JPH1112016A - Normal temperature asphalt mixture for paving having high solidifying speed and excellent miscibility and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the agglomeration phenomenon, increase the solidification speed and improve the miscibility by using aggregate, an asphalt emulsion, a hydraulic inorganic material and a foaming agent as main components and mixing the aggregate with the asphalt emulsion containing the above components in a state having the volume increased by foaming. SOLUTION: The asphalt emulsion is produced by emulsifying a bituminous material consisting of a mixture of one or more components selected from natural asphalt such as lake asphalt, petroleum asphalt such as straight asphalt, heavy oil, tar, etc., in water using an emulsifier such as a surfactant or a clay. The amount of the asphalt emulsion is 2-25 pts.wt. based on 100 pts.wt. of aggregate. The hydraulic inorganic material is e.g. cement, anhydrous gypsum, hemihydrate gypsum or powdery slag and is preferably a cement such as ordinary Portland cement. The amount of the hydraulic inorganic material is 1-20 pts.wt. based on 1.00 pts.wt. of the aggregate. The foaming agent is composed of one or more materials such as aluminum powder and magnesium powder and is used in an amount of 0.01-5 pts.wt. based on 1.00 pts.wt. of the cement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a room temperature asphalt mixture for pavement having a high solidification rate and excellent mixing properties, which is used for pavement of general roads, campus roads, walking paths in parks, bicycle paths, playgrounds, parking lots and the like. More specifically, the asphalt emulsion mortar containing an asphalt emulsion, a hydraulic inorganic material, and a foaming agent is mixed with an aggregate in a state where the volume is increased by bubbling, thereby improving the properties of the mortar. The present invention relates to a pavement room temperature asphalt mixture having a high speed and excellent mixing properties, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, cutback asphalt and asphalt emulsion have been used as binders for aggregates in ordinary temperature mixtures for paving. However, since the room temperature mixture for pavement using these binders requires a considerable curing time before it is solidified, if a vehicle or the like is passed immediately after paving, deformation of the pavement surface occurs, and early traffic release is not possible. There was a drawback.

In order to avoid this difficulty, attempts have been made to add a hydraulic inorganic material such as cement to these room temperature mixtures for paving. For example, in the on-road mixing method performed at room temperature, when producing a room temperature mixture for pavement using asphalt emulsion as a binder, a hydraulic inorganic material is added to accelerate the solidification time of the room temperature mixture and to provide early strength. After paving, traffic is released immediately.

However, in such a room temperature mixture, an asphalt emulsion mortar obtained by mixing an asphalt emulsion and a hydraulic inorganic material plays a role as a binder for connecting the aggregates. In order to sufficiently fulfill the role as a binder, it is necessary that the aggregate and the asphalt emulsion mortar are uniformly mixed, in other words, the surface of the aggregate is uniformly covered with the asphalt emulsion mortar. is there.

However, when the aggregate used has a large number of fine particles having a large specific surface area, even if the asphalt emulsion mortar and the aggregate are to be mixed uniformly, the asphalt emulsion mortar or the asphalt constituting the asphalt emulsion mortar may become fine particles. The so-called agglomeration phenomenon, in which fine aggregates are absorbed first and the fine-grain aggregates solidify in blocks, is conspicuous, and as a result, the asphalt emulsion mortar adheres to the aggregate having a relatively large particle size. There was a drawback that the mixture was inhibited and a good room temperature asphalt mixture could not be obtained.
That is, if the surface of the aggregate is not sufficiently covered with the asphalt emulsion mortar, the solidified room temperature asphalt mixture is
As a result, the pavement is inferior in abrasion resistance, exfoliation resistance, and water resistance.

[0006] In order to eliminate this drawback, attempts have been made to increase the mixing time to achieve uniform and good mixing of the asphalt emulsion mortar and the aggregate. However, if the mixing time is lengthened, the efficiency becomes worse. If the length is too long, the asphalt emulsion mortar once adhered to the aggregate is peeled off, and there is a problem that it is difficult to uniformly mix the aggregate and the asphalt emulsion mortar.

[0007] Therefore, even when an aggregate containing fine particles is used, the aggregate and the asphalt emulsion mortar can be uniformly and satisfactorily mixed in a short time, and the surface of the aggregate has an asphalt emulsion mortar. A room temperature asphalt mixture for pavement, which is uniformly coated with water, has excellent properties such as water resistance, abrasion resistance, and peeling resistance, has a high solidification rate, and has excellent mixing properties, is desired.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks of the prior art. Even if the aggregate contains fine particles, the aggregate and the asphalt emulsion It is an object of the present invention to provide a room temperature asphalt mixture for pavement, in which mortar is uniformly mixed, has a high solidification rate and is excellent in mixability, and a method for producing the same.

[0009]

Means for Solving the Problems The inventors of the present invention have repeatedly studied the mixing properties of asphalt emulsion mortar and aggregates, particularly aggregates containing fine particles, and as a result, the volume of asphalt emulsion mortar was reduced by foaming. The inventors have found that by increasing the amount, the mixing with the aggregate becomes uniform, and the agglomeration phenomenon in which the aggregates solidify together is remarkably suppressed, and the present invention has been completed.

That is, the present invention provides an asphalt emulsion mortar comprising an aggregate, an asphalt emulsion, a hydraulic inorganic material, and a foaming agent as main components, wherein the aggregate comprises an asphalt emulsion, a hydraulic inorganic material, and a foaming agent. In the state where the volume of the asphalt emulsion mortar is increased by bubbling, they are mixed with each other, and a pavement room-temperature asphalt mixture having a high solidification rate and a high mixing property, in which the aggregation of aggregates is suppressed from being reduced, and A state in which the volume of asphalt emulsion mortar is increased by bubbling when producing an asphalt normal temperature asphalt mixture for pavement having a high solidification rate and excellent mixing properties containing an aggregate, an asphalt emulsion, a hydraulic inorganic material, and a foaming agent as main components. Room temperature asphalt for pavement with high solidification rate and excellent mixability, including the step of mixing aggregate and asphalt emulsion mortar By providing a method for producing a preparative mixture, which is to solve the above problems.

According to the knowledge of the present inventors, asphalt emulsion mortar in a state where the volume has been increased by foaming is as follows:
Even if the aggregate used contains a large amount of fine particles having a large specific surface area, it is possible to cover the surface of the fine particle aggregate almost completely, and asphalt A uniform coating film of the emulsion mortar is formed to prevent aggregates from agglomerating. In addition, the room-temperature asphalt mixture thus obtained not only has a high solidification rate, but also has good physical properties even after solidification as a result of the aggregate surface being effectively covered with the asphalt emulsion mortar. A room-temperature asphalt mixture having low, high marshalling stability, and improved peeling resistance and abrasion resistance can be obtained.

The asphalt emulsion mortar used in the present invention is preferably foamed with a blowing agent. It is preferable that the bubbles in the asphalt emulsion mortar have excellent stability, and the bubbles are finely dispersed and stable with little aggregation over time.

[0013] The asphalt emulsion mortar used in the present invention foams by adding a foaming agent, and its volume increases. There is no particular limitation on the amount of increase in volume, but usually,
2-3 of volume of original asphalt emulsion and hydraulic inorganic material
About 0 times is preferable. If the amount of increase in volume is less than twice, the effect of uniform mixing due to the increase in volume cannot be sufficiently expected. Conversely, even if the volume is increased more than 30 times, there is no significant difference in the effect of uniform mixing. . Usually 3 volumes of the volume before foaming
About 15 times is preferable.

In the production of foamed asphalt emulsion mortar, the asphalt emulsion, the hydraulic inorganic material and the blowing agent may be mixed and foamed, or the asphalt emulsion may be previously mechanically stirred or blown with air. After sufficiently foaming, the hydraulic inorganic material and the foaming agent may be foamed by mixing and stirring. When mixing and stirring the asphalt emulsion mortar, mechanical stirring for rotating a rotating body in the mixture, or physical stirring such as blowing air or the like into the mixture may be used.
Of course, both can be used in combination. Moreover, you may add a foaming agent, water, etc. separately.

The mixing of the aggregate and the asphalt emulsion mortar is performed in a state where the volume of the asphalt emulsion mortar is increased by foaming. The order of mixing the aggregate and the asphalt emulsion mortar is not particularly limited, and the fine aggregate having a relatively small particle size and the coarse aggregate having a relatively large particle size are mixed with each other in advance, and then the volume is increased. The asphalt emulsion mortar in the increased state may be mixed.After the coarse aggregate and the asphalt emulsion mortar in the increased volume are mixed, the fine aggregate and the asphalt emulsion mortar with the increased volume are added to the mixture. And may be further mixed. However, it is advantageous to mix both the fine aggregate and the asphalt emulsion mortar in an increased volume state and the coarse aggregate and the asphalt emulsion mortar in an increased volume state separately, and then mix both mixtures. It is most preferable from the viewpoint of the uniformity of the mixture obtained. Even if the aggregate used is only coarse aggregate that does not contain fine particles, the aggregate and the asphalt emulsion mortar can be further increased by using the asphalt emulsion mortar having an increased volume. It becomes possible to mix evenly,
The present invention naturally includes such a case.

The room temperature asphalt mixture for pavement of the present invention, which has a high solidification rate and is excellent in mixing properties, can be used on general roads, on-site roads, in parks, etc., on bicycle paths, athletic grounds and parking lots, regardless of repair work or new construction work. It is used for pavement of a car park, an airport, a port facility, and the like, and the place to be used includes any of the surface layer, the base layer, and the roadbed layer of the pavement.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The room temperature asphalt mixture for pavement of the present invention having a high solidification rate and excellent mixing properties and a method for producing the same will be described in detail below.

The asphalt emulsion used for the pavement room-temperature asphalt mixture having a high solidification rate and excellent mixing properties according to the present invention refers to natural asphalt such as lake asphalt, straight asphalt, blown asphalt, semi-blown asphalt, solvent deasphalted asphalt ( For example,
One kind of petroleum asphalt such as propane deasphalted asphalt), heavy oil, tar, pitch or the like, or a bituminous substance obtained by mixing two or more kinds thereof, using various surfactants or an emulsifier such as clay (for example, bentonite). Alkalis, acids,
Salts, dispersants, protective colloids, and the like are added as necessary, and emulsified in water by 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 usable in the present invention include aliphatic or alicyclic monoamines having long-chain alkyl groups, diamines, triamines, amidoamines.
Polyaminoethylimidazoline, long-chain hydroxyalkyldiamine, rosinamine, ethylene oxide adducts of these amines, amine oxides, or water-soluble compounds obtained by reacting these amine surfactants with acids such as hydrochloric acid, sulfamic acid, and acetic acid. Examples thereof include water-dispersible salts, 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 usable in the present invention include higher alcohol sulfates, alkyl allyl sulfonates, alkyl benzene sulfonates, α-olefin sulfonates, higher alcohol ethoxylates, higher alcohol ethoxylate sulfates, Soap, naphthalene sulfonate and modified formalin,
Examples thereof include alkali lignin salts, lignin sulfonates, alkali salts of casein, and polyacrylates.

Examples of the amphoteric emulsifier which can be used in the present invention include alkylphenols, mono- and polyhydric alcohol acids, adducts of alkylene oxides such as aliphatics, aliphatic amines, aliphatic amides and ethanolamines. Is mentioned.

The dispersing agents and protective colloids used in the asphalt emulsion of the present invention include sodium naphthalenesulfonate, casein, alginic acid, gelatin, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, sodium polyacrylate, ligninsulfone. And nitrohumates.

Any of the above three emulsifiers can be used as appropriate, but from the viewpoint of the water absorption after solidification, it is preferable to use an amphoteric emulsifier.

In the asphalt emulsion used in the present invention, natural rubber or various synthetic rubbers can be used alone or in combination with the above-mentioned emulsified and dispersed bitumen. As the synthetic rubber, various synthetic rubbers such as chloroprene rubber, styrene / isoprene copolymer rubber, polyisoprene rubber, polybutadiene rubber, and styrene / butadiene copolymer rubber are used alone or in combination. In particular, when chloroprene rubber or styrene-isoprene copolymer rubber is used, characteristics at high and low temperatures are improved, which is preferable. Also, Mooney viscosity is
A solid or latex type, about 10 to 100, is preferable because good results are obtained.

The asphalt emulsion used in the present invention also includes a modified asphalt obtained by adding the following polymer in addition to rubber to bitumen material, and emulsifying the modified asphalt to form an asphalt emulsion. That is, as a polymer to be added, a synthetic high-molecular polymer resin such as ethylene-vinyl acetate copolymer, polyethyl acrylate, polymethyl acrylate, polyacrylic acid, or polyvinyl chloride, a coumarone resin, a carbonate resin, a xylene resin, and urea formalin Resins, synthetic resins such as alkyd resins, and natural resins such as rosin and terpene resins.

To these asphalt emulsions, ultraviolet absorbers, various additives, viscosity modifiers, etc. are added for the purpose of improving heat resistance, preventing deterioration due to ultraviolet rays, improving workability, and improving adhesiveness. You may.

The solid content in the asphalt emulsion used in the present invention is preferably in the range of 40 to 80% by weight.
If the solid content is less than 40% by weight, this does not mean that it cannot be particularly used, but the room-temperature asphalt mixture layer tends to be slightly inferior in terms of adhesiveness and viscoelasticity, which is not preferable. On the other hand, if the solid content exceeds 80% by weight, it does not mean that the solid content cannot be particularly used, but the viscosity is increased and the workability tends to be slightly inferior.

In the case of an asphalt emulsion containing rubber or polymer, the amount of rubber or polymer solids is 5
The range of -20% by weight is preferred. If the solid content of the rubber or the polymer is less than 5% by weight, this does not mean that it cannot be particularly used, but the room-temperature asphalt mixture layer tends to be slightly inferior in terms of adhesiveness and viscoelasticity, which is not preferable. on the other hand,
If the solid content of the rubber or polymer exceeds 20% by weight, this does not mean that the rubber or polymer cannot be used, but the viscosity tends to increase and the workability tends to be slightly inferior.

The decomposition of the asphalt emulsion generally depends on spontaneous decomposition, but in some cases, it may be forcibly decomposed using a decomposition accelerator.

The amount of asphalt emulsion used for the pavement cold asphalt mixture of the present invention having a high solidification rate and excellent mixing properties is preferably in the range of 2 to 25 parts by weight of asphalt emulsion per 100 parts by weight of aggregate. More preferably,
It is in the range of 5 to 20 parts by weight. When the amount of the asphalt emulsion is less than 2 parts by weight, sufficient adhesiveness to be provided by asphalt cannot be obtained, and when the amount of the asphalt emulsion exceeds 25 parts by weight, the viscosity of the mixture increases, It is not preferable in terms of workability.

Examples of the hydraulic inorganic material used for the pavement room temperature asphalt mixture of the present invention, which has a high solidification rate and excellent mixing properties, include cement, anhydrous gypsum, hemihydrate gypsum, and powdery slag. Is preferred in terms of solidification rate and physical properties after solidification.

As the cement to be used, ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, medium heat Portland cement, blast furnace cement, silica cement, alumina cement, expanded cement, blast furnace colloid cement, colloid cement, ultra-fast hardening Cement, white cement, fly ash cement, sulfate resistant cement, jet cement and the like.

The amount of the hydraulic inorganic material used depends on the amount of the aggregate 10
It is in the range of 1 to 20 parts by weight, preferably 2 to 15 parts by weight, based on 0 parts by weight. When the amount of the hydraulic inorganic material is less than 1 part by weight, the strength of the mixture is not so much improved, and when it exceeds 20 parts by weight, the obtained strength does not show much improvement, and the mixture is simply expensive. Is not preferred.

The foaming agent used in the present invention is not particularly limited. Examples thereof include metal powders such as aluminum powder, magnesium powder and zinc powder, hydrogen peroxide and salad powder, hydrochloric acid and sodium bicarbonate, magnesium and lead and alkali, calcium Carbide and water, among which metal powders such as aluminum powder, magnesium powder, and zinc powder, and those obtained by subjecting these powders to surface treatment with an organic acid such as stearic acid.
Species or two or more are preferred.

The amount of the foaming agent used is 100
It is in the range of 0.01 to 5 parts by weight with respect to parts by weight. If the amount of the foaming agent is less than 0.01 part by weight, the foaming effect is small, and if it exceeds 5 parts by weight, the physical properties of the room temperature mixture after curing are adversely affected, which is not preferable.

The aggregate used in the present invention is an aggregate for pavement described in "Asphalt Pavement Outline" issued by the Japan Road Association, and is crushed stone, crushed stone, gravel, steel slag, and the like. Further, asphalt-coated aggregates obtained by coating these aggregates with asphalt, recycled aggregates, and the like can also be used. In addition, granular materials similar to this, artificially fired aggregates, fired expanded aggregates, artificial lightweight aggregates, ceramic particles, loxobite, Sinopearl, aluminum particles, plastic particles,
Ceramics, emery and the like can also be used.

These aggregates are roughly classified into coarse aggregates, fine aggregates, and fillers.
mm aggregate that has a particle size that stops at the screen.
Aggregate having a particle size that passes through a 2.5 mm screen and stops at a 0.074 mm screen. The filler is
Particles that pass through a 0.074 mm screen. The coarse aggregate used in the present invention generally means a particle size range of 2.
No. 7 crushed stone of 5-5 mm, No. 6 crushed stone of particle size range 5-13 mm, No. 5 crushed stone of particle size range 13-20 mm,
There are types such as No. 4 crushed stone having a particle size range of 20 to 30 mm, and crushed stones obtained by mixing one or two or more kinds thereof, and synthesized crushed stones are used. These aggregates are preferably coated with about 0.3 to 1% by weight of asphalt emulsion or straight asphalt based on the aggregate.

The fine aggregate used in the present invention includes, for example, river sand, hill sand, mountain sand, screenings, crushed dust, silica sand, artificial aggregate and the like.

The filler used in the present invention is, for example,
Screening filler, stone powder, incinerator ash, clay, talc, fly ash, carbon black, etc. In addition, rubber powder, cork powder, wood powder,
0.075m even for resin powder, pulp and artificial aggregate
If it passes through the m sieve, it can be used as a filler.

The distinction between the coarse aggregate, the fine aggregate, and the filler as described above is for the purpose of facilitating the understanding of the properties of the aggregate and the design of the particle size. If it can be obtained, use an aggregate having a continuous particle size in which any two or more of coarse aggregate, fine aggregate, and filler are mixed, for example, a crushed crushed stone, crusher run, cut crushed stone, scraped gravel, etc. It is also possible.

The room temperature asphalt mixture for pavement according to the present invention, which has a high solidification rate and excellent mixability, includes the following materials in addition to the above materials.
Glass powder, iron powder, metal powder, organic and / or inorganic coloring pigments, organic and / or inorganic fiber materials, and the like may be added. These additives may be added depending on the use of the pavement room-temperature asphalt mixture. It is appropriately selected. For example, a colored pigment is used when coloring a cured product of a room temperature asphalt mixture for pavement, and a fiber material is added to improve the strength of the cured product.

The following are examples of the color pigments used. Inorganic pigments White: titanium dioxide, zinc oxide, lead white Black: iron black, graphite, carbon black Red: cadmium red Orange: molybdenum orange Yellow: ferric hydroxide, iron oxide yellow , Yellow lead Green: chrome oxide, chrome green Blue: ultramarine, navy blue, cobalt blue Purple: manganese violet

Organic pigment Red: Watching red, quinacridone red Orange: Permanent orange Yellow: Fast yellow Green: Phthalocyanine green Blue: Phthalocyanine blue Purple: Dioxazine violet

These coloring pigments may be used alone or in combination of two or more. A typical amount of the pigment is 1 to 1 part by weight per 100 parts by weight of a room temperature asphalt mixture for pavement.
It is 2 parts by weight, but preferably 3 to 8 parts by weight. If the amount of the coloring pigment is less than 1 part by weight, a clear color cannot be obtained, and if it exceeds 12 parts by weight, there is not much difference in the effect, which is uneconomical.

Examples of the fiber material used include synthetic fibers such as polyester, polyamide, aromatic polyamide, polypropylene, vinylon, acryl, and polyvinylidene chloride, or semi-synthetic fibers, natural fibers, glass fibers, recycled fibers, and carbon fibers. Although various materials such as metal fibers and the like are used, among them, alkali-resistant glass fibers are preferable.

These fibers may be monofilaments, multifilaments obtained by bundling a large number of monofilaments, or spun yarns or twisted yarns. When used, short fibers cut to an appropriate length are used. Use as The length of the short fiber used is not particularly limited, but if it is too short, there is no effect on the strength maintenance and crack followability by the fiber.
mm to 35 mm are preferred.

The amount of the fiber material to be used is usually from 1 to 10 with respect to 100 parts by weight of the asphalt mixture for paving at room temperature.
It is in the range of parts by weight, preferably in the range of 2 to 5 parts by weight. If the amount of the fibrous material is less than 1 part by weight, no significant effect is obtained, and if it exceeds 10 parts by weight, the workability of the pavement room-temperature asphalt mixture deteriorates.

As the water used in the present invention, for example, fresh water such as tap water, industrial water, groundwater, river water, agricultural water and the like is usually used.

In the present invention, the asphalt emulsion comprises:
First, it is mixed with a hydraulic inorganic material and a foaming agent to form an asphalt emulsion mortar having an increased foaming volume, and then mixed with an aggregate.

In producing the asphalt emulsion mortar, the asphalt emulsion, the hydraulic inorganic material, and the foaming agent may be mixed in a mixer such as a mixer at the same time. First, the asphalt emulsion and the hydraulic inorganic material may be mixed with each other. After mixing, a foaming agent may be added. However, from the viewpoint of sufficiently foaming and improving the mixing property, the asphalt emulsion is sufficiently foamed in advance with a stirrer or the like, and the hydraulic inorganic material and the foaming agent are mixed therewith or mixed with water. It is preferable that the hard inorganic material and the foaming agent are sufficiently mixed in advance, and then separately mixed with a sufficiently foamed asphalt emulsion.

For mixing, commonly used mixers such as a mortar mixer, a pug mill mixer and a continuous mixer are used.

In producing the asphalt emulsion mortar of the present invention, water, a water reducing agent, a quench hardener,
And an admixture such as a setting modifier, further, a foaming agent,
In some cases, a filler or fine aggregate can be added.

As the water reducing agent, commercially available naphthalene-based, melamine-based, lignin-based and carboxylic acid-based water-reducing agents can be used, but naphthalene-based water-reducing agents such as naphthalene sulfonate are preferred.

As the hardening agent, a mixture of calcium aluminate and anhydrous gypsum or a mixture of calcium aluminate, sodium aluminate and anhydrous gypsum can be used.

As the setting modifier, inorganic salts, organic acids and organic acid salts may be used alone or in combination. Examples of inorganic salts include CaCl ₂ , ZnC
l ₂ , chlorides such as FeCl ₂ , K ₂ CO ₃ , Na ₂ CO ₃ ,
Carbonates and borides such as CaB ₄ O ₇ and Na ₂ B ₄ O ₇ can be used. As the organic acid, citric acid, gluconic acid, tartaric acid and the like can be used, and as the organic acid salts, sodium citrate, calcium citrate, sodium gluconate, calcium gluconate and the like can be used.

As the foaming agent, for example, synthetic surfactants such as resin soaps, alkylsulfonic acids, protein derivatives such as casein and gelatin, and high molecular surfactants such as maleic acid can be used. The range is preferably 0.001 to 0.125 parts by weight with respect to 100 parts by weight of the aggregate. When the amount of the foaming agent is less than 0.001 part by weight, the effect of foaming the asphalt emulsion mortar is not so large. On the other hand, when the amount exceeds 0.125 part by weight, the viscosity of the foamed asphalt emulsion mortar becomes large, and the workability is deteriorated. In addition to chipping, the cure speed of the mixture is reduced.

The asphalt emulsion mortar of the present invention foams due to the presence of the foaming agent and the hydraulic inorganic material or the foamed asphalt emulsion, and its volume increases. However, when the volume increase is not sufficient with the foaming agent alone, stirring is performed. Mechanical stirring means for rotating or vibrating the wings and the like, and physical stirring means for forcibly blowing air or the like may be used together.

It is preferable to use a foaming accelerator, a foam dispersant, a foam stabilizer and the like in combination, since a more favorable asphalt emulsion mortar can be obtained.

The process for producing a cold asphalt mixture for pavement according to the present invention, which has a high solidification rate and excellent mixing properties, comprises mixing the asphalt emulsion mortar with the aggregate in a state where the volume of the asphalt emulsion mortar is increased by foaming. It is only necessary that the volume of the asphalt emulsion mortar is increased at the time of mixing.
The order of mixing is not particularly limited, but for example, it can be produced by the following procedure.

The coarse aggregate and the asphalt emulsion mortar whose volume has been increased by bubbling are mixed, and separately, the fine aggregate and the asphalt emulsion mortar whose volume has been increased by bubbling are mixed separately. After thorough mixing, the two mixtures are combined and mixed more thoroughly. At this time, as a mixer for mixing the two mixtures together, a mixer different from a mixer in which coarse aggregate and asphalt emulsion mortar are mixed and a mixer in which fine aggregate and asphalt emulsion mortar are mixed may be used. Alternatively, a mixer in which coarse aggregate and asphalt emulsion mortar are mixed may be used by adding a mixture of fine aggregate and asphalt emulsion mortar to a mixer in which coarse aggregate and asphalt emulsion mortar are mixed. Conversely, a mixer in which fine aggregate and asphalt emulsion mortar are mixed may be used by adding a mixture of coarse aggregate and asphalt emulsion mortar to a mixer in which fine aggregate and asphalt emulsion mortar are mixed.

Alternatively, when there is only one mixer, the asphalt emulsion mortar may be first foamed in the mixer, and then the coarse aggregate and the fine aggregate may be charged into the same mixer and mixed. .

The asphalt emulsion mortar and each aggregate may be mixed by putting the whole amount to be mixed into the mixer at one time, or may be put in plural times and mixed.

Further, after the coarse aggregate and the fine aggregate are sufficiently mixed in advance, the asphalt emulsion mortar having an increased volume may be added at once or dividedly and mixed.

The asphalt emulsion mortar usually depends on the ratio of the coarse aggregate and the fine aggregate to be used.
３ to ／ are used for mixing with coarse aggregate, and the remaining ／
It is preferred to use ~ 2/4 for mixing with fine aggregate.

When a filler is used, it may be mixed with the fine aggregate in advance, or may be put into a mixer together with the fine aggregate to be mixed.

In the case of adding a coloring pigment, a fiber material, and a hydraulic inorganic material, it is preferable to add them at a stage where the coarse and fine aggregates and the asphalt emulsion mortar are sufficiently mixed. Further, the above-mentioned admixtures such as a water reducing agent, a hardening agent, and a setting modifier may be added when mixing the asphalt emulsion mortar and the aggregate.

When coarse aggregate is not used, it is needless to say that only fine aggregate may be mixed with the asphalt emulsion mortar in a state where the volume is increased.

The mixer to be used is not particularly limited. For example, a continuous mixer, a pug mill mixer, a pan mixer, a tiltable mixer, a mortar mixer, or the like is used.

The production of the room temperature asphalt mixture for pavement of the present invention can be easily carried out both at a plant and at an execution site.

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

[0072]

Example 1 The amount of asphalt emulsion was 8.0 parts by weight and the amount of hydraulic inorganic material was 3.0 parts by weight per 100 parts by weight of aggregate.
By using 0.1 parts by weight of a foaming agent and 0.15 parts by weight of a foaming agent, and using an appropriate amount of water, a room temperature asphalt mixture for pavement of the present invention having a high solidification rate and excellent mixing properties was produced.

The materials used are as follows. Asphalt emulsion: Assol A (Nichireki Co., Ltd.) Evaporation residue 59.0% Hydraulic inorganic material: Ordinary Portland cement (Chichibu Onoda Co., Ltd.) Aggregate: Cut crushed stone (Awano, Tochigi Prefecture) 20% by weight No. 6 crushed stone (from Awano, Tochigi prefecture) 20% by weight No. 7 crushed stone (from Awano, Tochigi prefecture) 10% by weight Screening's (from Awano, Tochigi prefecture) 30% by weight Recycled aggregate 20% by weight of mixed aggregate. However, as the recycled aggregate, a cutting mixture of an existing pavement on Tochigi Prefectural Road was used. The particle size distribution of the aggregate used is as shown in Table 1.

[0074]

[Table 1]

Blowing agent: Aluminum powder C-250 (Nakajima Metal Foil Powder Co., Ltd.)
Water): Suitable amount of tap water

Using the above-mentioned materials, a normal temperature asphalt mixture for pavement of the present invention having a high solidification rate and excellent mixing properties was produced by the following procedure.

First, a mixer (punt mixer, pant mixer,
IWATANI IMX610) and mix until it is about 5 times the original volume of the asphalt emulsion mortar,
A foam asphalt emulsion mortar was produced. Subsequently, the synthetic aggregate of each of the above aggregates was charged into a pug mill mixer, and after sufficient mixing, the above asphalt emulsion mortar was charged. In about 90 seconds, the solidification rate of the present invention was high and the mixability was excellent. A room temperature asphalt mixture for paving was obtained.

Next, a normal temperature asphalt mixture for pavement as a control was produced in the same manner as described above except that no foaming agent was added. There was no foaming of the asphalt emulsion mortar and no increase in volume was observed.

Using the above two kinds of normal-temperature asphalt mixtures, “Pavement Test Method Handbook” edited by The Japan Road Association (4th edition, published on April 20, 1992, Maruzen Co., Ltd., 506)
Specimens were prepared in accordance with the Marshall stability test method of (-511), and the water absorption and the ratio between the water immersion strength and the non-water immersion strength were measured. However, curing condition is 20 ° C air curing 7
Day + 20 ℃ water curing 1 day + 60 ℃ air curing 2 days + 30 ℃
30 minutes in water curing (hereinafter referred to as non-water immersion conditions) at 20 ° C
Curing in air 7 days + Curing in water at 20 ° C 1 day + Curing in water at 60 ° C 2
Day + 30 ° C water curing 30 minutes (hereinafter referred to as water immersion condition). The water absorption rate is 20% under each curing condition.
The weight of the specimen immediately after curing in air at 7 ° C. was defined as A, and the weight of the specimen immediately after curing in water at 20 ° C. as B was calculated using the following formula.

[0080]

(Equation 1)

The ratio between the water immersion strength and the non-water immersion strength was determined by performing a Marshall uniaxial compression test of the test specimen after curing.

The results are as shown in Table 2.

[0083]

[Table 2]

As is clear from the results in Table 2, the room temperature asphalt mixture for pavement of the present invention using the asphalt emulsion mortar whose volume has been increased by foaming uses a conventional foamless asphalt emulsion mortar in terms of water absorption. Better than cold asphalt mixtures for paving.

The room temperature asphalt mixture for pavement of the present invention is also superior to the conventional room temperature asphalt mixture for pavement using a non-foaming asphalt emulsion mortar in the ratio between the water immersion strength and the non-water immersion strength. These results show that in the room temperature asphalt mixture for paving of the present invention, the aggregate in the mixture is uniformly mixed and covered with the asphalt emulsion mortar, and has excellent water resistance.

The specimen was cut with a cutter and the cross section was inspected. As a result, in the control specimen, it was found that the aggregate of fine particles was solidified and aggregated together with the asphalt emulsion. However, no aggregated portion of such aggregate was observed in the specimen of the present invention.

[0087]

Example 2 A normal temperature asphalt mixture for paving of the present invention was produced in the same manner as in Example 1 except that the following aggregates were used. However, during the production of the asphalt emulsion mortar, the mixing time is changed so that the asphalt emulsion mortar increases the volume of the asphalt emulsion mortar twice, three times, and five times as much as the original asphalt emulsion mortar. Using the asphalt emulsion mortars prepared, three types of pavement cold asphalt mixtures were obtained. In addition, asphalt mixture for pavement was prepared using asphalt emulsion mortar having no volume increase due to foaming in the same manner except that no foaming agent was added, and used as a control. Specimens were prepared from each of the manufactured mixtures and subjected to a cantabulo test. The aggregate used and the test method are as follows.

Aggregate: Masato (from Higashihiroshima City, Hiroshima Prefecture) The properties are as shown in Table 3.

[0089]

[Table 3]

Cantablo test: edited by The Japan Road Association, “Pavement Test Method Handbook Separate Volume (Provisional Test Method)” (1996)
Published October 20, 2012, Maruzen Co., Ltd., pp. 7-13). However, curing conditions are as follows: 20 ° C, 6 days after air curing, 5 ° C.
Air curing was one day, the test temperature was 5 ° C., and the test times were four types of 1, 3, 5, and 10 minutes, respectively. The weight of the specimen before the test was C and the weight of the specimen after the test was D, and the loss rate was calculated using the following equation.

[0091]

(Equation 2)

The results are shown in Table 4.

[0093]

[Table 4]

As can be seen from the results shown in Table 4, the loss rate of cantablos decreases as the volume of the asphalt emulsion mortar is increased, and the bonding strength between aggregates is reduced according to the cold asphalt mixture for pavement of the present invention. It can be seen that is superior to the conventional one (the one with a volume increase of one time). Thus, the increase in the volume of the asphalt emulsion mortar due to foaming is effective for uniform coating of the aggregate.

[0095]

Example 3 Using the same materials as in Example 2, the asphalt emulsion mortar whose volume increase due to bubbling of the asphalt emulsion mortar was 2, 3, 4 or 5 times that of the original asphalt emulsion mortar. Along with the manufacture, a non-foaming asphalt emulsion mortar is separately manufactured, and how the time required for mixing the asphalt emulsion mortar and the aggregate between the foamed asphalt emulsion mortar and the non-foaming asphalt emulsion mortar changes. I checked what to do. The end of mixing was visually determined. Table 5 shows the results.

[0096]

[Table 5]

As is clear from the results in Table 5, the use of the foamed asphalt emulsion mortar shortens the mixing time with the aggregate, and the use of the foamed asphalt emulsion mortar is effective in improving the mixing property. It turns out that it is.

[0098]

As described above, the present invention uses an asphalt emulsion mortar whose volume has been increased by bubbling, so that the aggregate surface can be uniformly and in a short time even if the aggregate has many fine particles. It is possible to coat and effectively suppress the aggregation of the aggregate, and as a result, the water absorption and the ratio between the water immersion strength and the non-water immersion strength, and furthermore, the water resistance shown by the Cantablo test And a mixture having excellent peel resistance and abrasion resistance. Moreover, the room-temperature asphalt mixture for pavement of the present invention containing a hydraulic inorganic material can be hardened in a short time after construction and can exhibit a predetermined strength, and is an industrially extremely useful invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C04B 24:26)

Claims (13)

[Claims] 1. An asphalt emulsion mortar comprising an asphalt emulsion, a hydraulic inorganic material and a foaming agent, wherein the main components are an aggregate, an asphalt emulsion, a hydraulic inorganic material and a foaming agent. A room temperature asphalt mixture for pavement having a high solidification rate and excellent mixing properties, wherein the mixture is mixed with each other in a state where the volume is increased by bubbling, and the aggregation of aggregates is suppressed from being reduced. 2. An aggregate comprising fine aggregate and coarse aggregate, wherein the fine aggregate and coarse aggregate are separately mixed with asphalt emulsion mortar whose volume has been increased by bubbling,
2. The room temperature asphalt mixture for pavement according to claim 1, wherein the mixture is mixed with each other, and the agglomeration phenomenon of aggregate including fine aggregate is suppressed. . 3. An asphalt emulsion comprising fine aggregate and coarse aggregate, wherein the coarse aggregate is mixed with an asphalt emulsion mortar whose volume has been increased by foaming, and thereafter the volume has been increased by fine aggregate and foaming. The mortar and the mortar are further mixed, and the agglomeration phenomenon of the aggregate including the fine aggregate is suppressed, and the solidification rate is high and the mixing property is excellent. Room temperature asphalt mixture for paving. 4. The room temperature asphalt mixture for pavement according to claim 1, wherein the fine aggregate and / or asphalt emulsion mortar further comprises a filler. 5. The method according to claim 1, wherein the foaming agent is one or more selected from aluminum powder, magnesium powder, and zinc powder. Room temperature asphalt mixture for pavement with excellent quality. 6. The room temperature asphalt mixture for pavement according to claim 1, further comprising a coloring pigment and / or a fiber material, wherein the mixture has a high solidification rate and is excellent in mixing properties. 7. An asphalt emulsion and a hydraulic inorganic material for producing a pavement room-temperature asphalt mixture having a high solidification rate and excellent mixing properties containing an aggregate, an asphalt emulsion, a hydraulic inorganic material, and a foaming agent as main components. Mixing the aggregate and the asphalt emulsion mortar in a state where the volume of the obtained asphalt emulsion mortar is increased by bubbling. Method for producing room temperature asphalt mixture for pavement having excellent resistance. 8. An aggregate comprising fine aggregate and coarse aggregate, wherein the fine aggregate and coarse aggregate are separately mixed with an asphalt emulsion mortar whose volume is increased by bubbling. 8. The method for producing a room temperature asphalt mixture for pavement according to claim 7, wherein the mixture is mixed with each other, and has a high solidification rate and excellent mixing properties. 9. The aggregate comprises fine aggregate and coarse aggregate, and after the coarse aggregate is mixed with asphalt emulsion mortar whose volume is increased by foaming, the volume is increased by fine aggregate and foaming. The method for producing a room temperature asphalt mixture for pavement according to claim 7, wherein the asphalt emulsion mortar is added and further mixed. 10. The pavement cold room asphalt mixture according to claim 7, 8 or 9, wherein the fine aggregate and / or asphalt emulsion mortar further comprises a filler. Method. 11. The mixture according to claim 7, 8, 9 or 10, wherein the foaming agent is one or more selected from aluminum powder, magnesium powder and zinc powder. Method for producing room temperature asphalt mixture for pavement excellent in pavement. 12. The method according to claim 7, further comprising adding a color pigment and / or a fiber material.
A method for producing a room-temperature asphalt mixture for pavement having a high solidification rate and excellent mixability as described above. 13. The method of claim 7, wherein the volume of the asphalt emulsion mortar is increased by a factor of 2 to 30 due to foaming.
9. The method for producing a room temperature asphalt mixture for pavement according to 9, 10, 11 or 12, which has a high solidification rate and excellent mixing properties.