve opening. desirable. Note that the “nominal size of the sieve opening” referred to in this specification is a nominal size that is commonly used when expressing a sieve, and is a standard size of a mesh sieve opening defined by JISZ8801. Are in a correspondence relationship as shown in Table 1.

[0021]

[Table 1]

That is, in the present specification, the minimum size of the aggregate is less than 10 mm in the nominal size of the sieve opening is that the reference size of the mesh of the mesh sieve specified in JIS Z8801 is 9. It means that it contains aggregate particles passing through a 5 mm sieve, and that the minimum particle size of the aggregate is 10 mm or more in the nominal size of the sieve opening means that the aggregate is JIS Z88.
The standard size of the mesh sieve specified in 01 is 9.5m
m means that it does not contain aggregate particles passing through the sieve. In addition, the difference between the minimum particle size and the maximum particle size is 2 mm or more in the nominal size of the sieve aperture, and when the minimum particle size is 5 mm in the nominal size of the sieve aperture, the maximum particle size of the aggregate A diameter sieve shall pass at least a sieve having a nominal size of at least 2 mm greater than 5 mm, i.e., a sieve having a nominal size of 7 mm, but not passing through a sieve having a nominal size of 6 mm smaller than that. Means and also
When the difference between the minimum particle size and the maximum particle size is less than 5 mm in the nominal size of the sieve aperture, when the minimum particle size is 5 mm in the nominal size of the sieve aperture, the maximum particle size of the aggregate The sieve has a nominal size of less than 5 mm than 5 mm,
That is, it means passing through a sieve having a nominal size of 8 mm. Similarly, when the difference between the minimum particle size and the maximum particle size is more than 3 mm and 6 mm or less in the nominal size of the sieve aperture, when the minimum particle size is 10 mm in the nominal size of the sieve aperture, The largest particle size of the population is at least a sieve having a nominal size of 3 mm larger than 10 mm, ie, a sieve having a nominal size of 6 mm larger than 10 mm without passing through a sieve having a nominal size of 13 mm, that is, a sieve having a nominal size of 16 mm. Means passing through a sieve.
Note that whether to pass through the sieve or not to pass through is a judgment at a substantial and common sense level, and that some dust-like substances pass through the sieve or If any grains remain on the sieve, but are negligible in the aggregate aggregate, they shall not affect the decision not to pass through the sieve. Hereinafter, in this specification, unless otherwise specified, the particle size and particle size of the aggregate are based on the nominal size of the sieve opening.

The upper and lower limits of the particle size of the aggregate used for the lowermost layer in the spraying type surface treatment method are not particularly limited as long as the above-mentioned particle size conditions are satisfied. Particle size is 5mm or more, maximum particle size is 20m
m or less is preferable. If the minimum particle size is less than 5 mm,
If the particle size of the aggregate is too small and there are irregularities or cracks on the road surface, the cracks or irregularities may not be effectively covered. In addition, the spread thickness of the aggregate itself approaches the layer thickness of the binder scatter layer formed on the road surface by the scattered binder, and in some cases, the spread of the aggregate is greater than the layer thickness of the binder. The thickness becomes smaller, which is one of the causes of flash. On the other hand, if the maximum particle size exceeds 20 mm, not only does the road surface after construction become rough, but also the vehicle travels on the surface treatment layer, thereby increasing traffic noise generated by the vehicle and reducing aggregates. Scattering may occur, which is not preferable.

<Binder> As the binder used in the present invention, asphalt, artificial asphalt, emulsions thereof,
Resins, paints, adhesives, pavement tars, cutback asphalt, and the like.

Examples of the asphalt to be used include natural asphalt such as lake asphalt, straight asphalt, blown asphalt, semi-blown asphalt, and petroleum asphalt such as solvent deasphalted asphalt (for example, propane deasphalted asphalt). May be used alone or in combination of two or more.

As the artificial asphalt to be used, it is desirable to use a substantially colorless artificial asphalt. One example of such a substantially colorless artificial asphalt is, for example, a petroleum-based blended oil and a petroleum resin. , By weight percentage, petroleum blended oil: petroleum resin = (60-85
%): Some compounds are blended at a ratio of (40 to 15%).
If the proportion of the petroleum blended oil is less than 60% by weight, the viscosity of the obtained binder will be too high and the workability will be reduced.
On the other hand, if the ratio of the petroleum compound oil exceeds 85% by weight, the viscosity and the adhesiveness and the tackiness are undesirably reduced, though the viscosity is reduced. The artificial asphalt obtained in such a formulation is substantially colorless, for example, light reflective, brilliant,
Even when used with an aggregate having characteristics such as fluorescence and luminous properties, the characteristics of the aggregate are not impaired, and the original characteristics of the aggregate are fully exhibited. Here, “substantially colorless” means that the aggregate used as described above is colorless to such an extent that it does not impair the properties such as light reflectivity, brilliancy, fluorescence, and light storage that the aggregate originally has. Therefore, it is not always necessary to be completely transparent, and it may be translucent or have a slight candy color. In addition, even when the binder is not substantially colorless at the time of use, it may be substantially colorless at a stage where the reaction and the decomposition progress and a predetermined strength as a binder is developed.

The petroleum-based compounded oil is also called a process oil, and is an aromatic oil having an aromatic carbon number of 35% or more of the total carbon number, a naphthene having a naphthene ring carbon number of 30 to 45% of the total carbon number. And a paraffinic system in which the number of carbon atoms in the paraffin side chain is 50% or more of the total number of carbon atoms, and one or more of these are used as appropriate.

As the petroleum resin, an aliphatic (C5) petroleum resin mainly composed of a fraction having a boiling point of 20 to 60 ° C. (C5 fraction) separated by distillation of a naphtha decomposition product; The boiling point of the product separated by distillation is 16
Aromatic (C9-based) petroleum resin mainly containing a fraction at 0 to 260 ° C. (C9 fraction), and an aliphatic / aromatic copolymer (C5) obtained by copolymerizing these C5-based and C9-based petroleum resins. / C9
System) Petroleum resin and alicyclic (DCPD) petroleum resin mainly composed of high-purity dicyclopentadiene separated by distillation of naphtha decomposition product, terpene and phenol are copolymerized There are terpene phenol resins and the like, and one or more of these are used as a mixture.

It is desirable that these asphalts and artificial asphalts are modified with rubber or a thermoplastic polymer to increase the bonding strength or adhesion. The rubber and thermoplastic polymer used for the modification include natural rubber,
Gutter virtual, cyclized rubber, styrene-butadiene rubber,
Styrene / isoprene rubber, isoprene rubber, polyisoprene rubber, butadiene rubber, chloroprene rubber, butyl rubber, halogenated rubber, chlorinated polyethylene, chlorosulfonated polyethylene, ethylene propylene rubber, E
Rubbers such as PT rubber, alphin rubber, styrene / butadiene block copolymer rubber, styrene / isoprene block copolymer rubber, and ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, polyethylene, polyvinyl chloride, poly Thermoplastic polymer such as vinyl acetate, vinyl chloride / vinyl acetate copolymer, vinyl acetate / acrylate copolymer, and the like.
These rubbers or thermoplastic polymers can be used alone or in combination of two or more.

An asphalt in the modified asphalt or an artificial asphalt in the modified artificial asphalt;
The mixing ratio of the rubber and the thermoplastic polymer is preferably in the range of usually 2 to 20 parts by weight based on 100 parts by weight of asphalt or artificial asphalt. If the amount of the rubber and the thermoplastic polymer is less than 2 parts by weight, the performance as the modified asphalt or the modified artificial asphalt cannot be exhibited, and the adhesive strength between the aggregates and between the aggregates and the road surface and the grasp can be determined. While the force is not much different from ordinary asphalt or artificial asphalt, if the amount of rubber and thermoplastic polymer exceeds 20 parts by weight, the cohesive force is too strong, and the peeling from the aggregate is returned. Occurs, and the aggregates are easily scattered. In addition, asphalt used as a binder of the present invention, artificial asphalt,
As the asphalt in the modified asphalt or the artificial asphalt in the modified artificial asphalt, it is preferable to use one having a penetration (25 ° C.) of about 40 to 200 in consideration of the characteristics after use.

The asphalt, artificial asphalt, modified asphalt, or modified artificial asphalt used as the binder of the present invention may further include a thermoplastic solid resin, a solid rubber, a liquid resin, Softeners, plasticizers and the like can be added. Examples of the added tackifier include rosin and derivatives thereof, terpene resins, petroleum resins and derivatives thereof, alkyd resins, alkylphenol resins, terpene phenol resins, cumarone indene resins, synthetic terpene resins, alkylene resins, polyisobutylene, Polybutadiene, polybutene,
Copolymers of isobutylene and butadiene, mineral oil, process oil, pine oil, anthracene oil, pine oil, animal and vegetable oils, polymerization oils, plasticizers, and the like. Further, an antioxidant, an antioxidant, sulfur and the like can be added.

The asphalt emulsion or artificial asphalt emulsion used as the binder in the present invention includes natural asphalt such as lake asphalt, straight asphalt, blown asphalt, semi-blown asphalt, solvent deasphalted asphalt (for example, propane deasphalted asphalt). Bituminous materials, such as petroleum asphalt, heavy oil, tar, pitch, etc., or a mixture of two or more, or artificial asphalt, using various surfactants or emulsifiers such as clay (eg, bentonite), , An acid, a salt, a dispersant, a protective colloid, and the like, if necessary, and emulsified in water with a suitable emulsifier such as a colloid mill, a homogenizer, and a homomixer.

As the emulsifier, any of a cationic type, an anionic type and an amphoteric type can be used.

Examples of the cationic emulsifier that can be used include:
Aliphatic or alicyclic monoamines, diamines, triamines, amidoamines, polyaminoethylimidazolines having long-chain alkyl groups, long-chain hydroxyalkyldiamines, rosinamines, ethylene oxide adducts of these amines, amine oxides, or these amines Water-soluble or water-dispersible salts obtained by allowing an acid such as hydrochloric acid, sulfamic acid, and acetic acid to act on a surfactant, and quaternary ammonium salts of these amine surfactants. In addition, a nonionic surfactant such as a polyoxyethylene alkyl ether, a polyoxyethylene alkyl allyl ether, or an oxyethylene / oxypropylene block copolymer can be used in combination with these surfactants.

The anionic emulsifiers that can be used include:
Higher alcohol sulfate, alkyl allyl sulfonate, alkyl benzene sulfonate, α-olefin sulfonate, higher alcohol ethoxylate, higher alcohol ethoxylate sulfate, soap, modified naphthalene sulfonate and formalin, alkali lignin salt, Lignin sulfonates, alkali salts of casein, polyacrylates and the like can be mentioned.

Examples of the amphoteric emulsifiers that can be used include alkylphenols, mono- and polyhydric alcohol acids, adducts of alkylene oxides such as aliphatics, aliphatic amines, aliphatic amides, and ethanolamines. .

The dispersants and protective colloids used in asphalt emulsions include sodium naphthalenesulfonate, casein, alginic acid, gelatin, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, sodium polyacrylate, ligninsulfonate, Nitrohumates and the like.

The asphalt emulsion or artificial asphalt emulsion used as the binder of the present invention is obtained by adding one or more selected from rubber and thermoplastic polymer to the above-mentioned emulsified and dispersed bitumen. It is preferably used as a modified asphalt emulsion or modified artificial asphalt.

The rubber and thermoplastic high molecular weight polymer used for the modification include natural rubber, rattling, cyclized rubber, styrene / butadiene rubber, styrene / isoprene rubber,
Isoprene rubber, polyisoprene rubber, butadiene rubber, chloroprene rubber, butyl rubber, halogenated butyl rubber, chlorinated polyethylene, chlorosulfonated polyethylene, ethylene propylene rubber, EPT rubber, alffin rubber, styrene-butadiene block copolymer rubber, styrene-isoprene block Rubber such as copolymer rubber, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, polyethylene, polyvinyl chloride, polyvinyl acetate, vinyl chloride / vinyl acetate copolymer, vinyl acetate / acrylate copolymer And other high-molecular-weight thermoplastic polymers. These rubbers or thermoplastic polymers can be used alone or in combination of two or more. These rubbers and thermoplastic polymers are, for example, powder, latex, emulsion, and aqueous, and latex, emulsion, and aqueous are mainly obtained by a post-mix type method. It is used exclusively for asphalt emulsions or artificial asphalt emulsions, but may be used for asphalt emulsions or artificial asphalt emulsions by a premix type method.

The above-mentioned asphalt emulsion, modified asphalt emulsion, artificial asphalt emulsion and modified artificial asphalt emulsion used as the binder of the present invention may further comprise a thermoplastic solid resin or solid rubber as a tackifier. Liquid resins, softeners, plasticizers and the like can be added. Examples of the tackifier to be added include, for example, rosin and derivatives thereof, terpene resins, petroleum resins and derivatives thereof, alkyd resins, alkylphenol resins, terpene phenol resins, cumarone indene resins, synthetic terpene resins, alkylene resins, polyisobutylene, Examples include polybutadiene, polybutene, copolymers of isobutylene and butadiene, mineral oil, process oil, pine oil, anthracene oil, pine oil, animal and vegetable oils, polymerized oils, plasticizers, and the like. Further, an antioxidant, an antioxidant, sulfur and the like can be added. Furthermore, for the purpose of viscosity adjustment, MC, CMC, HEC,
It is also possible to add a water-soluble polymer protective colloid such as PVA or gelatin.

Asphalt in the modified asphalt emulsion,
Alternatively, the mixing ratio of the artificial asphalt in the modified artificial asphalt emulsion and the rubber and the thermoplastic polymer is such that the rubber and the thermoplastic polymer are 2 to 20 parts by weight per 100 parts by weight of the asphalt or the artificial asphalt.
Parts by weight, preferably in the range of 3 to 7 parts by weight. When the amount of the rubber and the thermoplastic polymer is less than 2 parts by weight, the adhesion of the modified asphalt emulsion or the modified artificial asphalt emulsion to the aggregate and the grasping force after the decomposition and curing of the modified asphalt emulsion or the artificial asphalt emulsion are reduced. While the effect of adding the substance is not so much seen, when the amount of the rubber and the thermoplastic polymer exceeds 20 parts by weight, the cohesive force is too strong, and the exfoliation from the aggregate occurs, Aggregate is easily scattered. The asphalt in the asphalt emulsion and the modified asphalt emulsion used as the binder in the present invention, or the artificial asphalt in the artificial asphalt emulsion and the modified artificial asphalt emulsion, take into account the properties after decomposition and curing. It is preferable to use one having a penetration (25 ° C.) of about 40 to 200.

The concentration of the asphalt emulsion, modified asphalt emulsion, artificial asphalt emulsion and the evaporation residue (solid matter) of the modified artificial asphalt emulsion used as a binder in the present invention is usually about 30 to 70% by weight. Preferably, it is more preferably 50 to 68% by weight. If the concentration of the evaporation residue is less than 30% by weight, it cannot be used, but it is difficult to obtain the necessary degree of viscoelasticity as a binder, while the concentration of the evaporation residue is 7%.
If it exceeds 0% by weight, it cannot be said that it can never be used, but it tends to be difficult to secure good workability.

These asphalt emulsions, modified asphalt emulsions, artificial asphalt emulsions and modified artificial asphalt emulsions are used for the purpose of improving heat resistance, preventing deterioration due to ultraviolet rays, improving workability, and improving adhesion. , An ultraviolet absorber, various additives, a viscosity modifier and the like may be added.

Decomposition of asphalt emulsions and artificial asphalt emulsions generally depends on spontaneous decomposition. In some cases, forcible decomposition may be carried out using a decomposition accelerator.

The resins, paints and adhesives used as binders in the present invention include, for example, reactive binders such as epoxy resins, polyurethane resins, bitumen-modified epoxy resins, bitumen-modified polyurethane resins, polyester resins and methacrylate resins. Can be used. In addition, paints and adhesives using these resins, paints and adhesives using resins such as styrene-butadiene copolymer resins, alkyd resins (including those modified with melamine resins and phenolic resins), and synthetic resins Paints and adhesives containing rubber and synthetic resin as main components can also be used.

<Powder and Granular Material> As the powder and granular material used in the present invention, hydraulic inorganic materials, screenings, crushed stone dust,
Sand, stone powder, incinerated ash, clay, talc, fly ash,
Carbon black, rubber granules, cork granules, ceramic granules, plant granules, resin granules, short fibers such as organic / inorganic fibers, pulp, synthetic fibers, carbon fibers, etc., and locally generated soil, etc. Is mentioned.

Examples of the hydraulic inorganic material used in the present invention as a granular material include cement, anhydrous gypsum, hemihydrate gypsum, powdered blast furnace slag, quicklime, slaked lime, and the like. High-strength Portland cement, super-high-strength Portland cement, moderate heat Portland cement, blast furnace cement, silica cement, alumina cement, expansion cement, blast furnace colloid cement,
Colloidal cement, super-hard cement, white stone cement,
Fly ash cement, sulfate-resistant cement, jet cement, and the like.

The stone powder used as the powder material may be a crushed rock, and the sand may be river sand, mountain sand, sea sand, hill sand and the like. Locally generated soils include red soil, black soil, sandy soil, etc. Loamy soil, masago, scoria, kora,
Select, Kuroboku, Shirasu etc. are also mentioned.

Each of the above-mentioned powdery and granular materials has a maximum particle size of less than 2.5 mm, and in actual use, one or more of them may be used in combination. However, among them, hydraulic inorganic materials are preferred because they have properties of hardening themselves and exhibiting adhesiveness and bonding property, and cement is most preferred.

Next, a method for producing the non-colored coated aggregate for pavement of the present invention will be described.

The non-colored coated aggregate for pavement of the present invention is mixed and mixed.
Manufactured using a stirrer. The mixing / stirring machine includes a solid mixer, a kneader, a stirrer and the like, and there are a continuous type and a batch type, and any of them may be used.

In order to manufacture the non-colored coated aggregate for pavement of the present invention, first, the non-colored aggregate is put into a mixer / stirrer, stirred for about 5 to 6 seconds, and then a predetermined amount of the binder is added. The first mixing and stirring are performed. It is a matter of course that the non-colored aggregate and the binder may be almost simultaneously introduced into the mixing / stirring machine to perform mixing / stirring. After confirming that the aggregate and the binder have been sufficiently mixed and that the coating layer of the binder has been formed on the surface of the aggregate, a predetermined amount of the powdered material is added, and the second mixing and stirring are performed. do. By this second mixing / stirring, a coating layer of the powdery material is constructed on the coating layer of the binder. The powdery material is adhered to the aggregate via the binder, and the non-colored coated aggregate for paving of the present invention is manufactured. The first mixing / stirring time and the second mixing / stirring time depend on the type and size of the mixing / stirring machine used, the amount of each material used, and the like, but each is approximately 20 to 120 seconds. .
The mixing / stirring temperature depends on the type of the binder used, but when the binder is an asphalt emulsion, a modified asphalt emulsion, an artificial asphalt emulsion, a modified artificial asphalt emulsion, a resin, a paint, an adhesive, etc. Is at room temperature,
In the case of cut-back asphalt or tar for pavement, etc., it is heated at about 100 ° C., and in the case of other natural asphalt, petroleum asphalt, artificial asphalt, etc., about 100-200 ° C., preferably about 120-200 ° C.
Mixing and agitation are performed while heating to ℃.

The amount of the binder used is preferably in the range of 0.1 to 3 parts by weight, particularly preferably 0.4 to 1.5 parts by weight, based on 100 parts by weight of the aggregate.
0.4-1 part by weight is even more preferred. The amount of binder is 0.1
If the amount is less than the weight part, the amount of the binder to the aggregate is too small,
Effective coating may not be possible. Conversely, if the amount exceeds 3 parts by weight, the amount of the binder to the aggregate is too large, and the bonding force between the aggregate and the road surface or between the aggregates decreases, Adhesion of the binder to the rollers and vehicle tires can be seen.

Further, the amount of the powdered and granular material used is
The range is preferably from 0.5 to 15 parts by weight, more preferably from 1.0 to 5 parts by weight, based on parts by weight. If the amount of the particulate material is less than 0.5 parts by weight, the amount of the particulate material with respect to the aggregate may be too small, and effective coating may not be performed. If the amount of the aggregate is too large, the bonding strength between the aggregate and the road surface or between the aggregates decreases, and there is a disadvantage that smoke is generated when handling the aggregate.
In the non-colored coated pavement aggregate for paving according to the present invention, as described later, it is desirable that the amount of the particulate material is larger than the amount of the binder in the weight part.

In addition to the above-described manufacturing method, the aggregate, the binder, and the powder / granular material may be simultaneously mixed and stirred, or the binder and the powder / granular material may be mixed in advance. It is also possible to produce the non-colored coated aggregate for pavement of the present invention by stirring and mixing this with the aggregate.

Hereinafter, the present invention will be described more specifically with reference to experimental examples.

<Experiment 1> Adhesion test In order to examine the effect of the mixing ratio of the binder and the powdered granule used for coating the aggregate on the durability of the sprayed surface treatment layer to be constructed, the following is described. The adhesion test was performed according to the Vialit adhesion test method.

That is, as the aggregate, a single-grain crushed stone aggregate having a particle size of 8-5 mm (produced by Kuzu, Tochigi Prefecture), as the binder, modified asphalt (trade name “Toughphalt Super”, manufactured by Nichireki Co., Ltd.), powder Portland cement (Sumitomo Osaka Cement Co., Ltd.) was used as the granules, and the mixing ratio of the binder and the granules was varied to produce non-colored coated aggregate samples. Manufacturing is to mix the aggregate and the binder, build a coating layer of the binder on the surface of the aggregate, add the powder and granule material, continue mixing, and coat the powder and granule material on the coating layer of the binder. The procedure for building layers was performed. The mixing was performed manually and the temperature during mixing was about 180 ° C. In the case where the binder or the granular material was not used, only the aggregate, or only the aggregate and the binder were mixed for the same time as that for the production of the other non-colored coated aggregate samples. Ninety coated non-colored coated aggregate samples thus prepared were prepared for each mixing ratio of the binder and the granular material, and dried and allowed to stand under the conditions specified in the Viarit adhesion test method.

On the other hand, a thickness of 2 mm and a size of 200 × 200
mm of metal plate was prepared for the number of non-colored coated aggregate samples, and 0.6 liter of asphalt emulsion (trade name "Sampisol", manufactured by Nichireki Co., Ltd.) was added thereto as a binder for the spray-type surface treatment method. / M ^2, and after spraying various colored coated aggregate samples from above, a linear pressure of 0.
A load of 75 kgf / cm was applied, and a total of 30 rotation pressures were applied 15 times in opposite directions. The temperature of the non-colored coated aggregate sample at the time of spraying was about 180 ° C. After leaving this to stand for 60 minutes, while holding the aggregate horizontally with the attached surface of the aggregate down, a diameter of 50 mm and a weight of 50
A 0 g iron ball was dropped onto the center of the metal plate three times within 10 seconds. The number of aggregate grains that have fallen off the metal plate due to the fall of the iron ball is counted as a, and the adhesion rate (%) is expressed as the adhesion rate (%) =
Calculated as {(90−a) / 90} × 100. Each non-colored coated aggregate sample was tested three times, and the results were averaged, and those with an adhesion rate of 90% or more were evaluated as satisfactory. The results are shown in Table 2 together with the mixing ratio. The parts by weight of the binder and the granular material are based on 100 parts by weight of the aggregate.

<Experiment 2> Adhesion test on paper surface The effect of the mixing ratio of the binder and the granular material used for coating the aggregate on the adhesion of the non-colored coated aggregate to the compaction roller and the vehicle tire was examined. In order to investigate, the following paper surface adhesion test was performed. That is, in the same procedure as in Experiment 1, various non-colored coated aggregate samples were sprayed on a metal plate and rolled. Then, the surface was covered with glossy high-quality paper, and the surface was covered with a hand roller in the opposite direction.
After 0 times, a total of 60 rotations were pressed. After rolling, the glossy high-quality paper was gently peeled off, and the number of aggregates adhered to the glossy high-quality paper was counted as b. The adhesion rate (%) was the adhesion rate (%) = ｛(90-
b) Calculated as / 90 ° × 100. The test was performed three times for each non-colored coated aggregate sample, and the results were averaged, and those having an adhesion rate of 8% or less were evaluated as satisfactory. The results are shown in Table 2.

<Experiment 3> One liter of the same non-colored coated aggregate sample produced in Experiment 1 was weighed, and each was transferred to a metal bat. Then, the non-colored coated aggregate sample was dropped on the floor. It was visually observed whether or not smoke was raised from the dropped non-colored coated aggregate sample, and it was determined that the amount of the powder and granules was excessive when the smoke was generated. In addition, even if the metal bat was tilted up to 60 degrees, it did not fall, and the presence or absence of non-colored coated aggregate solidified in aggregates was visually observed. It was determined that the amount of the binder was excessive compared to the amount of the granular material. Table 2 also shows the presence or absence of smoke and the occurrence of caking.

[0062]

[Table 2]

In the results of Table 2, the judgment was that the four items, ie, the ratio of adherence to Vialit, the ratio of adherence to the paper surface, the presence or absence of caking, and the presence or absence of powder smoke, were all satisfactory. “○”, “も の” indicates that only one item was unsatisfactory, and “×” indicates that two or more items were unsatisfactory.

As is evident from the results in Table 2, when both the binder and the granular material were used to form the coating layer of the granular material on the aggregate, the amount of the granular material used was moderate. In the case where the ratio is within the above range, the results show that the adherence rate of the vialit increases and the adhesion rate on the paper surface decreases as compared with the case where the powdery material is not used. This means that the non-colored coated aggregate of the present invention can construct a more durable surface treatment layer as compared with conventional aggregates, and has less adhesion to compaction rollers and vehicle tires. Indicates that traffic can be opened to the public. Also, the overall trend is that, when the amount of binder is fixed, there is an optimal range for the amount of powder and granular material, and when the amount of powder and granular material is smaller than that, It can be seen that consolidation is seen as it rises. On the other hand, when the amount of the powdered material is larger than the optimum range, the paper surface adhesion rate is low and no consolidation is observed, but the vialit adhesion rate is reduced and the generation of powder smoke is observed. Became. Similarly, as is clear from the results in Table 2, when the amount of the binder is 0.4 parts by weight to 1 part by weight, by setting the amount of the powdered material in an appropriate range, the adhesion rate of the bialite and the adhesion to the paper surface are determined. Particularly good results were obtained in terms of rate.

Hereinafter, the present invention will be described in detail with reference to examples, but it is needless to say that the present invention is not limited to these examples.

Example 1 A non-colored coated aggregate for pavement of the present invention was produced using the same materials as used in Experiment 1.
First, 100 parts by weight of the aggregate is put into a mixer, and after preliminarily stirring for about 5 seconds, 0.8 part by weight of a binder is put in and mixed for 30 seconds. The mixture was further added and mixed for 40 seconds to produce a non-colored coated aggregate for pavement of the present invention having a coating layer of a granular material. The mixing temperature was about 180 ° C.

Using the obtained non-colored coated aggregate for pavement,
A surface treatment layer was constructed on a test road surface in a factory by a spray-type surface treatment method comprising the following procedure. That is, first, after cleaning the test road surface, asphalt emulsion (trade name “Sampizol”, manufactured by Nichireki Co., Ltd.) was sprayed at 0.6 liter / m ^2, and then the above was sprayed from above. The non-colored coated aggregate for pavement was sprayed almost in a single layer. After spraying, the surface of the aggregate was rolled with a road roller, but no adhesion of the aggregate was found on the roller surface. After curing for 60 minutes, the vehicle was passed through an ordinary passenger car, but no adhesion of the aggregate to the tire surface and no dissipation of the aggregate from the constructed surface treatment layer was observed.

Example 2 Using straight asphalt (manufactured by Nippon Oil Co., Ltd.) as a binder and jet cement (manufactured by Sumitomo Osaka Cement Co., Ltd.) as a powder material,
The non-colored coated aggregate for pavement of the present invention was produced in the same manner as in Example 1 except that 0.6 parts by weight of the binder and 2.5 parts by weight of the granular material were used per 100 parts by weight of the aggregate. Further, a surface treatment layer was constructed in the same manner as in Example 1 using the non-colored coated aggregate for pavement. After the application of the aggregate, the surface of the aggregate was rolled with a road roller, but no adhesion of the aggregate was found on the roller surface. After curing for 60 minutes, the vehicle was passed through an ordinary passenger car, but no adhesion of the aggregate to the tire surface and no dissipation of the aggregate from the constructed surface treatment layer was observed.

<Example 3> Asphalt emulsion (trade name "Surfacesol", manufactured by Nichireki Co., Ltd.) was used as a binder, and the binder was added to 100 parts by weight of the aggregate.
0 parts by weight, using 4.5 parts by weight of powder and granules, mixed at room temperature
Except for stirring, a non-colored coated aggregate for pavement of the present invention was produced in the same manner as in Example 1. Using the obtained non-colored coated pavement aggregate for pavement, a spray-type surface treatment method was performed in the same manner as in Example 1, and after the aggregate was sprayed, the aggregate surface was rolled with a road roller. No adhesion of aggregate was observed. After curing for 60 minutes, the vehicle was passed through an ordinary passenger car, but no adhesion of the aggregate to the tire surface and no dissipation of the aggregate from the constructed surface treatment layer was observed.

<Example 4> Stone powder (particle size: 0.
75 mm or less, produced in Tochigi prefecture Kuzu), using the same method as in Example 3 except that 0.4 parts by weight of the binder and 1.5 parts by weight of the granular material were used with respect to 100 parts by weight of the aggregate. A non-colored coated aggregate for pavement of the present invention was produced. Using the obtained non-colored coated pavement aggregate for pavement, a spray-type surface treatment method was performed in the same manner as in Example 1, and after the aggregate was sprayed, the aggregate surface was rolled with a road roller. No adhesion of aggregate was observed. After curing for 60 minutes, the vehicle was passed through an ordinary passenger car, but no adhesion of the aggregate to the tire surface and no dissipation of the aggregate from the constructed surface treatment layer was observed.

[0071]

As described above, the non-colored coated aggregate for pavement of the present invention does not adhere to the compaction roller or the vehicle tire and has excellent bonding strength between the road surface and the aggregate. Therefore, not only can traffic be opened early after construction, but also a durable pavement can be constructed. In particular, when the non-colored coated aggregate for pavement of the present invention is used for the spray-type surface treatment method, it is possible to easily construct a highly durable surface treatment layer by a simple operation. It is extremely useful and excellent not only for repairing the body, but also when constructing a new pavement. Further, according to the method for producing a non-colored coated aggregate for pavement of the present invention, it is possible to obtain a non-colored coated aggregate for pavement having various excellent characteristics as described above, and it is possible to obtain a new technology in the technical field. It brings the nature.

Claims (13)

[Claims] 1. A non-colored coated aggregate for pavement, comprising a non-colored aggregate having a coating layer of a granular material attached via a binder. 2. The non-colored coated pavement aggregate according to claim 1, wherein the binder forms a coating layer covering the surface of the aggregate, and the granule further forms an outer coating layer. 3. The non-colored coated aggregate for pavement according to claim 1, wherein the powdery or granular material is a hydraulic inorganic material. 4. The non-colored aggregate is coated with 0.1 to 3 parts by weight of a binder and 0.5 to 15 parts by weight of a powdered material with respect to 100 parts by weight of the aggregate. The non-colored coated aggregate for pavement according to claim 1, 2 or 3. 5. The non-colored coating for pavement according to claim 1, wherein the non-colored aggregate is coated with a binder and a powdery material which is larger in weight part than the binder. aggregate. 6. The non-colored coated aggregate for pavement according to claim 1, which is an aggregate for a spraying type surface treatment method. 7. When the non-colored aggregate has a minimum particle size of less than 10 mm in the nominal size of the sieve opening, the difference between the minimum particle size and the maximum particle size is the nominal size of the sieve opening. 2m in dimensions
m or more and less than 5 mm, and when the minimum particle size is 10 mm or more in the nominal size of the sieve opening, the difference between the minimum particle size and the maximum particle size is 3 mm or more in the nominal size of the sieve opening.
The non-colored coated aggregate for pavement according to claim 6, which is an aggregate having a single grain size of not more than mm. 8. A process for mixing the non-colored aggregate and the binder to form a coating layer of the binder on the surface of the aggregate, and then adding and mixing the powder and granule to further coat the binder. Constructing a coating layer of a granular material on the layer, comprising the steps of: 9. The method for producing a non-colored coated aggregate for pavement according to claim 8, wherein the powdery or granular material is a hydraulic inorganic material. 10. An amount of 0.1 to 100 parts by weight of the aggregate.
The method according to claim 8 or 9, wherein 3 parts by weight of a binder and 0.5 to 15 parts by weight of a granular material are used. 11. The method for producing a non-colored coated aggregate for pavement according to claim 8, 9 or 10, wherein the weight ratio of the granular material used is larger than that of the binder. 12. The method for producing a non-colored coated pavement aggregate according to claim 8, wherein the aggregate to be produced is an aggregate for a spray-type surface treatment method. 13. When the non-colored aggregate has a minimum size of less than 10 mm in the minimum size of the sieve, the difference between the minimum particle size and the maximum size is the nominal size of the sieve. 2 in dimensions
mm or more and less than 5 mm, and when the minimum particle size is 10 mm or more in the nominal size of the sieve opening, the difference between the minimum particle size and the maximum particle size is more than 3 mm in the nominal size of the sieve opening,
The method for producing a non-colored coated aggregate for pavement according to claim 12, which is an aggregate having a single grain size of 6 mm or less.