Composite bamboo residue fiber particle for asphalt pavement and preparation method and application thereof

Abstract

The application discloses a kind of composite bamboo residue fiber particles for asphalt pavement, the composite bamboo residue fiber particles are made of bamboo residue fiber 37%~60%, plastic base material 34%~60% and auxiliary agent 3%~6%, and it is proposed that bamboo residue fiber is sheared and screened, and plastic base material and auxiliary agent are mixed and heated, then extruded and cut into particles, to obtain composite bamboo residue fiber particles, the composite bamboo residue fiber particles are mixed with coarse aggregate, fine aggregate, asphalt and mineral powder, to obtain composite bamboo residue fiber reinforced asphalt mixture.The application obtains granular bamboo residue fiber composite material by processing and treating bamboo residue fiber, the preparation process is simple, the production cost is lower, the obtained composite bamboo residue fiber particles are convenient to transport, dry and moisture-proof, do not form group in asphalt mixture, have good dispersion effect, can effectively improve the high-temperature performance and crack resistance of asphalt pavement, have important significance for providing new road plant fiber, reducing asphalt pavement crack damage and developing durable asphalt pavement.

Description

Technical Field

[0001] This invention belongs to the field of general molding of road engineering materials in plastic state, specifically relating to a composite bamboo residue fiber particle for asphalt pavement, its preparation method and application. Background Technology

[0002] Asphalt pavement, as a type of plastic and flexible pavement, possesses excellent road performance and is widely used in the construction of high-grade roads worldwide. However, with the increasing traffic load and the impact of harsh weather, asphalt pavements often crack and deteriorate, leading to water damage, reducing road performance and service life, and posing safety hazards. Fiber-reinforced asphalt mixtures are currently one of the most widely used asphalt mixtures both domestically and internationally. The fibers form a three-dimensional network structure within the asphalt mixture. When the asphalt mixture is under stress, the fibers act as reinforcement and bridging, preventing crack propagation and extending the service life of the asphalt pavement. Polyester fibers, lignin fibers, and mineral fibers are the most widely used in road engineering. However, with increasing environmental requirements in road construction and maintenance, the concept of green building has been widely accepted. While considering driving comfort and safety, the economy, environmental friendliness, and sustainability of materials must also be taken into account. However, lignin fibers are made from wood, and the slow growth cycle of wood leads to a shortage of lignin fiber raw materials, which to some extent limits the widespread application of green and environmentally friendly plant-based fiber materials in road engineering. Therefore, it is urgent to find a green, environmentally friendly road fiber that meets the requirements of sustainable development.

[0003] my country is rich in bamboo resources, which are a renewable resource. Regular bamboo harvesting promotes rapid bamboo growth, and bamboo exhibits significant carbon sequestration and absorption during production. With the advancement of the "bamboo-for-plastic" concept and practice, a large amount of waste is generated after the initial processing of bamboo. This waste is the source of bamboo residue fiber. Bamboo residue fiber not only has high tensile strength but also excellent elongation at break. When incorporated into asphalt mixtures, it can effectively prevent brittle fracture of pavements and improve the low-temperature performance of the pavement. Simultaneously, the rough, porous, and hollow structure of bamboo residue fiber gives it strong oil absorption, providing good adsorption and stabilization for asphalt. Incorporating bamboo residue fiber, obtained from bamboo waste, into asphalt mixtures not only improves the road performance of asphalt pavements but also realizes the reuse of bamboo waste, significantly increasing the comprehensive utilization rate of bamboo resources. However, although bamboo residue fiber possesses good properties and has the potential for application in road asphalt mixtures, it is prone to clumping during production and transportation. Furthermore, it tends to clump unevenly during mixture mixing, ultimately affecting the road performance of the asphalt mixture and preventing the full utilization of its superior properties. Therefore, solving the clumping problem of bamboo residue fiber, ensuring its uniform dispersion during asphalt mixture mixing to fully utilize its inherent properties, and thereby improving the performance of the asphalt mixture and extending the service life of asphalt pavements, is an urgent problem to be solved at present.

[0004] Therefore, there is a need to provide composite bamboo residue fiber particles for asphalt pavement, their preparation method, and their applications. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a composite bamboo residue fiber granule for asphalt pavement. This composite bamboo residue fiber granule, using bamboo residue fiber and with controlled dosage, can play a good role in reinforcement, dispersion, adsorption, adhesion, and stabilization when used as a fiber additive in asphalt mixtures. The network structure of the bamboo residue fiber in the mixture can effectively improve the flexibility and crack resistance of asphalt pavement, slow down the propagation rate of pavement cracks, thereby improving the pavement's resistance to rutting, cracking, aging, and water damage, as well as its durability, and extending the service life of the road.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a composite bamboo residue fiber granule for asphalt pavement, characterized in that the composite bamboo residue fiber granule is composed of the following components in terms of mass fraction: 37%~60% bamboo residue fiber, 34%~60% plastic base material and 3%~6% additives.

[0007] This invention utilizes bamboo residue fiber, and by controlling its dosage, as a fiber additive in asphalt mixtures. This fiber provides excellent reinforcement, dispersion, adsorption, adhesion, and stabilization. The network structure of the bamboo residue fiber in the mixture effectively enhances the flexibility and crack resistance of asphalt pavements, slows the propagation rate of pavement cracks, and thus improves the pavement's resistance to rutting, cracking, aging, and water damage, as well as its durability, extending the road's service life. The use of a plastic base material, with controlled dosage, acts to adhere the bamboo residue fiber, improving the performance of the composite bamboo residue fiber particles. Additives can be added as needed to enhance the antioxidant, anti-stripping, and anti-aging properties of the composite bamboo residue fiber particles.

[0008] The above-mentioned composite bamboo residue fiber particles for asphalt pavement are characterized in that the composite bamboo residue fiber particles are composed of the following components by mass fraction: 45%~55% bamboo residue fiber, 40%~51% plastic matrix and 4%~5% additives.

[0009] The above-mentioned composite bamboo fiber granules for asphalt pavement are characterized in that the composite bamboo fiber granules are composed of the following components by mass fraction: 50% bamboo fiber, 45% plastic matrix and 5% additives.

[0010] The aforementioned composite bamboo residue fiber granules for asphalt pavement are characterized in that the plastic base material is polyolefin, and the additives are silane coupling agents, antioxidants, and anti-stripping agents. In this invention, polyolefin is used as the plastic base material, which has stable structure, excellent chemical properties, extremely low water absorption, and excellent electrical insulation. During the preparation of the composite bamboo residue fiber granules, a greater amount of bamboo residue fiber can adhere to it. After being added to the asphalt mixture, it integrates into the asphalt and can also improve the high-temperature performance and rutting resistance of the mixture.

[0011] It should be noted that the polyolefin is polyethylene or polypropylene, the antioxidant is an aromatic amine antioxidant, and the anti-stripping agent is an amine anti-stripping agent; the silane coupling agent and the anti-stripping agent will enhance the adhesion between asphalt and aggregate during the mixing process, and the antioxidant will improve the anti-aging properties of the asphalt mixture and extend the service life of the asphalt pavement.

[0012] In addition, the present invention also provides a method for preparing composite bamboo residue fiber particles for asphalt pavement, characterized in that the method includes the following steps:

[0013] Step 1, Vacuum Drying: The bamboo residue fiber is mechanically sheared and sieved, then washed with clean water, and finally evenly spread in a shallow tray and placed in a vacuum drying oven to dry, thus obtaining dried bamboo residue fiber.

[0014] Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the granulator, then heated and mixed evenly, and then extruded into the filament-shaped mold to form a filament-shaped bamboo residue fiber composite material.

[0015] Step 3, Cooling and Dehydration: The bamboo fiber bundles obtained in Step 2 are placed in a water tank for cooling and then dried;

[0016] Step 4, pelletizing: The dried bamboo residue fiber composite material from step 3 is fed into a pelletizer and uniformly cut into pellets to obtain composite bamboo residue fiber pellets.

[0017] This invention mechanically shears and sieves bamboo residue fibers, classifying them according to length range for easy granulation and ensuring uniform dispersion in the mixture, preventing clumping. Washing with water removes dust and impurities from the bamboo residue fibers, preventing carbonization during granulation and its adverse effects on the performance of the asphalt mixture. Drying removes moisture from the bamboo residue fibers, facilitating subsequent bonding and filament formation. Heating and mixing ensures complete melting of other additives while maintaining the stability of the bamboo residue fibers, allowing for filament formation while preserving their properties. Extruding these filaments into a mold yields a composite material of bamboo residue fibers. Cooling in a water bath sets the composite material, and drying with a fan removes moisture. Finally, a pelletizer uniformly cuts the composite into granules, yielding composite bamboo residue fiber particles.

[0018] The above method is characterized in that the length of the bamboo residue fibers after mechanical shearing and sieving in step one is 3mm~5mm, the drying temperature is 115℃~125℃, and the drying time is 1.5h~3h. This invention facilitates granulation by controlling the sieving length, ensuring uniform dispersion in the mixture and preventing clumping, thus giving the composite bamboo residue fiber granules optimal performance. By controlling the drying parameters, the moisture is quickly and thoroughly dried without affecting the properties of the bamboo residue fibers.

[0019] The method described above is characterized in that the heating temperature in step two is 200℃~250℃, and the length of the bundled bamboo residue fiber composite material is 600mm~800mm. Controlling the heating temperature facilitates the drying of bamboo residue fibers, plastic matrix, and additives, which are then mixed and molded.

[0020] The method described above is characterized in that the cooling time in step three is 1 to 3 hours. This cooling time ensures that the dried bamboo fiber bundles are fully solidified and formed.

[0021] The method described above is characterized in that the length of the composite bamboo residue fiber particles in step four is 6mm to 10mm. This facilitates the modification of asphalt mixtures by the bamboo residue fiber composite material, showcasing the advantages of bamboo residue fiber.

[0022] In addition, the present invention also provides an application of composite bamboo residue fiber particles for asphalt pavement, characterized in that the application includes the following steps:

[0023] Step 101: Preheat the coarse aggregate and fine aggregate in an oven at 180℃~200℃ for 0.5h~1h, and preheat the composite bamboo residue fiber particles in an oven at 180℃~200℃ for 90s~120s. Then, pour the preheated coarse aggregate, fine aggregate and composite bamboo residue fiber particles into a mixing pot and premix at 180℃~200℃ for 90s~120s to obtain the precursor mixture.

[0024] Step 102: Pour the precursor mixture obtained in step 101 into a mixing pot and maintain the temperature at 180℃~200℃. Then add asphalt and mix for 90s~120s. Next, add mineral powder that has been preheated at 180℃~200℃ for 0.5h~1h and mix for 90s~120s to obtain composite bamboo residue fiber reinforced asphalt mixture.

[0025] This invention facilitates subsequent mixing by preheating the raw materials and improves the mixing effect by controlling the preheating temperature, without affecting the material properties. Coarse and fine aggregates are added to act as a skeleton and filler, respectively. Asphalt is added to form an asphalt mixture, and mineral powder is added to fill the voids in the asphalt mixture, improving its integrity, strength, and stability. The addition of composite bamboo fiber particles not only improves the asphalt mixture's rutting and crack resistance but also enhances its anti-aging and interfacial adhesion properties. This composite bamboo fiber-reinforced asphalt mixture, when used in asphalt pavements, further extends the service life of the asphalt pavement.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This invention utilizes bamboo slag fiber and controls its dosage as a fiber additive in asphalt mixtures. This fiber can effectively reinforce, disperse, adsorb, adhere, and stabilize the asphalt pavement. The network structure of bamboo slag fiber in the mixture can effectively improve the flexibility and crack resistance of asphalt pavement, slow down the propagation rate of pavement cracks, thereby improving the pavement's resistance to rutting, cracking, aging, and water damage, as well as its durability, and extending the service life of the road. This invention is of great significance for providing new types of road plant fibers, reducing asphalt pavement crack damage, and developing durable asphalt pavements.

[0028] 2. This invention uses plastic base material and controls the amount to adhere bamboo residue fibers, thereby improving the performance of composite bamboo residue fiber particles. Additives can be added as needed to enhance the antioxidant, anti-peeling, and anti-aging properties of the composite bamboo residue fiber particles.

[0029] 3. This invention mechanically shears and sieves bamboo residue fibers to ensure they are evenly dispersed in the mixture and do not easily clump together. Heating and mixing allow the added materials to completely melt while maintaining the stability of the bamboo residue fibers. The mixture is then extruded into a filament-like mold and cooled in a water bath to solidify the filament-like bamboo residue fiber composite material. Finally, it is uniformly cut into granules using a pelletizer to obtain composite bamboo residue fiber granules. These granules are easy to store, have a long shelf life, are not easily affected by moisture, and do not clump during transportation, facilitating subsequent use.

[0030] 4. By controlling the preparation parameters, this invention enables the composite bamboo residue fiber particles to be significantly and evenly dispersed during the preparation of asphalt mixtures, avoiding the phenomenon of fiber aggregation and clumping. It can also improve the rutting resistance and crack resistance of asphalt mixtures, and further extend the service life of asphalt pavements.

[0031] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0032] Example 1

[0033] The composite bamboo residue fiber particles of this embodiment are composed of the following components by mass fraction: 50% bamboo residue fiber, 45% plastic base material and 5% additives; the plastic base material is polyethylene, and the additives are silane coupling agent, antioxidant 1010 and PA-1 type asphalt anti-stripping agent.

[0034] This embodiment includes the following steps:

[0035] Step 1, Vacuum drying: The bamboo residue fiber is mechanically sheared and sieved. The length of the sieved bamboo residue fiber is 3mm~5mm. Then it is washed with clean water, and finally spread evenly in a shallow tray and placed in a vacuum drying oven at 120℃ for 2 hours to obtain dried bamboo residue fiber.

[0036] Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the twin-screw extruder granulator, then heated to 200℃ and mixed evenly, and then extruded into the filament bundle mold to form a filament bundle bamboo residue fiber composite material with a length of 600mm~800mm.

[0037] Step 3, Cooling and Dehydration: The bamboo fiber composite material in bundles obtained in Step 2 is placed in a water tank and cooled for 2 hours, and then dried by blowing air.

[0038] Step 4: Pelletizing: The towed bamboo residue fiber composite material dried in Step 3 is fed into a pelletizer and uniformly cut into pellets, yielding composite bamboo residue fiber pellets with a length of 6mm~10mm.

[0039] Step 5: Preheat the coarse aggregate and fine aggregate in an oven at 200℃ for 0.5h, preheat the composite bamboo residue fiber particles in an oven at 200℃ for 90s, and then pour the preheated coarse aggregate, fine aggregate and composite bamboo residue fiber particles into a mixing pot and premix at 200℃ for 90s to obtain the precursor mixture.

[0040] Step 6: Pour the precursor mixture obtained in Step 5 into the mixing pot and keep the temperature at 200℃. Then add asphalt and mix for 90 seconds. Next, add mineral powder that has been preheated at 200℃ for 0.5 hours and mix for 90 seconds to obtain composite bamboo residue fiber reinforced asphalt mixture.

[0041] Example 2

[0042] The composite bamboo residue fiber particles of this embodiment are composed of the following components by mass fraction: 55% bamboo residue fiber, 40% plastic base material and 5% additives; the plastic base material is polyethylene, and the additives are silane coupling agent, antioxidant 1010 and PA-1 type asphalt anti-stripping agent.

[0043] This embodiment includes the following steps:

[0044] Step 1, Vacuum drying: The bamboo residue fiber is mechanically sheared and sieved. The length of the sieved bamboo residue fiber is 3mm~5mm. Then it is washed with clean water, and finally spread evenly in a shallow tray and placed in a vacuum drying oven at 120℃ for 2 hours to obtain dried bamboo residue fiber.

[0045] Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the twin-screw granulator, then heated to 210℃ and mixed evenly, and then extruded into the filament bundle mold to form a filament bundle bamboo residue fiber composite material with a length of 600mm~800mm.

[0046] Step 3, Cooling and Dehydration: The bamboo fiber composite material in bundles obtained in Step 2 is placed in a water tank and cooled for 2 hours, and then dried by blowing air.

[0047] Step 4: Pelletizing: The towed bamboo residue fiber composite material dried in Step 3 is fed into a pelletizer and uniformly cut into pellets, yielding composite bamboo residue fiber pellets with a length of 6mm~10mm.

[0048] Step 5: Preheat the coarse and fine aggregates in an oven at 180℃ for 1 hour, and preheat the composite bamboo residue fiber particles in an oven at 180℃ for 120 seconds. Then, pour the preheated coarse and fine aggregates and composite bamboo residue fiber particles into a mixing pot and premix at 180℃ for 120 seconds to obtain the precursor mixture.

[0049] Step 6: Pour the precursor mixture obtained in Step 5 into the mixing pot and keep the temperature at 180℃. Then add asphalt and mix for 120 seconds. Next, add mineral powder that has been preheated at 180℃ for 1 hour and mix for 120 seconds to obtain composite bamboo residue fiber reinforced asphalt mixture.

[0050] Example 3

[0051] The composite bamboo residue fiber particles of this embodiment are composed of the following components by mass fraction: 45% bamboo residue fiber, 51% plastic base material and 4% additives; the plastic base material is polypropylene, and the additives are silane coupling agent, antioxidant 1010 and PA-1 type asphalt anti-stripping agent.

[0052] This embodiment includes the following steps:

[0053] Step 1, Vacuum drying: The bamboo residue fiber is mechanically sheared and sieved. The length of the sieved bamboo residue fiber is 3mm~5mm. Then it is washed with clean water, and finally spread evenly in a shallow tray and placed in a vacuum drying oven at 120℃ for 2 hours to obtain dried bamboo residue fiber.

[0054] Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the twin-screw granulator, then heated to 220℃ and mixed evenly, and then extruded into the filament bundle mold to form a filament bundle bamboo residue fiber composite material with a length of 600mm~800mm.

[0055] Step 3, Cooling and Dehydration: The bamboo fiber composite material obtained in Step 2 is placed in a water tank and cooled for 2 hours, and then dried by blowing air.

[0056] Step 4: Pelletizing: The towed bamboo residue fiber composite material dried in Step 3 is fed into a pelletizer and uniformly cut into pellets, yielding composite bamboo residue fiber pellets with a length of 6mm~10mm.

[0057] Step 5: Preheat the coarse and fine aggregates in an oven at 190℃ for 0.8 hours, and preheat the composite bamboo residue fiber particles in an oven at 190℃ for 100 seconds. Then, pour the preheated coarse and fine aggregates and composite bamboo residue fiber particles into a mixing pot and premix at 190℃ for 100 seconds to obtain the precursor mixture.

[0058] Step 6: Pour the precursor mixture obtained in Step 5 into the mixing pot and keep the temperature at 190℃. Then add asphalt and mix for 100 seconds. Next, add mineral powder that has been preheated at 190℃ for 0.8 hours and mix for 100 seconds to obtain composite bamboo residue fiber reinforced asphalt mixture.

[0059] Example 4

[0060] The composite bamboo residue fiber particles of this embodiment are composed of the following components by mass fraction: 37% bamboo residue fiber, 60% plastic base material and 3% additives; the plastic base material is polypropylene, and the additives are silane coupling agent, antioxidant 1010 and PA-1 type asphalt anti-stripping agent.

[0061] This embodiment includes the following steps:

[0062] Step 1, Vacuum Drying: The bamboo residue fiber is mechanically sheared and sieved. The length of the sieved bamboo residue fiber is 3mm~5mm. Then it is washed with clean water, and finally spread evenly in a shallow tray and placed in a vacuum drying oven at 115℃ for 3 hours to obtain dried bamboo residue fiber.

[0063] Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the twin-screw granulator, then heated to 230℃ and mixed evenly, and then extruded into the filament bundle mold to form a filament bundle bamboo residue fiber composite material with a length of 600mm~800mm.

[0064] Step 3, Cooling and Dehydration: The bamboo fiber composite material obtained in Step 2 is placed in a water tank and cooled for 3 hours, and then dried by blowing air.

[0065] Step 4: Pelletizing: The towed bamboo residue fiber composite material dried in Step 3 is fed into a pelletizer and uniformly cut into pellets, yielding composite bamboo residue fiber pellets with a length of 6mm~10mm.

[0066] Step 5: Preheat the coarse and fine aggregates in an oven at 180℃ for 1 hour, and preheat the composite bamboo residue fiber particles in an oven at 180℃ for 100 seconds. Then, pour the preheated coarse and fine aggregates and composite bamboo residue fiber particles into a mixing pot and premix at 180℃ for 100 seconds to obtain the precursor mixture.

[0067] Step 6: Pour the precursor mixture obtained in Step 5 into the mixing pot and keep the temperature at 180℃. Then add asphalt and mix for 100 seconds. Next, add mineral powder that has been preheated at 180℃ for 1 hour and mix for 100 seconds to obtain composite bamboo residue fiber reinforced asphalt mixture.

[0068] Example 5

[0069] The composite bamboo residue fiber particles of this embodiment are composed of the following components by mass fraction: 60% bamboo residue fiber, 34% plastic base material and 6% additives; the plastic base material is polypropylene, and the additives are silane coupling agent, antioxidant 1010 and PA-1 type asphalt anti-stripping agent.

[0070] This embodiment includes the following steps:

[0071] Step 1, Vacuum Drying: The bamboo residue fiber is mechanically sheared and sieved. The length of the sieved bamboo residue fiber is 3mm~5mm. Then it is washed with clean water, and finally spread evenly in a shallow tray and placed in a vacuum drying oven at 125℃ for 1.5h to obtain dried bamboo residue fiber.

[0072] Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the twin-screw granulator, then heated to 250℃ and mixed evenly, and then extruded into the filament bundle mold to form a filament bundle bamboo residue fiber composite material with a length of 600mm~800mm.

[0073] Step 3, Cooling and Dehydration: Place the bundled bamboo residue fiber composite material obtained in Step 2 into a water tank and cool for 1 hour, then dry it with air.

[0074] Step 4: Pelletizing: The towed bamboo residue fiber composite material dried in Step 3 is fed into a pelletizer and uniformly cut into pellets, yielding composite bamboo residue fiber pellets with a length of 6mm~10mm.

[0075] Step 5: Preheat the coarse and fine aggregates in an oven at 180℃ for 1 hour, and preheat the composite bamboo residue fiber particles in an oven at 180℃ for 100 seconds. Then, pour the preheated coarse and fine aggregates and composite bamboo residue fiber particles into a mixing pot and premix at 180℃ for 100 seconds to obtain the precursor mixture.

[0076] Step 6: Pour the precursor mixture obtained in Step 5 into the mixing pot and keep the temperature at 180℃. Then add asphalt and mix for 100 seconds. Next, add mineral powder that has been preheated at 180℃ for 1 hour and mix for 100 seconds to obtain composite bamboo residue fiber reinforced asphalt mixture.

[0077] The composite bamboo residue fiber-reinforced asphalt mixtures prepared in Examples 1-5 of this invention were tested for road performance according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The test results are shown in Table 1.

[0078] Table 1

[0079]

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An application of composite bamboo fiber particles for asphalt pavement, characterized in that, The application includes the following steps: Step 101: Preheat the coarse aggregate and fine aggregate in an oven at 180℃~200℃ for 0.5h~1h, and preheat the composite bamboo residue fiber particles in an oven at 180℃~200℃ for 90s~120s. Then, pour the preheated coarse aggregate, fine aggregate and composite bamboo residue fiber particles into a mixing pot and premix at 180℃~200℃ for 90s~120s to obtain the precursor mixture. Step 102: Pour the precursor mixture obtained in step 101 into a mixing pot and keep the temperature at 180℃~200℃. Then add asphalt and mix for 90s~120s. Then add mineral powder that has been preheated at 180℃~200℃ for 0.5h~1h and mix for 90s~120s to obtain composite bamboo residue fiber reinforced asphalt mixture. The composite bamboo residue fiber granules are composed of the following components by mass fraction: 37%~60% bamboo residue fiber, 34%~60% plastic base material, and 3%~6% additives; the plastic base material is polyolefin, and the additives are silane coupling agents, antioxidants, and anti-stripping agents; The method for preparing the composite bamboo residue fiber particles for asphalt pavement includes the following steps: Step 1, Vacuum Drying: The bamboo residue fiber is mechanically sheared and sieved, then washed with clean water, and finally evenly spread in a shallow tray and placed in a vacuum drying oven to dry, thus obtaining dried bamboo residue fiber. Step 2, Heating and Molding: The dried bamboo residue fiber, plastic base material and additives obtained in Step 1 are added to the feeding port of the granulator, then heated and mixed evenly, and then extruded into the filament-shaped mold to form a filament-shaped bamboo residue fiber composite material. Step 3, Cooling and Dehydration: The bamboo fiber bundles obtained in Step 2 are placed in a water tank for cooling and then dried; Step 4, pelletizing: The dried bamboo residue fiber composite material from step 3 is fed into a pelletizer and uniformly cut into pellets to obtain composite bamboo residue fiber pellets.

2. The application of composite bamboo fiber particles for asphalt pavement according to claim 1, characterized in that, The composite bamboo residue fiber particles are composed of the following components by mass fraction: 45%~55% bamboo residue fiber, 40%~51% plastic base material and 4%~5% additives.

3. The application of composite bamboo fiber particles for asphalt pavement according to claim 1, characterized in that, The composite bamboo residue fiber particles are composed of the following components by mass fraction: 50% bamboo residue fiber, 45% plastic base material and 5% additives.

4. The application of composite bamboo fiber particles for asphalt pavement according to claim 1, characterized in that, The length of the bamboo residue fibers after mechanical shearing and sieving in step one is 3mm~5mm, and the drying temperature is 115℃~125℃, and the time is 1.5h~3h.

5. In the application of composite bamboo fiber particles for asphalt pavement according to claim 1, the heating temperature in step two is 200℃~250℃, and the length of the bundled bamboo fiber composite material is 600mm~800mm.

6. The application of composite bamboo fiber particles for asphalt pavement according to claim 1, characterized in that, The cooling time mentioned in step three is 1 to 3 hours.

7. The application of composite bamboo fiber particles for asphalt pavement according to claim 1, characterized in that, The length of the composite bamboo residue fiber particles mentioned in step four is 6mm~10mm.

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