Highly anti-spreading drainage asphalt mixture and preparation method thereof

Abstract

The application discloses a kind of high anti-sputtering drainage asphalt mixture and preparation method thereof, it is related to bitumen technical field.The raw materials of asphalt mixture include matrix asphalt, styrene-butadiene-styrene block copolymer, butyronitrile rubber microsphere, carboxyl silicone oil, composite modified aggregate, composite additive, graphene oxide mixed solution, calcium lactate.The preparation method of asphalt mixture includes the steps of composite modified aggregate preparation, preparation of graphene oxide mixed solution, preparation of composite additive, and preparation of asphalt mixture.The drainage asphalt mixture prepared by the application has strong anti-sputtering performance, excellent drainage performance and good anti-rutting performance.

Description

Technical Field

[0001] This invention relates to the field of asphalt technology, specifically to a high-diffuse-resistant drainage asphalt mixture and its preparation method. Background Technology

[0002] Drainage asphalt mixtures, due to their interconnected porous structure, can quickly drain rainwater from the road surface, effectively solving problems such as road surface water accumulation and hydroplaning. They also significantly improve anti-skid performance and visibility during rainy weather, and are widely used in the construction of high-grade highways. Current technologies primarily improve their road performance by adding polymer modifiers and optimizing aggregate gradation, but many technical bottlenecks still exist.

[0003] In existing technologies, the traditional aggregate-asphalt interface relies solely on physical adsorption, resulting in weak bond strength. Under complex environments such as vehicle loads and freeze-thaw cycles, it is prone to delamination and spalling. The high-porosity structures used to improve drainage further exacerbate the insufficient water resistance. Some technologies improve water resistance by adding hydrophobic modifiers, but this can conflict with rutting resistance. Furthermore, nano-modifiers tend to agglomerate in asphalt, hindering their synergistic strengthening effect. Simultaneously, poor compatibility and easy separation of components during construction lead to poor mixture stability, severely impacting pavement service life. Existing technology CN106630731A discloses a composite modifier and its preparation of drainage asphalt concrete with high anti-spilling properties. While this prior art uses an SBS modifier, SBR modifier, and solubilizer as its basic modifier material, solving the problems of uneven fiber dispersion and modified asphalt segregation during storage, the aggregate-asphalt interface relies solely on conventional physical adsorption, resulting in weak bonding, and lacks specific design for rutting resistance.

[0004] In summary, although the existing technical solutions have improved some properties of asphalt mixtures to a certain extent, the following technical problems still exist: poor anti-scattering performance, insufficient drainage performance, and poor rutting resistance. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a high anti-scattering drainage asphalt mixture and its preparation method, and achieves the following objectives: to prepare a drainage asphalt mixture with strong anti-scattering performance, excellent drainage performance and good rutting resistance.

[0006] To achieve the above objectives, the following technical solution is adopted:

[0007] A highly resistant, non-scattering drainage asphalt mixture, by weight, comprises the following raw materials: 90-100 parts of base asphalt, 4-6 parts of styrene-butadiene-styrene block copolymer, 2-4 parts of nitrile rubber microspheres, 8-10 parts of carboxylated silicone oil, 450-500 parts of composite modified aggregate, 2.5-3 parts of composite additives, 56-59 parts of graphene oxide mixed solution, and 7-9 parts of calcium lactate.

[0008] The base asphalt is selected from 70# or 90# Grade A road petroleum asphalt.

[0009] The particle size of the nitrile rubber microspheres is 20-60 μm.

[0010] The viscosity (25℃) of the carboxylated silicone oil is 1000-3500 mPa·s, and the content of active ingredients is ≥98%.

[0011] The styrene-butadiene-styrene block copolymer is selected from Baling YH-791.

[0012] The present invention also provides a method for preparing a high-diffuse-resistant drainage asphalt mixture, comprising the steps of preparing composite modified aggregate, preparing graphene oxide mixed solution, preparing composite additives, and obtaining asphalt mixture.

[0013] The composite modified aggregate is prepared as follows: Tannic acid and sodium carbonate are added to deionized water and stirred until completely dissolved. The pH value of the solution is adjusted to obtain a tannic acid-sodium carbonate buffer solution. Basalt, manufactured sand, and limestone powder are mixed evenly and dried. Then, the mixture is immersed in the tannic acid-sodium carbonate buffer solution and stirred. After filtration and drying, 3-aminopropyltriethoxysilane is added, stirred, and cooled to obtain the composite modified aggregate.

[0014] Furthermore, the mass ratio of tannic acid, sodium carbonate, and deionized water is (3-4):(2-3):500; the mass ratio of basalt, manufactured sand, and limestone powder is (88-92):(3-5):(3-5); the particle size of the basalt is 5-15 mm, the particle size of the manufactured sand is 0.15-5 mm, and the particle size of the limestone powder is ≤0.075 mm.

[0015] Furthermore, the drying process involves a temperature of 105-110℃ and a time of 4-5 hours; the amount of 3-aminopropyltriethoxysilane used is 0.2-0.3% of the total mass of basalt, manufactured sand, and limestone mineral powder.

[0016] Furthermore, the preparation of the composite modified aggregate involves adding tannic acid and sodium carbonate to deionized water, stirring until completely dissolved, and then adding sodium bicarbonate to adjust the pH of the solution to 8.8-9.0 to obtain a tannic acid-sodium carbonate buffer solution.

[0017] Basalt, manufactured sand, and limestone powder are mixed evenly and dried. Then, they are immersed in a tannic acid-sodium carbonate buffer solution at 60-65℃ for 2.5-3 hours with a stirring speed of 300-400 rpm. After filtration, they are dried again, and then 3-aminopropyltriethoxysilane is added. The temperature is controlled at 55-60℃, and the mixture is stirred for 1-1.5 hours with a stirring speed of 250-300 rpm. After cooling, the composite modified aggregate is obtained.

[0018] The preparation of the graphene oxide mixed solution involves adding potassium carbonate to deionized water, stirring until dissolved, then adding graphene oxide, and ultrasonically treating the solution to obtain the graphene oxide mixed solution.

[0019] Furthermore, the mass ratio of potassium carbonate, graphene oxide, and deionized water is (5-7):(0.8-1.2):50; the ultrasonic treatment has an ultrasonic power of 300-400W and an ultrasonic time of 30-40min.

[0020] The composite additive is prepared by mixing nano-silica, perfluorooctyltriethoxysilane, and polyamide wax, heating, melting and stirring, cooling and then pulverizing to obtain the composite additive.

[0021] Furthermore, the pulverization is carried out by pulverizing to a particle size ≤ 5 μm; the mass ratio of the nano silica, perfluorooctyltriethoxysilane and polyamide wax is (10-12):(2-3):(5-6).

[0022] Furthermore, the preparation of the composite additive involves mixing nano-silica, perfluorooctyltriethoxysilane, and polyamide wax, heating the mixture to 120-125°C, stirring it for 30-40 minutes at a speed of 400-500 rpm, cooling it, and then pulverizing it to obtain the composite additive.

[0023] The asphalt mixture is prepared by: placing the base asphalt into a mixing tank, heating and stirring, then adding styrene-butadiene-styrene block copolymer and nitrile rubber microspheres, and stirring; then adding carboxylated silicone oil and composite additives, and stirring; while stirring, adding graphene oxide mixed solution, then adding calcium lactate, and stirring; finally adding composite modified aggregate, and stirring; controlling the discharge temperature, and cooling to obtain the asphalt mixture.

[0024] Further, the asphalt mixture is prepared as follows: Base asphalt is placed in a mixing tank, heated to 160-170℃, and stirred for 30-40 minutes at a speed of 200-300 rpm. Then, styrene-butadiene-styrene block copolymer and nitrile rubber microspheres are added, and stirred for 50-60 minutes at a speed of 500-600 rpm. Next, carboxyl silicone oil and composite additives are added, and the temperature is controlled at 155-160℃, and the mixture is stirred for 30-40 minutes at a speed of 450-500 rpm. While stirring, a graphene oxide mixed solution is added, followed by calcium lactate, and the temperature is controlled at 145-150℃. The mixture is stirred for 3-4 hours at a speed of 400-500 rpm. Finally, composite modified aggregates are added, and the temperature is controlled at 140-145℃, and the mixture is stirred for 40-50 minutes at a speed of 350-400 rpm. The discharge temperature is then controlled at 135-140℃, and after cooling, the asphalt mixture is obtained.

[0025] The beneficial effects of this invention are as follows: (1) In this application, the aggregate is modified by tannic acid-sodium carbonate buffer solution and 3-aminopropyltriethoxysilane. Tannic acid molecules contain multiple phenolic hydroxyl groups and carboxyl groups. In a buffer system with pH=8.8-9.0, the phenolic hydroxyl groups ionize to form phenolic oxygen anions, which chelate with the metal cations on the surface of the aggregate to form a stable chelate film covering the surface of the aggregate. The ethoxy group of 3-aminopropyltriethoxysilane undergoes a dehydration condensation reaction with the hydroxyl groups on the surface of the aggregate to form a Si-O-aggregate chemical bond; the amino group at the other end undergoes hydrogen bonding with the carboxyl and hydroxyl groups of asphalt and resin in the asphalt, and at the same time forms an amide bond with the carboxyl group of tannic acid, thereby realizing the interfacial connection between aggregate-tannic acid-silane-asphalt, improving the interfacial bonding force, and ultimately improving the anti-scattering performance of the asphalt mixture.

[0026] (2) In this application, the ethoxy group of perfluorooctyltriethoxysilane in the composite additive is hydrolyzed and bonded to the hydroxyl groups on the surface of asphalt and aggregates, branching the perfluoro long chains at the interface to form a hydrophobic film, inhibiting the adsorption and penetration of water, and reducing interfacial peeling caused by water damage. Nano-silica is uniformly dispersed in the gaps between the asphalt matrix and aggregates, filling the micro-voids in the asphalt, improving the density of the asphalt matrix, and forming a nano-reinforcing network in synergy with graphene oxide, significantly improving the skeleton rigidity and deformation resistance of the mixture. Polyamide wax forms a three-dimensional network structure during the cooling process after melting, which can adsorb the lightweight components and nanoparticles in the asphalt, inhibiting their sedimentation or agglomeration; at the same time, it improves the viscosity and thixotropy of the asphalt mixture, avoids component separation during construction, ensures that the action mechanism of each modifier is fully utilized, and guarantees performance stability.

[0027] (3) In this application, nitrile rubber microspheres are embedded in the gap nodes of the styrene-butadiene-styrene block copolymer elastic network in a uniformly dispersed phase to form a composite structure. This structure does not disrupt the continuity of the elastic network, but also fills the network gaps with the micron-sized microspheres, avoiding stress concentration in weak links of the network and enhancing the density of the structure. The physical cross-linking of the hard segments of the styrene-butadiene-styrene block copolymer improves the high-temperature viscosity and anti-flow ability of asphalt. The nitrile rubber microspheres hinder the flow of asphalt molecules and the relative slippage of aggregates, forming a synergistic anti-deformation mechanism with the styrene-butadiene-styrene block copolymer network. The two work together to improve dynamic stability. The butadiene segments in the styrene-butadiene-styrene block copolymer molecular chain have good compatibility with the butadiene structure of the nitrile rubber microspheres, and can form molecular chain entanglement. The cyanide polar groups on the surface of the nitrile rubber microspheres form hydrogen bonds with the residual polar functional groups in the styrene-butadiene-styrene block copolymer molecular chain. At the same time, the styrene-butadiene-styrene block copolymer network provides a stable dispersion environment for the microspheres, avoiding microsphere aggregation.

[0028] (4) The high anti-scattering drainage asphalt mixture of the present invention has excellent anti-scattering performance, as well as excellent drainage performance and anti-rutting performance. The asphalt mixture prepared has a scattering loss of 4.6-5.1%, a permeability coefficient of 7795-7851 mL / min, and a dynamic stability of 7175-7342 times / mm. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention. Example 1

[0030] A highly resistant, non-scattering drainage asphalt mixture, by weight, comprises the following raw materials: The composition includes 90 parts of base asphalt, 6 parts of styrene-butadiene-styrene block copolymer, 2 parts of nitrile rubber microspheres, 10 parts of carboxylated silicone oil, 450 parts of composite modified aggregate, 3 parts of composite additive, 56 parts of graphene oxide mixed solution, and 9 parts of calcium lactate.

[0031] The base asphalt is selected from 70# or 90# Grade A road petroleum asphalt.

[0032] The particle size of the nitrile rubber microspheres is 20-60 μm.

[0033] The viscosity (25℃) of the carboxylated silicone oil is 1000-3500 mPa·s, and the content of active ingredients is ≥98%.

[0034] The styrene-butadiene-styrene block copolymer is selected from Baling YH-791.

[0035] A method for preparing a highly resistant, scattering-resistant drainage asphalt mixture includes the following steps: Step 1: Preparation of Composite Modified Aggregates Tannic acid and sodium carbonate were added to deionized water and stirred until completely dissolved. Sodium bicarbonate was added to adjust the pH of the solution to 8.8 to obtain a tannic acid-sodium carbonate buffer solution.

[0036] The mass ratio of tannic acid, sodium carbonate, and deionized water is 3:2:500.

[0037] Basalt, manufactured sand, and limestone powder were mixed evenly and dried. Then, the mixture was immersed in a tannic acid-sodium carbonate buffer solution at 60°C for 3 hours and stirred at 300 rpm. After filtration and drying, 3-aminopropyltriethoxysilane was added, and the mixture was stirred at 55°C for 1.5 hours and stirred at 250 rpm. After cooling, the composite modified aggregate was obtained.

[0038] The drying process involves a temperature of 105°C and a time of 5 hours.

[0039] The mass ratio of basalt, manufactured sand, and limestone powder is 88:3:3. The particle size of the basalt is 5-15 mm, the particle size of the manufactured sand is 0.15-5 mm, and the particle size of the limestone powder is ≤0.075 mm.

[0040] The amount of 3-aminopropyltriethoxysilane used is 0.2% of the total mass of basalt, manufactured sand, and limestone mineral powder.

[0041] Step 2: Preparation of graphene oxide mixed solution Potassium carbonate was added to deionized water and stirred until dissolved. Then graphene oxide was added and the mixture was sonicated to obtain a graphene oxide mixed solution.

[0042] The mass ratio of potassium carbonate, graphene oxide, and deionized water is 5:0.8:50.

[0043] The ultrasonic treatment involved an ultrasonic power of 300W and an ultrasonic time of 40 minutes.

[0044] Step 3: Preparation of composite additives Nano-silica, perfluorooctyltriethoxysilane, and polyamide wax were mixed, heated to 120°C, and stirred for 40 minutes at a speed of 400 rpm. After cooling, the mixture was pulverized to obtain a composite additive.

[0045] The pulverization process involves pulverizing the material to a particle size ≤ 5 μm using a pulverizer.

[0046] The mass ratio of the nano-silica, perfluorooctyltriethoxysilane, and polyamide wax is 10:2:5.

[0047] Step 4: Obtaining asphalt mixture The base asphalt was placed in a mixing tank, heated to 160℃, and stirred for 40 minutes at 200 rpm. Then, styrene-butadiene-styrene block copolymer and nitrile rubber microspheres were added, and stirred for 60 minutes at 500 rpm. Next, carboxylated silicone oil and composite additives were added, and the temperature was controlled at 155℃, while stirring for 40 minutes at 450 rpm. While stirring, a graphene oxide mixture was added, followed by calcium lactate, and the temperature was controlled at 145℃, while stirring for 4 hours at 400 rpm. Finally, composite modified aggregates were added, and the temperature was controlled at 140℃, while stirring for 50 minutes at 350 rpm. The discharge temperature was then controlled at 135℃, and after cooling, the asphalt mixture was obtained. Example 2

[0048] A highly resistant, non-scattering drainage asphalt mixture, by weight, comprises the following raw materials: The composition includes 95 parts of base asphalt, 5 parts of styrene-butadiene-styrene block copolymer, 3 parts of nitrile rubber microspheres, 9 parts of carboxylated silicone oil, 475 parts of composite modified aggregate, 2.8 parts of composite additives, 58 parts of graphene oxide mixed solution, and 8 parts of calcium lactate.

[0049] The base asphalt is selected from 70# or 90# Grade A road petroleum asphalt.

[0050] The particle size of the nitrile rubber microspheres is 20-60 μm.

[0051] The viscosity (25℃) of the carboxylated silicone oil is 1000-3500 mPa·s, and the content of active ingredients is ≥98%.

[0052] The styrene-butadiene-styrene block copolymer is selected from Baling YH-791.

[0053] A method for preparing a highly resistant, scattering-resistant drainage asphalt mixture includes the following steps: Step 1: Preparation of Composite Modified Aggregates Tannic acid and sodium carbonate were added to deionized water and stirred until completely dissolved. Sodium bicarbonate was added to adjust the pH of the solution to 8.9 to obtain a tannic acid-sodium carbonate buffer solution.

[0054] The mass ratio of tannic acid, sodium carbonate, and deionized water is 3.5:2.5:500.

[0055] Basalt, manufactured sand, and limestone powder were mixed evenly and dried. Then, the mixture was immersed in a tannic acid-sodium carbonate buffer solution at 65°C for 3 hours and stirred at 300 rpm. After filtration and drying, 3-aminopropyltriethoxysilane was added, and the mixture was stirred at 60°C for 1.5 hours and 300 rpm. After cooling, the composite modified aggregate was obtained.

[0056] The drying process involves a temperature of 110℃ and a time of 4.5 hours.

[0057] The mass ratio of basalt, manufactured sand, and limestone powder is 90:4:4. The particle size of the basalt is 5-15 mm, the particle size of the manufactured sand is 0.15-5 mm, and the particle size of the limestone powder is ≤0.075 mm.

[0058] The amount of 3-aminopropyltriethoxysilane used is 0.3% of the total mass of basalt, manufactured sand, and limestone mineral powder.

[0059] Step 2: Preparation of graphene oxide mixed solution Potassium carbonate was added to deionized water and stirred until dissolved. Then graphene oxide was added and the mixture was sonicated to obtain a graphene oxide mixed solution.

[0060] The mass ratio of potassium carbonate, graphene oxide, and deionized water is 6:1:50.

[0061] The ultrasonic treatment involved an ultrasonic power of 400W and an ultrasonic time of 40 minutes.

[0062] Step 3: Preparation of composite additives Nano-silica, perfluorooctyltriethoxysilane, and polyamide wax were mixed, heated to 125°C, and stirred for 35 minutes at a speed of 500 rpm. After cooling, the mixture was pulverized to obtain a composite additive.

[0063] The pulverization process involves pulverizing the material to a particle size ≤ 5 μm using a pulverizer.

[0064] The mass ratio of the nano-silica, perfluorooctyltriethoxysilane, and polyamide wax is 11:2.5:5.5.

[0065] Step 4: Obtaining asphalt mixture The base asphalt was placed in a mixing tank and heated to 165℃. The mixture was stirred for 35 minutes at 300 rpm. Then, styrene-butadiene-styrene block copolymer and nitrile rubber microspheres were added, and the mixture was stirred for 55 minutes at 600 rpm. Next, carboxylated silicone oil and composite additives were added, and the temperature was controlled at 160℃. The mixture was stirred for 40 minutes at 500 rpm. While stirring, a graphene oxide mixture was added, followed by calcium lactate. The temperature was controlled at 150℃, and the mixture was stirred for 3.5 hours at 500 rpm. Finally, composite modified aggregates were added, and the temperature was controlled at 145℃. The mixture was stirred for 50 minutes at 400 rpm. The discharge temperature was then controlled at 140℃, and after cooling, the asphalt mixture was obtained. Example 3

[0066] A highly resistant, anti-scattering, drainage asphalt mixture, by weight, comprises the following raw materials: 100 parts of base asphalt, 4 parts of styrene-butadiene-styrene block copolymer, 4 parts of nitrile rubber microspheres, 8 parts of carboxylated silicone oil, 500 parts of composite modified aggregate, 2.5 parts of composite additive, 59 parts of graphene oxide mixed solution, and 7 parts of calcium lactate.

[0067] The base asphalt is selected from 70# or 90# Grade A road petroleum asphalt.

[0068] The particle size of the nitrile rubber microspheres is 20-60 μm.

[0069] The viscosity (25℃) of the carboxylated silicone oil is 1000-3500 mPa·s, and the content of active ingredients is ≥98%.

[0070] The styrene-butadiene-styrene block copolymer is selected from Baling YH-791.

[0071] A method for preparing a highly resistant, non-scattering drainage asphalt mixture includes the following steps: Step 1: Preparation of Composite Modified Aggregates Tannic acid and sodium carbonate were added to deionized water and stirred until completely dissolved. Sodium bicarbonate was added to adjust the pH of the solution to 9.0 to obtain a tannic acid-sodium carbonate buffer solution.

[0072] The mass ratio of tannic acid, sodium carbonate, and deionized water is 4:3:500.

[0073] Basalt, manufactured sand, and limestone powder were mixed evenly and dried. Then, the mixture was immersed in a tannic acid-sodium carbonate buffer solution at 65°C for 2.5 hours and 400 rpm. After filtration and drying, 3-aminopropyltriethoxysilane was added, and the mixture was stirred at 60°C for 1 hour at 300 rpm. After cooling, the composite modified aggregate was obtained.

[0074] The drying process involves a temperature of 110℃ and a time of 4 hours.

[0075] The mass ratio of basalt, manufactured sand, and limestone powder is 92:5:5. The particle size of the basalt is 5-15 mm, the particle size of the manufactured sand is 0.15-5 mm, and the particle size of the limestone powder is ≤0.075 mm.

[0076] The amount of 3-aminopropyltriethoxysilane used is 0.3% of the total mass of basalt, manufactured sand, and limestone mineral powder.

[0077] Step 2: Preparation of graphene oxide mixed solution Potassium carbonate was added to deionized water and stirred until dissolved. Then graphene oxide was added and the mixture was sonicated to obtain a graphene oxide mixed solution.

[0078] The mass ratio of potassium carbonate, graphene oxide, and deionized water is 7:1.2:50.

[0079] The ultrasonic treatment involved an ultrasonic power of 400W and an ultrasonic time of 30 minutes.

[0080] Step 3: Preparation of composite additives Nano-silica, perfluorooctyltriethoxysilane, and polyamide wax were mixed, heated to 125°C, and stirred for 30 minutes at a speed of 500 rpm. After cooling, the mixture was pulverized to obtain a composite additive.

[0081] The pulverization process involves pulverizing the material to a particle size ≤ 5 μm using a pulverizer.

[0082] The mass ratio of the nano-silica, perfluorooctyltriethoxysilane, and polyamide wax is 12:3:6.

[0083] Step 4: Obtaining asphalt mixture The base asphalt was placed in a mixing tank, heated to 170℃, and stirred for 30 minutes at 300 rpm. Then, styrene-butadiene-styrene block copolymer and nitrile rubber microspheres were added, and stirred for 50 minutes at 600 rpm. Next, carboxylated silicone oil and composite additives were added, and the temperature was controlled at 160℃, while stirring for 30 minutes at 500 rpm. While stirring, a graphene oxide mixture was added, followed by calcium lactate, and the temperature was controlled at 150℃, while stirring for 3 hours at 500 rpm. Finally, composite modified aggregates were added, and the temperature was controlled at 145℃, while stirring for 40 minutes at 400 rpm. The discharge temperature was then controlled at 140℃, and after cooling, the asphalt mixture was obtained. Comparative Example 1

[0084] A highly resistant, anti-scattering, drainage asphalt mixture, by weight, comprises the following raw materials: The composition includes 95 parts of base asphalt, 5 parts of styrene-butadiene-styrene block copolymer, 3 parts of nitrile rubber microspheres, 9 parts of carboxylated silicone oil, 475 parts of aggregate, 2.8 parts of composite additives, 58 parts of graphene oxide mixed solution, and 8 parts of calcium lactate.

[0085] The base asphalt is selected from 70# or 90# Grade A road petroleum asphalt.

[0086] The particle size of the nitrile rubber microspheres is 20-60 μm.

[0087] The viscosity (25℃) of the carboxylated silicone oil is 1000-3500 mPa·s, and the content of active ingredients is ≥98%.

[0088] The styrene-butadiene-styrene block copolymer is selected from Baling YH-791.

[0089] A method for preparing a highly resistant, non-scattering drainage asphalt mixture includes the following steps: Step 1: Aggregate Preparation Basalt, manufactured sand, and limestone powder are mixed evenly and dried to obtain aggregate.

[0090] The drying process involves a temperature of 110°C and a time of 4.5 hours.

[0091] The mass ratio of basalt, manufactured sand, and limestone powder is 90:4:4. The particle size of the basalt is 5-15 mm, the particle size of the manufactured sand is 0.15-5 mm, and the particle size of the limestone powder is ≤0.075 mm.

[0092] Step 2: Preparation of graphene oxide mixed solution This step is the same as the "Preparation of graphene oxide mixed solution" step in Example 2.

[0093] Step 3: Preparation of composite additives This step is the same as the "Preparation of Composite Additive" step in Example 2.

[0094] Step 4: Obtaining asphalt mixture The base asphalt was placed in a mixing tank and heated to 165℃. The mixture was stirred for 35 minutes at 300 rpm. Then, styrene-butadiene-styrene block copolymer and nitrile rubber microspheres were added, and the mixture was stirred for 55 minutes at 600 rpm. Next, carboxylated silicone oil and composite additives were added, and the temperature was controlled at 160℃. The mixture was stirred for 40 minutes at 500 rpm. While stirring, a graphene oxide mixture was added, followed by calcium lactate. The temperature was controlled at 150℃, and the mixture was stirred for 3.5 hours at 500 rpm. Finally, aggregates were added, and the temperature was controlled at 145℃. The mixture was stirred for 50 minutes at 400 rpm. The discharge temperature was then controlled at 140℃, and after cooling, the asphalt mixture was obtained. Comparative Example 2

[0095] A highly resistant, anti-scattering, drainage asphalt mixture, by weight, comprises the following raw materials: The composition includes 95 parts of base asphalt, 5 parts of styrene-butadiene-styrene block copolymer, 3 parts of nitrile rubber microspheres, 9 parts of carboxylated silicone oil, 475 parts of composite modified aggregate, 58 parts of graphene oxide mixed solution, and 8 parts of calcium lactate.

[0096] The base asphalt is selected from 70# or 90# Grade A road petroleum asphalt.

[0097] The particle size of the nitrile rubber microspheres is 20-60 μm.

[0098] The viscosity (25℃) of the carboxylated silicone oil is 1000-3500 mPa·s, and the content of active ingredients is ≥98%.

[0099] The styrene-butadiene-styrene block copolymer is selected from Baling YH-791.

[0100] A method for preparing a highly resistant, non-scattering drainage asphalt mixture includes the following steps: Step 1: Preparation of Composite Modified Aggregates This step is the same as the "composite modified aggregate preparation" step in Example 2.

[0101] Step 2: Preparation of graphene oxide mixed solution This step is the same as the "Preparation of graphene oxide mixed solution" step in Example 2.

[0102] Step 3: Obtaining asphalt mixture The base asphalt was placed in a mixing tank, heated to 165℃, and stirred for 35 minutes at 300 rpm. Then, styrene-butadiene-styrene block copolymer and nitrile rubber microspheres were added, and stirred for 55 minutes at 600 rpm. Next, carboxylated silicone oil was added, and the temperature was controlled at 160℃, while stirring for 40 minutes at 500 rpm. While stirring, a mixed solution of graphene oxide was added, followed by calcium lactate, and the temperature was controlled at 150℃, while stirring for 3.5 hours at 500 rpm. Finally, composite modified aggregate was added, and the temperature was controlled at 145℃, while stirring for 50 minutes at 400 rpm. The discharge temperature was then controlled at 140℃, and after cooling, the asphalt mixture was obtained.

[0103] Example 4 Performance Test

[0104] (a) The asphalt mixtures prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to anti-scattering performance tests according to the test methods specified in T0733 of JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", and the scattering loss of the asphalt mixtures was calculated. The specific test results are shown in Table 1.

[0105] Table 1 Scattering loss (%) 5.1 4.6 4.9 13.5 9.3 As shown in Table 1, the asphalt mixtures prepared in Examples 1-3 have a dispersion loss of 4.6-5.1%, which proves that the asphalt mixtures prepared in this invention have excellent anti-dispersion performance.

[0106] (ii) The drainage performance of the asphalt mixtures prepared in Examples 1-3 and Comparative Examples 1-2 was tested according to the test method specified in T0730 of JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", and the permeability coefficient of the asphalt mixture was calculated. The specific test results are shown in Table 2.

[0107] Table 2 Permeability coefficient (mL / min) 7795 7851 7823 6780 6325 As shown in Table 2, the permeability coefficient of the asphalt mixtures prepared in Examples 1-3 is 7795-7851 mL / min, which proves that the asphalt mixtures prepared in this invention have excellent drainage performance.

[0108] (III) The asphalt mixtures prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to rutting resistance tests according to the test methods specified in T0719 of JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The dynamic stability of the asphalt mixtures was calculated. The specific test results are shown in Table 3.

[0109] Table 3 Dynamic stability (cycles / mm) 7240 7342 7175 5638 6352 As shown in Table 3, the dynamic stability of the asphalt mixtures prepared in Examples 1-3 is 7175-7342 cycles / mm, which proves that the prepared asphalt mixtures have excellent rutting resistance.

[0110] Obviously, there are many other possible implementation methods under the concept of this invention. It should be stated here that any changes made under the inventive concept of this invention will fall within the protection scope of this invention.

Claims

1. A method for preparing a high-resistance, high-drift-resistant asphalt mixture, characterized in that: The process includes the steps of preparing composite modified aggregates, preparing graphene oxide mixed solution, preparing composite additives, and obtaining asphalt mixture. The composite modified aggregate is prepared as follows: Tannic acid and sodium carbonate are added to deionized water and stirred until completely dissolved. The pH value of the solution is adjusted to obtain a tannic acid-sodium carbonate buffer solution. Basalt coarse aggregate, manufactured sand, and limestone ore powder are mixed evenly and dried. Then, the mixture is immersed in the tannic acid-sodium carbonate buffer solution and stirred. After filtration and drying, 3-aminopropyltriethoxysilane is added, stirred, and cooled to obtain the composite modified aggregate. The preparation of the graphene oxide mixed solution involves adding potassium carbonate to deionized water, stirring until dissolved, then adding graphene oxide, and ultrasonically treating the solution to obtain the graphene oxide mixed solution. The preparation of the composite additive involves mixing nano-silica, perfluorooctyltriethoxysilane, and polyamide wax, heating, melting and stirring, cooling, and then pulverizing to obtain the composite additive. The asphalt mixture is prepared by: placing base asphalt in a mixing tank, heating and stirring; then adding styrene-butadiene-styrene block copolymer and nitrile rubber microspheres, and stirring; then adding carboxylated silicone oil and composite additives, and stirring; while stirring, adding graphene oxide mixed solution, then adding calcium lactate, and stirring; finally adding composite modified aggregate, and stirring; controlling the discharge temperature, and cooling to obtain the asphalt mixture; the weight ratio of the raw materials used is: base asphalt 90-100 parts, styrene-butadiene-styrene block copolymer 4-6 parts, nitrile rubber microspheres 2-4 parts, carboxylated silicone oil 8-10 parts, composite modified aggregate 450-500 parts, composite additives 2.5-3 parts, graphene oxide mixed solution 56-59 parts, and calcium lactate 7-9 parts.

2. The method for preparing a high-resistance, anti-scattering drainage asphalt mixture according to claim 1, characterized in that: In the preparation step of the composite modified aggregate, the mass ratio of tannic acid, sodium carbonate and deionized water is (3-4):(2-3):

500.

3. The method for preparing a high-diffuse-resistant asphalt mixture according to claim 1, characterized in that: The mass ratio of the basalt coarse aggregate, manufactured sand, and limestone ore powder is (88-92):(3-5):(3-5).

4. The method for preparing a high-resistance, anti-scattering drainage asphalt mixture according to claim 1, characterized in that: The amount of 3-aminopropyltriethoxysilane used is 0.2-0.3% of the total mass of basalt coarse aggregate, manufactured sand, and limestone mineral powder.

5. The method for preparing a high-resistance, anti-scattering drainage asphalt mixture according to claim 1, characterized in that: The basalt coarse aggregate has a particle size of 5-15mm, the manufactured sand has a particle size of 0.15-5mm, and the limestone mineral powder has a particle size of ≤0.075mm.

6. The method for preparing a high-diffuse-resistant asphalt mixture according to claim 1, characterized in that: In the step of preparing the graphene oxide mixed solution, the mass ratio of potassium carbonate, graphene oxide, and deionized water is (5-7):(0.8-1.2):

50.

7. The method for preparing a high-resistance, anti-scattering drainage asphalt mixture according to claim 1, characterized in that: The ultrasonic treatment involves an ultrasonic power of 300-400W and an ultrasonic time of 30-40 minutes.

8. The method for preparing a high-resistance, anti-scattering drainage asphalt mixture according to claim 1, characterized in that: The pulverization process involves pulverizing the material to a particle size ≤ 5 μm using a pulverizer.

9. The method for preparing a high-resistance, anti-scattering drainage asphalt mixture according to claim 1, characterized in that: The mass ratio of the nano-silica, perfluorooctyltriethoxysilane, and polyamide wax is (10-12):(2-3):(5-6).