A kind of high modulus asphalt concrete and preparation method thereof

Abstract

The invention discloses a method for preparing high modulus asphalt concrete, which comprises the following steps: S1: weighing a certain amount of artificial aggregate with a core-shell structure, adding it to the aggregate and heating it, and putting the heated mixture into a preheated mixing pot for dry mixing; S2: spraying asphalt and an organic viscosity-reducing warm-mix additive into the mixing pot of step S1 and mixing them with the preheated mixture; S3: pausing the mixing, pouring in an admixture, fiber, nanofiller, rubber powder and water, and continuing to mix until the mixture is uniform, to obtain the asphalt concrete. The high modulus asphalt concrete prepared by the invention has a dynamic modulus of up to 9000-12000MPa, and not only has excellent rutting resistance and fatigue resistance, but also has optimized construction performance and environmental adaptability, and at the same time realizes the recycling of waste resources, thereby meeting the needs of modern road engineering for high-performance, sustainable and environmentally friendly paving materials.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt concrete, and in particular to a high modulus asphalt concrete and a preparation method thereof. Background Art

[0002] In modern road engineering, asphalt concrete is a widely used pavement material, and its performance directly affects the service life and maintenance cost of the road. However, the asphalt concrete of the existing technology often encounters problems such as insufficient modulus, weak deformation resistance, and easy rutting and fatigue cracking under high load and repeated traffic load. These problems not only reduce the performance of the road, but also increase the long-term maintenance and repair costs. In addition, the construction performance and environmental adaptability of traditional asphalt concrete need to be improved, especially under extreme climatic conditions, the stability and durability of material properties face challenges.

[0003] With the increasing popularity of environmental protection and sustainable development concepts, how to recycle waste resources and transform them into new materials with practical value has become a research hotspot in the field of materials science and engineering. In the field of asphalt concrete, the use of waste mineral materials to prepare artificial aggregates can not only reduce the exploitation of natural resources, but also reduce the environmental burden and realize the reuse of waste.

[0004] In view of these challenges, the road engineering field urgently needs to develop new asphalt concrete materials, which should have higher modulus and deformation resistance to meet the growing traffic load requirements. At the same time, new materials should also have better construction performance and environmental adaptability, and take environmental protection and sustainability into consideration in design and construction. These demands have promoted the continuous research and innovation of asphalt concrete material technology. Summary of the invention

[0005] In view of the above shortcomings of the prior art, the present invention provides a high modulus asphalt concrete to solve technical problems such as how to improve the modulus and deformation resistance of asphalt concrete, enhance rutting resistance and fatigue resistance, optimize construction performance and environmental adaptability, and realize resource utilization of waste.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A method for preparing high modulus asphalt concrete, the preparation method comprising the following steps:

[0008] S1: Weigh a certain amount of artificial aggregate with a core-shell structure, add it to the aggregate and heat it, put the heated mixture into a preheated mixing pot for dry mixing; control the dry mixing temperature to 125-145°C;

[0009] S2: spraying asphalt and organic viscosity-reducing warm mix additive into the mixing pot of step S1 and mixing with the preheated mixture;

[0010] S3: Pause the mixing, pour in the admixture, fiber, nano filler, rubber powder and water, and continue to mix until the mixture is uniform to obtain the asphalt concrete.

[0011] As a preferred technical solution, in the mixture of step S1, the mass ratio of the artificial aggregate with a core-shell structure to the aggregate is 20-30:70-80; in step S2, the added amount of the organic viscosity-reducing warm mix additive is 0.3-0.6% relative to the mass of the mixture of step S1; in step S3, the added amounts of the admixture, fiber, nanofiller, rubber powder and water are 1-3%, 0.05-0.15%, 0.5-1.5%, 2-5% and 0.5-2% respectively relative to the mass of the mixture of step S1.

[0012] As a preferred technical solution, the artificial aggregate with a core-shell structure is an artificial aggregate prepared by high-temperature calcination of a raw material prepared from waste mineral granules and slurry as a core layer, and then an organic / inorganic composite whisker is coated as an outer shell layer by an in-situ reaction outside the core layer through a sol-gel method. The artificial aggregate structure with a core-shell structure of the present invention significantly improves the mechanical properties of the material, such as hardness, strength and wear resistance, while enhancing the interfacial bonding force between the artificial aggregate and asphalt, and improving the overall adhesion and cohesion of the asphalt concrete, so that the asphalt concrete of the present invention has excellent rutting resistance and fatigue resistance, and enhances the structural integrity and stability of the material under repeated traffic loads. In addition, the use of waste resources as raw materials not only reduces dependence on natural resources, but also realizes the resource utilization of waste, which is in line with the concepts of environmental protection and sustainable development.

[0013] As a preferred technical solution, the waste mineral granules are at least one of waste ceramic tiles, feldspar, kaolin and clay.

[0014] As a preferred technical solution, the organic / inorganic composite whiskers specifically use tetrabutyl titanate or tetraisopropyl titanate as inorganic precursors and methyl methacrylate monomer as organic precursors, first gradually undergo sol-gel reaction through hydrolysis and polymerization reactions, then undergo high-temperature heat treatment after aging and drying, and finally obtain PMMA (polymethyl methacrylate) / titanium dioxide composite whiskers through surface modification.

[0015] The PMMA / titanium dioxide composite whisker prepared in this way has high refractive index and photocatalytic performance of titanium dioxide and high transparency and glossiness of PMMA, which, on the one hand, contribute to the self-cleaning of the asphalt concrete surface, and on the other hand, the two synergistically improve the appearance and aesthetics of the material. At the same time, the weather resistance of titanium dioxide and PMMA makes the material more resistant to erosion by ultraviolet rays and adverse weather conditions.

[0016] As a preferred technical solution, the organic viscosity-reducing warm-mix additive is prepared by compounding long-chain aliphatic hydrocarbons, polyvinyl pyrrolidone, fatty acids, and amphoteric surfactants.

[0017] As a preferred technical solution, the external admixture is at least one of cement, fly ash and silica fume.

[0018] As a preferred technical solution, the fiber is at least one of polypropylene fiber, polyester fiber, and carbon fiber.

[0019] As a preferred technical solution, the nano filler is at least one of nano carbon black, nano calcium carbonate, nano silicon dioxide and nano zinc oxide.

[0020] Another aspect of the present invention is to provide a high modulus asphalt concrete, which is prepared by the above-mentioned method for preparing high modulus asphalt concrete, wherein the dynamic modulus of the asphalt concrete reaches 9000-12000 MPa.

[0021] The present invention proposes a method for preparing high modulus asphalt concrete, which significantly improves the overall modulus and deformation resistance of asphalt concrete by innovatively adding artificial aggregates with a core-shell structure to the aggregate. The artificial aggregate of the present invention is composed of waste mineral granules and organic / inorganic composite whiskers, which not only enhances the stability and durability of the material, but also realizes the recycling of waste resources. The present invention controls the addition amount of organic viscosity-reducing warm mix additives, admixtures, fibers, nanofillers, rubber powder and water, on the one hand, further improves the dynamic modulus of asphalt concrete, and on the other hand, optimizes the construction performance of asphalt concrete and improves its crack resistance and toughness. In addition, the asphalt concrete of the present invention exhibits excellent environmental adaptability, and the performance can be adjusted according to different engineering requirements and environmental conditions.

[0022] The high modulus asphalt concrete prepared by the present invention has a dynamic modulus of 9000-12000 MPa. The asphalt concrete of the present invention has excellent elasticity and recovery ability when subjected to repeated loads, and is particularly suitable for road projects subjected to high loads and high traffic flows.

[0023] Beneficial effects of the present invention:

[0024] The high modulus asphalt concrete preparation method of the present invention effectively improves the dynamic modulus and deformation resistance of asphalt concrete by adding artificial aggregate with a core-shell structure to the aggregate. The artificial aggregate is composed of a core layer of waste mineral granules, and the outer layer is an organic / inorganic composite whisker, which not only significantly enhances the hardness, strength and wear resistance of the material, but also enhances the interfacial bonding force with asphalt, thereby giving the asphalt concrete excellent rutting resistance and fatigue resistance, and the introduction of PMMA / titanium dioxide composite whiskers not only enhances the weather resistance and self-cleaning ability of the material, but also enhances the aesthetics. In addition, the present invention further improves the dynamic modulus of asphalt concrete by accurately controlling the ratio of additives, such as organic viscosity-reducing warm mix additives, admixtures, fibers, nanofillers, rubber powder and water, and optimizes the properties such as construction performance, crack resistance and toughness. The present invention also actively responds to the concepts of environmental protection and sustainable development, and realizes the resource utilization of waste by using waste resources as raw materials. DETAILED DESCRIPTION

[0025] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0026] Example 1

[0027] The method for preparing high modulus asphalt concrete in this embodiment comprises the following steps:

[0028] S1: Weigh a certain amount of artificial aggregate with a core-shell structure, add it to the aggregate and heat it. The aggregate is composed of coarse aggregate (limestone crushed stone with a particle size of 9.5 mm to 19 mm) and fine aggregate (river sand with a fineness modulus FM of 2.5 to 2.7) mixed in a mass ratio of 50:50. Put the heated mixture into a preheated mixing pot for dry mixing; control the dry mixing temperature to be 145° C.; the mass ratio of the artificial aggregate with a core-shell structure to the aggregate is 30:70.

[0029] The artificial aggregate with core-shell structure is prepared by high-temperature calcination of a raw material prepared from waste mineral granules and slurry as a core layer, and then an organic / inorganic composite whisker is in-situ reacted and coated as an outer shell layer outside the core layer by a sol-gel method. Specifically, the following steps are included:

[0030] S101 Preparation of artificial aggregate: First, 450g of high-alumina clinker was fully stirred with 550mL of water until they were evenly mixed to form a uniform slurry without granular substances. Next, 200g of discarded tiles and 150g of discarded feldspar (total weight 350g) were selected and evenly mixed with the slurry prepared above to ensure that the mineral particles were evenly distributed in the slurry. Subsequently, the mixed mixture was placed in a high-temperature furnace and calcined at 1050°C for 4h. After calcination, the sintered body was taken out and naturally cooled to room temperature. Then, a grinder was used for grinding until the desired particle size was reached, and sieved through a sieve to obtain the artificial aggregate with a particle size range of 5.5mm to 9.5mm.

[0031] S102 Preparation of core-shell structure: First, 200g of the artificial aggregate prepared in step S101 is uniformly dispersed in 500mL of water and stirred at 2000rpm for 30min; then, 0.1mol of tetrabutyl titanate is added as an inorganic precursor, the pH value is adjusted to 3.5, and the solution is kept at 50°C for 30min to complete the hydrolysis of tetrabutyl titanate to obtain a sol; then, 0.1mol of methyl methacrylate monomer is added as an organic precursor, and 0.05g of benzoyl peroxide is added as an initiator, and a polymerization reaction is carried out at 60°C for 3h. After the polymerization reaction is completed, the solution is allowed to stand at room temperature for 24h to form a gel; after aging and drying, annealing treatment is carried out in a nitrogen atmosphere at 800°C for 2h, and finally, a silane coupling agent KH560 is added for chemical surface modification to obtain the artificial aggregate with a core-shell structure, that is, the artificial aggregate is the core layer, and the PMMA / titanium dioxide composite whisker is the outer shell layer. The amount of the silane coupling agent added is 0.1% of the mass of the artificial aggregate.

[0032] S2: Spray 20# asphalt and organic viscosity-reducing warm mix additive into the mixing pot of step S1 and mix with the preheated mixture; the organic viscosity-reducing warm mix additive is compounded with long-chain aliphatic hydrocarbon (n-dodecane), polyvinyl pyrrolidone, fatty acid (oleic acid), and amphoteric surfactant (dodecyl dimethyl betaine) in a mass ratio of 40:30:20:10. The amount of asphalt added is 5% relative to the mass of the mixture in step S1. The amount of organic viscosity-reducing warm mix additive added is 0.3% relative to the mass of the mixture in step S1.

[0033] S3: Pause mixing, pour in cement admixture, polypropylene fiber, nano carbon black, rubber powder and water, and continue to mix until the mixture is uniform to obtain the asphalt concrete. The addition amount of cement admixture, polypropylene fiber, nano carbon black, rubber powder and water is 1%, 0.15%, 0.8%, 2% and 2% of the mass of the mixture in step S1, respectively.

[0034] Example 2

[0035] The method for preparing high modulus asphalt concrete in this embodiment comprises the following steps:

[0036] S1: Weigh a certain amount of artificial aggregate with a core-shell structure, add it to the aggregate and heat it. The aggregate is composed of coarse aggregate (limestone crushed stone with a particle size of 9.5 mm to 19 mm) and fine aggregate (river sand with a fineness modulus FM of 2.5 to 2.7) mixed in a mass ratio of 50:50. Put the heated mixture into a preheated mixing pot for dry mixing; control the dry mixing temperature to be 135° C.; the mass ratio of the artificial aggregate with a core-shell structure to the aggregate is 25:75.

[0037] The artificial aggregate with core-shell structure is prepared by high-temperature calcination of a raw material prepared from waste mineral granules and slurry as a core layer, and then an organic / inorganic composite whisker is in-situ reacted and coated as an outer shell layer outside the core layer by a sol-gel method. Specifically, the following steps are included:

[0038] S101 Preparation of artificial aggregate: First, 500g of high-alumina clinker was fully stirred with 500mL of water until they were evenly mixed to form a uniform slurry without granular substances. Next, 250g of discarded tiles and 150g of discarded kaolin (total weight 400g) were selected and evenly mixed with the slurry prepared above to ensure that the mineral particles were evenly distributed in the slurry. Subsequently, the mixed mixture was placed in a high-temperature furnace and calcined at 1100°C for 3h. After calcination, the sintered body was taken out and naturally cooled to room temperature. Then, a grinder was used for grinding until the desired particle size was reached, and sieved through a sieve to obtain the artificial aggregate with a particle size range of 5.5mm to 9.5mm.

[0039] S102 Preparation of core-shell structure: First, 200g of the artificial aggregate prepared in step S101 is uniformly dispersed in 500mL of water and stirred at 2000rpm for 30min; then, 0.1mol of tetrabutyl titanate is added as an inorganic precursor, the pH value is adjusted to 4, and the solution is kept at 50°C for 30min to complete the hydrolysis of tetrabutyl titanate to obtain a sol; then, 0.1mol of methyl methacrylate monomer is added as an organic precursor, and 0.05g of benzoyl peroxide is added as an initiator, and a polymerization reaction is carried out at 60°C for 3.5h. After the polymerization reaction is completed, the solution is allowed to stand at room temperature for 24h to form a gel; after aging and drying, annealing treatment is carried out in a nitrogen atmosphere at 780°C for 2h, and finally, a silane coupling agent KH560 is added for chemical surface modification to obtain the artificial aggregate with a core-shell structure, that is, the artificial aggregate is the core layer, and the PMMA / titanium dioxide composite whisker is the outer shell layer. The amount of the silane coupling agent added is 0.3% of the mass of the artificial aggregate.

[0040] S2: Spray 20# asphalt and organic viscosity-reducing warm mix additive into the mixing pot of step S1 and mix with the preheated mixture; the organic viscosity-reducing warm mix additive is compounded with long-chain aliphatic hydrocarbon (n-dodecane), polyvinyl pyrrolidone, fatty acid (oleic acid), and amphoteric surfactant (dodecyl dimethyl betaine) in a mass ratio of 50:25:17:8. The amount of asphalt added is 5.5% relative to the mass of the mixture in step S1. The amount of organic viscosity-reducing warm mix additive added is 0.4% relative to the mass of the mixture in step S1.

[0041] S3: Pause mixing, pour in fly ash, polyester fiber, nano calcium carbonate, rubber powder and water as external admixtures, and continue mixing until the mixture is uniform to obtain the asphalt concrete. The addition amounts of fly ash, polyester fiber, nano calcium carbonate, rubber powder and water as external admixtures are 2%, 0.1%, 1.2%, 3% and 1.5% of the mass of the mixture in step S1, respectively.

[0042] Example 3

[0043] The method for preparing high modulus asphalt concrete in this embodiment comprises the following steps:

[0044] S1: Weigh a certain amount of artificial aggregate with a core-shell structure, add it to the aggregate and heat it. The aggregate is composed of coarse aggregate (limestone crushed stone with a particle size of 9.5 mm to 19 mm) and fine aggregate (river sand with a fineness modulus FM of 2.5 to 2.7) mixed in a mass ratio of 50:50. Put the heated mixture into a preheated mixing pot for dry mixing; control the dry mixing temperature to 140° C.; the mass ratio of the artificial aggregate with a core-shell structure to the aggregate is 20:80.

[0045] The artificial aggregate with core-shell structure is prepared by high-temperature calcination of a raw material prepared from waste mineral granules and slurry as a core layer, and then an organic / inorganic composite whisker is in-situ reacted and coated as an outer shell layer outside the core layer by a sol-gel method. Specifically, the following steps are included:

[0046] S101 Preparation of artificial aggregate: First, 550g of high-alumina clinker was fully stirred with 450mL of water until they were evenly mixed to form a uniform slurry without granular substances. Next, 300g of discarded tiles and 100g of discarded clay (total weight 400g) were selected and evenly mixed with the slurry prepared above to ensure that the mineral particles were evenly distributed in the slurry. Subsequently, the mixed mixture was placed in a high-temperature furnace and calcined at 1150°C for 2h. After calcination, the sintered body was taken out and naturally cooled to room temperature. Then, a grinder was used for grinding until the desired particle size was reached, and sieved through a sieve to obtain the artificial aggregate with a particle size range of 5.5mm to 9.5mm.

[0047] S102 Preparation of core-shell structure: First, 200g of the artificial aggregate prepared in step S101 is uniformly dispersed in 500mL of water and stirred at 2000rpm for 30min; then, 0.1mol of tetraisopropyl titanate is added as an inorganic precursor, the pH value is adjusted to 3.8, and the solution is kept at 60°C for 45min to complete the hydrolysis of tetraisopropyl titanate to obtain a sol; then, 0.1mol of methyl methacrylate monomer is added as an organic precursor, and 0.05g of benzoyl peroxide is added as an initiator, and a polymerization reaction is carried out at 60°C for 4h. After the polymerization reaction is completed, the solution is allowed to stand at room temperature for 24h to form a gel; after aging and drying, annealing treatment is carried out in a nitrogen atmosphere at 750°C for 2h, and finally, a silane coupling agent KH560 is added for chemical surface modification to obtain the artificial aggregate with a core-shell structure, that is, the artificial aggregate is the core layer, and the PMMA / titanium dioxide composite whisker is the outer shell layer. The addition amount of the silane coupling agent is 0.5% of the mass of the artificial aggregate.

[0048] S2: Spray 30# asphalt and organic viscosity-reducing warm mix additive into the mixing pot of step S1 and mix with the preheated mixture; the organic viscosity-reducing warm mix additive is compounded with long-chain aliphatic hydrocarbon (n-dodecane), polyvinyl pyrrolidone, fatty acid (oleic acid), and amphoteric surfactant (dodecyl dimethyl betaine) in a mass ratio of 60:20:15:5. The amount of asphalt added is 6% relative to the mass of the mixture in step S1. The amount of organic viscosity-reducing warm mix additive added is 0.6% relative to the mass of the mixture in step S1.

[0049] S3: Pause mixing, pour in external admixtures of silica fume, carbon fiber, nano-silicon dioxide, rubber powder and water, and continue mixing until the mixture is uniform to obtain the asphalt concrete. The addition amounts of the external admixtures of silica fume, carbon fiber, nano-silicon dioxide, rubber powder and water are 3%, 0.15%, 0.5%, 3% and 2% respectively relative to the mass of the mixture in step S1.

[0050] Comparative Example 1

[0051] The raw material composition and preparation steps of the high modulus asphalt concrete of this comparative example are basically the same as those of Example 1, except that, in the preparation method of the high modulus asphalt concrete of this comparative example, artificial aggregate with a core-shell structure is not added to the aggregate.

[0052] Comparative Example 2

[0053] The raw material composition and preparation steps of the high modulus asphalt concrete in this comparative example are basically the same as those in Example 1, except that, in the preparation method of the high modulus asphalt concrete in this comparative example, the artificial aggregate prepared in step S101 has not been modified in step S102, that is, it does not have an outer shell layer of PMMA / titanium dioxide composite whiskers.

[0054] Comparative Example 3

[0055] The raw material composition and preparation steps of the high modulus asphalt concrete of this comparative example are basically the same as those of Example 1, except that, in the preparation method of the high modulus asphalt concrete of this comparative example, no organic viscosity-reducing warm mix additive is added in step S2.

[0056] The high modulus asphalt concrete prepared in Examples 1 to 3 and Comparative Examples 1 to 3 was subjected to performance tests, and the performance results are shown in Table 1:

[0057] Among them, the dynamic modulus performance test was carried out with reference to GB / T36143-2018 "High modulus anti-fatigue asphalt mixture for roads", with a test temperature of 45°C and a loading frequency of 10Hz.

[0058] The rutting resistance test refers to AASHTO T 324 (wheel rolling rutting test). By simulating the impact of traffic load on asphalt concrete pavement and measuring the rutting depth, the anti-rutting performance is evaluated.

[0059] Durability test method: Evaluated through freeze-thaw cycle test, freezing temperature is -18℃, melting temperature is +20℃, and specific reference is made to "Concrete Durability Test Method" (GB / T 50082-2009) for testing. Durability evaluation is based on the dynamic modulus retention rate of the material after 50 cycles of testing.

[0060] Chemical resistance test method: artificial accelerated aging test is carried out through salt spray test (prepared with 5% NaCl solution), and the dynamic modulus retention rate of the sample after continuous testing for 96 hours is evaluated.

[0061] Heat aging resistance test: Accelerated aging test was carried out at 85°C and relative humidity of 85%. After 168 hours of testing, the dynamic modulus retention of the sample was used for evaluation.

[0062] Table 1

[0063]

[0064]

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A method for preparing high modulus asphalt concrete, characterized in that: The preparation method comprises the following steps: S1: Weigh a certain amount of artificial aggregate with a core-shell structure, add it to the aggregate and heat it, and put the heated mixture into a preheated mixing pot for dry mixing; S2: spraying asphalt and organic viscosity-reducing warm mix additive into the mixing pot of step S1 and mixing with the preheated mixture; S3: Pause the mixing, pour in the admixture, fiber, nano filler, rubber powder and water, and continue to mix until the mixture is uniform, thereby obtaining the asphalt concrete; The artificial aggregate with a core-shell structure is prepared by high-temperature calcination of a raw material prepared from waste mineral granules and slurry as a core layer, and then an organic / inorganic composite whisker is in-situ coated on the outside of the core layer as an outer shell layer by a sol-gel method; the organic / inorganic composite whisker is specifically prepared by using tetrabutyl titanate or tetraisopropyl titanate as an inorganic precursor and methyl methacrylate monomer as an organic precursor, firstly undergoing sol-gelization through hydrolysis and polymerization reactions, then undergoing high-temperature heat treatment after aging and drying, and finally being obtained by surface modification; the organic viscosity-reducing warm-mix additive is prepared by compounding long-chain aliphatic hydrocarbons, polyvinyl pyrrolidone, fatty acids, and amphoteric surfactants.

2. The method for preparing high modulus asphalt concrete according to claim 1, characterized in that: In the mixture of step S1, the mass ratio of the artificial aggregate with a core-shell structure to the aggregate is 20-30:70-80; in step S2, the added amount of the organic viscosity-reducing warm mix additive is 0.3-0.6% relative to the mass of the mixture of step S1; in step S3, the added amounts of the admixture, fiber, nanofiller, rubber powder and water are 1-3%, 0.05-0.15%, 0.5-1.5%, 2-5% and 0.5-2% respectively relative to the mass of the mixture of step S1.

3. The method for preparing high modulus asphalt concrete according to claim 1, characterized in that: The waste mineral granules are at least one of waste ceramic tiles, feldspar, kaolin and clay.

4. The method for preparing high modulus asphalt concrete according to claim 1, characterized in that: The external admixture is at least one of cement, fly ash and silica fume.

5. The method for preparing high modulus asphalt concrete according to claim 1, characterized in that: The fiber is at least one of polypropylene fiber, polyester fiber and carbon fiber.

6. The method for preparing high modulus asphalt concrete according to claim 1, characterized in that: The nano filler is at least one of nano carbon black, nano calcium carbonate, nano silicon dioxide and nano zinc oxide.

7. A high modulus asphalt concrete, characterized in that The asphalt concrete is prepared by the preparation method of high modulus asphalt concrete as described in any one of claims 1 to 6, wherein the dynamic modulus of the asphalt concrete reaches 9000 to 12000 MPa.

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