CN118085415A - Asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking and application thereof - Google Patents
Asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking and application thereof Download PDFInfo
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- CN118085415A CN118085415A CN202410509739.9A CN202410509739A CN118085415A CN 118085415 A CN118085415 A CN 118085415A CN 202410509739 A CN202410509739 A CN 202410509739A CN 118085415 A CN118085415 A CN 118085415A
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- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
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- WFLYOQCSIHENTM-UHFFFAOYSA-N molybdenum(4+) tetranitrate Chemical compound [N+](=O)([O-])[O-].[Mo+4].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-] WFLYOQCSIHENTM-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking and application thereof. The MXene in the asphalt pavement rut-resistant modifier provided by the invention has high specific surface area, has tackifying effect on asphalt, and the interconnection between carbon nanotubes can construct a three-dimensional network in asphalt, so that the interfacial compatibility between MXene and an asphalt matrix is improved, the high-temperature rut resistance and permanent deformation resistance of asphalt are improved, the stability and durability of asphalt are improved, and the defects of poor low-temperature performance and the like of a modified asphalt composite material are overcome; meanwhile, the anti-rutting modifier for the asphalt pavement is derived from waste plastics, so that white pollution and resource waste are reduced.
Description
Technical Field
The invention relates to the technical field of polymer composite materials, in particular to an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, and a preparation method and application thereof.
Background
Asphalt pavement refers to pavement structures in which a surface layer is paved by asphalt mixtures on a flexible or semi-rigid substrate. The asphalt pavement has the characteristics of low driving noise, easy maintenance, easy recovery of service performance, strong adaptability to road base deformation and the like, and is widely applied to road traffic construction. However, asphalt pavement is also insufficient, such as rutting is easy to generate, particularly under the condition of more weather in extreme environments such as high temperature and raininess, the high temperature rutting and water damage of the asphalt pavement are serious, the rutting problem not only seriously affects the service life and the driving quality of the pavement, but also easily causes driving safety accidents, so that how to solve the rutting problem of the asphalt pavement becomes the focus of attention of highway design, construction, maintenance and research institutions.
Ruts are a main form of road surface damage, are difficult to fundamentally avoid and completely solve by means of traditional road materials and structures, and urgent need for new materials to replace to realize sustainable development of traffic, and at present, rut resistance agents are usually added to solve the rut problem of the road surface. The nano material can improve the road performance and mechanical property of the asphalt mixture due to the special properties such as nano effect and surface effect, but the single nano material has certain limitation in improving the asphalt performance. Chinese patent CN110499036a discloses a nano modified asphalt and its preparation method, the component contains nano material (including one or several of nano TiO 2, nano CaCO 3 and/or nano ZnO mixture), but the nano material is simply blended with matrix asphalt. Chinese patent CN1537894a discloses a method for preparing polymer modified asphalt material for road paving with high-temperature storage stability, which comprises pre-mixing thermoplastic elastomer polystyrene-polybutadiene-polystyrene triblock copolymer (SBS) with stabilizer silicate inorganic filler by high molecular processing equipment to obtain master batch for modified asphalt, and then dispersing the modified master batch into matrix asphalt by high shear mixer, wherein the asphalt material prepared by the method still has defects in performance.
The hot-mix asphalt mixture (HMA) is used in the traditional asphalt road construction, so that a road surface with stable performance can be constructed, but the construction is required under the high-temperature condition (about 180 ℃), toxic gas can be released to cause injury to constructors, and the asphalt road surface is oxidized and a large amount of energy consumption is caused. Therefore, a novel environment-friendly asphalt pavement rut-resistant modifier needs to be developed, the required mechanical property and pavement property of the modifier are met, and the modifier has important significance for popularization of modified asphalt technology and recycling of waste plastic.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, and a preparation method and application thereof, and aims to solve the problems of energy consumption and environmental pollution caused by the traditional asphalt mixture in the construction process and improve the pavement performance of a modified asphalt composite material.
The invention adopts the following technical scheme for realizing the purpose:
The invention provides an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, which is characterized in that: the asphalt pavement rut-resistant modifier is formed by compounding MXene and a carbon nano tube; the MXene is obtained by etching titanium aluminum carbide through hydrogen fluoride; the carbon nano tube is obtained by taking waste plastic as a carbon source and growing on the surface of the MXene in situ through catalytic pyrolysis of a catalyst, namely the MXene loaded carbon nano tube.
Further, the catalyst is derived from salts of one or more metals of nickel, cobalt, molybdenum, iron.
Further, the waste plastic is derived from one or any combination of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polystyrene, polyethylene terephthalate and polyvinyl chloride.
Further, the preparation method of the MXene comprises the following steps: mixing lithium fluoride and hydrochloric acid to etch titanium aluminum carbide, centrifuging, ultrasonic treating and freeze drying to obtain the MXene tablet.
Further, the preparation method of the asphalt pavement rut resistant modifier comprises the following steps:
(1) Waste plastics are crushed by using a crusher and a pulverizer to form a granular material.
(2) Dispersing MXene in deionized water, and performing ultrasonic dispersion under the protection of inert gas; then adding a nitrate solution of catalyst metal, uniformly dispersing again by ultrasonic, and drying to obtain a solid compound of MXene and the catalyst; and grinding the solid compound into powder, putting the powder into a tube furnace, and calcining the powder in an inert gas atmosphere to obtain the MXene supported catalyst powder.
(3) And (3) carrying out melt blending and extrusion molding on the prepared MXene supported catalyst powder and the waste plastic particles in an extruder, and crushing the product by a crusher to obtain the composite particles of the waste plastic and the MXene supported catalyst.
(4) And (3) placing the composite particles of the waste plastics and the MXene supported catalyst into a tubular furnace, and heating the composite particles in an inert gas atmosphere to obtain the asphalt pavement rut-resistant modifier.
Preferably, in step (2): the mass ratio of the MXene to the deionized water is 1:150-250, and the time of the first ultrasonic dispersion is 3-5 hours; the concentration of the salt solution of the catalyst metal is 1-5 mol/L, and the time of ultrasonic dispersion is 0.5-2 h again; the salt of the catalyst metal is preferably a nitrate of the catalyst metal, such as one or any combination of nickel nitrate, cobalt nitrate, molybdenum nitrate and ferric nitrate; the calcining temperature is 400-600 ℃, the heat preservation time is 2-4 hours, and the heating rate is 5-15 ℃/min; the loading of the catalyst on the surface of the MXene is 1-10% (calculated by the mass ratio of metal in the salt of the catalyst metal to the MXene).
Preferably, in step (3): the temperature of the extruder is 150-220 ℃ and the rotating speed is 150-300 rpm; the particle size of the obtained composite particles is 0.01-1.5 mm.
Preferably, in step (3): the mass ratio of the MXene supported catalyst powder to the waste plastic particles is 1:90-100.
Preferably, in step (4): the heating temperature is 700-900 ℃, the heat preservation time is 1-3 h, and the heating rate is 5-15 ℃/min.
The asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, which is prepared by the method, can be directly used in asphalt pavement construction for enhancing the pavement performance of modified asphalt and increasing the range of the road construction of the modified asphalt pavement. The specific method comprises the following steps: adding the asphalt pavement anti-rutting modifier into matrix asphalt through melt blending and high-speed shearing to obtain a modified asphalt composite material, wherein the mass ratio of the asphalt pavement anti-rutting modifier to the matrix asphalt is 0.01-0.05: 1.
Further, the matrix asphalt is one or any combination of No. 70, no. 90, SBS modified asphalt and high-viscosity asphalt.
Compared with the prior art, the invention has the beneficial effects that:
1. The anti-rutting modifier for the asphalt pavement provided by the invention is prepared by the following steps: firstly, etching titanium aluminum carbide by hydrogen fluoride to obtain an MXene sheet; then preparing the low-cost carbon nano tube from the high-molecular-weight waste plastics through catalytic pyrolysis, wherein the carbon nano tube is obtained by taking the waste plastics as a carbon source and growing on the surface of MXene in situ through catalytic pyrolysis of a catalyst; finally, the MXene loaded carbon nano tube and asphalt are blended to obtain the modified asphalt composite material. The MXene in the asphalt pavement rut-resistant modifier provided by the invention has high specific surface area and tackifying effect on asphalt, and the interconnection between the carbon nanotubes can construct a three-dimensional network in the asphalt, so that the interfacial compatibility between the MXene and an asphalt matrix is improved, and the high-temperature rut resistance and permanent deformation resistance of the modified asphalt composite material are improved; meanwhile, the asphalt pavement rut-resistant modifier can improve the stability and durability of asphalt, and overcomes the defects of poor low-temperature performance and the like of a modified asphalt composite material, and the addition of the asphalt pavement rut-resistant modifier enables the matrix asphalt to have good mechanical performance and pavement performance.
2. The rut-resistant modifier for the asphalt pavement is derived from waste plastics, realizes high added value transformation of the waste plastics, is beneficial to reducing white pollution, realizes the concept of energy conservation and environmental protection, and greatly reduces the production cost.
3. The carbon nano tube grows in situ in MXene, and the uniform growth of the carbon nano tube is realized.
Drawings
FIG. 1 is a three-dimensional block diagram of an MXene-loaded carbon nanotube according to the present invention.
FIG. 2 is an SEM image at low magnification of an MXene-loaded carbon nanotube prepared in example 1 according to the invention.
FIG. 3 is an SEM image of an MXene-loaded carbon nanotube prepared in example 1 of the present invention at a high magnification.
FIG. 4 is a TEM image of an MXene-loaded carbon nanotube prepared in example 1 of the present invention at a low magnification.
FIG. 5 is a TEM image of an MXene-loaded carbon nanotube prepared in example 1 of the present invention at a high magnification.
FIG. 6 shows the phase angles of the asphalt composites obtained in examples 1 to 3 and comparative example 1 according to the present invention at high temperatures.
FIG. 7 shows the phase angles of the asphalt composites obtained in examples 1 to 3 and comparative example 1 according to the present invention at low temperatures.
FIG. 8 shows the complex shear modulus at high temperature of the asphalt composites obtained in examples 1-3 and comparative example 1 according to the present invention.
FIG. 9 shows rutting factors at high temperatures for the asphalt composites of examples 1-3 and comparative example 1 of the present invention.
FIG. 10 shows the complex shear modulus at low temperature of the asphalt composites obtained in examples 1 to 3 and comparative example 1 according to the present invention.
FIG. 11 shows rutting factors at low temperatures for the asphalt composites of examples 1-3 and comparative example 1 of the present invention.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
Example 1
The embodiment provides an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, and a preparation method and application thereof, and the asphalt pavement rut-resistant modifier comprises the following steps:
Step 1, 30mL (with the concentration of 12 mol/L) of hydrochloric acid and 10mL of deionized water are taken and put into a plastic bottle with the capacity of 60mL, and 3.2g of lithium fluoride is added. The plastic container was placed in a 40 ℃ oil bath and the magnetic stirrer was turned on. When the temperature was raised to 40 ℃, 2g of titanium aluminum carbide was weighed, all of which was placed in a plastic bottle over a period of five minutes, and covered with a plastic cap for reaction for 24 hours. The solution was poured into two centrifuge tubes of equal mass, water was added to the tubes to 50g and centrifuged at 5000rpm for 1 minute. And repeating centrifugation for multiple times until the color of the supernatant becomes black, indicating that a single layer of MXene appears, continuing centrifugation for 1-2 times, and when the bottom is completely sticky and the sediment cannot be shaken down from the pipe wall at the moment, pouring the supernatants of the two pipes into two new centrifuge pipes respectively, adding water to 50g, and naming the two pipes as a pipe 1 and a pipe 2. To the two centrifuge tubes containing the remaining solids was added water to 50g and designated tube 3 and tube 4. Four centrifuge tubes were placed in an ultrasonic cleaner, sonicated for 20 minutes, and after all completed, placed in a centrifuge, and centrifuged at 3500rpm for 20 minutes to obtain a four-tube etch layered MXene solution. The solution in the four tubes was poured into another bottle and nitrogen filled for 10 minutes, and the collected dark green supernatant was pre-frozen (-30 ℃) in a refrigerator and then placed in a freeze-drying apparatus (-47 ℃) and the system was continuously evacuated for 48 hours to sublimate the frozen solvent, thereby collecting the fluffy MXene nanoplatelets.
And 2, crushing the waste high-density polyethylene (HDPE) by using a crusher and a crusher to form granular materials.
And step 3, weighing 1g of MXene, dissolving in 200mL of deionized water, protecting by Ar gas, and performing ultrasonic dispersion for 4 hours. 1mol/L nickel nitrate solution is dripped on MXene, ultrasonic dispersion is carried out for 1h, and the nickel loading is controlled to be 10%. And then drying at 100 ℃ to obtain the solid composite of MXene and nickel. Grinding the obtained solid compound into powder, then placing the powder into a quartz boat, roasting in a tube furnace at a temperature rising rate of 5 ℃ per minute under argon atmosphere, keeping the roasting temperature at 500 ℃ for 3 hours, and taking out the powder after cooling to room temperature to obtain the prepared MXene loaded nickel powder.
And 4, weighing 0.1g of MXene-loaded nickel powder and 10g of waste high-density polyethylene (HDPE), carrying out melt blending and extrusion molding at 170 ℃ in an extruder, and crushing the product by a crusher to obtain composite particles of waste plastics with the particle size of 0.01-1.5 mm and MXene-loaded nickel.
And 5, placing the composite particles of the waste plastics and the MXene loaded nickel into a quartz boat, and heating the composite particles to 800 ℃ from room temperature in an argon atmosphere in a tube furnace at a heating speed of 5 ℃/min. And (3) preserving heat for 2 hours after the temperature reaches 800 ℃, cooling to room temperature, and taking out to obtain the MXene-loaded carbon nano tube, namely the anti-rutting modifier for the asphalt pavement.
And 6, weighing 1 part of MXene-loaded carbon nano tube and 100 parts of No. 70 asphalt, heating to 160 ℃, waiting for complete melting of the asphalt, shearing by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 3000rpm, the shearing time is 30min, and pouring the mixture into a silica gel mold while the mixture is hot after shearing is completed, thus obtaining the MXene-loaded carbon nano tube modified asphalt composite material.
Example 2
The embodiment provides an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, and a preparation method and application thereof, and the asphalt pavement rut-resistant modifier comprises the following steps:
step 1 to step 5: the same as in example 1.
And 6, weighing 2 parts of MXene-loaded carbon nano tube and 100 parts of No. 70 asphalt, heating to 160 ℃, waiting for complete melting of the asphalt, shearing by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 3000 rpm, the shearing time is 30min, and pouring the mixture into a silica gel mold while the mixture is hot after shearing is completed, thus obtaining the MXene-loaded carbon nano tube modified asphalt composite material.
Example 3
The embodiment provides an asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking, a preparation method and application thereof, and the asphalt pavement rut-resistant modifier comprises the following steps:
step 1 to step 5: the same as in example 1.
And 6, weighing 3 parts of MXene-loaded carbon nano tube and 100 parts of No. 70 asphalt, heating to 160 ℃ until the asphalt is completely melted, shearing by using a high-speed shearing machine, wherein the rotating speed of the shearing machine is 3000 rpm, the shearing time is 30 min, and pouring the mixture into a silica gel mold while the mixture is hot after shearing is completed, thus obtaining the MXene-loaded carbon nano tube modified asphalt composite material.
Comparative example 1
100 Parts of No. 70 asphalt is weighed, the temperature is increased to 180 ℃ until the asphalt is completely melted, a high-speed shearing machine is used for shearing, the shearing rate is 3000 rpm, the shearing time is 30min, and after the shearing is completed, the asphalt composite material is obtained by pouring the asphalt into a silica gel mold while the asphalt is hot.
Morphology characterization: fig. 2 and 3 are SEM images of the MXene-loaded carbon nanotubes prepared in example 1, and it can be seen that the carbon nanotubes and MXene sheets, through which the carbon nanotubes were grown, are very apparent.
Fig. 4 and 5 are TEM images of the MXene-loaded carbon nanotubes prepared in example 1, and the carbon nanotubes on MXene can be clearly seen.
Performance test: the asphalt composites of examples 1-3 and comparative example 1 were tested for high temperature and low temperature performance using an MCR 702 type advanced rheometer from austria An Dongpa, inc. According to AASHTO T315-02 standard, and the results are shown in fig. 6-11.
The phase angle may reflect the viscoelastic properties of the asphalt composite, with the phase angle of the ideal elastic material being 0 and the phase angle of the ideal viscous material being 90. As can be seen from fig. 6 and 7, MXene-loaded carbon nanotubes with different addition ratios can significantly affect the phase angle of the asphalt composite. The phase angle of the asphalt composite material can be increased at high temperature, which means that the application of the anti-rutting modifier in asphalt can lead the asphalt to show the characteristic closer to an ideal viscous material, and the characteristic of the ideal viscous material shows that the anti-rutting modifier has good tackifying effect at high temperature. At low temperatures, except for example 2, the phase angle of the asphalt composite can be reduced, which means that the application of the anti-rutting modifier in asphalt can make the asphalt show characteristics closer to those of a rational elastic material, and the characteristics of an ideal elastic material show that the anti-rutting modifier has good viscosity reduction effect at low temperatures.
The complex shear modulus can reflect the deformation resistance of the asphalt composite material at high temperature, and the larger the complex shear modulus is, the better the deformation resistance at high temperature is. As can be seen from fig. 8, in a certain addition ratio range, the MXene-loaded carbon nanotube can significantly improve the deformation resistance of the asphalt composite material under the high temperature condition. As shown, the G values for all samples tended to decrease with increasing temperature (from 46 ℃ to 82 ℃) and then remained balanced between 72 ℃ and 82 ℃ revealing poor resistance to deformation of the asphalt at high temperatures. In the low temperature range (46-70 ℃), MXene loaded carbon nano tubes with different proportions are added to obtain modified asphalt containing the anti-rutting modifier, wherein the G values of the modified asphalt are higher than those of matrix asphalt, which indicates that the anti-rutting modifier of the asphalt pavement can be added to improve the anti-deformation performance of asphalt.
The rutting factor (G/Sin delta) means the resistance of asphalt to permanent deformation at high temperature, and can reflect the resistance of asphalt composite materials to rutting damage in the actual use process, and the larger the rutting factor is, the stronger the resistance of asphalt composite materials to rutting damage is. As can be seen from fig. 9, the asphalt pavement rut resistance modifier can significantly improve the rut damage resistance of the asphalt composite material under the high-temperature condition within a certain addition proportion range. As shown in the figure, the G/Sin delta values of the asphalt composite material containing the rutting resistant modifier are all larger than those of the matrix asphalt, so that the rutting resistant modifier of the asphalt pavement has positive strengthening effect on the permanent deformation resistance of asphalt.
As can be seen from fig. 10 and 11, the low Wen Fujian shear modulus and the low temperature rutting factor of the modified asphalt composite using the MXene-loaded carbon nanotube were substantially lower than those of comparative example 1, indicating that the low temperature performance was weaker than that of comparative example 1, but still satisfied the use requirements.
Through the performance test, key performance indexes such as tackifying effect, rheological property, permanent deformation resistance, high-temperature stability and the like of the MXene loaded carbon nano tube on the asphalt composite material can be comprehensively evaluated. These test results can verify whether the performance of the asphalt pavement anti-rut modifier meets the expectations and provide references for further optimization and improvement. The analysis shows that when the dosage ratio of the MXene loaded carbon nano tube to the asphalt composite material is 2:100 (example 2), the modified asphalt composite of the invention has the most excellent high temperature rutting resistance.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention and not intended to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiment, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. Asphalt pavement rut-resistant modifier based on waste plastic catalytic cracking is characterized in that: the asphalt pavement rut-resistant modifier is formed by compounding MXene and a carbon nano tube;
the MXene is obtained by etching titanium aluminum carbide through hydrogen fluoride; the carbon nano tube is obtained by taking waste plastic as a carbon source and growing on the surface of MXene in situ through catalytic pyrolysis of a catalyst.
2. The asphalt pavement rut-resistant modifier based on catalytic cracking of waste plastics according to claim 1, wherein: the catalyst is derived from salts of one or more metals of nickel, cobalt, molybdenum, iron.
3. The asphalt pavement rut-resistant modifier based on catalytic cracking of waste plastics according to claim 1, wherein: the waste plastic is derived from one or any combination of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polystyrene, polyethylene terephthalate and polyvinyl chloride.
4. A method for preparing the asphalt pavement rut resistant modifier based on catalytic cracking of waste plastics according to any one of claims 1-3, which is characterized by comprising the following steps:
(1) Crushing the waste plastics by using a crusher and a pulverizer to form granular materials;
(2) Dispersing MXene in deionized water, and performing ultrasonic dispersion under the protection of inert gas; then adding a salt solution of catalyst metal, uniformly dispersing again by ultrasonic, and drying to obtain a solid compound of MXene and the catalyst; grinding the solid compound into powder, putting the powder into a tubular furnace, and calcining the powder in an inert gas atmosphere to obtain MXene supported catalyst powder;
(3) Carrying out melt blending and extrusion molding on the MXene supported catalyst powder and the waste plastic particles in an extruder, and crushing the product by a crusher to obtain composite particles of the waste plastic and the MXene supported catalyst;
(4) And (3) placing the composite particles of the waste plastics and the MXene supported catalyst into a tubular furnace, and heating the composite particles in an inert gas atmosphere to obtain the asphalt pavement rut-resistant modifier.
5. The method according to claim 4, wherein in the step (2): the mass ratio of the MXene to the deionized water is 1:150-250, and the time of the first ultrasonic dispersion is 3-5 hours; the concentration of the salt solution of the catalyst metal is 1-5 mol/L, and the time of ultrasonic dispersion is 0.5-2 h.
6. The method of manufacturing according to claim 4, wherein: in the step (2), the calcining temperature is 400-600 ℃, the heat preservation time is 2-4 h, and the heating rate is 5-15 ℃/min; the loading of the catalyst on the surface of the MXene is 1-10%.
7. The method of manufacturing according to claim 4, wherein: in the step (3), the temperature of the extruder is 150-220 ℃, the rotating speed is 150-300 rpm, and the particle size of the obtained composite particles is 0.01-1.5 mm.
8. The method of manufacturing according to claim 4, wherein: in the step (3), the mass ratio of the MXene supported catalyst powder to the waste plastic particles is 1:90-100.
9. The method of manufacturing according to claim 4, wherein: in the step (4), the heating temperature is 700-900 ℃, the heat preservation time is 1-3 h, and the heating rate is 5-15 ℃/min.
10. Use of an anti-rutting modifier according to any one of claims 1 to 3 in asphalt, characterized in that: and adding the rut resistant modifier into asphalt according to the mass percentage of 1-5%.
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