Method for manufacturing asphalt mixture molding

Abstract

To provide a method for manufacturing an asphalt mixture molding which maintains workability even when an asphalt mixture containing a polyester resin is compacted at low temperature, and is excellent in durability.SOLUTION: A method for manufacturing an asphalt mixture molding includes a step of compacting an asphalt mixture containing asphalt, an aggregate, a polyester resin and the following compound (A) at 145°C or lower. Compound (A): (i) a compound having an aliphatic hydrocarbon group having 8 or more and 22 or less carbon atoms or an aryl group and two or more hydroxy groups, (ii) a compound having an aliphatic hydrocarbon group having 8 or more and 22 or less carbon atoms or an aryl group, an oxyalkylene group and two or more hydroxy groups, (iii) a compound having an aliphatic hydrocarbon group having 8 or more and 22 or less carbon atoms or an aryl group and an oxyalkylene group, and (iv) one or more compounds selected from the group consisting of polyalkylene glycol.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for manufacturing an asphalt mixture molded body and a paving method.

Background Art

[0002] For paving roads such as motorways, parking lots, cargo yards, and sidewalks, asphalt paving using an asphalt mixture is carried out because it is relatively easy to lay and the time from the start of paving work to the start of traffic can be shortened. Since this asphalt paving forms a road surface with an asphalt mixture in which aggregates are bound with asphalt, the paved road has good hardness and durability.

[0003] Patent Document 1 discloses an asphalt modifier capable of achieving both a deep texture on the surface of the constructed paving body and high density inside the paving body, which contains a structural unit derived from an alcohol component and a structural unit derived from a carboxylic acid component, the alcohol component contains an alcohol having a bisphenol structure, and the carboxylic acid component contains a polyester containing a monovalent carboxylic acid. Patent Document 2 discloses an asphalt modifier for obtaining an asphalt mixture capable of achieving both the filling efficiency of an asphalt composite material and the strength of asphalt paving, which contains a structural unit derived from a monovalent aliphatic carboxylic acid and / or a structural unit derived from a monovalent aliphatic alcohol crystalline polyester (A).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] From the perspective of recent environmental load reduction and soaring crude oil prices, efforts have been made to reduce fuel during the production of heated asphalt mixtures and to perform kneading at a lower temperature compared to the conventional process, which is called medium-temperature conversion. On the other hand, in the production of asphalt added with polymers such as thermoplastic resins and elastomers, thickening or elasticization of these polymers may induce construction defects and insufficient strength. In the technologies described in Patent Document 1 and Patent Document 2, when the compacting temperature of the asphalt mixture containing a polyester resin is set to a medium temperature, which is a lower temperature, the compacting property becomes insufficient, and the workability may be inferior.

[0006] The present invention relates to a method for manufacturing an asphalt mixture molded body and a paving method that maintain workability even when an asphalt mixture containing a polyester resin is compacted at a low temperature and have excellent durability.

Means for Solving the Problems

[0007] The present invention relates to the following [1] to [2]. [1] A method for manufacturing an asphalt mixture molded body, comprising a step of compacting an asphalt mixture containing asphalt, aggregate, a polyester resin, and the following compound (A) at 145°C or lower. Compound (A): (i) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups, (ii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group, and (iv) Polyalkylene glycol One or more compounds selected from the group consisting of [2] A paving method comprising a step of compacting and constructing an asphalt mixture containing asphalt, aggregate, a polyester resin, and the following compound (A) on a paving target, A paving method in which the compaction temperature is 145°C or lower. Compound (A): (i) A compound having an aliphatic hydrocarbon group or aryl group with 8 to 22 carbon atoms and two or more hydroxy groups, (ii) A compound having an aliphatic hydrocarbon group or aryl group with 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) A compound having an aliphatic hydrocarbon group or aryl group with 8 to 22 carbon atoms and an oxyalkylene group, and (iv) Polyalkylene glycol One or more compounds selected from the group consisting of

Advantages of the Invention

[0008] According to the present invention, even when an asphalt mixture containing a polyester resin is compacted at a low temperature, workability can be maintained, and a method for manufacturing an asphalt mixture molded body and a paving method excellent in durability can be provided.

Embodiments for Carrying Out the Invention

[0009] [Method for Manufacturing Asphalt Mixture Molded Body] The method for manufacturing an asphalt mixture molded body of the present invention includes a step of compacting an asphalt mixture containing asphalt, aggregate, a polyester resin, and the following compound (A) at 145°C or lower. Compound (A): (i) A compound having an aliphatic hydrocarbon group or aryl group with 8 to 22 carbon atoms and two or more hydroxy groups, (ii) A compound having an aliphatic hydrocarbon group or aryl group with 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) A compound having an aliphatic hydrocarbon group or aryl group with 8 to 22 carbon atoms and an oxyalkylene group, and (iv) Polyalkylene glycol One or more compounds selected from the group consisting of

[0010] According to the present invention, it is possible to provide a method for manufacturing an asphalt mixture molded body having excellent durability while maintaining workability even when an asphalt mixture containing a polyester resin is compacted at a low temperature.

[0011] An asphalt mixture molded body having excellent durability has, for example, a small rutting amount measured by a wheel tracking test. An asphalt mixture having excellent workability has a small void ratio of the obtained asphalt pavement and excellent compactability.

[0012] Although the detailed mechanism by which the effects of the present invention are obtained is unknown, it is considered in part as follows. It is considered that when the asphalt mixture contains a specific compound, asphaltene, which is a highly viscoelastic component in asphalt, is finely dispersed, thereby lowering the viscoelasticity of the asphalt and achieving excellent compactability. In addition, it is considered that polyester, which has higher viscoelasticity than asphalt, is also finely dispersed in the asphalt, and the influence of the high viscoelasticity of the polyester is suppressed.

[0013] <Asphalt mixture> The asphalt mixture contains asphalt, aggregate, polyester resin, and the above compound (A). Hereinafter, each component of asphalt, aggregate, polyester resin, and the above compound (A) will be described.

[0014] (Asphalt) Asphalt, various types of asphalt can be used. For example, in addition to straight asphalt which is paving petroleum asphalt, modified asphalt can be mentioned. Examples of modified asphalt include blown asphalt; polymer-modified asphalt modified with polymer materials such as thermoplastic elastomers and thermoplastic resins. Straight asphalt refers to the residual asphalt substance obtained by subjecting crude oil to an atmospheric distillation unit, a vacuum distillation unit, etc. Also, blown asphalt means asphalt obtained by heating a mixture of straight asphalt and heavy oil and then blowing air into it for oxidation. The asphalt is preferably selected from straight asphalt and polymer-modified asphalt. From the perspective of the durability of the asphalt mixture molded body, polymer-modified asphalt is more preferable, and from the perspective of versatility, straight asphalt is more preferable. As the polymer-modified asphalt, asphalt modified with a thermoplastic elastomer is more preferable. The modified asphalt is preferably polymer-modified asphalt, and more preferably polymer-modified asphalt modified with a thermoplastic elastomer.

[0015] · Thermoplastic elastomer Examples of the thermoplastic elastomer in the polymer-modified asphalt modified with a thermoplastic elastomer include, for example, styrene / butadiene block copolymer, styrene / butadiene / styrene block copolymer, styrene / butadiene random copolymer, styrene / isoprene block copolymer, styrene / isoprene / styrene block copolymer, styrene / isoprene random copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic ester copolymer, styrene / ethylene / butylene / styrene copolymer, styrene / ethylene / propylene / styrene copolymer, polyurethane-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, isobutylene / isoprene copolymer, polyisoprene, polychloroprene, synthetic rubbers other than the above, and at least one selected from natural rubbers. The thermoplastic elastomer in the modified asphalt is preferably at least one selected from styrene / butadiene block copolymer, styrene / butadiene / styrene block copolymer, styrene / butadiene random copolymer, styrene / isoprene block copolymer, styrene / isoprene / styrene block copolymer, styrene / isoprene random copolymer, ethylene / vinyl acetate copolymer, and ethylene / acrylic ester copolymer. Among these, as the thermoplastic elastomer, from the viewpoint of the durability of the asphalt mixture molded body, preferably at least one selected from styrene / butadiene block copolymer, styrene / butadiene / styrene block copolymer, styrene / butadiene random copolymer, styrene / isoprene block copolymer, styrene / isoprene / styrene block copolymer, styrene / isoprene random copolymer, and ethylene / acrylic ester copolymer; more preferably at least one selected from styrene / butadiene block copolymer, styrene / butadiene / styrene block copolymer, styrene / butadiene random copolymer, styrene / isoprene block copolymer, and styrene / isoprene random copolymer; still more preferably at least one selected from styrene / butadiene random copolymer and styrene / butadiene / styrene block copolymer. From the perspective of the durability of the asphalt mixture molded body, the content of the thermoplastic elastomer in the polymer-modified asphalt is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.5% by mass or more, still more preferably 1% by mass or more, and more preferably 20% by mass or less, still more preferably 10% by mass or less.

[0016] (Aggregate) The asphalt mixture in the present invention can contain aggregates. As specific aggregates, for example, crushed stones, cobblestones, gravel, sand, ceramics, etc. can be arbitrarily selected and used. Further, as aggregates, coarse aggregates having a particle size of 2.36 mm or more, fine aggregates having a particle size of 0.075 mm or more and less than 2.36 mm, and fillers having a particle size of less than 0.075 mm can be used.

[0017] Examples of the coarse aggregates include crushed stones having a particle size range of 2.36 mm or more and less than 4.75 mm, crushed stones having a particle size range of 4.75 mm or more and less than 12.5 mm, crushed stones having a particle size range of 12.5 mm or more and less than 19 mm, and crushed stones having a particle size range of 19 mm or more and less than 31.5 mm. Examples of the fine aggregates include river sand, hill sand, mountain sand, sea sand, crushed sand, fine sand, screenings, crushed stone dust, silica sand, artificial sand, glass cullet, and foundry sand. The particle sizes of the coarse aggregates and the fine aggregates are values based on the sieving test method defined in JIS A5001:2008. Examples of the fillers include sand, fly ash, calcium carbonate powder such as limestone powder, and slaked lime. Among these, calcium carbonate powder is preferable from the perspective of the durability of the asphalt mixture molded body. From the perspective of improving the strength of the asphalt mixture molded body, the average particle size of the filler is preferably 0.001 mm or more, and preferably 0.05 mm or less, more preferably 0.03 mm or less, still more preferably 0.02 mm or less. Here, the average particle size means the average particle size (D 50 ) at 50% volume cumulative, and can be measured by a laser diffraction particle size distribution measuring device.

[0018] As aggregates, it is preferable to use coarse aggregates and fine aggregates in combination. In this case, the mass ratio of the coarse aggregate to the fine aggregate (coarse aggregate / fine aggregate) is preferably 10 / 90 or more and 90 / 10 or less, more preferably 15 / 85 or more, still more preferably 20 / 80 or more, and more preferably 80 / 20 or less, still more preferably 70 / 30 or less, from the viewpoint of the durability of the asphalt mixture compact.

[0019] The asphalt mixture in the present invention can contain asphalt recycled aggregate as an aggregate. The aggregate may not contain virgin aggregate and may be composed only of asphalt recycled aggregate. Asphalt recycled aggregate is obtained by collecting used asphalt pavement, crushing and classifying it. The used asphalt pavement from which the asphalt recycled aggregate is derived contains asphalt and aggregate, and can contain other additives as necessary.

[0020] Note that the asphalt contained in the asphalt recycled aggregate has deteriorated in physical and chemical properties compared to virgin asphalt due to the influence of environmental factors such as heat and light. The physical and chemical properties of asphalt can be evaluated by measuring the penetration, softening point, bending strength, strain at break, asphalt composition, etc. of the asphalt. Generally, asphalt in which the maltene fraction in the asphalt has migrated to asphaltene and the penetration has decreased is often called deteriorated asphalt. However, even if the penetration of the recycled asphalt is equivalent to that of the virgin asphalt, there are cases where it cannot exhibit the same performance as the virgin asphalt due to changes in other properties.

[0021] The asphalt mixture derived from the used asphalt pavement contains aggregates. Examples of such aggregates include aggregates commonly used in asphalt mixtures for road paving, such as crushed stone, cobblestone, gravel, sand, ceramics, etc. Further, the asphalt mixture itself derived from the used asphalt pavement may use asphalt recycled aggregate as an aggregate.

[0022] (Polyester resin) The polyester resin contained in the asphalt mixture in the present invention is a polycondensate of an alcohol component and a carboxylic acid component, including a structural unit derived from the alcohol component and a structural unit derived from the carboxylic acid component. Examples of the polyester resin include an amorphous polyester resin and a crystalline polyester resin, and preferably an amorphous polyester resin. Hereinafter, the physical properties of the alcohol component, the carboxylic acid component, and the polyester resin will be described.

[0023] · Alcohol component Examples of the alcohol component include chain aliphatic diols, alicyclic diols, aromatic diols, polyhydric alcohols having a valence of 3 or more, etc. These alcohol components can be used alone or in combination of two or more.

[0024] The chain aliphatic diol is preferably a straight-chain or branched-chain aliphatic diol having 2 or more and 12 or less carbon atoms in the main chain, and more preferably a straight-chain or branched-chain aliphatic diol having 2 or more and 8 or less carbon atoms in the main chain. Further, the chain aliphatic diol is preferably a saturated chain aliphatic diol. Specific examples of the chain aliphatic diol include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,4-butenediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 1,10-decanediol, 1,12-dodecanediol.

[0025] Examples of the alicyclic diol include hydrogenated bisphenol A (2,2-bis(4-hydroxycyclohexyl)propane), an alkylene oxide adduct of hydrogenated bisphenol A, cyclohexanediol, and cyclohexanedimethanol.

[0026] Examples of the aromatic diol include bisphenol A (2,2-bis(4-hydroxyphenyl)propane) and an alkylene oxide adduct of bisphenol A. Examples of the alkylene oxide adduct of bisphenol A include an alkylene oxide adduct of bisphenol A represented by the following formula (I).

[0027] [Chemical formula]

[0028] [In the formula, OR 1 and R 1 O is an alkylene oxide, R 1 is an alkylene group having 2 or 3 carbon atoms, x and y represent positive numbers indicating the average number of moles of alkylene oxide added, the sum of x and y is preferably 1 or more, more preferably 1.5 or more, and is preferably 16 or less, more preferably 8 or less, and still more preferably 4 or less.]

[0029] Examples of the alkylene oxide adduct of bisphenol A represented by the formula (I) include a propylene oxide adduct of bisphenol A and an ethylene oxide adduct of bisphenol A. These alkylene oxide adducts of bisphenol A can be used alone or in combination of two or more.

[0030] The polyhydric alcohol having a valence of 3 or more is preferably a trihydric alcohol. Examples of the polyhydric alcohol having a valence of 3 or more include glycerin, pentaerythritol, trimethylolpropane, and sorbitol.

[0031] From the perspective of physical property adjustment, the alcohol component can further contain a monohydric aliphatic alcohol. Examples of the monohydric aliphatic alcohol include lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol, and the like. These monohydric aliphatic alcohols can be used alone or in combination of two or more.

[0032] · Carboxylic acid component Examples of the carboxylic acid component include aliphatic dicarboxylic acids, aromatic dicarboxylic acids, and polycarboxylic acids having a valence of 3 or more and 6 or less. These carboxylic acid components can be used alone or in combination of two or more.

[0033] Examples of the aliphatic dicarboxylic acid include aliphatic dicarboxylic acids having a main chain carbon number of preferably 4 or more, and preferably 10 or less, more preferably 8 or less, still more preferably 6 or less. Specifically, for example, fumaric acid, maleic acid, oxalic acid, malonic acid, citraconic acid, itaconic acid, glutaconic acid, succinic acid, adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, or anhydrides thereof, and alkyl esters thereof (for example, the alkyl group having 1 to 3 carbon atoms). Examples of the substituted succinic acid include dodecyl succinic acid, dodecenyl succinic acid, and octenyl succinic acid. The succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, or anhydrides thereof can be produced, for example, according to the description in JP-A-2008-145712. Commercially available products can also be used.

[0034] Examples of the aromatic dicarboxylic acid include phthalic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, or their anhydrides, and their alkyl esters (e.g., the alkyl group has 1 to 3 carbon atoms). Among the above aromatic dicarboxylic acids, from the viewpoint of durability, isophthalic acid and terephthalic acid are preferred, and terephthalic acid is more preferred.

[0035] The polyvalent carboxylic acid having 3 to 6 valences is preferably a trivalent carboxylic acid. Examples of the polyvalent carboxylic acid having 3 to 6 valences include trimellitic acid, 2,5,7-naphthalenetricarboxylic acid, pyromellitic acid, or their acid anhydrides.

[0036] From the viewpoint of physical property adjustment, the carboxylic acid component may further contain a monovalent aliphatic carboxylic acid. Examples of the monovalent aliphatic carboxylic acid include monovalent aliphatic carboxylic acids having 12 to 20 carbon atoms such as lauric acid, myristic acid, palmitic acid, stearic acid, and their alkyl (having 1 to 3 carbon atoms) esters of these acids. These monovalent aliphatic carboxylic acids can be used alone or in combination of two or more.

[0037] · Structural unit derived from polyethylene terephthalate The polyester resin can contain a structural unit derived from ethylene glycol and a structural unit derived from terephthalic acid, which are derived from polyethylene terephthalate. Polyethylene terephthalate may contain a small amount of components such as butanediol and isophthalic acid in addition to the structural units derived from ethylene glycol and terephthalic acid. Polyethylene terephthalate is preferably recycled polyethylene terephthalate. When the polyester resin contains a structural unit composed of ethylene glycol and terephthalic acid derived from polyethylene terephthalate, the "structural unit derived from the alcohol component" includes the structural unit derived from ethylene glycol derived from polyethylene terephthalate, and the "structural unit derived from the carboxylic acid component" includes the structural unit derived from terephthalic acid derived from polyethylene terephthalate.

[0038] · Preferred embodiments of the polyester resin In a preferred embodiment of the polyester resin, from the viewpoint of ensuring compatibility with asphaltenes in asphalt, the content of terephthalic acid in 100 mol% of the carboxylic acid component is preferably 20 mol% or more, more preferably 40 mol% or more, still more preferably 60 mol% or more, and preferably 100 mol% or less. Note that the terephthalic acid may be terephthalic acid derived from polyethylene terephthalate. Further, in a preferred embodiment of the polyester resin, from the viewpoint of interacting with asphaltenes in asphalt to further improve durability, the content of the alkylene oxide adduct of bisphenol A in 100 mol% of the alcohol component is preferably 10 mol% or more, more preferably 20 mol% or more, still more preferably 30 mol% or more, and preferably 100 mol% or less.

[0039] (Physical properties of the polyester resin) The softening point of the polyester resin is preferably 80°C or higher and 140°C or lower, more preferably 85°C or higher, still more preferably 90°C or higher, and more preferably 130°C or lower, still more preferably 120°C or lower, still more preferably 115°C or lower, from the viewpoint of the durability of the asphalt mixture molded body. The weight average molecular weight Mw of the polyester resin is preferably 5000 or more and 70000 or less, more preferably 7000 or more, still more preferably 8000 or more, and more preferably 40000 or less, still more preferably 25000 or less, from the same viewpoint. The acid value of the polyester is preferably 1 mgKOH / g or more and 60 mgKOH / g or less, more preferably 3 mgKOH / g or more, still more preferably 5 mgKOH / g or more, from the viewpoint of the durability of the asphalt mixture molded body, and more preferably 30 mgKOH / g or less, still more preferably 10 mgKOH / g or less, from the viewpoint of enhancing the water resistance of the pavement surface. From the perspective of the durability of the asphalt mixture molded body, the hydroxyl value of the polyester is preferably 1 mgKOH / g or more and 50 mgKOH / g or less, more preferably 10 mgKOH / g or more, still more preferably 20 mgKOH / g or more, and more preferably 45 mgKOH / g or less, still more preferably 40 mgKOH / g or less.

[0040] The softening point, weight average molecular weight Mw, acid value, and hydroxyl value of the polyester resin can be measured by the methods described in the examples. The softening point, weight average molecular weight Mw, acid value, and hydroxyl value can be adjusted by the raw material monomer composition, molecular weight, catalyst amount, or reaction conditions.

[0041] The polyester resin may be a polyester resin modified to such an extent that its properties are not substantially impaired. Specifically, modified polyester resins include polyester resins grafted or blocked with phenol, urethane, epoxy, etc. by the methods described in JP-A-11-133668, JP-A-10-239903, JP-A-8-20636, etc. Preferred modified polyester resins include urethane-modified polyester resins obtained by extending the polyester resin with a polyisocyanate compound.

[0042] · Method for producing polyester resin The method for producing the polyester resin contained in the modified asphalt mixture in the present invention can be produced, for example, by polycondensing the above-described alcohol component and carboxylic acid component. From the perspective of adjusting the reactivity and the durability of the asphalt mixture molded body, the temperature of the polycondensation reaction is preferably 160°C or more and 260°C or less, more preferably 190°C or more, still more preferably 200°C or more, and more preferably 250°C or less, still more preferably 240°C or less.

[0043] When the polyester resin used in the present invention contains a structural unit derived from ethylene glycol derived from polyethylene terephthalate and a structural unit derived from terephthalic acid derived from polyethylene terephthalate, the abundance of polyethylene terephthalate in its raw materials is preferably 5% by mass or more and 80% by mass or less, more preferably 15% by mass or more, still more preferably 25% by mass or more, and more preferably 70% by mass or less, still more preferably 60% by mass or less in the total amount of polyethylene terephthalate, alcohol component and carboxylic acid component. By adding polyethylene terephthalate during the polycondensation reaction between the alcohol component and the carboxylic acid component, a transesterification reaction occurs, and a polyester resin in which the structural units of polyethylene terephthalate are incorporated into the structural units derived from the alcohol component and the structural units derived from the carboxylic acid component can be obtained. Polyethylene terephthalate may be present from the start of the polycondensation reaction or added to the reaction system during the polycondensation reaction. From the viewpoint of the durability of the asphalt mixture molded body, the addition timing of polyethylene terephthalate is preferably at a stage where the reaction rate between the alcohol component and the carboxylic acid component is 10% or less, and more preferably 5% or less. The reaction rate refers to the value of the amount of water generated in the production reaction (mol) / theoretical amount of water generated (mol)×100.

[0044] From the viewpoint of the reaction rate, an esterification catalyst can be used in the polycondensation reaction. Examples of the esterification catalyst include tin(II) compounds having no Sn-C bond such as tin(II) bis(2-ethylhexanoate). The amount of the esterification catalyst used is preferably 0.01 part by mass or more and 1.5 parts by mass or less, more preferably 0.1 part by mass or more, still more preferably 0.2 part by mass or more, and more preferably 1.0 part by mass or less, still more preferably 0.6 part by mass or less with respect to 100 parts by mass of the total amount of the alcohol component and the carboxylic acid component from the viewpoint of the reaction rate. In the polycondensation reaction, a cocatalyst can be used in addition to the esterification catalyst. Examples of the cocatalyst include pyrogallol compounds such as gallic acid. The amount of the cocatalyst used is preferably 0.001 parts by mass or more and 0.15 parts by mass or less, more preferably 0.005 parts by mass or more, still more preferably 0.01 parts by mass or more, and preferably 0.10 parts by mass or less, still more preferably 0.05 parts by mass or less, based on 100 parts by mass of the total amount of the alcohol component and the carboxylic acid component.

[0045] (Compound (A)) The asphalt mixture according to the present invention contains, as the compound (A), (i) a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups, (ii) a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group, and (iv) a polyalkylene glycol and contains one or more compounds selected from the group consisting of. The compound (A) can be used alone or in combination of two or more. The compound (A) is preferably a nonionic surfactant.

[0046] (i) a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups The aliphatic hydrocarbon group in the compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups (hereinafter also referred to as compound (i)) may be either a saturated aliphatic hydrocarbon group or a branched aliphatic hydrocarbon group, and is preferably a saturated aliphatic hydrocarbon group, that is, an alkyl group. Further, the above aliphatic hydrocarbon group may be either a linear aliphatic hydrocarbon group or a branched aliphatic hydrocarbon group. The number of carbon atoms in the above aliphatic hydrocarbon group is 8 or more and 22 or less, and from the viewpoint of the effects of the present invention, it is preferably 10 or more, more preferably 12 or more, still more preferably 14 or more, and preferably 20 or less.

[0047] The number of carbon atoms in the aryl group in the compound (i) is preferably 6 or more and 30 or less, more preferably 10 or more, and more preferably 25 or less. Examples of the aryl group include a phenyl group, an alkylphenyl group, a (poly)styrenated phenyl group, a (poly)benzylphenyl group, a tolyl group, a xylyl group, etc., and more preferably a (poly)styrenated phenyl group.

[0048] The compound (i) has two or more hydroxy groups. The number of hydroxy groups is 2 or more, preferably 5 or less, and more preferably 2, 3 or 4.

[0049] Preferred structures of the compound (i) include those in which an aliphatic hydrocarbon group or aryl group having 8 or more and 22 or less carbon atoms is bonded to a polyhydric alcohol compound having two or more hydroxy groups in the molecule via an ester bond, an ether bond, etc. Examples of the polyhydric alcohol compound include glycols, sugar alcohols, polysaccharides, and other polyhydric alcohol compounds, and more specifically, glycerol, pentaerythritol, trimethylolpropane, sorbitan, sorbitol, xylitol, maltitol, glycogen, cellulose, etc.

[0050] Specific examples of the compound (i) include glycerol alkyl ether, glycerol alkyl ester, sorbitan alkyl ether, sorbitan alkyl ester, etc., and more specifically, glycerol monooleate, sorbitan monostearate, etc. Commercially available products of the compound (i) include "Leodol MO-50", "Leodol AS-10V", etc. (the above are manufactured by Kao Corporation).

[0051] (ii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups Preferred embodiments of the aliphatic hydrocarbon group, aryl group, and hydroxy group in the compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups (hereinafter also referred to as compound (ii)) are the same as those of compound (i). Note that the compounds corresponding to compound (ii) are not included in compound (i).

[0052] Examples of the oxyalkylene group include an oxyethylene group (ethylene oxide group), an oxypropylene group (propylene oxide group), and the like. Among the oxyalkylene groups, a polyoxyalkylene group having a plurality of oxyalkylene groups added is preferred, and among them, a polyoxyalkylene group obtained by addition polymerization of a plurality of oxyalkylene groups is preferred. The average number of added moles of the polyoxyalkylene group is preferably 2 or more and 1000 or less, more preferably 5 or more, and still more preferably 500 or less. The oxyalkylene group constituting the polyoxyalkylene group may be any one kind alone or a combination of two or more kinds.

[0053] Preferred structures of compound (ii) include a structure in which an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms is bonded to a polyhydric alcohol compound having two or more hydroxy groups in the molecule via an ester bond, an ether bond, or the like, and an oxyalkylene group is bonded via an ether bond. Preferred embodiments of the polyhydric alcohol compound are the same as those of compound (i).

[0054] Specific examples of compound (ii) include polyethylene glycol glycerol alkyl ether, polyethylene glycol glycerol alkyl ester, polyethylene glycol sorbitan alkyl ether, polyethylene glycol sorbitan alkyl ester, etc. More specifically, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monolaurate, etc. can be mentioned. Commercially available products of compound (ii) include "Leodol TW-S120", "Leodol TW-L120", etc. (the above are manufactured by Kao Corporation).

[0055] (iii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group (hereinafter also referred to as compound (iii)) has a structure in which a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group are polymerized. Specifically, an aliphatic hydrocarbon group having 8 to 22 carbon atoms and an oxyalkylene group are bonded via an ether bond, an ester bond, a nitrogen atom, etc. Note that the compounds corresponding to compound (iii) are not included in compound (i) and compound (ii).

[0056] The above aliphatic hydrocarbon group and aryl group are the same as those of compound (i) above, and the preferred ranges are also the same. Examples of the oxyalkylene group include an oxyethylene group (ethylene oxide group), an oxypropylene group (propylene oxide group), etc. Among the oxyalkylene groups, a polyoxyalkylene group to which a plurality of oxyalkylene groups are added is preferred, and among them, a polyoxyalkylene group obtained by addition polymerization of a plurality of oxyalkylene groups is preferred. The average number of added moles of the polyoxyalkylene group is preferably 2 or more and 1000 or less, more preferably 5 or more, and still more preferably 500 or less. The oxyalkylene groups that make up the polyoxyalkylene group may be any one of them alone or in combination of two or more kinds.

[0057] Compound (iii) can have one or more hydroxy groups. The number of hydroxy groups is, for example, 1 or more and 5 or less, more preferably 1, 2, 3 or 4.

[0058] Specific examples of compound (iii) include polyethylene glycol alkylamine, polyethylene glycol alkyl ether, polyethylene glycol alkyl ester, etc. More specifically, polyoxyethylene stearyl ether, polyoxyethylene lauryl ether, polyoxyethylene (mono-, di-, tri-) styrenated phenyl ether, polyethylene glycol monostearate, etc. can be mentioned. Commercially available products of compound (iii) include "Amite 302", "Amite 308", "Amite 320", "Emulgen 320", "Emulgen 350", "Emulgen 123P", "Emulgen A-60", "Emanon 3199V" (manufactured by Kao Corporation).

[0059] (iv) Polyalkylene glycol Polyalkylene glycol is a polyether compound obtained by polymerizing alkylene glycols such as ethylene glycol and propylene glycol. That is, it is a compound having a structure in which two or more oxyalkylene groups are addition-polymerized.

[0060] The weight average molecular weight of compound (iv) is preferably 100 or more and 1,000,000 or less, more preferably 500 or more, still more preferably 1000 or more, and more preferably 100,000 or less, still more preferably 10,000 or less.

[0061] Examples of polyalkylene glycol include polyethylene glycol and polypropylene glycol. Commercially available products of polyalkylene glycol include "KPEG6000" (manufactured by Kao Corporation).

[0062] (Content of each component) From the perspective of durability, the content of asphalt in the asphalt mixture is preferably 1% by mass or more and 20% by mass or less, more preferably 3% by mass or more, still more preferably 4% by mass or more, and more preferably 15% by mass or less, still more preferably 10% by mass or less.

[0063] From the perspective of durability, the content of aggregate in the asphalt mixture is preferably 50% by mass or more and 99% by mass or less, more preferably 75% by mass or more, still more preferably 80% by mass or more, and more preferably 98% by mass or less, still more preferably 96% by mass or less.

[0064] Preferred examples of the aggregate formulation in the asphalt mixture include the following (1) to (3). (1) Fine-grained asphalt containing 30% by volume or more and less than 45% by volume of coarse aggregate, 30% by volume or more and 50% by volume or less of fine aggregate, and 5% by volume or more and 10% by volume or less of asphalt composition. (2) An example of the asphalt mixture is, for example, dense-grained asphalt containing 45% by volume or more and less than 70% by volume of coarse aggregate, 20% by volume or more and 45% by volume or less of fine aggregate, and 3% by volume or more and 10% by volume or less of asphalt composition. (3) Porous asphalt containing 70% by volume or more and 80% by volume or less of coarse aggregate, 10% by volume or more and 20% by volume or less of fine aggregate, and 3% by volume or more and 10% by volume or less of asphalt composition. Regarding the mixing ratio of asphalt in the conventional asphalt mixture containing aggregate and asphalt, it is usually used according to the optimum asphalt amount obtained from the "Mix Design of Asphalt Composition" described in the "Pavement Design and Construction Guidelines" issued by the Japan Road Association, a public interest incorporated association. In the present invention, the above optimum asphalt amount corresponds to the total amount of asphalt and asphalt modifier. However, it is not necessary to be limited to the method described in the "Pavement Design and Construction Guidelines", and it may be determined by other methods.

[0065] In the asphalt mixture of the present invention, the content of the polyester resin, from the viewpoint of the durability of the asphalt mixture molded body, is preferably 3 parts by mass or more, more preferably 5 parts by mass or more, still more preferably 7 parts by mass or more, based on 100 parts by mass of asphalt, and from the viewpoint of maintaining flexibility, it is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, still more preferably 15 parts by mass or less.

[0066] The content of the compound (A) in the asphalt mixture is preferably 0.03 parts by mass or more and 5 parts by mass or less, more preferably 0.06 parts by mass or more, still more preferably 0.1 parts by mass or more, based on 100 parts by mass of asphalt from the viewpoint of compacting property, and is more preferably 1 part by mass or less. Also, the content of the compound (A) in the asphalt mixture is preferably 0.1 parts by mass or more and 200 parts by mass or less, more preferably 0.5 parts by mass or more, still more preferably 1 part by mass or more, based on 100 parts by mass of the polyester resin from the viewpoint of compacting property, and is more preferably 100 parts by mass or less, still more preferably 50 parts by mass or less.

[0067] (Method for producing asphalt mixture) The asphalt mixture in the present invention can be obtained by a production method including a step of mixing asphalt, heated aggregate, polyester resin, and the above compound (A). Among them, it is preferable to obtain the asphalt mixture by a step of mixing asphalt and heated aggregate to obtain a mixture of asphalt and aggregate, and a step of mixing the mixture of asphalt and aggregate, the polyester resin, and the above compound (A) to obtain an asphalt mixture.

[0068] In the step of mixing asphalt and heated aggregate to obtain a mixture of asphalt and aggregate, the mixing temperature is preferably 130°C or higher and 200°C or lower, more preferably 140°C or higher, from the viewpoint of softening the asphalt, and is more preferably 190°C or lower, still more preferably 180°C or lower. Also, the mixing time is preferably 30 seconds or more, more preferably 1 minute or more, still more preferably 2 minutes or more, and even more preferably 5 minutes or more. The upper limit of the time is not particularly limited, but is, for example, about 30 minutes.

[0069] In the step of obtaining an asphalt mixture by mixing a mixture of asphalt and aggregate, a polyester resin, and the compound (A), from the viewpoint of softening the asphalt, the mixing temperature is preferably 130°C or higher and 200°C or lower, more preferably 140°C or higher, and more preferably 190°C or lower, still more preferably 180°C or lower. Also, the mixing time is preferably 30 seconds or more, more preferably 1 minute or more, still more preferably 2 minutes or more, and even more preferably 5 minutes or more. The upper limit of the time is not particularly limited, but is, for example, about 30 minutes.

[0070] The mixing preferably includes a step of stirring and mixing with a commonly used mixer until each component is uniformly dispersed. Examples of commonly used mixers include a homomixer, a dissolver, a paddle mixer, a ribbon mixer, a screw mixer, a planetary mixer, a vacuum countercurrent mixer, a roll mill, a twin-screw extruder, and the like.

[0071] The asphalt mixture in the present invention may be used as a heated asphalt mixture substantially free of water, or water may be added to the above asphalt mixture to form an asphalt emulsion, and aggregate or the like may be added thereto to be used as a normal-temperature asphalt mixture. The asphalt mixture in the present invention is preferably used as heated asphalt. The asphalt mixture preferably contains substantially no water from the viewpoint of exhibiting asphalt performance.

[0072] The method for producing an asphalt mixture molded body of the present invention includes a step of compacting the above asphalt mixture at 145°C or lower. The compacting can be performed, for example, with the same construction machinery configuration as that for normal asphalt paving construction. The compaction temperature of the asphalt mixture is 145°C or lower. The compaction temperature is preferably 100°C or higher, more preferably 120°C or higher, and preferably 140°C or lower.

[0073] By the production method of the present invention, an asphalt mixture molded body is obtained. The asphalt mixture molded body is, for example, an asphalt paving material layer for roads, parking lots, etc. The asphalt paving material layer may be either a base layer or a surface layer.

[0074] [Paving construction method] The paving construction method of the present invention includes a step of compacting an asphalt mixture containing asphalt, aggregate, a polyester resin, and the following compound (A) onto a paving target, and the compaction temperature is 145°C or lower. Compound (A): (i) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups, (ii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group, and (iv) Polyalkylene glycol One or more compounds selected from the group consisting of

[0075] Specifically, it has a step of compacting the above asphalt mixture onto a paving target such as a road or a parking lot to form an asphalt paving material layer. The asphalt paving material layer is usually a base layer or a surface layer, and from the viewpoint of exerting the effect of durability, it is preferably a surface layer.

[0076] The compaction construction can be carried out by the same construction machine composition and in the same manner as for ordinary asphalt mixtures. When used as a heated asphalt mixture, the compaction temperature of the asphalt mixture is 145°C or lower, preferably 100°C or higher, more preferably 120°C or higher, and preferably 140°C or lower.

Example

[0077] Regarding various physical properties, measurement and evaluation were performed by the following methods. In the following examples and comparative examples, unless otherwise specified, parts and % are based on mass.

[0078] (1) Softening point of polyester resin Using a flow tester "CFT-500D" (manufactured by Shimadzu Corporation), while heating 1 g of the sample at a heating rate of 6 °C / min, a load of 1.96 MPa was applied by a plunger and extruded from a nozzle with a diameter of 1 mm and a length of 1 mm. The plunger drop amount of the flow tester was plotted against the temperature, and the temperature at which half of the sample flowed out was taken as the softening point.

[0079] (2) Molecular weight of polyester The weight average molecular weight was determined by gel permeation chromatography (GPC) method by the following method. (i) Preparation of sample solution The sample was dissolved in chloroform at 40 °C so that the concentration became 0.5 g / 100 mL. Then, this solution was filtered using a PTFE type membrane filter "DISMIC-25JP" (manufactured by Toyo Roshi Kaisha, Ltd.) with a pore diameter of 0.20 μm to remove insoluble components, and used as a sample solution. (ii) Molecular weight measurement Using the following measuring device and analytical column, chloroform was used as the eluent and flowed at a flow rate of 1 mL / min, and the column was stabilized in a constant temperature bath at 40 °C. 200 μL of the sample solution was injected there and measurement was performed. The molecular weight of the sample was calculated based on a calibration curve prepared in advance. The calibration curve at this time included several types of monodisperse polystyrene (A-500 (5.0×10 2 ) manufactured by Tosoh Corporation, A-1000 (1.01×10 3 ), A-2500 (2.63×10 3 ), A-5000 (5.97×10 3 ), F-1 (1.02×10 4 ), F-2 (1.81×10 4 ), F-4 (3.97×10 4)、F-10 (9.64×10 4 )、F-20 (1.90×10 5 )、F-40 (4.27×10 5 )、F-80 (7.06×10 5 )、F-128 (1.09×10 6 )) were used as standard samples. The values in parentheses indicate the molecular weights. Measuring device: "HLC-8320GPC" (manufactured by Tosoh Corporation) Analysis column: "TSKgel Super HZM" + "TSKgel Super H-RC" × 2 columns (manufactured by Tosoh Corporation)

[0080] (3) Acid value and hydroxyl value of the polyester The acid value and hydroxyl value of the polyester were measured based on the method of JIS K0070:1992. However, only the measurement solvent was changed from the mixed solvent of ethanol and ether specified in JIS K0070:1992 to a mixed solvent of acetone and toluene (acetone:toluene = 1:1 (volume ratio)).

[0081] Production Example 1 The propylene oxide adduct of bisphenol A (BPA-PO) shown in Table 1 was placed in a 5-liter four-necked flask equipped with a thermometer, a stainless steel stirring rod, a reflux condenser, and a nitrogen inlet tube and heated to 100°C. At 100°C, alkenyl succinic anhydride (1) was added, the temperature was raised to 180°C at 2.0°C / min, and after reaching 180°C, a polycondensation reaction was carried out for 2 hours. At 180°C, terephthalic acid and polyethylene terephthalate (PET) were added, and the temperature was raised to 235°C at 2.0°C / min. Under a nitrogen atmosphere, 20 g of tin(II) bis(2-ethylhexanoate) and 2 g of gallic acid were added at 235°C, and a polycondensation reaction was carried out at 235°C for 6 hours. Then, after cooling to 180°C, alkenyl succinic anhydride (2) was added. The temperature was raised from 180°C to 220°C at 0.3°C / min, and the reaction was carried out at 220°C and 20 kPa until the softening point shown in Table 1 was reached to obtain a polyester resin P1. The measured physical property values are shown in Table 1.

[0082]

Table 1

[0083] Example 1 15 kg of the aggregate of the following composition (1) heated to 180°C was put into an asphalt mixer and mixed at 180°C for 60 seconds. Next, 0.81 kg of modified type II asphalt (Epocphalt D (trade name), manufactured by Nisshin Kasei Co., Ltd.) heated to 180°C was added and mixed in the asphalt mixer for 1 minute. Thereafter, 143.6 g of the polyester resin P1 obtained in Production Example 1 and 4.1 g of polyoxyethylene (13) stearyl ether as the compound (A-1) were simultaneously added and further mixed for 1 minute to obtain an asphalt mixture. The content of the compound (A-1) in the asphalt mixture was 0.5 part by mass with respect to 100 parts by mass of the asphalt. The obtained asphalt mixture was allowed to cool and cooled to about 140°C, and then 1180 g was filled into a mold. Thereafter, the temperature of the asphalt mixture was measured again, and when the temperature reached 135°C, it was compacted and molded on both sides 75 times each using an automatic asphalt compactor (model number: NA-507, manufactured by Nakajima Giken Co., Ltd.). Thereafter, it was allowed to cool to room temperature over 15 hours to obtain an asphalt specimen M-1 as an asphalt mixture molded body.

[0084] <Composition of aggregate (1)> No. 6 crushed stone: 40.0 parts by mass No. 7 crushed stone: 13.0 parts by mass Crushed sand: 10.0 parts by mass River sand: 22.0 parts by mass Mountain sand: 10.0 parts by mass Stone powder (calcium carbonate): 5.0 parts by mass Passing mass %: Sieve size 19.0 mm: 100% by mass Sieve size 9.50 mm: 80.1% by mass Sieve size 4.75 mm: 59.4% by mass Sieve size 2.36 mm: 43.4% by mass Sieve size 1.18 mm: 29.1% by mass Sieve size 600 μm: 18.9 mass% Sieve size 300 μm: 11.7 mass% Sieve size 150 μm: 7.6 mass%

[0085] [Evaluation] The obtained asphalt specimens were subjected to the following evaluation tests. <Marshall Stability Test>[[]] After demolding asphalt specimen M-1 and immersing it in a constant temperature water bath at 60°C for 30 minutes, using a Marshall loading device (manufactured by Nakajima Giken Co., Ltd.), the overturned asphalt specimen M-1 was crushed with a flat plate at a speed of 50 mm / min. The maximum load [kN] shown until it broke was defined as the Marshall stability. Other measurement conditions were in accordance with "B001 Marshall Stability Test" described in the third volume of "Pavement Survey and Test Method Handbook (2019 Edition)" (edited by The Japan Road Association, a public interest incorporated foundation). Note that the higher the value of the Marshall stability, the more excellent the durability of the asphalt pavement. The results are shown in Table 2.

[0086] <Measurement of Void Ratio>[[]] Based on the weight in air and the weight in water of asphalt specimen M-1, the void ratio of the asphalt specimen was determined in accordance with the measurement method specified in "B008-1 Density Test Method for Dense-Graded Asphalt Mixtures, etc." described in the third volume of "Pavement Survey and Test Method Handbook (2019 Edition)" (edited by The Japan Road Association, a public interest incorporated foundation). By measuring the void ratio under the same conditions, the workability of the asphalt mixture can be evaluated. The results are shown in Table 2.

[0087] Examples 2 to 10[[]] Asphalt specimens M-2 to M-10 were obtained in the same manner as in Example 1, except that 4.1 g of compounds (A-2) to (A-10) shown in Table 2 were used instead of 4.1 g of compound (A-1). The Marshall stability test and the measurement of the void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0088] ​​​ Example 11 An asphalt specimen M-11 was obtained as an asphalt mixture molded body in the same manner as in Example 1, except that 0.81 g of Compound (A-1) was used instead of 4.1 g of Compound (A-1). The content of Compound (A-1) in the asphalt mixture was 0.1 part by mass with respect to 100 parts by mass of asphalt. The Marshall stability test and the measurement of void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0089] Example 12 An asphalt specimen M-12 was obtained as an asphalt mixture molded body in the same manner as in Example 1, except that 16.2 g of Compound (A-1) was used instead of 4.1 g of Compound (A-1). The content of Compound (A-1) in the asphalt mixture was 2.0 parts by mass with respect to 100 parts by mass of asphalt. The Marshall stability test and the measurement of void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0090] Example 13 An asphalt specimen M-13 was obtained as an asphalt mixture molded body in the same manner as in Example 1, except that 15 kg of the aggregate of the following Composition (2) was used instead of 15 kg of the aggregate of Composition (1). The Marshall stability test and the measurement of void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0091] <Aggregate of Composition (2)> No. 6 crushed stone: 40.0 parts by mass No. 7 crushed stone: 13.0 parts by mass Sea sand: 41.0 parts by mass Stone powder (calcium carbonate): 6.0 parts by mass Passing mass %: Sieve size 19.0 mm: 100% by mass Sieve size 9.50 mm: 80.1% by mass Sieve size 4.75 mm: 59.4% by mass Sieve size 2.36 mm: 40.2% by mass Sieve size 1.18 mm: 32.1 mass% Sieve size 600 μm: 23.4 mass% Sieve size 300 μm: 15.3 mass% Sieve size 150 μm: 7.6 mass%

[0092] Comparative Example 1 An asphalt specimen M-c1 was obtained as an asphalt mixture molded body in the same manner as in Example 1, except that compound (A-1) was not used. The Marshall stability test and the measurement of the void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0093] Comparative Example 2 An asphalt specimen M-c2 was obtained as an asphalt mixture molded body in the same manner as in Example 1, except that compound (a-1) was used instead of compound (A-1). The Marshall stability test and the measurement of the void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0094] Comparative Example 3 An asphalt specimen M-c3 was obtained as an asphalt mixture molded body in the same manner as in Example 13, except that compound (A-1) was not used. The Marshall stability test and the measurement of the void ratio were carried out in the same manner as in Example 1. The results are shown in Table 2.

[0095] Reference Example 1 An asphalt mixture was obtained in the same manner as in Example 1, except that compound (A-1) was not used. 1180 g of the obtained asphalt mixture was filled into a mold while maintaining the temperature at about 165°C. Then, while continuously maintaining the temperature of the asphalt mixture at 165°C, both sides were compacted 75 times each using an automatic asphalt compactor (model number: NA-507, manufactured by Nakajima Giken Co., Ltd.) to form a shape. Then, it was allowed to cool to room temperature over 15 hours to obtain an asphalt specimen M-s1 as an asphalt mixture molded body. Marshall stability tests and measurements of void ratio were conducted in the same manner as in Example 1. The results are shown in Table 2.

[0096] Reference Example 2 An asphalt mixture was obtained in the same manner as in Example 13, except that compound (A-1) was not used. 1180 g of the obtained asphalt mixture was filled into a mold while maintaining the temperature at about 165°C. Then, while continuously maintaining the temperature of the asphalt mixture at 165°C, both sides were compacted 75 times each using an automatic asphalt compactor (model number: NA-507, manufactured by Nakajima Kogyo Hanbai Co., Ltd.) to form a shape. Thereafter, it was allowed to cool to room temperature over 15 hours to obtain an asphalt specimen M-s2 as an asphalt mixture molded body. Marshall stability tests and measurements of void ratio were conducted in the same manner as in Example 1. The results are shown in Table 2.

[0097] Compounds (A-1) to (A-10) and compound (a-1) used in Examples 1 to 13 and Comparative Example 2 are shown below. Compound (A-1): Polyoxyethylene (13) stearyl ether Compound (A-2): Polyoxyethylene (50) stearyl ether Compound (A-3): Polyoxyethylene (23) lauryl ether Compound (A-4): Polyoxyethylene (13) (mono-, di-, tri-) styrenated phenyl ether Compound (A-5): Polyoxyethylene (20) sorbitan monostearate Compound (A-6): Glycerol monooleate Compound (A-7): Sorbitan monostearate Compound (A-8): Polyoxyethylene (20) sorbitan monolaurate Compound (A-9): Polyethylene glycol (EO140) monostearate Compound (A-10): Polyethylene glycol (MW8500) Compound (a-1): N,N'-ethylenebisstearamide

[0098]

Table 2

[0099] From Table 2, it can be seen that asphalt specimens M-1 to M-12 of Examples 1 to 12 produced at a compaction temperature of 135°C from asphalt mixtures using an asphalt composition containing a polyester resin and Compound A maintain stability equal to or higher than that of asphalt specimens M-c1 and M-c2 of Comparative Examples 1 and 2 produced from asphalt mixtures not containing Compound A, and have a small porosity, indicating that excellent durability and high compaction performance can be achieved simultaneously. Also, it can be seen that asphalt specimen M-1 of Example 1 produced at a compaction temperature of 135°C using an asphalt composition containing Compound A has the same stability and porosity as asphalt specimen M-s1 of Reference Example 1 produced at a compaction temperature of 165°C using an asphalt mixture not containing Compound A. It can also be seen that there is a similar tendency in the comparison between asphalt specimen M-13 of Example 13 with different aggregate types, asphalt specimen M-c3 of Comparative Example 3, and asphalt specimen M-s2 of Reference Example 2.

Claims

1. A method for manufacturing an asphalt mixture molded body, comprising a step of compacting an asphalt mixture containing asphalt, aggregate, a polyester resin, and the following compound (A) at 145 ° C or lower. Compound (A): (i) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups, (ii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group, and (iv) Polyalkylene glycol One or more compounds selected from the group consisting of

2. The compound (A) is Glycerin alkyl ether, glycerin alkyl ester, sorbitan alkyl ether, sorbitan alkyl ester, Polyethylene glycol glycerin alkyl ether, polyethylene glycol glycerin alkyl ester, polyethylene glycol sorbitan alkyl ether, polyethylene glycol sorbitan alkyl ester, Polyethylene glycol alkyl ether, polyethylene glycol alkyl ester, and Polyethylene glycol The method for manufacturing an asphalt mixture molded body according to claim 1, which is one or more selected from the group consisting of

3. The method for manufacturing an asphalt mixture molded body according to claim 1 or 2, further comprising a step of mixing asphalt and heated aggregate to obtain a mixture of asphalt and aggregate, and a step of mixing the mixture of asphalt and aggregate, a polyester resin, and the following compound (A) to obtain an asphalt mixture.

4. The method for manufacturing an asphalt mixture molded body according to any one of claims 1 to 3, wherein the content of the compound (A) in the asphalt mixture is 0.03 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of asphalt.

5. The method for manufacturing an asphalt mixture molded body according to any one of claims 1 to 4, wherein the content of the compound (A) in the asphalt mixture is 0.1 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the polyester resin.

6. The method for producing an asphalt mixture molded body according to any one of claims 1 to 5, wherein the compound (A) is (ii) a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, or (iii) a compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group, and the average number of moles of addition of the oxyalkylene group is 2 or more and 1000 or less.

7. The method for producing an asphalt mixture molded body according to any one of claims 1 to 6, wherein the asphalt mixture molded body is an asphalt paving material layer of a road.

8. A paving method including a step of compacting and constructing an asphalt mixture containing asphalt, aggregates, a polyester resin, and the following compound (A) onto a paving target, A paving method in which the compacting temperature is 145°C or lower. Compound (A): (i) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and two or more hydroxy groups, (ii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms, an oxyalkylene group, and two or more hydroxy groups, (iii) A compound having an aliphatic hydrocarbon group or aryl group having 8 to 22 carbon atoms and an oxyalkylene group, and (iv) A polyalkylene glycol One or more compounds selected from the group consisting of

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