Environmentally friendly recycled asphalt composition and recycled asphalt mixture containing the same

Abstract

To provide a performance-restoring substance, a reclaimed asphalt composition comprising the same, and a reclaimed asphalt mixture containing the asphalt composition.SOLUTION: A performance-restoring substance comprises 25 wt.% or less of saturated hydrocarbon and 60 wt.% or more of aromatic hydrocarbon, where the kinematic viscosity is 80-200 cSt at 60°C, and 5-40 cSt at 100°C, the difference between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C is 75-195, the specific gravity is 0.94-1.00, and the flash point is higher than 250°C. Also provided are an asphalt composition comprising the same and a reclaimed asphalt mixture containing the same.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an environmentally friendly recycled asphalt composition and a recycled asphalt mixture containing the same, and more particularly to a performance-restoring substance having specific physical properties, an asphalt composition containing the same, a recycled asphalt composition, a recycled asphalt mixture, and a method for producing the same. [Background technology]

[0002] Asphalt mixture, commonly referred to as "ascon," is manufactured in an asphalt mixing plant by adding asphalt, aggregate, and filler, then heating and mixing these materials at a high temperature of 160-180°C. After being laid and compacted on roads, it is cooled to room temperature and subjected to prolonged use over several years, exposed to various environmental conditions such as sunlight and rainwater.

[0003] Therefore, not only is a large amount of energy required for high-temperature heating, but the manufacturing and construction of asphalt mixtures also generate the emission of harmful gases such as carbon dioxide, sulfur oxides, and nitrogen oxides, which can have adverse effects on the environment and the health of workers constructing asphalt pavements.

[0004] Furthermore, during road paving, the asphalt mixture, produced at high temperatures of 160-180°C, takes a long time to cool to room temperature. This not only delays the time the road can be opened to traffic but also exposes workers to the risk of safety accidents. Additionally, because the asphalt is produced at high temperatures, oxidative aging occurs relatively quickly, leading to premature pavement cracking and a shortened pavement lifespan.

[0005] Asphalt concrete used for road paving that has reached the end of its lifespan is classified as construction waste, and a large amount of it is generated every year. Disposing of such a large amount of waste requires a vast amount of burial space, which destroys the natural environment. When asphalt and residual cement that have leached out from the buried material by rainwater flow into the soil, they contaminate groundwater and rivers in turn, acting as a major cause of environmental pollution.

[0006] Therefore, recycling asphalt concrete by recycling the large quantities of waste asphalt concrete generated is attracting attention as an alternative to reduce environmental pollution and to supplement the explosively increasing demand for asphalt. As research on recycled asphalt concrete has become more active, methods such as plant-heated recycled asphalt mixture recycling and hot-in-place surface recycling have been developed. However, both the plant method and the surface recycling method have the problem that they are difficult to apply at room temperature and must be applied by heating.

[0007] To address these issues, research is actively being conducted on a method of recycling waste asphalt that involves mixing recycled aggregate derived from waste asphalt with emulsified asphalt at room temperature. At the national level, waste asphalt has been designated as a specified by-product for recycling, and the "Law for the Promotion of Recycling of Construction Waste" and "Quality Standards for Recycled Aggregate" have been enacted to increase the recycling rate while maintaining high quality.

[0008] However, waste asphalt concrete produced by this recycling method has a problem in that the bonding force between particles is not strong in the initial stages of construction, and the mixture tends to separate in the early stages. In order to increase the effective recycling of waste asphalt concrete, it should be used as heated or cold-recycled asphalt, but in the case of heated asphalt, which requires high heat, a large amount of carbon dioxide is emitted, and when used to pave roads, it causes problems such as cracking or failure at an early stage. In addition, there is a problem in that the distribution of aggregate particles from recycled waste asphalt concrete is not uniform, making it difficult to meet the quality standards for asphalt mixtures.

[0009] In other words, waste asphalt concrete has problems with its regeneration capacity and exhibits lower efficiency compared to new asphalt. Therefore, there is a need for research on performance restoration materials with superior regeneration capabilities and asphalt compositions containing them. [Overview of the project] [Problems that the invention aims to solve]

[0010] The present invention provides a performance-restoring substance having remarkably improved regenerative capabilities, an asphalt composition containing the same, and a recycled asphalt composition containing the said asphalt composition.

[0011] Furthermore, the present invention provides recycled asphalt mixtures containing the asphalt composition, recycled asphalt composition, or mixtures thereof, and methods for producing the same. [Means for solving the problem]

[0012] The present invention provides a performance-restoring material having controlled specific components and controlled specific physical properties. The performance-restoring material of the present invention contains 25% by weight or less of saturated hydrocarbons and 60% by weight or more of aromatic hydrocarbons, has a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, a difference of 75 to 195 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, a specific gravity of 0.94 to 1.00, and a flash point higher than 250°C.

[0013] Preferably, the performance-restoring material according to one embodiment of the present invention may have an initial boiling point of 250°C or higher.

[0014] Preferably, the performance-restoring material according to one embodiment of the present invention may contain 5 to 25% by weight of saturated hydrocarbons, 60 to 80% by weight of aromatic hydrocarbons, 0.1 to 10% by weight of resin, and 0.1 to 5% by weight of asphaltene.

[0015] In one embodiment of the present invention, the performance-restoring material can satisfy the following formula 1 in terms of the content x of aromatic hydrocarbons and the content y of saturated hydrocarbons. [Formula 1] 2.0 <x / y<5.5

[0016] Furthermore, the present invention provides an asphalt composition containing the performance-restoring substance of the present invention.

[0017] In other words, the asphalt composition of the present invention comprises a performance-restoring substance having a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, a difference of 75 to 195 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, a specific gravity of 0.94 to 1.00, and a flash point higher than 250°C, along with novel asphalt and a peeling inhibitor.

[0018] The performance-restoring substance according to one embodiment of the present invention may contain 0.1 to 20 parts by weight per 100 parts by weight of new asphalt, and the peeling inhibitor may contain 0.01 to 2 parts by weight per 100 parts by weight of new asphalt.

[0019] An anti-stripping agent according to one embodiment of the present invention may be a compound comprising a repeating unit of the following chemical formula 1, wherein at least one of the terminal groups comprises the following chemical formula 2. [Chemical formula 1] [ka] [Chemical formula 2] [ka] (In Chemical Formulas 1 and 2, A is selected from hydrogen or Chemical Formula 2, R1 is C1-C30 alkyl.)

[0020] Preferably, the asphalt composition according to an embodiment of the present invention may have a penetration (1 / 10 mm, 25 °C, 100 g, 5 seconds) of 100 to 170 dmm and an absolute viscosity (60 °C) of 600 to 1500 poise.

[0021] The present invention also provides a recycled asphalt composition comprising the asphalt composition of the present invention and waste asphalt.

[0022] The recycled asphalt composition according to an embodiment of the present invention may have a penetration (1 / 10 mm, 25 °C, 100 g, 5 seconds) of 60 to 80 dmm and an absolute viscosity (60 °C) of 1500 to 2200 poise.

[0023] The recycled asphalt composition according to an embodiment of the present invention is T c.s (300 MPa) - T c.m (0.300) value may be 1.8 °C or higher.

[0024] The present invention also provides a recycled asphalt mixture comprising the asphalt composition of the present invention, the recycled asphalt composition or a mixture thereof, waste ascon, and aggregate.

[0025] The present invention also provides a method for producing the recycled asphalt mixture of the present invention. The method for producing the recycled asphalt mixture of the present invention includes a step of premixing the asphalt composition of the present invention, the recycled asphalt composition or a mixture thereof, and a step of mixing waste ascon and aggregate with the composition premixed in the step.

[0026] The step of premixing the asphalt composition, recycled asphalt composition, or mixture thereof according to one embodiment of the present invention is carried out at a temperature of 100 to 190°C for 1 to 120 minutes, and the mixing step may be carried out at a temperature of 100 to 190°C for 10 to 100 seconds. [Effects of the Invention]

[0027] The performance-restoring material of the present invention contains controlled specific components in controlled amounts and has controlled specific physical properties, so that recycled asphalt mixtures containing it have superior physical properties at or above the level of new asphalt.

[0028] Furthermore, the performance-restoring material of the present invention has a high flash point and initial boiling point, generates few harmful compounds such as volatile organic compounds (VOCs), and is extremely environmentally friendly.

[0029] Therefore, the asphalt composition of the present invention, by containing the performance-restoring substance of the present invention having controlled components and physical properties, has high penetration and an excellent viscosity range, and the recycled asphalt composition containing it has extremely excellent regeneration capabilities.

[0030] Furthermore, the recycled asphalt composition of the present invention has physical properties such as strength, viscosity, stability, and flexibility that are equivalent to or better than those of a novel asphalt composition.

[0031] Furthermore, the recycled asphalt composition of the present invention, by containing the asphalt composition of the present invention, has good miscibility with waste asphalt concrete and other components, and possesses excellent recycling capabilities.

[0032] Furthermore, the asphalt composition, recycled asphalt composition, or recycled asphalt mixture containing these mixtures of the present invention not only exhibits excellent regeneration capabilities and improved adhesion, but also enhanced moisture resistance. Paved roads constructed using these mixtures have an extended lifespan, reduced maintenance costs, and are highly economical. They also possess excellent resistance to plastic deformation, cracking, aggregate mixing, and compaction. [Modes for carrying out the invention]

[0033] The present invention will now be described in more detail. Unless otherwise defined, the technical and scientific terms used herein have the meaning that a person with ordinary skill in the art to which the present invention belongs would ordinarily understand. Therefore, descriptions of known functions and configurations that could obscure the gist of the present invention from the following description will be omitted.

[0034] The "performance-restoring substance" described in the present invention is a composition for recycling waste asphalt and can be used in all asphalt compositions. Including it improves the waste asphalt recycling capacity of all asphalt compositions that include waste asphalt.

[0035] The "asphalt composition" described in the present invention means a composition comprising novel asphalt, the performance-restoring substance of the present invention, and a peeling inhibitor.

[0036] Furthermore, the "recycled asphalt composition" described in the present invention means a composition comprising the asphalt composition of the present invention and waste asphalt.

[0037] Furthermore, the term "recycled asphalt mixture" as described in the present invention means the asphalt composition of the present invention, the recycled asphalt composition, or a composition comprising these mixtures with waste asphalt and aggregate. The term "waste asphalt" as described in the present invention means all aged asphalt, such as general asphalt, modified asphalt, and recycled asphalt. The recycled asphalt mixture of the present invention may further contain fillers and the like. When manufacturing the recycled asphalt mixture of the present invention, the performance restoration substance of the present invention, new asphalt, peeling inhibitor, waste asphalt and aggregate can be added and mixed separately. Alternatively, an asphalt composition containing new asphalt, peeling inhibitor, and performance restoration substance can be pre-mixed before adding waste asphalt, aggregate, fillers, etc. It goes without saying that the recycled asphalt mixture can be manufactured by any method other than those described above that a person skilled in the art can recognize.

[0038] The term "alkyl" as used in this invention refers to an aliphatic hydrocarbon group having 1 to 30 carbon atoms, preferably 1 to 30 carbon atoms. When used alone or in combination, the alkyl groups may be linear or branched alkyl groups. Specifically, linear or branched alkyl groups may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl, n-hexyl, isohexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, and the like.

[0039] One aspect of the present invention will be described in detail below.

[0040] The present invention provides a performance restoration material that has controlled specific physical properties by containing specific components in controlled amounts, and can dramatically improve the regeneration capacity of waste asphalt. The performance restoration material of the present invention may preferably be a performance restoration material for asphalt.

[0041] The performance-restoring substance of the present invention is a composition characterized by containing 25% by weight or less of saturated hydrocarbons and 60% by weight or more of aromatic hydrocarbons, having a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, a difference of 75 to 195 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, a specific gravity of 0.94 to 1.00, and a flash point higher than 250°C.

[0042] The performance-restoring material of the present invention contains controlled specific components, and furthermore, these components have controlled content, giving it specific physical properties and remarkable regenerative capacity for waste asphalt.

[0043] In particular, the performance-restoring material of the present invention is an asphalt performance-restoring material that, by containing controlled specific components in specific amounts, has a specific kinematic viscosity range, specific gravity, and flash point within a specific temperature range, thereby possessing extremely improved regeneration capabilities.

[0044] To have improved physical properties, preferably, the performance-restoring material according to one embodiment of the present invention contains 25% by weight or less of saturated hydrocarbons and 60% by weight or more of aromatic hydrocarbons.

[0045] Preferably, the performance-restoring material according to one embodiment of the present invention has a kinematic viscosity of 90 to 190 cSt at 60°C and 15 to 35 cSt at 100°C, and the difference between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C may be 75 to 175.

[0046] The performance restoration material according to one embodiment of the present invention has a kinematic viscosity within a specific range at a specific temperature, and the difference in kinematic viscosity between two specific temperatures is within a controlled specific range, thereby exhibiting a remarkably improved regeneration capability as a performance restoration material for waste asphalt.

[0047] The kinematic viscosity according to one embodiment of the present invention was measured by a method that converts the velocity at which the liquid flows in a predetermined capillary tube, and specifically, it was measured at a temperature controlled in accordance with the ASTM D445 standard.

[0048] More preferably, the performance-restoring material according to one embodiment of the present invention has a kinematic viscosity of 100 to 190 cSt at 60°C and 20 to 35 cSt at 100°C, the difference between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C may be 80 to 170, and the initial boiling point may be higher than 250°C.

[0049] The performance-restoring material according to one embodiment of the present invention has a high flash point and initial boiling point, and when recycled asphalt compositions and recycled asphalt mixtures containing it are mixed, heated, or applied, less volatile harmful compounds are generated, making it more environmentally friendly in terms of the working environment and the environment as a whole.

[0050] Preferably, the flash point of the performance-restoring material according to one embodiment of the present invention may be 200°C or higher, preferably 250°C or higher, and more preferably 250 to 350°C, and the initial boiling point may be 300°C or higher, preferably 350°C or higher, and more preferably 350 to 400°C.

[0051] A performance-restoring material according to one embodiment of the present invention may preferably contain 5 to 25% by weight of saturated hydrocarbons, 60 to 80% by weight of aromatic hydrocarbons, 0.1 to 10% by weight of resin, and 0.1 to 5% by weight of asphaltene. By containing saturated hydrocarbons, aromatic hydrocarbons, resin, and asphaltene in the above ranges, the performance-restoring material according to one embodiment of the present invention can further improve the regeneration capacity of waste asphalt and also improve crack resistance.

[0052] Preferably, the performance-restoring material according to one embodiment of the present invention may contain 10 to 25% by weight of saturated hydrocarbons, 60 to 70% by weight of aromatic hydrocarbons, 5 to 10% by weight of resin, and 0.5 to 3% by weight of asphaltene.

[0053] The performance-restoring material of the present invention comprises saturated hydrocarbons, aromatic hydrocarbons, resins, and asphaltenes.

[0054] Preferably, the performance-restoring material according to one embodiment of the present invention comprises 10 to 25% by weight of saturated hydrocarbons, 60 to 70% by weight of aromatic hydrocarbons, 5 to 10% by weight of resin, and 0.5 to 3% by weight of asphaltene, has a specific gravity of 0.95 to 1.00, a flash point higher than 250°C, an initial boiling point of 300°C or higher, a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, and a difference of 75 to 195 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, thereby having improved regeneration capabilities.

[0055] Preferably, the performance-restoring substance according to one embodiment of the present invention can satisfy the following formula 1 in terms of the content x of aromatic hydrocarbons and the content y of saturated hydrocarbons.

[0056] [Formula 1] 2.0 <x / y<5.5

[0057] In the above formula, x represents the weight percentage of aromatic hydrocarbons contained in the performance-restoring material, and y represents the weight percentage of saturated hydrocarbons contained in the performance-restoring material.

[0058] Preferably, the performance-restoring substance according to one embodiment of the present invention can satisfy the following formula 2, where the content x of aromatic hydrocarbons and the content y of saturated hydrocarbons are such that they satisfy formula 2.

[0059] [Formula 2] 2.5 <x / y<4.5

[0060] The performance-restoring material according to one embodiment of the present invention has a controlled ratio of aromatic hydrocarbon content to saturated hydrocarbon content, thereby exhibiting improved regeneration capabilities.

[0061] Preferably, the performance-restoring substance according to one embodiment of the present invention may be a composition comprising 5 to 25% by weight of saturated hydrocarbons, 60 to 70% by weight of aromatic hydrocarbons, 0.1 to 5% by weight of asphaltenes, and 5 to 10% by weight of resin, having a specific gravity of 0.94 to 0.98, a flash point higher than 250°C, a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, a difference of 75 to 115 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, and satisfying the following formula 1.

[0062] [Formula 1] 2.0 <x / y<5.5 In the above formula 1, x represents the weight percentage of aromatic hydrocarbons contained in the performance-restoring substance, and y represents the weight percentage of saturated hydrocarbons contained in the performance-restoring substance.

[0063] Furthermore, the present invention provides an asphalt composition comprising the performance-restoring substance of the present invention, a novel asphalt, and a peeling inhibitor.

[0064] In other words, the present invention provides an asphalt composition comprising a performance-restoring substance containing 25% by weight or less of saturated hydrocarbons and 60% by weight or more of aromatic hydrocarbons, having a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, a difference of 75 to 115 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, a specific gravity of 0.94 to 1.00, and a flash point higher than 250°C, along with a novel asphalt and a peeling inhibitor.

[0065] The asphalt composition of the present invention, by containing the performance-restoring substance of the present invention, has high penetration and can regenerate waste asphalt so that when mixed with waste asphalt, it has physical properties equivalent to or better than those of a new asphalt mixture.

[0066] Preferably, the performance-restoring substance of the present invention may be present in an amount of 0.1 to 20 parts by weight, and more preferably 5 to 15 parts by weight, per 100 parts by weight of new asphalt.

[0067] The peeling inhibitor contained in the asphalt composition of the present invention may be present in an amount of 0.01 to 2 parts by weight, and more preferably 0.05 to 1 part by weight, per 100 parts by weight of new asphalt.

[0068] The anti-stripping agent according to one embodiment of the present invention may be a compound comprising a repeating unit of the following chemical formula 1, wherein at least one of the terminal groups comprises the following chemical formula 2.

[0069] [Chemical formula 1] [ka]

[0070] [Chemical formula 2] [ka]

[0071] (In chemical formulas 1 and 2, A is selected from hydrogen or chemical formula 2, and R1 is a C1-C30 alkyl group.)

[0072] An anti-peeling agent according to one embodiment of the present invention, in a preferred combination with the performance-restoring substance of the present invention, has better anti-peeling and softening effects. In the above chemical formulas 1 and 2, A is selected from the above chemical formula 2, and R1 may be a C5-C20 alkyl, and more preferably a C8-C18 alkyl.

[0073] The chemical formula 1 of the anti-peeling agent according to one embodiment of the present invention is a unit derived from a polyamine, and the chemical formula 2 may be a unit derived from an alkylglycidyl ether, and the alkylglycidyl ether may specifically be a C1-C30 alkylglycidyl ether, and the alkylglycidyl ether may be a mixture of two or more compounds having different alkyl groups.

[0074] The aforementioned polyamine means, but is not limited to, any one or more mixtures selected from the group of compounds represented by the following chemical formula 4.

[0075] [Chemical formula 4] [ka]

[0076] In the above chemical formula 4, m = 1 to 10.

[0077] More specifically, the polyamine may be a mixture of one or more selected from, for example, ethylenediamine, diethylenetriamine, triethylenetetraamine, tetraethylenepentaamine, pentaethylenehexaamine, hexaethyleneheptaamine, heptaethyleneoctaamine, octaethylenenonaamine, nonaethylenedecaamine, and decaethyleneundecaamine. It may also optionally further contain aromatic compounds such as aminoethylpiperazine.

[0078] More preferably, the mixture may contain diethylenetriamine, tetraethylenepentaamine, pentaethylenehexaamine, hexaethyleneheptaamine, and polyethylenepolyamine, and may have a number-average molecular weight of 250 to 300 g / mol and an amine content of 1100 to 1300 mgKOH / g, but is not limited thereto.

[0079] In the above chemical formula 4, m may be an integer selected from 7 to 10, and preferably, the polyamine according to one embodiment of the present invention may be a mixture of two or more compounds in the above chemical formula 4 in which m is selected from 7 to 10.

[0080] The alkylglycidyl ether refers to, but is not limited to, a mixture of two or more compounds having different alkyl groups, selected from the group of compounds represented by the following chemical formula 5.

[0081] [Chemical formula 5] [ka]

[0082] In the above chemical formula 5, R 11 These are C1-C30 alkyl groups.

[0083] More preferably, in the chemical formula 5, R 11 This may be a C8-C18 alkyl group.

[0084] More preferably, the alkylglycidyl ether according to one embodiment of the present invention is R in the chemical formula 5. 11 A compound in which is a C8-C18 alkyl group may be a mixture of two or more compounds having different alkyl groups.

[0085] The anti-peeling agent according to one embodiment of the present invention may be any one or more compounds selected from the compounds represented by the following chemical formula 3.

[0086] [Chemical formula 3] [ka]

[0087] (In the above chemical formula 3, n is an integer selected from 0 to 10. The aforementioned R1 is a C1-C30 alkyl group. A, R2, and R3 are each independently hydrogen or [ka] Selected from, One or more of A, R2, and R3 mentioned above must be [ka] And, The aforementioned R4 is a C1-C30 alkyl group.

[0088] In chemical formula 3 according to one embodiment of the present invention, n may be an integer selected from 0 to 10, more preferably selected from 3 to 10.

[0089] Furthermore, if n is 2 or more, A may be the same or different, and each may be hydrogen or [ka] You may choose from the following.

[0090] A compound of chemical formula 3 according to one embodiment of the present invention exhibits excellent peel-prevention function, miscibility, and compaction properties in the range of 500 to 1500 g / mol weight-average molecular weight, but is not limited thereto.

[0091] An anti-peeling agent according to one embodiment of the present invention may have a total amine content of 100 to 1500 mg KOH / g, a kinematic viscosity measured at 25°C of 1500 to 15000 cSt, and a nitrogen / oxygen molar ratio of 0.5 to 4. More specifically, it may have a total amine content of 200 to 800 mg KOH / g, a kinematic viscosity measured at 25°C of 2000 to 13000 cSt, and a nitrogen / oxygen molar ratio of 0.7 to 3.5. Within the above range, the miscibility of asphalt and aggregate, the compaction properties of the asphalt mixture, and water resistance can be further improved. The above range can be adjusted depending on the type and content of the polyamine and alkyl glycidyl ether.

[0092] The total amine content of the peeling inhibitor according to one embodiment of the present invention can be measured in accordance with ASTM D2896 and affects the improvement of the peeling prevention function of asphalt. The above effect can be achieved when the total amine content is in the range of 100 to 1500 mg KOH / g, more preferably 200 to 800 mg KOH / g.

[0093] An asphalt composition according to one embodiment of the present invention, by including a combination of a specific performance-restoring substance and a specific peeling inhibitor in the novel asphalt, has lower viscosity and significantly improved softening effect compared to conventional asphalt compositions when adjusted to the same penetration degree.

[0094] Specifically, the asphalt composition of the present invention has high penetration and low absolute viscosity, resulting in excellent regeneration performance and a remarkably improved softening effect.

[0095] The asphalt composition of the present invention, by containing specific components in controlled amounts, and by including a combination of a performance-restoring substance having controlled specific physical properties and a peeling inhibitor represented by the chemical formula 1, improves the regeneration capacity of asphalt and exhibits excellent water resistance.

[0096] In other words, preferably, an asphalt composition according to one embodiment of the present invention may contain the performance-restoring substance of the present invention, and may have a penetration depth (1 / 10 mm, 25°C, 100 g, 5 seconds) of 100 to 170 d mm and an absolute viscosity (60°C) of 600 to 1500 poise. Having a high penetration depth in the above range provides superior regeneration ability, crack resistance, etc., and a more preferable penetration depth range may be 110 to 160 d mm.

[0097] Preferably, the asphalt composition of the present invention may have a penetration (1 / 10 mm, 25°C, 100 g, 5 seconds) of 120 to 150 d mm and an absolute viscosity (60°C) of 600 to 1000 poise.

[0098] Furthermore, the present invention provides a recycled asphalt composition comprising the asphalt composition of the present invention and waste asphalt.

[0099] Specifically, the recycled asphalt composition of the present invention comprises a performance-restoring substance containing 25% by weight or less of saturated hydrocarbons and 60% by weight or more of aromatic hydrocarbons, a kinematic viscosity of 80 to 200 cSt at 60°C and 5 to 40 cSt at 100°C, a difference of 75 to 115 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, a specific gravity of 0.94 to 1.00, and a flash point higher than 250°C, along with new asphalt and a peeling inhibitor, as well as waste asphalt.

[0100] The recycled asphalt composition of the present invention, by containing the performance-restoring substance of the present invention, exhibits remarkably improved regeneration capabilities, excellent water resistance, and high penetration.

[0101] Therefore, the recycled asphalt composition of the present invention may have a penetration degree (1 / 10 mm, 25°C, 100 g, 5 seconds) of 60 to 80 d mm and an absolute viscosity before degradation (60°C) of 1500 to 2200 poise.

[0102] Preferably, a recycled asphalt composition according to one embodiment of the present invention contains an asphalt composition containing the performance-restoring substance of the present invention, and has a viscosity (absolute viscosity) of 1600 to 2000 poise before degradation and a viscosity of 3200 to 4500 poise after degradation at 163°C for 5 hours, and has physical properties at a level equivalent to new asphalt, indicating that the waste asphalt has been recycled.

[0103] Furthermore, the asphalt composition according to one embodiment of the present invention may have a Tc.s(300MPa)-Tc.m(0.300) value of 1.8°C or higher, more preferably a Tc.s(300MPa)-Tc.m(0.300) value of 1.8 to 3.0°C, and even more preferably 2.0 to 3.0°C.

[0104] From this, it can be seen that the regeneration capacity of the recycled asphalt composition containing the performance-restoring substance of the present invention is significantly improved.

[0105] A recycled asphalt composition according to one embodiment of the present invention contains the performance-restoring substance and peeling inhibitor of the present invention, and has excellent crack resistance, compaction properties, and mixability with aggregates, etc., and its recycling capacity is remarkably improved.

[0106] Furthermore, the present invention provides a recycled asphalt mixture comprising the asphalt composition of the present invention, a recycled asphalt composition, or a mixture thereof, waste asphalt concrete, and aggregate.

[0107] A recycled asphalt mixture according to one embodiment of the present invention, by containing the asphalt composition of the present invention, the recycled asphalt composition of the present invention, or a mixture thereof, exhibits extremely excellent crack resistance, compaction properties, and mixability with aggregates, etc., and its recycling capacity is remarkably improved.

[0108] Preferably, the recycled asphalt mixture according to one embodiment of the present invention may further include a compactor and a filler.

[0109] Preferably, a recycled asphalt mixture according to one embodiment of the present invention may contain 1 to 10% by weight of an asphalt composition, a recycled asphalt composition, or a mixture thereof, 10 to 50% by weight of waste asphalt concrete, and 50 to 80% by weight of aggregate and filler. More preferably, it may further contain 2 to 5% by weight of an asphalt composition, a recycled asphalt composition, or a mixture thereof, 25 to 40% by weight of waste asphalt concrete, and 55 to 70% by weight of aggregate and filler.

[0110] The recycled asphalt mixture of the present invention, by containing specific components in controlled amounts, includes an asphalt composition, recycled asphalt composition, or mixture thereof that contains a combination of the performance-restoring substance of the present invention and a peeling inhibitor represented by the chemical formula 1, thereby greatly improving the recycling capacity of waste asphalt concrete, enhancing moisture resistance, compaction, mixability, and crack resistance, and providing excellent productivity, workability, and asphalt performance when applied asphalt using this mixture.

[0111] The absolute viscosity of the present invention can be measured in accordance with ASTM D445, and is preferably within a viscosity range that provides easy flow and improves mixability during the production of the recycled asphalt composition. Specifically, the desired effect can be achieved in a viscosity range of 1500 to 2200 poise measured at 60°C.

[0112] Furthermore, the novel asphalt of the present invention may be selected from those classified as having a high-temperature serviceability grade of 46 to 82°C and a low-temperature grade of -10 to -40°C according to KS F 2389. Within the above range, it is preferable, but not limited, to select an asphalt of an appropriate grade according to the climate and traffic conditions of the region.

[0113] Furthermore, the recycled asphalt mixture of the present invention may further contain, in addition to the performance-restoring substance of the present invention, one or more mixtures selected from asphalt penetration modifiers and asphalt softeners.

[0114] The aforementioned asphalt penetration modifier and asphalt softener are not limited to any components commonly used in the industry, and specifically, may, but are not limited to, one or more selected from, for example, petroleum-based vacuum distillation by-products, heavy oil fluid bed catalytic cracking by-products, deasphaltene by-products, lubricating oils, and animal and plant fractions.

[0115] The content is not limited, but it can be used in amounts of 0.05 to 20 parts by weight, preferably 0.1 to 15 parts by weight, and preferably 0.5 to 12 parts by weight, per 100 parts by weight of the asphalt composition. This range is sufficient to achieve the desired effect and is economically appropriate. However, it is not limited to this range.

[0116] In one embodiment of the present invention, the recycled asphalt mixture may further comprise one or more mixtures selected from the group consisting of polymeric modifiers and hydrocarbon modifiers.

[0117] More specifically, the polymeric modifier may be any one or more mixtures selected from natural rubber, styrene-butadiene-rubber copolymer, styrene-butadiene-styrene copolymer, polyethylene, polypropylene, nylon, vinyl chloride, ethylene methacrylate, ethylene propylene rubber, ethylene vinyl acetate copolymer, polybutadiene, polyisoprene, butyl rubber, styrene-butadiene rubber, polychloroprene rubber, and recycled tire rubber, but is not limited thereto. The polymeric modifier may have a weight-average molecular weight of 50,000 to 600,000 g / mol, although this is not limited thereto. Its content may be 0.5 to 15% by weight, more preferably 2 to 12% by weight, of the modified asphalt content, but is not limited thereto.

[0118] Furthermore, examples of the hydrocarbon modifier may include, but are not limited to, one or more mixtures selected from wax-based asphalt additives, natural asphalt, petroleum-based pitch, and gilsonite. The content of the hydrocarbon modifier may be 0.5 to 15% by weight, more preferably 2 to 12% by weight, of the modified asphalt content, but is not limited to this. The aggregate according to one embodiment of the present invention can use natural aggregate, recycled aggregate, and mixed aggregate thereof. The recycled aggregate may be, for example, a mixture of one or more selected from the group consisting of industrial waste such as construction waste and steel slag, and aggregate obtained from waste asphalt pavement. The mixed aggregate of natural aggregate and recycled aggregate may contain, but is not limited to, 30 to 99.9% by weight of natural aggregate and 0.1 to 70% by weight of recycled aggregate.

[0119] The aggregate content and size are determined according to the type of pavement to be constructed, the void ratio, the ground conditions of the road surface to be constructed, weather conditions, traffic volume, and the number of lanes, and are therefore not limited. As a specific example, the aggregate content may be 50 to 80% by weight of the total weight of the recycled asphalt mixture, and is not limited thereto.

[0120] The aggregate can be used by mixing coarse aggregate, fine aggregate, etc., depending on the type of pavement to be constructed.

[0121] The filler according to one embodiment of the present invention may be, but is not limited to, a mixture of one or more selected from limestone powder, slaked lime, Portland cement, recovered dust, electric furnace steelmaking dust, foundry dust, fly ash, carbon black, sulfur, lignin, cellulose fiber, nylon fiber, polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, and natural fibers. The content of the filler may be changed depending on the type of pavement to be constructed and is therefore not limited. Specifically, for example, the content of the filler may be, but is not limited to, 1 to 10% by weight of the total recycled asphalt mixture.

[0122] The aggregate and filler content according to one embodiment of the present invention may be changed depending on the void ratio of the asphalt to be constructed, and the aggregate and filler mixture content may be 60 to 90% by weight of the total asphalt mixture, but is not limited thereto.

[0123] A recycled asphalt mixture according to one embodiment of the present invention can improve its mixability with aggregate by containing a performance-restoring substance having controlled physical properties in an asphalt composition that includes specific components of the present invention in a controlled content. Furthermore, it has the effect of greatly improving mixability, compaction properties, and water resistance not only when using natural aggregates but also when using recycled aggregates such as waste asphalt concrete aggregates. A recycled asphalt mixture according to one embodiment of the present invention may contain 1 to 10% by weight, more preferably 2 to 5% by weight, of the asphalt composition, but is not limited thereto.

[0124] More specifically, the recycled asphalt mixture of the present invention may, but is not limited to, contain 10 to 50% by weight of waste asphalt concrete, 50 to 80% by weight of a mixture of aggregate and filler, and 1 to 10% by weight of an asphalt composition containing new asphalt and a performance-restoring substance. Furthermore, the asphalt composition may contain 0.1 to 20 parts by weight of the performance-restoring substance per 100 parts by weight of new asphalt. This range is preferred because it is sufficient and economical to improve the desired workability and moisture resistance, but is not limited to this range.

[0125] A recycled asphalt mixture according to one embodiment of the present invention may be used without limitation, as long as it contains additives commonly used in the art. Examples of additives used in the recycled asphalt mixture may include, but are not limited to, a mixture of one or more selected from wax-type medium-temperature asphalt (WMA) additives, amine-type medium-temperature asphalt (WMA) additives, additional delamination inhibitors, and rejuvenators, and may further include various additives depending on the type of pavement to be constructed.

[0126] A recycled asphalt mixture according to one embodiment of the present invention may be used in one or more of the surface, intermediate, and base layers of asphalt concrete, but is not limited thereto.

[0127] A recycled asphalt mixture according to one embodiment of the present invention may be used in asphalt concrete pavements selected from, but are not limited to, dense-graded asphalt concrete pavements, flow-resistant asphalt concrete pavements, coarse-graded asphalt concrete pavements, open-graded asphalt concrete pavements, permeable asphalt concrete pavements, and crushed stone mastic asphalt concrete pavements.

[0128] A recycled asphalt mixture according to one embodiment of the invention, by containing the performance-restoring substance of the present invention, has physical properties equivalent to or better than those of new asphalt.

[0129] Preferably, the asphalt composition of the present invention may have a penetration (1 / 10 mm, 25°C, 100 g, 5 seconds) of 100 to 170 dmm, and preferably 120 to 150 dmm (1 / 10 mm, 25°C, 100 g, 5 seconds).

[0130] The asphalt composition according to one embodiment of the present invention may have an absolute viscosity (60°C) of 600 to 1500 poise, preferably 650 to 800 poise.

[0131] The recycled asphalt composition according to one embodiment of the present invention may have a Tc.s(300MPa)-Tc.m(0.300) value of 1.5°C or higher, preferably 1.8°C or higher, and more preferably 2.0°C.

[0132] ΔTc (Delta Tc, °C), a value that measures the regeneration capacity of asphalt, is an indicator of asphalt flexibility, and is the critical temperature difference (T) between Creep Stiffness and m-value within the PG standard. C.S (300MPa)-T c.mA value of (0.300) indicates that the smaller the value, the lower the durability (especially the crack resistance) of the waste asphalt, according to research reports in the United States. The critical temperature is a value obtained by using BBR (Bending Beam Rheometer) equipment to evaluate the temperature at which the creep stiffness (resistance to creep load) becomes 300 MPa and the temperature at which the m-value (change in creep stiffness over time) becomes 0.3, and then calculating it using formulas 11, 12, and 13.

[0133] [Formula 11]

number

[0134] [Formula 12]

number

[0135] [Formula 13]

number

[0136] Preferably, the recycled asphalt composition according to one embodiment of the present invention has a penetration degree (1 / 10 mm, 25°C, 100 g, 5 seconds) of 60 to 80 d mm, an absolute viscosity (60°C) of 1500 to 2200 poise, and a Tc.s (300 MPa) - Tc.m (0.300) value of 1.5°C or higher. More preferably, the penetration degree (1 / 10 mm, 25°C, 100 g, 5 seconds) of 65 to 75 d mm, an absolute viscosity (60°C) of 1600 to 2000 poise, and a Tc.s (300 MPa) - Tc.m (0.300) value of 1.8 to 2.0°C or higher.

[0137] Next, a method for producing the recycled asphalt mixture of the present invention will be described.

[0138] The method for producing the recycled asphalt mixture of the present invention is not limited to the method that includes a performance-restoring substance according to one embodiment of the present invention, and can be produced by mixing the components that are normally included in the recycled asphalt mixture.

[0139] Preferably, one method for producing the recycled asphalt mixture of the present invention includes a step of premixing the asphalt composition of the present invention, the recycled asphalt composition of the present invention, or a mixture thereof, and a mixing step of mixing the asphalt composition, waste asphalt concrete, and aggregate.

[0140] Specifically, the method includes a premixing step to produce an asphalt composition by blending a performance restoration substance containing new asphalt, saturated hydrocarbons of 25% by weight or less, and aromatic hydrocarbons of 60% by weight or more, having a kinematic viscosity of 80-200 cSt at 60°C and 5-40 cSt at 100°C, a difference of 75-195 between the kinematic viscosity at 60°C and the kinematic viscosity at 100°C, a specific gravity of 0.94-1.00, and a flash point higher than 250°C; and a mixing step to mix the asphalt composition, waste asphalt concrete, and aggregate.

[0141] Preferably, the premixing step according to one embodiment of the present invention is performed at a temperature of 100 to 190°C for 1 to 120 minutes, and the mixing step may be performed at a temperature of 100 to 190°C for 10 to 100 seconds.

[0142] Other embodiments of the recycled asphalt mixture of the present invention may include a mixing step of mixing the asphalt composition of the present invention, the recycled asphalt composition of the present invention, or a mixture thereof with waste asphalt concrete and aggregate.

[0143] Preferably, the mixing step according to one embodiment of the present invention may be carried out at a temperature of 100 to 190°C for 10 to 100 seconds.

[0144] The present invention will be described below with reference to examples and comparative examples for a more detailed explanation, but the present invention is not limited to the following examples.

[0145] The following physical properties were measured by the following measurement methods.

[0146] 1) Aggregate coating rate (%) after dynamic water immersion Based on the experimental method of EN-12697-11 Determination of the affinity between aggregate and bitumen. Specifically, among the aggregates described in the examples and comparative examples, 510 g of aggregates with a size of 8-11 mm and 16 g of asphalt composition were mixed at the mixing temperature described in the examples and comparative examples for 3 minutes and cooled to room temperature. Then, 150 g of the sample was taken and placed in a test glass bottle filled with water, and rotated at a speed of 60 times per minute for 24 hours. After that, the amount of asphalt coated on the aggregates was evaluated visually.

[0147] 2) ΔTc (Delta Tc, °C) Based on the experimental method of AASHTO PP78: Design Considerations When Using Reclaimed Asphalt Shingles (RAS) in Asphalt Mixtures. Specifically, the critical temperature differences (T C.S (300 MPa)-T C.m (0.300)) were calculated, and after measuring at low temperatures (-6 °C, -12 °C, 18 °C, etc.) based on the standard experimental method of AASHTO TP1: Determining the Flexural Creep Stiffness of Asphalt Binder Using the Bending Beam Rheometer (BBR), the temperature (Tc.s) at which the Creep Stiffness of the sample reached 300 MPa and the temperature (Tc.m) at which the m-value (the change amount of Creep Stiffness with time) reached 0.3 were calculated and compared and evaluated.

[0148] 3) Absolute viscosity The experimental procedure was based on ASTM D 3381. To measure the absolute viscosity of asphalt (at 60°C), a vacuum was applied in a constant-temperature bath, the time taken to pass through a predetermined section was measured, and the absolute viscosity was calculated by multiplying the time by the coefficient of that section.

[0149] 4)Kinematic viscosity The standard experimental method of ASTM D 445: Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity) was used as the basis. The absolute viscosity is calculated by dividing it by the density of the sample at its temperature.

[0150] 5) Penetration The standard experimental procedure for ASTM D 5-06: Penetration of Bituminous Materials was used as the basis. Penetration depth was defined as 1 when the needle penetrated the sample 0.1 mm with a 100 g load needle inserted for 5 seconds at 25°C. The distance between the needle's entry point was evaluated based on this standard.

[0151] 6) Flash point The standard experimental procedure for ASTM D 92-12a Flash and Fire Points by Cleveland Open Cup Tester was used as a reference. Under specified conditions, when a sample is heated, the amount of vapor generated is sufficient to form a flammable gas mixture with air on the sample surface. The temperature of the sample at which the mixture instantly burns and extinguishes while emitting a flash of light when a flame is brought near is evaluated.

[0152] 7) Specific gravity The standard experimental methods of ASTM D 70-09: Density of Semi-Solid Bituminous Materials, or ASTM D 1298-99: Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer were used as a reference. The mass value per unit volume of the sample at the measurement temperature (15°C) was evaluated and calculated by dividing it by the mass value of water per unit volume of the sample at 4°C.

[0153] 8) Dynamic stability (resistance to plastic deformation, turns / mm) The test was based on KS F 2374, "Wheel Tracking Test Method for Bituminous Pavement Mixtures." The number of test wheel passes required to deform an asphalt mixture specimen by 1 mm from the surface (over 45-60 minutes) was evaluated. The test temperature was 60°C, and the wheel load was 686 N.

[0154] 9) Toughness (crack resistance) Toughness was determined based on KS F 2382, "Indirect Tensile Strength Test Method for Asphalt Mixtures." The area over which the asphalt mixture specimen fractured during displacement-load evaluation was calculated and evaluated.

[0155] 10) Tensile strength ratio (moisture sensitivity) The test method was based on AASHTO T 283: Resistance of Compacted Asphalt Mixtures to Moisture-Induced Damage. Specifically, asphalt and aggregate were mixed at 160°C for 2 minutes, then placed in a 101.6 mm diameter mold, and compacted by rotation at 140°C to a porosity of 7% to produce test specimens. The tensile strength was then measured and compared before and after water immersion. The tensile strength was based on KS F 2382 "Indirect Tensile Strength Test Method for Asphalt Mixtures".

[0156] 11) Mixability of asphalt and aggregate The experimental method was based on AASHTO T 195-11: Determining Degree of Particle Coating of Asphalt Mixtures. Specifically, asphalt and aggregate were weighed to make an asphalt mixture weighing approximately 2.5 kg, mixed at 125°C for 2 minutes, filtered through a 9.5 mm sieve, and the percentage of coated aggregate was measured based on the total amount of coarse aggregate remaining in the sieve.

[0157] 12) Compaction properties of asphalt and aggregate The compactability test method using a swirling compaction device (SGC), as described in NCHRP Report 691 Mix Design Practices for Warm Mix Asphalt, was used as the basis. Specifically, asphalt and aggregate were mixed at 125°C for 2 minutes, then placed in a 101.6 mm diameter mold, and compacted at 115°C using a swirling compaction device until the void ratio reached 7%, with the number of compactions measured.

[0158] [Example 1] Production of performance-restoring material Atmospheric pressure residue oil is fed into a vacuum distillation unit (VDU), and a vacuum distillate containing a large amount of aromatic hydrocarbons effective in restoring the performance of waste asphalt is extracted from the vacuum distillation process to produce the performance-restoring substance of the present invention. Its physical properties are shown in Table 1 below.

[0159] [Table 1]

[0160] [Comparative Example 1] Commercial performance restoration material A commercially available performance restoration material is used, and its physical properties are shown in Table 1 above.

[0161] [Example 2] Manufacture of peeling inhibitor The anti-stripping agent was prepared by reacting 20% ​​by weight of a polyamine mixture with 80% by weight of the alkyl glycidyl ether shown in Table 2 below. The total amine content was 250 mg KOH / g, viscosity (25°C) was 7748 cSt, N / O molar ratio was 0.83, and weight-average molecular weight was 1474 g / mol.

[0162] [Table 2]

[0163] [Examples 3-4] Production of asphalt composition Using new asphalt with a penetration degree of 70 dmm as a baseline, the content of the performance restoration substance produced in Example 1 was adjusted to produce recycled high-penetration asphalt compositions with penetration degrees of 102 and 135 dmm.

[0164] Specifically, new asphalt with a penetration of 70 dmm was mixed with 5 parts by weight (Example 3) and 8 parts by weight (Example 4) of the performance-restoring substance from Example 1, based on 100 parts by weight of new asphalt. To this, 0.5 parts by weight of the peeling inhibitor (chemical formula 4) produced in Example 2 was added per 100 parts by weight of new asphalt. The mixture was then stirred at a speed of 300 rpm for 30 minutes while maintaining the temperature to produce an asphalt composition. Its physical properties were measured and are shown in Table 3 below.

[0165] [Comparative Example 2] High-penetration asphalt using a commercially available performance restoration material Except for using the commercial performance-restoring material of Comparative Example 1 instead of the performance-restoring material of Example 1 in Example 4, an asphalt composition was manufactured in the same manner as in Example 4, its physical properties were measured, and are shown in Table 3 below.

[0166] [Table 3]

[0167] As shown in Table 3, by adjusting the amount of the performance restoration substance of the present invention added, it is possible to produce high-penetration asphalt with high penetration and low viscosity. Compared to Comparative Example 2, which was produced using a commercially available performance restoration substance, this invention produces asphalt with lower viscosity for the same penetration and has excellent properties for softening waste asphalt.

[0168] [Example 5] Asphalt regeneration effect containing performance-restoring substance To simulate residual waste asphalt in waste concrete, waste asphalt was produced using a 40-hour pressure aging vessel (100°C, 20 MPa) to achieve a penetration of 22 dmm and a viscosity of 40,000 poise as a baseline.

[0169] An asphalt composition was prepared by adding the performance restoration substance and new asphalt from Example 1. To this, waste asphalt, which was prepared to simulate the aged asphalt remaining in waste asphalt concrete, was added to produce a recycled asphalt composition, which is a sample that simulates the asphalt in recycled asphalt concrete. The new asphalt was prepared by adding the performance restoration substance in an amount determined so that the viscosity would reach a level of 2000 poise (60°C) when mixed with the waste asphalt.

[0170] Specifically, a sample of 22 dmm with a penetration of 30% by weight of waste asphalt was heated to 160°C to a total of 100% by weight, and 70% by weight of new asphalt was added and mixed with the waste asphalt. 8 parts by weight of the performance restoration substance from Example 1 was mixed with 100 parts by weight of new asphalt, and 0.5 parts by weight of the peeling inhibitor (chemical formula 4) produced in Example 2 was added to this mixture. The mixture was then stirred at a speed of 300 rpm for 30 minutes while maintaining the temperature to produce a recycled asphalt composition.

[0171] The physical properties of the manufactured recycled asphalt composition were measured and are shown in Table 4 below.

[0172] [Comparative Example 3] In Example 5, a recycled asphalt composition was produced in the same manner as in Example 5, except that the waste asphalt and performance restoration substance produced in Example 1 were not added. The physical properties of the new, unaged asphalt were measured and are shown in Table 4 below.

[0173] [Comparative Example 4] Except for using the commercial performance restoration material of Comparative Example 1 instead of the performance restoration material of Example 1 in Example 5, a recycled asphalt composition was manufactured in the same manner as in Example 5, and its physical properties were measured and are shown in Table 4 below.

[0174] [Table 4]

[0175] Table 4 above shows that the recycled asphalt composition of the present invention has equivalent or superior physical properties to the novel asphalt mixture (Comparative Example 3). The recycled asphalt composition of the present invention contains performance-restoring materials with specific components and their controlled content, resulting in a ΔTc (flexibility index) at the novel asphalt level, as researched and reported in the United States. This demonstrates that the recycled asphalt composition of the present invention has extremely superior regeneration capabilities.

[0176] Specifically, the recycled asphalt composition of the present invention, by containing the specific performance-restoring substance of the present invention, has high penetration, good miscibility with other components, excellent crack resistance, and is environmentally friendly.

[0177] Furthermore, it has been found that the recycled asphalt composition of the present invention, by containing a specific peeling inhibitor, exhibits remarkably improved water resistance.

[0178] [Example 6] Production of recycled asphalt test specimens using recycled asphalt mixture A recycled asphalt test piece mixture satisfying WC-3 particle size was prepared by mixing 2.76% by weight of a high-penetration asphalt composition using the performance restoration material of Example 4, 30.00% by weight of site-spent waste asphalt (waste asphalt viscosity: 24,000 poise), and 67.24% by weight of new aggregate and limestone filler at 160°C.

[0179] The waste asphalt concrete used meets the quality standards for recycled aggregate according to KS F 2572, the aggregate used meets the aggregate standards according to KS F 2357, and the limestone filler meets the filler standards according to KS F 3501. The WC-3 grade is a standard presented by the Korean Ministry of Land, Infrastructure and Transport, and is a dense-graded asphalt mixture of 20 mm nominal maximum aggregate size.

[0180] The recycled asphalt test specimen mixture was compacted at 145°C to produce asphalt test specimens, and their physical properties were measured as described above, as shown in Table 5 below.

[0181] [Comparative Example 5] Except for using the asphalt composition of Comparative Example 4, which contains a commercial performance restoration substance, instead of the asphalt composition of Example 4 in Example 6, test specimens were prepared and their physical properties were measured in the same manner as in Example 6, and the results are shown in Table 5 below.

[0182] [Table 5]

[0183] [Table 6]

[0184] The recycled asphalt mixture of the present invention, by including the performance-restoring substance and the peeling inhibitor of the present invention, exhibits significantly improved values ​​in terms of plastic deformation resistance, crack resistance, moisture sensitivity, viscosity recovery, as well as mixability and compaction properties, compared to recycled asphalt mixtures containing the commercially available performance-restoring substance.

Claims

1. New asphalt, peeling prevention agent, It contains saturated hydrocarbons at a concentration of 25% by weight or less and aromatic hydrocarbons at a concentration of 60% by weight or more. The kinematic viscosity is 80-200 cSt at 60°C and 5-40 cSt at 100°C, and the difference between the kinematic viscosity at 60°C and 100°C is 75-195. An asphalt composition comprising a performance-restoring substance having a specific gravity of 0.94 to 1.00 and a flash point higher than 250°C.

2. The asphalt composition according to claim 1, wherein the performance-restoring substance comprises 0.1 to 20 parts by weight per 100 parts by weight of new asphalt.

3. The asphalt composition according to claim 1, wherein the peeling inhibitor comprises 0.01 to 2 parts by weight per 100 parts by weight of new asphalt.

4. The asphalt composition according to claim 1, wherein the peeling inhibitor is a compound comprising a repeating unit of the following chemical formula 1, and at least one of its terminal groups comprises the following chemical formula 2. [Chemical formula 1] 【Chemistry 1】 [Chemical formula 2] 【Chemistry 2】 In the aforementioned chemical formulas 1 and 2, A is selected from hydrogen or the aforementioned chemical formula 2. R １ It is a C1-C30 alkyl group.

5. The asphalt composition according to claim 1, wherein the penetration (1 / 10 mm, 25°C, 100 g, 5 seconds) is 100 to 170 d mm and the absolute viscosity (60°C) is 600 to 1,500 poise.

6. A recycled asphalt composition comprising the asphalt composition according to any one of claims 1 to 5 and waste asphalt.

7. The recycled asphalt composition according to claim 6, wherein the penetration (1 / 10 mm, 25°C, 100 g, 5 seconds) is 60 to 80 d mm and the absolute viscosity (60°C) is 1500 to 2200 poise.

8. T ｃ．ｓ (300MPa)-T ｃ．ｍ (0.300) value (where T ｃ．ｓ (300 MPa) is the temperature at which the Creep Stiffness of the sample reaches 300 MPa. ｃ．ｍ The recycled asphalt composition according to claim 6, wherein the temperature at which the amount of change in Creep Stiffness over time becomes 0.3 is 1.8°C or higher.

9. A recycled asphalt mixture comprising the asphalt composition according to any one of claims 1 to 5, the recycled asphalt composition according to claim 6, or a mixture thereof, waste asphalt concrete, and aggregate.

10. A step of premixing the asphalt composition according to any one of claims 1 to 5, the recycled asphalt composition according to claim 6, or a mixture thereof, A method for producing a recycled asphalt mixture, comprising the step of mixing waste asphalt concrete and aggregate into the composition premixed in the above step.

11. The method for producing a recycled asphalt mixture according to claim 10, wherein the premixing step is performed at a temperature of 100 to 190°C for 1 to 120 minutes, and the mixing step is performed at a temperature of 100 to 190°C for 10 to 100 seconds.

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