JP6824462B1 - Asphalt mixture, pavement method, cured product, and method for producing cured product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an asphalt mixture exhibiting excellent strength and its application. SOLUTION: The material comprises at least one selected from the group consisting of asphalt, aggregate, aliphatic carboxylic acid, and aliphatic carboxylic acid ester, an alkaline compound, a water-soluble solid material, and a hydrophilic solid material. An asphalt mixture containing at least one selected from the group, and applications thereof. [Selection diagram] None

Description

The present disclosure relates to asphalt mixtures, pavement methods, cured products, and methods for producing cured products.

The initial rolling temperature of the heated asphalt mixture used in the current pavement method is set, for example, in the range of 110 ° C to 140 ° C. The heated asphalt mixture can exhibit high strength immediately after construction. On the other hand, the pot life of the heated asphalt mixture is limited to the time until the temperature of the heated asphalt mixture decreases. For this reason, when a small amount of the heated asphalt mixture is used in several times, or when the heated asphalt mixture is transported for a long time, it becomes difficult to apply the heated asphalt mixture to the pavement method.

Therefore, an asphalt mixture that can be constructed at a lower temperature than the conventional heated asphalt mixture has been proposed. For example, a cutback asphalt mixture whose viscosity is reduced by mineral oil and a room temperature asphalt mixture using an asphalt emulsion are known (see, for example, Patent Document 1). On the other hand, the pavement method using the asphalt mixture as described above not only takes a long time to open the traffic depending on the volatilization rate of the volatile component, but also has a large environmental load due to the volatile component, so that the usable range is limited. May occur.

A water-curable asphalt mixture has been proposed to solve the above problems. By adding water to the water-curable asphalt mixture, the saponification reaction proceeds and the strength is developed (see, for example, Patent Document 2).

JP-A-11-12475 JP-A-2010-248472

In order to apply the asphalt mixture described in Patent Document 2 not only to small-scale repairs but also to large-scale road pavement, it is necessary to sprinkle water on the asphalt mixture densely spread by a heavy machine such as a finisher. .. However, water does not sufficiently penetrate into the asphalt mixture, and insufficient strength is a problem.

This disclosure has been made in view of the above circumstances.
One aspect of the present disclosure is to provide an asphalt mixture that exhibits excellent strength.
Another aspect of the present disclosure is to provide a pavement method using an asphalt mixture that exhibits excellent strength.
Another aspect of the present disclosure is to provide a cured product having excellent strength.
Another aspect of the present disclosure is to provide a method for producing a cured product having excellent strength.

The present disclosure includes the following aspects.
<1> A group consisting of at least one selected from the group consisting of asphalt, aggregate, aliphatic carboxylic acid, and aliphatic carboxylic acid ester, an alkaline compound, a water-soluble solid material, and a hydrophilic solid material. An asphalt mixture comprising at least one selected from.
<2> In <1>, the water-soluble solid material contains at least one selected from the group consisting of sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polyethylene oxide, and polysaccharides. The asphalt mixture described.
<3> The asphalt according to <1> or <2>, wherein the hydrophilic solid material contains at least one selected from the group consisting of polyvinyl alcohol, polyacrylic acid, metal oxide, metal nitride, and metal. blend.
<4> The asphalt mixture according to any one of <1> to <3>, wherein the average particle size of the water-soluble solid material is 0.3 mm or more.
<5> The asphalt mixture according to any one of <1> to <4>, wherein the average particle size of the hydrophilic solid material is 0.3 mm or more.
<6> Any one of <1> to <5>, wherein the total content of the water-soluble solid material and the hydrophilic solid material is 5% by volume to 20% by volume with respect to the total volume of the asphalt mixture. Asphalt mixture described in 1.
<7> A pavement method comprising supplying water or a water-containing composition to the asphalt mixture according to any one of <1> to <6> and curing the asphalt mixture.
<8> The pavement method according to <7>, wherein the surface tension of the water-containing composition at 20 ° C. is 50 mN / m or less.
<9> The pavement method according to <7>, wherein the surface tension of the water-containing composition at 20 ° C. is 25 mN / m or less.
<10> The pavement method according to any one of <7> to <9>, wherein the water-containing composition contains a surfactant.
<11> The pavement method according to <10>, wherein the surfactant contains an anionic surfactant.
<12> The above-mentioned surfactant contains at least one selected from the group consisting of an ionic surfactant having a sulfonic acid group and an ionic surfactant having a sulfonic acid base <10> or <11>. The pavement method described in.
<13> The cured product of the asphalt mixture according to any one of <1> to <6>.
<14> A composite containing an asphalt mixture and water or a water-containing composition is pressurized at a temperature of 100 ° C. or lower, and the martial stability 24 hours after the pressure is applied to the composite is 2.5 kN or more. The asphalt mixture is water-soluble with at least one selected from the group consisting of asphalt, aggregate, aliphatic carboxylic acid and aliphatic carboxylic acid ester, an alkaline compound, and the like. A method for producing a cured product, which comprises at least one selected from the group consisting of a solid material and a hydrophilic solid material.

According to one aspect of the present disclosure, an asphalt mixture exhibiting excellent strength is provided.
According to another aspect of the present disclosure, a pavement method using an asphalt mixture exhibiting excellent strength is provided.
According to another aspect of the present disclosure, a cured product having excellent strength is provided.
According to another aspect of the present disclosure, a method for producing a cured product having excellent strength is provided.

Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure is not limited to the following embodiments, and can be carried out with appropriate modifications within the scope of the purpose of the present disclosure.

In the present disclosure, the numerical range represented by using "~" means a range including the numerical values before and after "~" as the lower limit value and the upper limit value. In the numerical range described stepwise in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described stepwise. Further, in the numerical range described in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the value shown in the examples.

In the present disclosure, the amount of each component in the composition means the total amount of the plurality of substances present in the composition when a plurality of substances corresponding to each component are present in the composition, unless otherwise specified. ..

In the present disclosure, the term "process" is included in the term "process" as long as the intended purpose of the process is achieved, not only in an independent process but also in cases where it cannot be clearly distinguished from other processes. ..

In the present disclosure, "% by mass" and "% by weight" are synonymous, and "parts by mass" and "parts by weight" are synonymous.

In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment.

<Asphalt mixture>
The asphalt mixture according to one aspect of the present disclosure is at least one selected from the group consisting of (1) asphalt, (2) aggregate, (3) aliphatic carboxylic acid, and aliphatic carboxylic acid ester (hereinafter). , "Carboxylic acid compound"), (4) alkaline compound, (5) water-soluble solid material, and at least one selected from the group consisting of hydrophilic solid material (hereinafter, "specific addition". It may be referred to as "ingredient"), and includes. According to the above aspect, an asphalt mixture exhibiting excellent strength is provided.

The reason why the above effect can be obtained by the asphalt mixture according to one aspect of the present disclosure is presumed as follows. As described above, the conventional asphalt mixture that is cured by the addition of water may cause insufficient strength due to the low permeability of water into the asphalt mixture. Curing of the asphalt mixture according to one aspect of the present disclosure proceeds by a reaction (for example, neutralization or saponification) between the carboxylic acid compound and the alkaline compound, which is promoted in the presence of water. For example, when the asphalt mixture according to one aspect of the present disclosure is brought into contact with water, water permeates into the asphalt mixture due to the dissolution of the water-soluble solid material or the low adhesion between the hydrophilic solid material and the asphalt. Pathways (eg, voids) are formed to improve the permeability of water into the asphalt mixture. Therefore, according to the asphalt mixture according to one aspect of the present disclosure, excellent strength is exhibited.

[asphalt]
The asphalt mixture according to one aspect of the present disclosure includes asphalt.

The type of asphalt is not limited. As the asphalt, known asphalt can be used. Examples of asphalt include natural asphalt and petroleum asphalt. The asphalt may be modified asphalt. Specific examples of asphalt include straight asphalt, blown asphalt, semi-blown asphalt, and polymer-modified asphalt. Polymer-modified asphalt is a polymer (eg, styrene-butadiene-styrene copolymer, styrene-butadiene rubber, styrene-isoprene-styrene copolymer, ethylene-vinyl acetate copolymer, and ethylene-ethyl acrylate copolymer). It is an asphalt containing. The asphalt preferably contains straight asphalt.

The asphalt mixture according to the present disclosure may contain one kind alone or two or more kinds of asphalt.

The asphalt content is not limited. The asphalt content may be determined, for example, according to the intended use and the desired properties. The asphalt content is preferably 0.5% by mass or more and 1% by mass or more with respect to the total mass of the asphalt mixture from the viewpoint of the transportability of the asphalt mixture and the workability of the asphalt mixture. Is more preferable, and 2% by mass or more is particularly preferable. The content of asphalt is 10% by mass with respect to the total mass of the asphalt mixture from the viewpoint of the strength (for example, martial stability) of the cured product of the asphalt mixture (hereinafter, may be referred to as "hardened asphalt product"). It is preferably less than or equal to, more preferably 8% by mass or less, and particularly preferably 6% by mass or less.

The content of asphalt shall be 2% by mass to 15% by mass with respect to the total mass of asphalt and aggregate from the viewpoint of transportability of asphalt mixture, workability of asphalt mixture, and strength of hardened asphalt. Is preferable, and it is more preferably 3% by mass to 8% by mass.

[aggregate]
The asphalt mixture according to one aspect of the present disclosure comprises aggregate.

The type of aggregate is not limited. As the aggregate, a known aggregate can be used. Examples of the aggregate include natural aggregate, artificial aggregate, and regenerated aggregate. Specific aggregates include, for example, sand, gravel, crushed stone (for example, No. 6 crushed stone), steel slag, limestone, stone powder, cement, slaked lime, fly ash, ceramics, sinopearl, aluminum grains, plastic grains, and calsigned bauxite. , Emery, and carbon black. The aggregate preferably contains crushed stone.

The asphalt mixture according to one aspect of the present disclosure may contain one kind alone or two or more kinds of aggregates.

The content of aggregate is not limited. The content of the aggregate may be determined, for example, according to the intended use and the desired characteristics. From the viewpoint of the strength of the asphalt cured product, the content of the aggregate is preferably 75% by mass or more, more preferably 80% by mass or more, and 85% by mass or more with respect to the total mass of the asphalt mixture. Is particularly preferable. The content of the aggregate is preferably 94% by mass or less, preferably 92% by mass or less, based on the total mass of the asphalt mixture, from the viewpoint of the transportability of the asphalt mixture and the workability of the asphalt mixture. More preferably, it is 90% by mass or less.

The content of the aggregate is 85% by mass to 98% by mass with respect to the total mass of the asphalt and the aggregate from the viewpoint of the transportability of the asphalt mixture, the workability of the asphalt mixture, and the strength of the hardened asphalt. It is preferable, and it is more preferable that it is 92% by mass to 97% by mass.

[Carboxylic acid compound]
The asphalt mixture according to one aspect of the present disclosure contains at least one selected from the group consisting of an aliphatic carboxylic acid and an aliphatic carboxylic acid ester (that is, a carboxylic acid compound). The carboxylic acid compound contributes to thickening or curing of the asphalt mixture by reacting (for example, neutralizing or saponifying) with the alkaline compound.

The asphalt mixture according to one aspect of the present disclosure may contain an aliphatic carboxylic acid or an aliphatic carboxylic acid ester. In addition, the asphalt mixture according to one aspect of the present disclosure may contain both an aliphatic carboxylic acid and an aliphatic carboxylic acid. In certain embodiments, the asphalt mixture preferably contains an aliphatic carboxylic acid ester from the viewpoint of kneadability. In certain embodiments, the asphalt mixture preferably contains an aliphatic carboxylic acid from the viewpoint of the strength of the asphalt cured product. In certain embodiments, the asphalt mixture preferably contains both an aliphatic carboxylic acid and an aliphatic carboxylic acid ester from the viewpoint of the transportability of the asphalt mixture, the workability of the asphalt mixture, and the strength of the cured asphalt product. In the present disclosure, when the asphalt mixture contains an aliphatic carboxylic acid or an aliphatic carboxylic acid ester, the term "carboxylic acid compound" may be referred to as "aliphatic carboxylic acid" or "aliphatic carboxylic acid" depending on the type of carboxylic acid compound contained in the asphalt mixture. It shall be read as "aliphatic carboxylic acid ester".

(Alphatic carboxylic acid)
Aliphatic carboxylic acids are aliphatic compounds having at least one carboxy group. As the aliphatic carboxylic acid, a known aliphatic carboxylic acid can be used.

The carbon number of the aliphatic carboxylic acid is preferably 2 to 30, more preferably 10 to 26, and more preferably 16 to 22, from the viewpoint of the kneadability of the asphalt mixture and the strength of the asphalt cured product. Is particularly preferable.

Examples of the aliphatic carboxylic acid include an aliphatic monocarboxylic acid, an aliphatic dicarboxylic acid, and an aliphatic tricarboxylic acid. The aliphatic carboxylic acid may be an aliphatic compound having four or more carboxy groups. Further, the aliphatic carboxylic acid may be a saturated aliphatic carboxylic acid or an unsaturated aliphatic carboxylic acid.

The aliphatic carboxylic acid is preferably a fatty acid, and more preferably a fatty acid having 16 to 22 carbon atoms, from the viewpoint of the transportability of the asphalt mixture and the workability of the asphalt mixture. Fatty acids are aliphatic compounds having one carboxy group (ie, aliphatic monocarboxylic acids). Examples of fatty acids include saturated fatty acids and unsaturated fatty acids.

Saturated fatty acids include, for example, butanoic acid, pentanoic acid, hexanoic acid, heptanic acid, octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, icosanoic acid, docosan. Examples include acids, tetracosanoic acid, hexacosanoic acid, octacosanoic acid, and triacanthanoic acid.

Examples of unsaturated fatty acids include oleic acid (also known as cis-9-octadecenoic acid), linoleic acid (also known as 9,12-octadecadienoic acid), and linolenic acid (also known as 9,12,15-octadeca). Trienoic acid).

The fatty acid is preferably an unsaturated fatty acid, more preferably an unsaturated fatty acid having 16 to 22 carbon atoms, and is oleic acid, from the viewpoint of the kneadability of the asphalt mixture and the strength of the asphalt cured product. Is particularly preferred.

The asphalt mixture according to one aspect of the present disclosure may contain one kind alone or two or more kinds of aliphatic carboxylic acids.

(Aliphatic carboxylic acid ester)
The aliphatic carboxylic acid ester is a compound having a structure in which the hydrogen atom of at least one carboxy group (-COOH) of the aliphatic carboxylic acid is replaced with an organic group (for example, an alkyl group). As the aliphatic carboxylic acid ester, a known aliphatic carboxylic acid ester can be used.

The carbon number of the aliphatic carboxylic acid ester is preferably 2 to 30, more preferably 10 to 26, and more preferably 16 to 22, from the viewpoint of the kneadability of the asphalt mixture and the strength of the asphalt cured product. Is particularly preferred.

Examples of the aliphatic carboxylic acid constituting the partial structure of the aliphatic carboxylic acid ester include the aliphatic carboxylic acid described in the above section "Aliphatic carboxylic acid".

The aliphatic carboxylic acid ester may be an ester of an aliphatic carboxylic acid and a polyhydric alcohol. Examples of the ester of the aliphatic carboxylic acid and the polyhydric alcohol include an ester of a fatty acid and glycerin (that is, fat and oil).

The aliphatic carboxylic acid ester is preferably a fatty acid ester, and more preferably a fatty acid alkyl ester, from the viewpoint of transportability of the asphalt mixture and workability of the asphalt mixture. Further, the aliphatic carboxylic acid ester is preferably at least one selected from the group consisting of fatty acid methyl ester and fatty acid ethyl ester, and more preferably fatty acid ethyl ester. The preferable carbon number of each of the above compounds is the same as the preferable carbon number of the aliphatic carboxylic acid ester.

Examples of fatty acid ethyl esters include ethyl heptanoate, ethyl decanoate, ethyl icosanate, ethyl oleate, and ethyl linoleate. The fatty acid ethyl ester is preferably ethyl oleate.

The asphalt mixture according to one aspect of the present disclosure may contain one kind alone or two or more kinds of aliphatic carboxylic acid esters.

(Content rate)
The content of the carboxylic acid compound is not limited. The content of the carboxylic acid compound may be determined, for example, according to the intended use and the desired properties. From the viewpoint of kneadability of the asphalt mixture, the content of the carboxylic acid compound is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, based on the total mass of the asphalt mixture. , 0.6% by mass or more is particularly preferable. From the viewpoint of the strength of the asphalt cured product, the content of the carboxylic acid compound is preferably 5% by mass or less, more preferably 3% by mass or less, and more preferably 1.5% by mass, based on the total mass of the asphalt mixture. It is particularly preferable that it is mass% or less. In the present disclosure, the "content rate of the carboxylic acid compound" means the total content rate of the aliphatic carboxylic acid and the aliphatic carboxylic acid ester.

The content of the carboxylic acid compound is preferably 10% by mass to 22% by mass with respect to the total mass of the asphalt and the carboxylic acid compound from the viewpoint of the kneadability of the asphalt mixture and the strength of the cured asphalt product. It is more preferably 12% by mass to 20% by mass, and particularly preferably 14% by mass to 18% by mass.

[Alkaline compound]
The asphalt mixture according to one aspect of the present disclosure contains an alkaline compound. The alkaline compound contributes to thickening or hardening of the asphalt mixture by reacting (for example, neutralizing or saponifying) with the carboxylic acid compound.

The type of alkaline compound is not limited as long as it is a compound capable of reacting (for example, neutralizing or saponifying) with a carboxylic acid compound. The alkaline compound may be a compound that produces a chemical species capable of reacting (for example, neutralizing or saponifying) with a carboxylic acid compound by reacting with water. For example, calcium oxide (CaO) can produce calcium hydroxide (Ca (OH) ₂ ) capable of reacting with a carboxylic acid compound by reaction with water.

Examples of the alkaline compound include alkali metal hydroxides (eg, sodium hydroxide and potassium hydroxide), alkali metal oxides (eg, sodium oxide), and alkaline earth metal hydroxides (eg, water). Calcium oxide) and oxides of alkaline earth metals (eg, calcium oxide). Examples of the alkaline compound include sodium hydrogen carbonate and potassium hydrogen carbonate.

The alkaline compound is preferably at least one selected from the group consisting of alkali metal hydroxides, alkali metal oxides, alkaline earth metal hydroxides, and alkaline earth metal oxides.

The asphalt mixture according to one aspect of the present disclosure may contain one kind alone or two or more kinds of alkaline compounds.

The content of alkaline compounds is not limited. The content of the alkaline compound may be determined, for example, according to the intended use and the desired properties. From the viewpoint of the strength of the cured asphalt product, the content of the alkaline compound is preferably 5 ppm or more, more preferably 20 ppm or more, and particularly preferably 50 ppm or more, based on the total mass of the asphalt mixture. .. The content of the alkaline compound is preferably 1,000 ppm or less, more preferably 500 ppm or less, based on the total mass of the asphalt mixture, from the viewpoint of the transportability of the asphalt mixture and the workability of the asphalt mixture. , 100 ppm or less is particularly preferable.

The content ratio of the carboxylic acid compound to the alkaline compound (carboxylic acid compound: alkaline compound) is 20 to 250 on a mass basis from the viewpoint of the transportability of the asphalt mixture, the workability of the asphalt mixture, and the strength of the asphalt cured product. It is preferably 1, more preferably 30 to 200: 1, and particularly preferably 50 to 150: 1.

[Specific additive component]
The asphalt mixture according to one aspect of the present disclosure contains at least one selected from the group consisting of a water-soluble solid material and a hydrophilic solid material (that is, a specific additive component). When the asphalt mixture contains a specific additive component, the permeability of water into the asphalt mixture is improved, and as a result, excellent strength is exhibited. In the present disclosure, when the asphalt mixture contains a water-soluble solid material or a hydrophilic solid material, the term "specific additive component" is referred to as "water-soluble solid material" or "hydrophilic" depending on the type of the specific additive component contained in the asphalt mixture. It shall be read as "sexual solid material".

(Water-soluble solid material)
In the present disclosure, the term "water-soluble" used with respect to a water-soluble solid material means a property of dissolving 5 g or more in 100 g of water having a liquid temperature of 20 ° C. The specific substances exemplified below as the water-soluble solid material have water-solubility regardless of whether or not the term "water-soluble" is explicitly stated.

In the present disclosure, the term "solid" as used with respect to a water-soluble solid material means a solid under an environment of 25 ° C. and standard atmospheric pressure (ie, 1013.25 hPa). The specific substance exemplified below as the water-soluble solid material is a solid regardless of whether or not the term "solid" is specified.

The type of water-soluble solid material is not limited as long as it has the above-mentioned properties. The water-soluble solid material may be a solid material having further hydrophilicity as described in the section "Hydrophilic solid material" below. As the water-soluble solid material, a known water-soluble solid material can be used. Examples of the water-soluble solid material include polyvinyl ether, maleic anhydride polymer, styrene-maleic acid copolymer, sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polyethylene oxide, polysaccharides, and the like. And solid salts.

In certain embodiments, the water-soluble solid material is selected from the group consisting of sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polyethylene oxide, and polysaccharides from the viewpoint of water solubility. It preferably contains seeds, and more preferably contains at least one selected from the group consisting of sodium polyacrylate, polyvinylpyrrolidone, polyacrylamide, polyethylene oxide, and polysaccharides.

In certain embodiments, the water-soluble solid material is selected from the group consisting of sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polyethylene oxide, and polysaccharides from the viewpoint of water solubility. It is preferably a species, and more preferably at least one selected from the group consisting of sodium polyacrylate, polyvinylpyrrolidone, polyacrylamide, polyethylene oxide, and polysaccharides.

-Sodium polyacrylate-
In the present disclosure, "sodium polyacrylate" is a general term for polymers containing a structural unit represented by "-CH _2- CH (COONa)-". A part of the hydrogen atom of the constituent unit represented by "-CH _2- CH (COONa)-" may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. ..

As the sodium polyacrylate, known sodium polyacrylate can be used. Sodium polyacrylate may be a homopolymer or a copolymer. Sodium polyacrylate may contain a structural unit other than the structural unit represented by "-CH _2- CH (COONa)-".

In sodium polyacrylate, the content of the structural unit represented by "-CH _2- CH (COONa)-" is preferably 50% by mass or more, preferably 70% by mass or more, based on the total mass of sodium polyacrylate. It is more preferably mass% or more, and particularly preferably 90 mass% or more. The upper limit of the content rate of the structural unit represented by "-CH _2- CH (COONa)-" is not limited. The content of the structural unit represented by "-CH _2- CH (COONa)-" may be determined in the range of, for example, 100% by mass or less with respect to the total mass of sodium polyacrylate.

The weight average molecular weight of sodium polyacrylate is not limited. The weight average molecular weight of sodium polyacrylate is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

In the present disclosure, in the measurement of the weight average molecular weight, the weight average molecular weight is measured based on the molecular weight of polystyrene, which is a standard substance, by gel permeation chromatography (GPC). That is, the weight average molecular weight is the polystyrene-equivalent weight average molecular weight.

The method for producing sodium polyacrylate is not limited. As a method for producing sodium polyacrylate, a known method can be used. Sodium polyacrylate may be a commercially available product. Examples of commercially available products of sodium polyacrylate include Aquaric (registered trademark) MH (Nippon Shokubai Co., Ltd.).

-Polysodium methacrylate-
In the present disclosure, "polysodium methacrylate" is a general term for polymers containing a structural unit represented by "-CH _2- CCH ₃ (COONa)-". Even if a part of the hydrogen atom of the constituent unit represented by "-CH ₂ -CCH ₃ (COONa)-" is replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. Good.

As the polysodium methacrylate, known polysodium methacrylate can be used. The polysodium methacrylate may be a homopolymer or a copolymer. Polysodium methacrylate may contain a structural unit other than the structural unit represented by "-CH _2- CCH ₃ (COONa)-".

In polysodium methacrylate, the content of the structural unit represented by "-CH _2- CCH ₃ (COONa)-" is preferably 50% by mass or more with respect to the total mass of polysodium methacrylate. It is more preferably 70% by mass or more, and particularly preferably 90% by mass or more. The upper limit of the content rate of the structural unit represented by "-CH _2- CCH ₃ (COONa)-" is not limited. The content of the structural unit represented by "-CH _2- CCH ₃ (COONa)-" may be determined, for example, in the range of 100% by mass or less with respect to the total mass of polysodium methacrylate.

The weight average molecular weight of polysodium methacrylate is not limited. The weight average molecular weight of polysodium methacrylate is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polysodium methacrylate is not limited. As a method for producing polysodium methacrylate, a known method can be used. The polysodium methacrylate may be a commercially available product.

-Polyvinylpyrrolidone-
In the present disclosure, "polyvinylpyrrolidone" is a general term for polymers including a structural unit represented by the following structure (hereinafter, may be referred to as "constituent unit VP"). For convenience, the hydrogen atom is omitted in the structure below. A part of the hydrogen atom of the structural unit represented by the following structure may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure.

As the polyvinylpyrrolidone, known polyvinylpyrrolidone can be used. Polyvinylpyrrolidone may be a homopolymer or a copolymer. Polyvinylpyrrolidone may contain a structural unit other than the structural unit VP.

The content of the structural unit VP is preferably 50% by mass or more, more preferably 70% by mass or more, and particularly preferably 90% by mass or more, based on the total mass of polyvinylpyrrolidone. The upper limit of the content rate of the constituent unit VP is not limited. The content of the structural unit VP may be determined in the range of, for example, 100% by mass or less with respect to the total mass of polyvinylpyrrolidone.

The weight average molecular weight of polyvinylpyrrolidone is not limited. The weight average molecular weight of polyvinylpyrrolidone is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polyvinylpyrrolidone is not limited. As a method for producing polyvinylpyrrolidone, a known method can be used. Polyvinylpyrrolidone may be a commercially available product. Examples of commercially available products of polyvinylpyrrolidone include K-85 (Nippon Shokubai Co., Ltd.).

-Polyacrylamide-
In the present disclosure, "polyacrylamide" is a general term for polymers containing a structural unit represented by "-CH _2- CH (CONH ₂ )-". A part of the hydrogen atom of the constituent unit represented by "-CH _2- CH (CONH ₂ )-" may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. Good.

As the polyacrylamide, known polyacrylamide can be used. Polyacrylamide may be a homopolymer or a copolymer. Polyacrylamide may contain a structural unit other than the structural unit represented by "-CH _2- CH (CONH ₂ )-".

In polyacrylamide, the content of the structural unit represented by "-CH _2- CH (CONH ₂ )-" is preferably 50% by mass or more, preferably 70% by mass or more, based on the total mass of polyacrylamide. Is more preferable, and 90% by mass or more is particularly preferable. The upper limit of the content rate of the structural unit represented by "-CH _2- CH (CONH ₂ )-" is not limited. The content of the structural unit represented by "-CH _2- CH (CONH ₂ )-" may be determined in the range of, for example, 100% by mass or less with respect to the total mass of polyacrylamide.

The weight average molecular weight of polyacrylamide is not limited. The weight average molecular weight of polyacrylamide is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polyacrylamide is not limited. As a method for producing polyacrylamide, a known method can be used. Polyacrylamide may be a commercially available product. Examples of commercially available products of polyacrylamide include AQ nylon (Toray Industries, Inc., for example, A-90).

-Polyethyleneimine-
In this disclosure, the term "polyethylenimine", _- polymer which is a generic term including a structural unit represented by the "CH ₂ -CH 2 -NH-". A part of the hydrogen atom of the constituent unit represented by "-CH _2- CH _2- NH-" may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. ..

As the polyethyleneimine, known polyethyleneimine can be used. Polyethyleneimine may be a homopolymer or a copolymer. Polyethyleneimine may contain a structural unit other than the structural unit represented by "-CH _2- CH _2- NH-".

In polyethyleneimine, the content of the structural unit represented by "-CH _2- CH _2- NH-" is preferably 50% by mass or more, preferably 70% by mass or more, based on the total mass of polyethyleneimine. It is more preferable to have it, and it is particularly preferable that it is 90% by mass or more. The upper limit of the content rate of the structural unit represented by "-CH _2- CH _2- NH-" is not limited. The content of the structural unit represented by "-CH _2- CH _2- NH-" may be determined in the range of, for example, 100% by mass or less with respect to the total mass of polyethyleneimine.

The weight average molecular weight of polyethyleneimine is not limited. The weight average molecular weight of polyethyleneimine is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polyethyleneimine is not limited. As a method for producing polyethyleneimine, a known method can be used. Polyethyleneimine may be a commercially available product.

-Polyethylene oxide-
In this disclosure, the term "polyethylene oxide", - is a polymer generic term that includes a structural unit represented by the "CH 2 _-CH 2 _-O-". A part of the hydrogen atom of the constituent unit represented by "-CH _2- CH _2- O-" may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. ..

As the polyethylene oxide, a known polyethylene oxide can be used. The polyethylene oxide may be a homopolymer or a copolymer. The polyethylene oxide may contain a structural unit other than the structural unit represented by "-CH _2- CH _2- O-".

In polyethylene oxide, the content of the structural unit represented by "-CH _2- CH _2- O-" is preferably 50% by mass or more, preferably 70% by mass or more, based on the total mass of polyethylene oxide. It is more preferable that there is 90% by mass or more. The upper limit of the content rate of the structural unit represented by "-CH _2- CH _2- O-" is not limited. The content of the structural unit represented by "-CH _2- CH _2- O-" may be determined in the range of, for example, 100% by mass or less with respect to the total mass of polyethylene oxide.

The weight average molecular weight of polyethylene oxide is not limited. The weight average molecular weight of polyethylene oxide is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polyethylene oxide is not limited. As a method for producing polyethylene oxide, a known method can be used. The polyethylene oxide may be a commercially available product. Examples of commercially available polyethylene oxide products include PEO-3 (Sumitomo Seika Chemical Co., Ltd.).

-Polysaccharide-
In the present disclosure, "polysaccharide" is a general term for compounds in which two or more monosaccharides are glycosidic bonded. As the polysaccharide, known polysaccharides can be used. The monosaccharides constituting the polysaccharide may be one type alone or two or more types of monosaccharides. Polysaccharides include, for example, disaccharides (eg, sucrose, maltose, and lactose), trisaccharides (eg, raffinose), and tetrasaccharides (eg, stachyose). Polysaccharides include oligosaccharides. The polysaccharide is preferably a disaccharide, more preferably sucrose. Examples of commercially available sucrose products include "middle-zara sugar" (Nissin Sugar Co., Ltd.).

-Solid salt-
In the present disclosure, "solid salt" is a general term for solid sodium chloride crystals. As the solid salt, a known solid salt can be used. Examples of commercially available solid salt products include "salt" (Salt Industry Center of Japan) and "Himalayan rock salt" (FR Co., Ltd.). Moreover, you may use the solid salt containing potassium chloride.

-Shape-
The shape of the water-soluble solid material is not limited. The shape of the water-soluble solid material may be, for example, spherical, polyhedral, or amorphous. The water-soluble solid material is preferably a particulate water-soluble solid material.

The method of molding a water-soluble solid material is not limited. Examples of the method for molding a water-soluble solid material include extrusion molding. As a method of extrusion molding, a known method can be used. For example, a water-soluble solid material can be formed by extruding a molten water-soluble solid material using an extruder and then cutting the cooled water-soluble solid material into a desired shape.

The water-soluble solid material may be used, for example, by adsorbing or coating the above-mentioned aggregate.

− Particle size −
The average particle size of the water-soluble solid material is preferably 0.3 mm or more, more preferably 0.4 mm or more, and particularly preferably 0.5 mm or more. When the average particle size of the water-soluble solid material is in the above range, the permeability of water into the asphalt mixture can be improved. The average particle size of the water-soluble solid material is preferably 5 mm or less, more preferably 4 mm or less, and particularly preferably 3 mm or less. When the average particle size of the water-soluble solid material is in the above range, the strength of the asphalt cured product can be improved.

In the present disclosure, the average particle size is calculated by the following method. The particle size of each measurement object is measured by directly observing 100 measurement objects arbitrarily selected using a microscope. The "particle diameter" here means a circle-equivalent diameter converted from the area of the object to be measured in the observation image. The value obtained by averaging 100 measured values is defined as the average particle size. As the microscope, for example, an optical microscope or an electron microscope is used. Examples of the optical microscope include OLS4500 (Olympus Corporation), SZX16 (Olympus Corporation), and VK-X120 (Keyence Corporation). As the electron microscope, for example, a scanning electron microscope or a transmission electron microscope is used. Examples of the scanning electron microscope include JSM-7401 (JEOL Ltd.). Examples of the transmission electron microscope include HT7700 (Hitachi High-Technologies Corporation).

The asphalt mixture according to one aspect of the present disclosure may contain one kind alone or two or more kinds of water-soluble solid materials.

(Hydrophilic solid material)
In the present disclosure, the term "hydrophilic" used with respect to a hydrophilic solid material means a property having a high affinity for water. The specific substances exemplified below as hydrophilic solid materials have hydrophilicity regardless of whether or not the term "hydrophilic" is explicitly stated.

In the present disclosure, the term "solid" as used with respect to a hydrophilic solid material means a solid under an environment of 25 ° C. and standard atmosphere (ie, 1013.25 hPa). The specific substance exemplified below as the hydrophilic solid material is a solid regardless of whether or not the term "solid" is specified.

The type of hydrophilic solid material is not limited as long as it has the above-mentioned properties. The hydrophilic solid material may be a solid material having further water solubility described in the above section "Water-soluble solid material". The hydrophilic solid material is preferably a solid material having no water solubility as described in the above section "Water-soluble solid material". As the hydrophilic solid material, a known hydrophilic solid material can be used. Examples of the hydrophilic solid material include a hydrophilic organic solid material and a hydrophilic inorganic solid material.

-Hydrophilic organic solid material-
The hydrophilic organic solid material is preferably an organic compound having a ClogP value of 1 or less, and more preferably a polymer containing a structural unit derived from a monomer having a ClogP value of 1 or less. The ClogP value is an estimated value of the "octanol / water partition coefficient" calculated by the method described later. The ClogP value is preferably 0.9 or less, more preferably 0.8 or less. The lower limit of the ClogP value is not limited. When setting the lower limit of the ClogP value, the ClogP value may be determined, for example, in the range of -12 or more.

In the present disclosure, the ClogP value is calculated by the following method. After extracting the organic solid material with a solvent, the components contained in the extract by known analytical methods (eg, nuclear magnetic resonance spectroscopy (NMR), infrared spectroscopy (IR), and thermal decomposition gas chromatography). By measuring and analyzing the above, the chemical structure of the components of the organic solid material is confirmed. Examples of the solvent include methanol, water, and dimethylformamide (DMF). However, if the organic solid material cannot be extracted using a solvent, the organic solid material is finely crushed and then sprinkled with potassium bromide (KBr), and the components of the organic solid material are measured by infrared spectroscopy (IR). And analysis, and decomposition of the object to be measured using supercritical methanol or strong acid, known methods (eg, mass spectrometry, nuclear magnetic resonance spectroscopy (NMR), infrared spectroscopy (IR), and heat. Decomposition gas chromatography) is used to measure and analyze the components of the organic solid material to confirm the chemical structure of the components of the organic solid material. Based on the chemical structure of the components of the organic solid material identified by the method described above, the CLOGP value is calculated using the CLOGP program incorporated in the "ChemBioDraw Ultra" of CambridgeSoft. The ClogP value of the monomer in the "polymer containing a structural unit derived from a monomer having a ClogP value of 1 or less" is estimated from the chemical structure of the structural unit of the polymer identified by the above method. Calculated based on the chemical structure of the monomer.

In the present disclosure, the term "monomer-derived structural unit" includes a structural unit actually formed from a specific monomer and a structural unit that can be regarded as being formed from a specific monomer. .. The "constituent unit that can be regarded as being formed from a specific monomer" means a structural unit conceptually formed from a virtual monomer. In other words, the term "monomer" used with respect to "monomer-derived building blocks" is not limited to the monomer that actually formed the building blocks, but is virtually derived directly from the chemical structure of the building blocks. It may be a monomer of. Hereinafter, the term “monomer-derived structural unit” will be described using the above-mentioned sodium polyacrylate as a typical example. For example, in sodium polyacrylate, the structural unit represented by "-CH _2- CH (COONa)-" is not limited to sodium acrylate, but other structural units (for example, "-CH _2- CH (COOH)-". It can be formed through chemical modification of the structural unit (represented by). In the latter case, the "constituent unit derived from sodium acrylate" is acrylic acid, which is a virtual monomer derived from the chemical structure of the structural unit represented by "-CH _2- CH (COONa)-". It can be considered to be formed from sodium. The chemical structure of the structural unit can be confirmed by the method described in the method for calculating the ClogP value.

Examples of the monomer having a ClogP value of 1 or less include vinyl acetate (ClogP value: 0.73), vinyl alcohol (ClogP value: 0.26), acrylic acid (ClogP value: 0.46), and acrylamide. (ClogP value: -1.65).

Hereinafter, the relationship between the monomer and the chemical structure of the structural unit derived from the monomer will be described. Structural units derived from vinyl acetate, _{"- CH 2 -CH (-O-CO} -CH 3) - " represented by. The structural unit derived from vinyl alcohol is represented by "-CH _2- CH (OH)-". The structural unit derived from acrylic acid is represented by "-CH _2- CH (COOH)-". The structural unit derived from acrylamide is represented by "-CH _2- CH (CONH ₂ )-".

The polymer containing a structural unit derived from a monomer having a ClogP value of 1 or less may be a homopolymer or a copolymer. The polymer containing a structural unit derived from a monomer having a ClogP value of 1 or less may be a polymer containing a structural unit other than the structural unit derived from a monomer having a ClogP value of 1 or less.

Examples of the polymer containing a structural unit derived from a monomer having a ClogP value of 1 or less include polyvinyl acetate, polyvinyl alcohol, polyacrylic acid, and polyacrylamide. The polymer containing a structural unit derived from a monomer having a ClogP value of 1 or less is preferably polyvinyl alcohol or polyacrylic acid, and more preferably polyvinyl alcohol.

In the present disclosure, "polyvinyl alcohol" is a general term for polymers containing a structural unit represented by "-CH _2- CH (OH)-". A part of the hydrogen atom of the constituent unit represented by "-CH _2- CH (OH)-" may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. ..

As the polyvinyl alcohol, known polyvinyl alcohol can be used. The polyvinyl alcohol may be a homopolymer or a copolymer. Polyvinyl alcohol may contain a structural unit other than the structural unit represented by "-CH _2- CH (OH)-". Polyvinyl alcohols are, for example, _{"- CH 2 -CH (-O-CO} -CH 3) - " configuration units represented by, and _{"-CH 2 -CH (-O-CO-} CH 2 -CO-CH 3 )-”May include at least one selected from the group consisting of the structural units represented by.

In polyvinyl alcohol, the content of the structural unit represented by "-CH _2- CH (OH)-" is preferably 50% by mass or more, preferably 70% by mass or more, based on the total mass of polyvinyl alcohol. It is more preferable that the content is 90% by mass or more. The upper limit of the content rate of the structural unit represented by "-CH _2- CH (OH)-" is not limited. The content of the structural unit represented by "-CH _2- CH (OH)-" may be determined, for example, in the range of 100% by mass or less with respect to the total mass of polyvinyl alcohol.

The weight average molecular weight of polyvinyl alcohol is not limited. The weight average molecular weight of polyvinyl alcohol is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polyvinyl alcohol is not limited. As a method for producing polyvinyl alcohol, a known method can be used. Polyvinyl alcohol may be a commercially available product. Examples of commercially available polyvinyl alcohol products include Gosenex Z series (Mitsubishi Chemical Corporation, for example, Z-220).

In the present disclosure, "polyacrylic acid" is a general term for polymers containing a structural unit represented by "-CH _2- CH (COOH)-". A part of the hydrogen atom of the constituent unit represented by "-CH _2- CH (COOH)-" may be replaced by an atom other than the hydrogen atom or an atomic group without departing from the spirit of the present disclosure. ..

As the polyacrylic acid, a known polyacrylic acid can be used. The polyacrylic acid may be a homopolymer or a copolymer. The polyacrylic acid may contain a structural unit other than the structural unit represented by "-CH _2- CH (COOH)-".

In polyacrylic acid, the content of the structural unit represented by "-CH _2- CH (COOH)-" is preferably 50% by mass or more, preferably 70% by mass, based on the total mass of polyacrylic acid. The above is more preferable, and 90% by mass or more is particularly preferable. The upper limit of the content rate of the structural unit represented by "-CH _2- CH (COOH)-" is not limited. The content of the structural unit represented by "-CH _2- CH (COOH)-" may be determined in the range of, for example, 100% by mass or less with respect to the total mass of polyacrylic acid.

The weight average molecular weight of polyacrylic acid is not limited. The weight average molecular weight of polyacrylic acid is preferably 500 to 1,000,000, more preferably 750 to 100,000, and particularly preferably 1,000 to 10,000.

The method for producing polyacrylic acid is not limited. As a method for producing polyacrylic acid, a known method can be used. The polyacrylic acid may be a commercially available product.

-Hydrophilic inorganic solid material-
Examples of the hydrophilic inorganic solid material include metal oxides, metal nitrides, metal carbonates, metal sulfates, metal carbides, metal sulfides, and metals. The hydrophilic inorganic solid material is preferably a metal oxide, a metal nitride, or a metal.

Examples of the metal oxide include silicon dioxide (SiO ₂ ), zirconium dioxide (ZrO ₂ ), and aluminum oxide (Al ₂ O ₃ ). The metal oxide is preferably silicon dioxide or zirconium dioxide. Examples of commercially available products of zirconium dioxide include "zirconia ball YTZ-3" (Nikkato Corporation).

As the metal nitride, for example, silicon nitride _{(Si 3 N} 4), and aluminum nitride (AlN) and the like. Examples of commercially available silicon nitride products include "Silicon Nitride Ball SUN-12 φ1" (Nikkato Corporation).

Examples of the metal include aluminum (Al) and iron (Fe). The metal may be a simple substance metal or an alloy. For example, a film of a metal oxide may be formed on the surface of the metal. Examples of commercially available aluminum products include "aluminum ball φ2 mm" (As One Corporation).

The hydrophilic inorganic material may be a composition containing the above-mentioned components. Examples of the composition containing silicon dioxide include glass. Examples of commercially available glass products include "glass beads (soda glass)" (AS ONE Corporation) and "glass beads BZ-1" (AS ONE Corporation). Further, as a commercially available product of glass, for example, recycled glass granulated sand such as "Sandwave G" (Toei Co., Ltd.) can also be preferably used.

-Preferable type of hydrophilic solid material-
In certain embodiments, the hydrophilic solid material preferably comprises at least one selected from the group consisting of polyvinyl alcohol, polyacrylic acid, metal oxides, metal nitrides, and metals from the viewpoint of hydrophilicity. It is more preferable to contain at least one selected from the group consisting of polyvinyl alcohol and metal oxides. A combination in which part or all of the metal oxide is replaced with glass is also preferable.

In certain embodiments, the hydrophilic solid material is preferably at least one selected from the group consisting of polyvinyl alcohol, polyacrylic acid, metal oxides, metal nitrides, and metals from the viewpoint of hydrophilicity. More preferably, it is at least one selected from the group consisting of polyvinyl alcohol and metal oxides. A combination in which part or all of the metal oxide is replaced with glass is also preferable.

In certain embodiments, the hydrophilic solid material preferably comprises glass from the standpoint of hydrophilicity.

-Shape-
The shape of the hydrophilic solid material is not limited. The shape of the hydrophilic solid material may be, for example, spherical, polyhedral, or amorphous. The hydrophilic solid material is preferably a particulate hydrophilic solid material.

Examples of the method for molding a hydrophilic solid material include extrusion molding. For example, the hydrophilic solid material can be molded by the extrusion molding described in the above section "Water-soluble solid material".

− Particle size −
The average particle size of the hydrophilic solid material is preferably 0.3 mm or more, more preferably 0.4 mm or more, and particularly preferably 0.5 mm or more. When the average particle size of the hydrophilic solid material is in the above range, the permeability of water into the asphalt mixture can be improved. The average particle size of the hydrophilic solid material is preferably 5 mm or less, more preferably 4 mm or less, and particularly preferably 3 mm or less. When the average particle size of the hydrophilic solid material is in the above range, the strength of the asphalt cured product can be improved.

The asphalt mixture according to one aspect of the present disclosure may contain one kind alone or two or more kinds of hydrophilic solid materials.

(Content rate)
The content of the specific additive component is preferably 3% by volume or more, more preferably 5% by volume or more, still more preferably 8% by volume or more, based on the total volume of the asphalt mixture. It is particularly preferable that the volume is% or more. When the content of the specific additive component is in the above range, the permeability of water into the asphalt mixture can be improved. The content of the specific additive component is preferably 20% by volume or less, more preferably 16% by volume or less, still more preferably 12% by volume or less, based on the total volume of the asphalt mixture, 8%. It is particularly preferable that the volume is% or less. When the content of the specific additive component is within the above range, the strength of the asphalt cured product can be improved. In the present disclosure, the "content rate of the specific additive component" means the total content rate of the water-soluble solid material and the hydrophilic solid material.

[Other ingredients]
The asphalt mixture according to one aspect of the present disclosure may contain components other than the above-mentioned components (hereinafter, referred to as "other components"), if necessary. Other components include, for example, various additives added to known asphalt mixtures. Specific examples of other components include resins (including natural polymer compounds and synthetic polymer compounds), cutback agents, organic solvents, surfactants, and emulsifiers. Examples of the cutback agent include mineral oil, tar, pitch, gasoline, kerosene, A heavy oil, B heavy oil, and C heavy oil.

[Production method]
The method for producing an asphalt mixture according to one aspect of the present disclosure is not limited as long as it is a method capable of producing an asphalt mixture containing each of the above-mentioned components. For example, an asphalt mixture can be produced by mixing the above-mentioned components as raw materials by a known method. In the above production method, all raw materials may be mixed at the same time. Further, in the above-mentioned mixing method, the raw materials may be sequentially mixed.

In the method for producing an asphalt mixture according to one aspect of the present disclosure, a composition containing at least one selected from the group consisting of asphalt, aggregate, carboxylic acid compound, and alkaline compound may be used as a raw material. For example, an asphalt mixture can be produced by mixing the above composition with a specific additive component. Examples of commercially available products of the above composition include "mild patch" (Maeda Road Co., Ltd.).

In the method for producing an asphalt mixture according to one aspect of the present disclosure, as a source of a carboxylic acid compound (that is, at least one selected from the group consisting of an aliphatic carboxylic acid and an aliphatic carboxylic acid ester), for example, tall. Compositions such as oil may be used. As the tall oil, known tall oil can be used.

[Use]
Since the asphalt mixture according to one aspect of the present disclosure can exhibit excellent strength, it can be used for various asphalt pavements. By using the asphalt mixture according to one aspect of the present disclosure, for example, the road surface can be paved. The asphalt mixture according to one aspect of the present disclosure can also be used for repairing asphalt pavement.

<Pavement method>
The pavement method according to one aspect of the present disclosure is not limited as long as it is a method using an asphalt mixture according to one aspect of the present disclosure. According to the above aspect, a paving method using an asphalt mixture exhibiting excellent strength is provided. The pavement method according to one aspect of the present disclosure preferably includes supplying water or a water-containing composition to the asphalt mixture according to one aspect of the present disclosure and curing the asphalt mixture. The reaction (eg, neutralization or saponification) of the carboxylic acid compound with the alkaline compound, which is promoted by supplying water or a water-containing composition to the asphalt mixture, cures the asphalt mixture. By curing the asphalt mixture, a cured product of the asphalt mixture is obtained.

[Asphalt mixture]
The asphalt mixture applied to the pavement method according to one aspect of the present disclosure is synonymous with the asphalt mixture described in the section "Asphalt mixture" above. The preferred embodiment of the asphalt mixture applied to the pavement method according to one aspect of the present disclosure is the same as the preferred embodiment of the asphalt mixture described in the above section "Asphalt mixture". The asphalt mixture applied to the pavement method according to one aspect of the present disclosure may be prepared prior to the supply of water or a water-containing composition.

[water]
Water promotes the reaction of carboxylic acid compounds with alkaline compounds in asphalt mixtures. The type of water is not limited. Examples of water include tap water, groundwater, distilled water, ion-exchanged water, and industrial water.

[Water-containing composition]
The water-containing composition is a composition containing at least water. The water-containing composition promotes the reaction of the carboxylic acid compound with the alkaline compound in the asphalt mixture. The water-containing composition may be an aqueous solution or a dispersion. The water-containing composition is preferably an aqueous solution from the viewpoint of the permeability of the asphalt mixture into the inside.

(surface tension)
The surface tension of the water-containing composition at 20 ° C. is preferably 50 mN / m or less, more preferably 25 mN / m or less, and particularly preferably 20 mN / m or less. When the surface tension of the water-containing composition is within the above range, the permeability of the water-containing composition into the asphalt mixture can be improved. The lower limit of the surface tension of the water-containing composition is not limited. When setting the lower limit of the surface tension, the surface tension of the water-containing composition at 20 ° C. may be determined, for example, in the range of 5 mN / m or more. The surface tension is measured using a surface tension meter (for example, a fully automatic surface tension meter CBVP-Z manufactured by Kyowa Interface Science Co., Ltd.). The temperature of the measurement sample is 20 ° C. The surface tension of the water-containing composition can be adjusted, for example, according to the composition of the water-containing composition.

(component)
Examples of the water in the water-containing composition include the water described in the above section "Water".

In the water-containing composition, components other than water are not limited. Examples of components other than water include surfactants and organic solvents. The water-containing composition may further contain the alkaline compounds described in the section "Alkaline compounds" above. The inclusion of the alkaline compound in the water-containing composition can further accelerate the curing of the asphalt mixture. The water-containing composition may contain one kind alone or two or more other kinds of other components. The water-containing composition preferably contains water and a component that reduces the surface tension of the water-containing composition. Also, for example, cleaning liquids such as "Asphalt Clean" (Yokohama Oil & Fat Co., Ltd.), "Family Fresh" (Kao Corporation), and "Mama Lemon" (Lion Corporation) may be used as the water-containing composition. Can be done.

-Surfactant-
The water-containing composition preferably contains a surfactant. When the water-containing composition contains a surfactant, the surface tension of the water-containing composition can be adjusted. Further, when the water-containing composition contains a surfactant, the water-drainability of the cured asphalt product can be improved.

Examples of the surfactant include an ionic surfactant and a nonionic surfactant. Examples of the ionic surfactant include a cationic surfactant, an anionic surfactant, and an amphoteric surfactant. The surfactant preferably contains an ionic surfactant, and more preferably contains an anionic surfactant.

Examples of the cationic surfactant include alkyltrimethylammonium salts (for example, stearyltrimethylammonium chloride and lauryltrimethylammonium chloride), dialkyldimethylammonium salts (for example, distearyldimethylammonium chloride), and alkylpyridinium salts (for example, chloride). Poly (N, N dimethyl-3,5-methylenepiperidinium), and cetylpyridinium chloride), alkyl quaternary ammonium salt, alkyldimethylbenzylammonium salt, alkylisoquinolinium salt, dialkylmoriphonium salt, polyoxy Examples thereof include ethylene alkylamines, alkylamine salts, polyamine fatty acid derivatives, ammonium alcohol fatty acid derivatives, benzalconium chloride, and benzethonium chloride. Commercially available products of cationic non-fluorine-based surfactants include, for example, phthalocyanine derivatives (Morishita Sangyo Co., Ltd., for example, EFKA-745), organosiloxane polymers KP341 (Shinetsu Chemical Industry Co., Ltd.), (meth) acrylic acid-based (meth) acrylic acid-based products. Co) Polymer polyflow (Kyoeisha Chemical Co., Ltd., for example, No. 75, No. 90, and No. 95), and W001 (Yusho Co., Ltd.) can be mentioned. Examples of the cationic surfactant include various cationic surfactants described later.

Examples of the anionic surfactant include higher fatty acid salts (for example, potassium stearate and potassium behenate), alkyl ether carboxylate (for example, sodium polyoxyethylene lauryl ether carboxylate), and N-acyl-L-. Glutamate (eg, N-stearoyl-L-glutamic acid monosodium salt), higher alkyl sulfate (eg, sodium lauryl sulfate, and potassium lauryl sulfate), polyoxyethylene lauryl sulfate triethanolamine, alkyl ether sulfate (eg, alkyl ether sulfate) For example, polyoxyethylene lauryl sulfate sodium), N-acylsulfosinate (eg sodium lauroyl sarcosin), alkyl phosphate (eg sodium stearyl phosphate), alkyl ether phosphate (eg polyoxyethylene oleyl ether). Sodium phosphate and polyoxyethylene stearyl ether sodium phosphate), and higher fatty acid ester sulfates (eg, cured coconut oil fatty acid sodium glycyl sulfate). Commercially available products of anionic non-fluorinated surfactants include, for example, Lapizol (registered trademark) A-90 (NOF CORPORATION), Lapizol A-80 (NOF CORPORATION), and Lapizol BW-30 (NOF CORPORATION). Lapizol B-90 (NOF CORPORATION), Lapizol C-70 (NOF CORPORATION), NIKKOL (registered trademark) OTP-100 (Nikko Chemicals Co., Ltd.), Kohakul (registered trademark) ON (Toho Chemical Co., Ltd.) Kogyo Co., Ltd.), Koracool L-40 (Toho Chemical Industry Co., Ltd.), Phosphanol (registered trademark) 702 (Toho Chemical Industry Co., Ltd.), Beaulite (registered trademark) A-5000 (Sanyo Kasei Kogyo Co., Ltd.), Viewlight SSS (Sanyo Kasei Kogyo Co., Ltd.), Sanded (registered trademark) BL (Sanyo Kasei Kogyo Co., Ltd.), Sodium = Bis (3, 3, 4, 4, 5, 5, 6, 6, 6-Nonafluoro) = 2-Sulfonite oxysuccinate (Fujifilm Wako Pure Chemicals Co., Ltd.) can be mentioned. Examples of the anionic surfactant include various anionic surfactants described later.

Commercially available nonionic surfactants include, for example, Naroacty (registered trademark) CL-95 (Sanyo Kasei Kogyo Co., Ltd.), Naroacty HN-100 (Sanyo Kasei Kogyo Co., Ltd.), and Lisolex (registered trademark) BW400. (Higher Alcohol Industry Co., Ltd.), EMALEX (registered trademark) ET-2020 (Japan Emulsion Co., Ltd.), Unilube (registered trademark) 50MB-26 (Nichiyu Co., Ltd.), and Nonionic (registered trademark) IS-4 (Nichiyu) Co., Ltd.).

Examples of the surfactant include the surfactants described in "Surfactant Handbook" (edited by Nishiichiro, Yachiichiro Imai, Masazo Kasai, Sangyo Tosho Co., Ltd., published in 1960).

The surfactant preferably has a sulfonic acid group or a sulfonic acid base, and more preferably has a sulfonic acid base. When the surfactant has a sulfonic acid group or a sulfonic acid base, the surface tension of the water-containing composition can be reduced. Sulfonic acid group, - a group represented by "SO 3 _H". Surfactants may have one or more sulfonic acid groups. A sulfonic acid base is a group having the form of a sulfonate represented by "-SO ₃ ^- M ⁺ ". M ⁺ is a cation. Examples of M ⁺ include alkali metal cations and basic compound cations. Examples of the alkali metal include potassium and sodium. Examples of the basic compound include amines. Surfactants may have one or more sulfonic acid bases.

The surfactant preferably contains at least one selected from the group consisting of an ionic surfactant having a sulfonic acid group and an ionic surfactant having a sulfonic acid base, and is anionic having a sulfonic acid group. It is more preferable to contain at least one selected from the group consisting of a surfactant and an anionic surfactant having a sulfonic acid base, and it is particularly preferable to contain an anionic surfactant having a sulfonic acid base.

Examples of the anionic surfactant having a sulfonic acid base include a higher fatty acid amide sulfonate (for example, N-myristoyl-N-methyltaurine sodium) and an alkylbenzene sulfonate (sodium dodecylbenzenesulfonate, dodecylbenzenesulfone). Acid triethanolamine and sodium dodecyldiphenyloxide disulfonate).

The surfactant preferably contains a surfactant containing a fluorine atom (also referred to as a fluorine-based surface active agent), and more preferably contains an anionic surfactant containing a fluorine atom. When the surfactant contains a surfactant containing a fluorine atom, the surface tension of the water-containing composition can be reduced.

Surfactants containing a fluorine atom preferably have a perfluoroalkyl group in the molecule. The number of carbon atoms in the alkyl moiety of the perfluoroalkyl group is preferably 1 to 12, and more preferably 1 to 10. Examples of the perfluoroalkyl group include a perfluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, a perfluorooctyl group, and a perfluorononyl group.

The surfactant containing a fluorine atom preferably has a sulfonic acid group or a sulfonic acid base, and more preferably has a sulfonic acid base. Surfactants containing a fluorine atom may have one or more sulfonic acid groups. Surfactants containing a fluorine atom may have one or more sulfonic acid bases.

Surfactants containing a fluorine atom include, for example, anionic surfactants (eg, perfluoroalkyl carboxylic acid salts, perfluoroalkyl sulfonates, and perfluoroalkyl sulfonates), amphoteric surfactants (eg, perfluoroalkyl phosphates). Perfluoroalkyl betaine), cationic surfactants (eg, perfluoroalkyltrimethylammonium salts), perfluoroalkylamine oxides, and perfluoroalkylethylene oxide adducts.

Specific examples of the surfactant containing a fluorine atom include potassium trifluoromethanesulfonate, potassium perfluorobutanesulfonate, potassium perfluorohexanesulfonate, potassium perfluorooctanesulfonate, sodium pentafluoroethanesulfonate, and per. Sodium fluorobutane sulfonate, sodium perfluorooctane sulfonate, sodium = bis (3, 3, 4, 4, 5, 5, 6, 6, 6-nonafluoro) = 2-sulfonitoxysuccinate, and below Examples include compounds.

Commercially available products of fluorine-based surfactants include, for example, Megafuck series (DIC Co., Ltd., for example, F114, F142D, F172, F173, F176, F177, F183, F410, F444, F477, F479, F482, F553, F554. , F556, F780, F781, F781-F, R30, R08, F-472SF, BL20, R-61, and R-90), Florard Series (3M, eg FC-135, FC-170C, FC- 430, FC-431, and FC171), Novec FC-4430 (3M), Asahi Guard Series (AGC Co., Ltd., eg AG7105, AG7000, AG950, AG7600), Surflon Series (AGC Ltd., eg S- 112, S-113, S-131, S-141, S-145, S-221, S-221, S-231, S-232, S-233, S-241, S-382, SC-101, SC-102, SC-103, SC-104, SC-105, and SC-106), Ftop Series (Mitsubishi Materials Electronics Chemical Co., Ltd., for example, EF351, EF352, EF801, and EF802), Futergent Series (Neos) Co., Ltd., for example, 100, 150, 212M, 215M, 222F, 250, 320, 400SW, 602A, 681, and 683), KP series (Shinetsu Chemical Industry Co., Ltd.), Polyflow series (Kyoeisha Chemical Co., Ltd.), PolyFox Examples include the series (OMNOVA Solutions) and the DISPERBYK series (Big Chemie Japan Co., Ltd.).

The surfactant preferably contains a surfactant containing a siloxane bond (also referred to as a silicone-based surface active agent). When the surfactant contains a surfactant containing a siloxane bond, the surface tension of the water-containing composition can be reduced.

Examples of the surfactant containing a siloxane bond include an unmodified silicone-based surfactant, a polyether-modified silicone-based surfactant, a polyester-modified silicone-based surfactant, an alkyl-modified silicone-based surfactant, and an aralkyl-modified silicone-based surfactant. Examples thereof include activators and reactive silicone-based surfactants.

Examples of commercially available products of surfactants containing a siloxane bond include BYK series (Big Chemie Japan Co., Ltd., for example, BYK-345, BYK-346, BYK-347, BYK-348, and BYK-349). ..

The surfactant preferably contains a sulfosuccinic acid-based surfactant, and more preferably contains a dialkylsulfosuccinate represented by the following formula 1. When the surfactant contains a sulfosuccinic acid-based surfactant, the surface tension of the water-containing composition can be reduced.

In formula 1, R ¹ and R ² each independently represent an alkyl group having 4 or more carbon atoms, and M represents sodium (Na) or potassium (K).

In formula 1, the alkyl groups represented by R ¹ and R ² have 4 or more carbon atoms, preferably 6 or more carbon atoms. The number of carbon atoms of the alkyl group represented by R ¹ and R ² is preferably 12 or less, more preferably 10 or less, and particularly preferably 8 or less. Examples of the alkyl group having 4 or more carbon atoms include an n-butyl group, a t-butyl group, a pentyl group, a 1-ethylpentyl group, a hexyl group, a heptyl group, an octyl group, and a nonyl group.

In Formula 1, at least one of R ¹ and R ² is preferably an alkyl group having a branched structure. Examples of the alkyl group having a branched structure include a 1-methylpentyl group, a 1-ethylpentyl group, a 1-butylpentyl group, and a 1-propylbutyl group. R ^1, and at least one of R ² is more preferably an alkyl group having a structure represented by the following formula 2, R ^1, and R ² is an alkyl group having a structure represented by the following formula 2 Is particularly preferable.

In formula 2, R ³ and R ⁴ each independently represent an alkyl group having 2 or more carbon atoms, and * represents a bond with another atom.

In Formula 2, R ^3, and the carbon number of one alkyl group R ⁴ is 2 or more, it is preferable R ^3, and the carbon number of the other alkyl group R ⁴ is 4 or more. Further, the carbon number of the alkyl group represented by R ³ and the carbon number of the alkyl group represented by R ⁴ are each independently preferably 8 or less, and more preferably 6 or less.

Examples of the dialkyl sulfosuccinate represented by the formula 1 include sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol sulfosuccinate, and the following compounds. .. In the compounds below, Et stands for "C ₂ H ₅ " and Bu stands for "C ₃ H ₇ ".

The water-containing composition may contain one type alone or two or more types of surfactants.

When the water-containing composition contains a surfactant, the content of the surfactant is preferably 0.01% by mass to 10% by mass, preferably 0.02% by mass, based on the total mass of the water-containing composition. It is more preferably% to 5% by mass, and particularly preferably 0.05% by mass to 3% by mass. When the content of the surfactant is 0.01% by mass or more, the surface tension of the water-containing composition can be easily adjusted to the above-mentioned range. When the content of the surfactant is 10% by mass or less, the amount of the surfactant remaining after the asphalt mixture is cured can be reduced. Therefore, it is possible to suppress foaming caused by water permeating the cured product of the asphalt mixture in rainy weather or the like.

-Organic solvent-
The water-containing composition preferably contains an organic solvent. When the water-containing composition contains an organic solvent, the surface tension of the water-containing composition can be adjusted.

Examples of the organic solvent include alcohol solvents (for example, methanol, ethanol, isopropanol, and diacetone alcohol) and alcohol ether solvents (for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol). Monoethyl ether, 3-methoxy-1-butanol, and 3-methoxy-3-methyl-1-butanol), ketone solvents (eg, acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone), ether solvents (eg, eg. Tetrahydrofuran and dioxane), ester solvents (eg, methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, and ethyl lactate), aromatic solvents (eg, benzene, toluene, etc.) And xylene), amide solvents (eg, formamide, and dimethylformamide), and hydrocarbon solvents (eg, n-hexane, cyclohexane, n-heptane, n-octane, and n-decane).

The water-containing composition may contain one kind alone or two or more kinds of organic solvents.

When the water-containing composition contains an organic solvent, the content of the organic solvent is preferably 1% by mass to 90% by mass, preferably 3% by mass to 80% by mass, based on the total mass of water. It is more preferably 5% by mass to 70% by mass, and particularly preferably 5% by mass to 30% by mass. When the content of the organic solvent is 1% by mass or more, the surface tension can be easily adjusted in a low range. When the content of the organic solvent is 90% by mass or less, the amount of water is not too small with respect to the amount of the organic solvent, so that the solidification of the asphalt mixture proceeds satisfactorily.

[Supply method]
The method of supplying water or a water-containing composition to the asphalt mixture is not limited. For example, a method of supplying water or a water-containing composition to an asphalt mixture arranged on a paved body can be mentioned. Specific examples of the supply method include a method of spraying water or a water-containing composition. The amount of water or water-containing composition supplied is not limited. The supply amount of water or the water-containing composition may be determined according to, for example, the amount of the asphalt mixture. Water, or the asphalt mixture supplied with the water-containing composition, may be mixed, if necessary.

The type of paved body is not limited. Examples of the paved body in road pavement include a layer called a roadbed and a layer called a roadbed. Materials contained in the pavement include, for example, sand, gravel, crushed stone, cement, and lime.

The method of placing the asphalt mixture on the pavement is not limited. As a method of arranging the asphalt mixture on the paved body, a known method can be used. For example, an asphalt finisher can be used to place the asphalt mixture on top of the pavement.

The temperature of the asphalt mixture upon contact with water or the water-containing composition is preferably 0 ° C to 100 ° C, more preferably 15 ° C to 100 ° C.

[Other processes]
The pavement method according to one aspect of the present disclosure may include various steps within the scope of the object of the present disclosure.

The pavement method according to certain embodiments may include leveling the water, or the asphalt mixture supplied with the water-containing composition. Specifically, the pavement method according to an embodiment may include supplying water or a water-containing composition to the asphalt mixture, then leveling the surface of the asphalt mixture and curing the asphalt mixture. By leveling the surface of the asphalt mixture, the flatness of the pavement can be improved.

The method of leveling the surface of the asphalt mixture is not limited. As a method for leveling the surface of the asphalt mixture, a known method can be used. Examples of leveling the surface of the asphalt mixture include a method using a known civil engineering machine (for example, a bulldozer).

The pavement method according to certain embodiments preferably comprises pressurizing water or an asphalt mixture supplied with the water-containing composition. In the technical field related to the present disclosure, pressurization of an asphalt mixture may be referred to, for example, "rolling compaction". Specifically, the pavement method according to a certain embodiment preferably includes supplying water or a water-containing composition to the asphalt mixture and then pressurizing the asphalt mixture to cure the asphalt mixture. Pressurization of the asphalt mixture can accelerate the hardening of the asphalt mixture. After leveling the water or the asphalt mixture supplied with the water-containing composition, the asphalt mixture may be pressurized.

The method of pressurizing the asphalt mixture is not limited. As a method for pressurizing the asphalt mixture, a known method can be used. Examples of the method of pressurizing the asphalt mixture include a method using a known civil engineering machine (for example, a road roller). When pressurizing the asphalt mixture, the asphalt mixture may be pressurized multiple times.

The pressure at which the asphalt mixture is pressurized is not limited. The pressure for pressurizing the asphalt mixture may be determined, for example, according to the construction area, the amount of the asphalt mixture, and the desired strength. The pressure at which the asphalt mixture is pressurized may be determined, for example, in the range of 0.1 MPa to 500 MPa.

The temperature of the asphalt mixture when pressurizing the asphalt mixture is preferably 0 ° C. to 100 ° C., more preferably 15 ° C. to 100 ° C.

The pavement method according to certain embodiments may cure water, or an asphalt mixture supplied with a water-containing composition. Specifically, the pavement method according to an embodiment may include supplying water or a water-containing composition to the asphalt mixture, curing the asphalt mixture, and curing the asphalt mixture. In the present disclosure, the aspect of "curing an asphalt mixture" includes protecting or allowing the asphalt mixture to stand. By curing the asphalt mixture, the curability of the asphalt mixture can be improved. Curing of the asphalt mixture is preferably carried out after leveling the asphalt mixture supplied with water or the water-containing composition, or after pressurizing the asphalt mixture supplied with water or the water-containing composition.

In the curing of the asphalt mixture, it is preferable to appropriately adjust the environment (for example, temperature, humidity, and time) of the asphalt mixture.

The temperature at which the asphalt mixture is cured is preferably 10 ° C to 40 ° C, more preferably 15 ° C to 25 ° C.

The humidity (relative humidity) when curing the asphalt mixture is preferably 0% to 90%, more preferably 0% to 70%.

The time for curing the asphalt mixture is preferably 1 hour to 72 hours, more preferably 3 hours to 24 hours.

According to the pavement method according to one aspect of the present disclosure, the surface of the paved body can be paved with a cured product (asphalt cured product) of the asphalt mixture, for example, by undergoing curing of the asphalt mixture. For example, the asphalt hardened product formed on the road surface can function as, for example, the surface layer of the road. The pavement method according to one aspect of the present disclosure may be applied to, for example, repair of asphalt pavement.

<Cured product (cured product of asphalt mixture)>
The cured product according to one aspect of the present disclosure is a cured product of the asphalt mixture according to one aspect of the present disclosure. According to the above aspect, a cured product of an asphalt mixture having excellent strength is provided.

The martial stability of the cured product according to one aspect of the present disclosure is preferably 2.5 kN or more, more preferably 2.9 kN or more, further preferably 3.5 kN or more, and 4.5 kN or more. The above is particularly preferable. In terms of strength, the upper limit of the Marshall stability of the cured product is not limited. When setting the upper limit of the martial stability of the cured product, the martial stability of the cured product may be determined, for example, in the range of 15 kN or less. In this disclosure, the Marshall stability is measured based on the "B001 Marshall Stability Test Method" described in the "Pavement Survey / Test Method Handbook" (Japan Road Association, 2018 edition). The value of martial stability shall be the average value of the values obtained by measuring three times under the condition of 60 ° C.

The cured product according to one aspect of the present disclosure can be obtained by curing the asphalt mixture according to one aspect of the present disclosure. The asphalt mixture applied as a raw material for the cured product according to one aspect of the present disclosure is synonymous with the asphalt mixture described in the above section "Asphalt mixture". The preferred embodiment of the asphalt mixture applied as the raw material of the cured product according to one aspect of the present disclosure is the same as the preferred embodiment of the asphalt mixture described in the above section "Asphalt mixture". As a method for curing the asphalt mixture, the method described in the above section "Pavement method" can be used.

Hereinafter, a preferred embodiment of the method for producing a cured product according to one aspect of the present disclosure will be described. According to the following aspects, a method for producing a cured product having excellent strength is provided. However, the method for producing a cured product according to one aspect of the present disclosure is not limited to the following contents. In certain embodiments, the method for producing the cured product preferably comprises using an asphalt mixture to obtain a cured product having a martial stability of 2.5 kN or higher. Specifically, in one embodiment, the method for producing a cured product is to pressurize a composite containing an asphalt mixture and water or a water-containing composition at a temperature of 100 ° C. or lower, and the martial stability is 2.5 kN. It is preferable to include obtaining the cured product as described above. In certain embodiments, the method for producing a cured product is to pressurize a composite containing an asphalt mixture and water, or a water-containing composition, at a temperature of 100 ° C. or lower, and 24 hours after pressurizing the composite. It is preferable to include obtaining a cured product having a Marshall stability of 2.5 kN or more. The "composite containing an asphalt mixture and water or a water-containing composition" can be obtained, for example, by supplying water or a water-containing composition to the asphalt mixture. The asphalt mixture may be supplied to water or a water-containing composition. The water applied to the method for producing a cured product is synonymous with the water described in the above section "Pavement method". The water-containing composition applied to the method for producing a cured product has the same meaning as the water-containing composition described in the above section "Pavement method". The preferred embodiment of the water-containing composition applied to the method for producing a cured product is the same as the preferred embodiment of the water-containing composition described in the above section "Pavement method". The pressure at which the composite is pressurized may be determined according to the desired Marshall stability. For the specific pressure range, the contents described in the above-mentioned "Pavement method" section can be referred to. For the method and conditions of each step in the above-mentioned manufacturing method, the contents described in the above-mentioned "paving method" section can be referred to. The method for producing a cured product according to one aspect of the present disclosure may include various steps described in the above section "Pavement method".

Since the cured product according to one aspect of the present disclosure has excellent strength, it can be used, for example, for construction of asphalt pavement and repair of asphalt pavement.

Hereinafter, the present disclosure will be described in detail by way of examples. However, the present disclosure is not limited to the following examples.

<Examples 1 to 39 and Comparative examples 1 to 3>
An asphalt mixture was prepared by mixing the asphalt-containing composition and the specific additive component according to the description in Table 1.

<Evaluation>
[Water penetration time]
The asphalt mixture was charged into a mold (ie, mold) having a diameter of 10.2 cm and a height of 7.8 cm. Using an asphalt compaction device (DB-17, Daiwa Kenko Co., Ltd.), both sides of the asphalt mixture in the mold were compacted 15 times each. A curing promoting component (50 g) selected according to the description in Table 1 was evenly added to the surface of the obtained molded product (diameter: 10.2 cm, height: 6.3 cm, shape: disk shape). The time from the addition of the curing accelerating component to the surface of the molded body until the curing accelerating component permeated into the molded body was visually measured. The measurement results are shown in Table 1.

[Marshall stability]
Both sides of the molded product to which the curing accelerating component was added by the method described in the above "water permeation time" are compacted 35 times each using an asphalt compacting device (DB-17, Daiwa Kenko Co., Ltd.). As a result, a test body (a cured product of the asphalt mixture) for the Marshall stability test was prepared. After curing the above test piece for 24 hours, a Marshall stability test was carried out according to the following method. The Marshall stability test was carried out based on the "B001 Marshall Stability Test Method" described in the "Pavement Survey / Test Method Handbook" (Japan Road Association, 2018 edition). The value of martial stability was taken as the average value of the values obtained by measuring three times under the condition of 60 ° C. The measurement results are shown in Table 1. The higher the value of martial stability, the higher the strength.

[Water drainage]
5 g of water was added to the center of the surface of the test piece cured by the method described in the above section "Marshall stability". The time (t) from the addition of water to the surface of the test piece until the water reached the edge of the test piece and flowed out from the side surface was measured. Water drainage was evaluated according to the following criteria. The smaller the time (t), the better the water drainage property.
A: t ≤ 30 seconds B: 30 seconds <t <2 minutes C: 2 minutes ≤ t

In Table 1, the terms shown below have the following meanings, respectively.
"Mild patch 13 mm product": Maeda Road Co., Ltd. "Mild patch (13 mm)" (mixture containing asphalt, aggregate, carboxylic acid compound, and alkaline compound)
"Sucrose": Nissin Sugar Co., Ltd.'s "Medium Zara Sugar" (water-soluble solid material)
"Sodium polyacrylate": Pellets (water-soluble solid material) prepared by the following molding method (1) using "Aqualic MH" of Nippon Shokubai Co., Ltd.
"Polyvinylpyrrolidone": Pellets (water-soluble solid material) prepared by the following molding method (1) using "K-85" of Nippon Shokubai Co., Ltd.
"Polyacrylamide": Toray Industries, Inc. "AQ Nylon A-90" (water-soluble solid material)
"Polyethylene oxide": Pellets (water-soluble solid material) prepared by the following molding method (1) using "PEO-3" of Sumitomo Seika Chemical Co., Ltd.
"Glass (φ6)"): "Glass beads (soda glass) φ6 mm" from AS ONE Corporation (hydrophilic solid material)
"Glass (φ3)"): "Glass beads (soda glass) φ3 mm" from AS ONE Corporation (hydrophilic solid material)
"Glass (φ1.2)": "Glass beads BZ-1" from AS ONE Corporation (hydrophilic solid material)
"SWG (0-5)": Recycled glass granulated sand "Sandwave G" from Toei Co., Ltd. (particle size type: 0 mm to 5 mm, hydrophilic solid material)
"SWG (5-10)": Toei Co., Ltd.'s recycled glass granulated sand "Sandwave G" (particle size type: 5 mm to 10 mm, hydrophilic solid material)
"Zirconia": Nikkato Corporation's "Zirconia Ball YTZ-3" (hydrophilic solid material)
"Silicon nitride": "Silicon nitride ball SUN-12 φ1" from Nikkato Corporation
"Aluminum": "Aluminum Sphere φ2mm" from AS ONE Corporation
"Polyvinyl alcohol": Pellets (hydrophilic solid material) prepared by the following molding method (1) using "Gosenex Z-220" of Mitsubishi Chemical Corporation.
"Polystyrene": "Pellet PS" of Shinei Kako Co., Ltd. (ClogP value of monomeric styrene: 2.95)
"Surfactant-containing water (1)": Fujifil Wako Pure Chemical Industries, Ltd. "Sodium = bis (3,3,4,4,5,5,6,6,6-nonafluoro) = 2-sulfonitoxy Composition containing "succinate" (surfactant) and water (solid content concentration: 0.1% by mass, surface tension at 20 ° C.: 17 mN / m)
"Surfactant-containing water (2)": A composition containing "bis (2-ethylhexyl) sulfosuccinate" (surfactant) from Fujifilm Wako Pure Chemical Industries, Ltd. and water (solid content concentration: 1. 2% by mass, surface tension at 20 ° C: 26 mN / m)
"Surfactant-containing water (3)": Kao Corporation's "Family Fresh" (composition containing water and surfactant, solid content concentration: 2% by mass, surface tension at 20 ° C.: 27 mN / m)

The chemical structure of sodium = bis (3,3,4,4,5,5,6,6,6-nonafluoro) = 2-sulfonitoxysuccinate is shown below.

[Molding method (1)]
Hereinafter, a method for producing pellets using "Aqualic MH", "K-85", "PEO-3", or "Gosenex Z-220" as a raw material will be described. Pellets were prepared by the following methods in an environment filled with a nitrogen stream. The raw materials were put into the hopper of the twin-screw kneading extruder, and kneaded and melted at 100 ° C. to 160 ° C. at a screw rotation speed of 300 rpm (revolutions per minute) and a residence time of 40 seconds. The obtained melt is passed through a filtration part consisting of a metal filter part having an average pore diameter of 30 μm and a metal filter part having an average pore diameter of 10 μm, and then the diameter of the extruded part is 3 mm from a nozzle having a diameter of 2.5 mm. Extruded into strands at 200 kg / hour. The melt extruded from the nozzle was placed on a belt conveyor and cooled by air cooling or blowing air until the temperature became 45 ° C. or lower. The solidified product was cut to obtain pellets.

The average particle size shown in Table 1 is a value measured by the method described above.

According to the results shown in Table 1, it was found that Marshall stability was high in Examples 1 to 39. On the other hand, in Comparative Examples 1 to 3, the water or the water-containing composition did not permeate the asphalt mixture, and the martial stability could not be measured due to insufficient curing. The above results indicate that superior strength was exhibited in Examples 1 to 39 as compared with Comparative Examples 1 to 3.

The same effect can be obtained by replacing the "mild patch 13 mm product" with the prepared asphalt, aggregate, carboxylic acid compound, and alkaline compound in the above-mentioned examples.

Claims (14)

Asphalt and
Aggregate and
At least one selected from the group consisting of an aliphatic carboxylic acid and an aliphatic carboxylic acid ester, and
Alkaline compounds and
At least one selected from the group consisting of a water-soluble solid material that is solid under an environment of 25 ° C. and standard atmosphere, and a hydrophilic solid material that is solid under an environment of 25 ° C. and standard atmosphere .
Asphalt mixture containing. The asphalt according to claim 1, wherein the water-soluble solid material contains at least one selected from the group consisting of sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polyethylene oxide, and polysaccharides. blend. The asphalt mixture according to claim 1 or 2, wherein the hydrophilic solid material contains at least one selected from the group consisting of polyvinyl alcohol, polyacrylic acid, metal oxides, metal nitrides, and metals. The asphalt mixture according to any one of claims 1 to 3, wherein the water-soluble solid material has an average particle size of 0.3 mm or more. The asphalt mixture according to any one of claims 1 to 4, wherein the hydrophilic solid material has an average particle size of 0.3 mm or more. The method according to any one of claims 1 to 5, wherein the total content of the water-soluble solid material and the hydrophilic solid material is 5% by volume to 20% by volume with respect to the total volume of the asphalt mixture. Asphalt mixture. A pavement method comprising supplying water or a water-containing composition to the asphalt mixture according to any one of claims 1 to 6 and curing the asphalt mixture. The pavement method according to claim 7, wherein the surface tension of the water-containing composition at 20 ° C. is 50 mN / m or less. The pavement method according to claim 7, wherein the surface tension of the water-containing composition at 20 ° C. is 25 mN / m or less. The pavement method according to any one of claims 7 to 9, wherein the water-containing composition contains a surfactant. The pavement method according to claim 10, wherein the surfactant contains an anionic surfactant. The 10th or 11th claim, wherein the surfactant comprises at least one selected from the group consisting of an ionic surfactant having a sulfonic acid group and an ionic surfactant having a sulfonic acid base. Pavement method. The cured product of the asphalt mixture according to any one of claims 1 to 6. A composite containing the asphalt mixture and water or a water-containing composition is pressurized at a temperature of 100 ° C. or lower, and the Marshall stability 24 hours after the pressurization of the composite is 2.5 kN or more. Including getting things
The asphalt mixture is solid with at least one selected from the group consisting of asphalt, aggregate, aliphatic carboxylic acid and aliphatic carboxylic acid ester, an alkaline compound, and an environment of 25 ° C. and standard atmospheric pressure. A method for producing a cured product, which comprises at least one selected from the group consisting of a water-soluble solid material and a hydrophilic solid material which is solid under an environment of 25 ° C. and standard atmospheric pressure .