Production process of asphalt mastic macadam mixture

Abstract

The invention provides a production process of an asphalt mastic macadam mixture, which comprises the following steps: S1, respectively putting asphalt and lignin fibers into a stirrer, and uniformly stirring to obtain asphalt slurry; s2, stone composed of coarse aggregate, fine aggregate and mineral powder is put into a mixing and stirring cylinder; s3, putting the asphalt slurry into the mixing and stirring cylinder, and mixing and stirring the asphalt slurry with the stone in the mixing and stirring cylinder to obtain an asphalt mastic macadam mixture; according to the production process of the asphalt mastic macadam mixture, traditional dry mixing is replaced by premixing of the asphalt and the lignin fibers, synchronous and continuous production can be achieved, the production period is shortened, energy consumption and equipment loss are reduced, meanwhile, the lignin fibers can be evenly dispersed in the asphalt to form high-quality asphalt slurry, and the quality of the asphalt mastic macadam mixture is improved. The mastic macadam mixture formed by mixing and stirring the asphalt slurry with the graded coarse aggregate, fine aggregate and mineral powder has stable performance, and can effectively avoid the problems of loose pavement, flooding and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of road asphalt, and in particular relates to a production process for asphalt mastic aggregate mixture. Background Technology

[0002] SMA (Stone Mastic Asphalt) is an asphalt mixture composed of asphalt, lignin fiber, mineral powder, coarse aggregate, and fine aggregate. It has good high-temperature stability, low-temperature crack resistance, and durability, and is widely used in high-grade highway pavement engineering.

[0003] The traditional production process of asphalt mastic aggregate mixture is as follows: first, add the aggregate to the mixing pot, then add lignin fiber particles and dry mix with the aggregate for 15 seconds, and finally add asphalt and wet mix for 60 seconds. This process has the following drawbacks: ① Long mixing time: Each batch of asphalt mixture produced by the mixing pot takes 15 seconds longer than that of AC type mixtures, which adds up to 15 minutes per hour. This can easily damage the mixing pot, as the sharp edges of the previously added aggregates wear down the inner wall of the pot during the dry mixing process with the lignin fibers. Long-term wear will lead to a decrease in the performance of the mixing pot. ② High noise level: The aggregates rub and collide with the inner wall of the mixing pot during dry mixing, generating significant noise. ③ Increased energy consumption: As mentioned above regarding the longer mixing time, the extra 15 seconds of dry mixing results in higher energy consumption during production. ④ Insufficient dispersion of lignin fibers: The lignin fibers are only mixed with the aggregates through friction, making it difficult for the fiber particles to disperse. This leads to uneven dispersion of lignin fiber particles in the mixture, resulting in clumping, oil spots, and other phenomena. During subsequent road construction, the road surface is prone to looseness, potholes, and oil seepage.

[0004] Therefore, there is a need to provide a production process for asphalt mastic aggregate that differs from traditional processes. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention provides a production process for asphalt mastic aggregate mixture.

[0006] To achieve the objectives of this invention, the following technical solution is adopted: A production process for asphalt mastic aggregate includes the following steps: S1. Place the asphalt and lignin fiber into a mixer and mix them evenly to obtain asphalt slurry; S2. Place the stone material composed of coarse aggregate, fine aggregate and mineral powder into the mixing tank; S3. The asphalt slurry is placed into the mixing tank and mixed with the stone material in the mixing tank to obtain asphalt mastic crushed stone mixture; While step S3 is being performed, step S1 is repeated to prepare the next batch of asphalt slurry, so that steps S1, S2 and S3 form a continuous production process for asphalt mastic aggregate mixture.

[0007] In step S1, asphalt and lignin fibers are placed into a mixer to form a uniform asphalt slurry with well-dispersed fibers. In this step, asphalt is used as a carrier and pre-mixed with lignin fibers to avoid dispersion caused by insufficient friction when lignin fibers come into direct contact with the stone.

[0008] Preferably, in step S1, the content of lignin fiber is 5-10% of the total amount of asphalt slurry. By controlling the content of lignin fiber within this range, the reinforcing effect of lignin fiber on asphalt mixture can be guaranteed, and the lignin fiber and asphalt can be fully mixed, so that agglomeration and clumping will not occur due to excessive use of lignin fiber.

[0009] Preferably, in step S1, the asphalt is modified asphalt or 70... # Asphalt, modified asphalt and 70 # Asphalt meets the requirements for high-grade highways in both high and low temperature performance. Modified asphalt, in particular, is suitable for applications with high pavement performance requirements. # Asphalt has good versatility and economy. In this invention, if modified asphalt is used, SBS modified asphalt is preferred. This asphalt is an elastomer modified asphalt, which has good melt flow properties when mixed and paved at high temperature, making it easy to mix with lignin fibers.

[0010] Preferably, in step S1, the mixing speed of the mixer is 50-150 rpm, the temperature is 140-190℃, and the time is 15-30s. Through multiple tests, it has been verified that when the mixing process parameters of the mixer are within the above range, the mixing effect of asphalt and lignin fiber can be guaranteed, ensuring that the lignin fiber can be evenly dispersed in the asphalt. Furthermore, the above mixing process parameters of the mixer can prevent the asphalt from aging due to excessively high temperature or energy waste due to excessively long mixing time.

[0011] Asphalt mastic aggregate mixtures are based on a "skeleton-compact" structure. Coarse aggregates form a robust skeleton, while asphalt mastic, composed of asphalt, lignin fibers, and mineral powder, fills the gaps in the skeleton, providing bonding, lubrication, and stabilization. If the asphalt content is too low, the amount of asphalt mastic will not be sufficient to fully coat the surface of the coarse aggregates and fill the gaps in the skeleton, resulting in insufficient bonding strength of the mixture. This can easily lead to problems such as loose aggregates and insufficient pavement compaction, and in later use, loosening and potholes are likely to occur. If the asphalt content is too high, the excess asphalt will form a free state in the mixture. This not only increases production costs but also leads to excessively high viscosity of the mixture, affecting the uniformity of production mixing and the smoothness of construction and paving. It can also easily cause high-temperature stability defects such as oil bleeding and rutting on the pavement, reducing the service life of the pavement. Therefore, after multiple tests and demonstrations, the preferred asphalt content in this invention is 5-7% of the total amount of the asphalt mastic aggregate mixture.

[0012] In step S2, the pretreatment process of the aggregate is carried out, in which the aggregate composed of coarse aggregate, fine aggregate and mineral powder is put into a mixing tank. Preferably, the coarse aggregate includes first-stage coarse aggregate with a particle size of 11-16mm, second-stage coarse aggregate with a particle size of 6-11mm, and third-stage coarse aggregate with a particle size of 3-6mm. The fine aggregate has a particle size of 0-3mm. By combining aggregates of different particle sizes, a compact and strong skeleton structure is formed, which improves the strength and stability of the asphalt mastic aggregate mixture.

[0013] In this invention, one function of the first-stage coarse aggregate is to provide structural bearing capacity for the asphalt mastic macadam mixture and improve its rutting resistance. A second function is to maintain the skeleton stability of the asphalt mastic macadam mixture. Due to the larger particle size of the first-stage coarse aggregate, it is less prone to breakage during actual construction and compaction, maintaining a stable particle shape and ensuring the skeleton structure does not collapse. A third function is to control the void structure of the asphalt mastic macadam mixture. The distribution of the first-stage coarse aggregate determines the macroscopic void pattern within the skeleton, providing a spatial basis for the subsequent filling of the second and third-stage coarse aggregates. It also reserves suitable gaps for asphalt mastic filling, balancing the compactness and permeability of the mixture, and avoiding water damage due to excessively large voids or bleeding problems caused by excessively small voids.

[0014] In this invention, one function of the second-stage coarse aggregate is to fill the gaps between the first-stage coarse aggregate. Because the gaps in the skeleton formed by the first-stage coarse aggregate are relatively large, directly filling them with fine aggregate can easily lead to the skeleton becoming "suspended" and losing its interlocking effect. The second-stage coarse aggregate can precisely fill these gaps, forming a double-layer interlocking structure of "main skeleton - secondary skeleton" together with the first-stage coarse aggregate, further reducing the macroscopic voids inside the skeleton and improving the overall density and deformation resistance of the mixture. The second function is to enhance the shear resistance of the skeleton. The second-stage coarse aggregate has high strength and angularity. After filling the gaps, it can form multi-point contact with the first-stage coarse aggregate, increasing the friction and interlocking force between particles and effectively resisting the horizontal shear force generated by vehicle loads. The third function is to optimize the continuity of the mixture gradation. If only the first and third-stage coarse aggregates are used, gradation jumps are likely to occur, causing segregation of the mixture during mixing and paving. The second-stage coarse aggregate can make the gradation curve smoother, improve the uniformity of the mixture, and ensure stable construction quality.

[0015] In this invention, one function of the third-grade coarse aggregate is to fill the micro-gaps in the secondary skeleton. After the first and second-grade coarse aggregates have filled the skeleton, there are still small micro-gaps. The third-grade coarse aggregate can further fill these gaps, reducing the porosity of the coarse aggregate skeleton to a reasonable range. The second function is to balance the skeleton strength and workability. The third-grade coarse aggregate has a smaller particle size, combining the strength of coarse aggregate with the flowability of fine aggregate. The third function is to improve the coating efficiency of asphalt mastic. The specific surface area of ​​the third-grade coarse aggregate is larger than that of the first and second-grade coarse aggregates, resulting in a larger contact area with the asphalt mastic, which can enhance the bonding effect between the aggregate and the binder.

[0016] In this invention, one function of fine aggregate is to participate in the formation of asphalt mastic, where it, together with asphalt slurry and mineral powder, forms the asphalt mastic binder, filling the remaining voids in the coarse aggregate skeleton. A second function is to enhance the pavement's impermeability; the fine aggregate fills the tiny voids between the coarse aggregate skeleton and the asphalt mastic, forming a dense impermeable layer that prevents rainwater and snowmelt from seeping into the pavement. A third function is to improve workability; due to the small particle size of fine aggregate, it has good fluidity, filling the tiny voids in the mixture, making it easier to mix evenly during the mixing process and easier to compact during paving.

[0017] In this invention, one function of mineral powder is to enhance the bonding performance of asphalt. Since the specific surface area of ​​mineral powder exceeds that of the coarse and fine aggregates, it can adsorb a large number of asphalt molecules, forming a stable asphalt-mineral powder adsorption layer. This gives the asphalt mastic stronger bonding force and can also firmly bind the coarse and fine aggregates together, preventing aggregate detachment and reducing road surface scattering losses. A second function is to regulate the stability of the asphalt mastic. The alkaline components of mineral powder, such as CaO, can chemically react with the acidic components in the asphalt, forming a chemical bond and further enhancing the thermal stability and anti-aging properties of the asphalt mastic. A third function is to ensure the volume stability of the mixture. The mineral powder fills the tiny gaps between the fine aggregates and the asphalt slurry, further reducing the porosity of the mixture and increasing its density.

[0018] Specifically, the following two preferred schemes are adopted in the process of stone matching: ① The content of the first-grade coarse aggregate is 35% of the total stone, the content of the second-grade coarse aggregate is 35% of the total stone, the content of the third-grade coarse aggregate is 10% of the total stone, the content of the fine aggregate is 10% of the total stone, and the content of the mineral powder is 10% of the total stone.

[0019] ② The content of the first-grade coarse aggregate is 35% of the total stone, the content of the second-grade coarse aggregate is 35% of the total stone, the content of the third-grade coarse aggregate is 8% of the total stone, the content of the fine aggregate is 12% of the total stone, and the content of the mineral powder is 10% of the total stone.

[0020] The above two aggregate proportion schemes ① and ② can be selected according to the load-bearing requirements of the road surface, climate conditions and other factors in different construction scenarios, to ensure that the performance of the asphalt mastic aggregate mixture matches the usage requirements.

[0021] Preferably, in step S2, the temperature of the stone is 140-190℃, so that the temperature of the stone is consistent with the mixing temperature of the asphalt slurry, which can avoid a sudden drop in temperature when the asphalt slurry and stone are mixed due to excessive temperature difference, thus affecting the fluidity and coating effect of the asphalt.

[0022] Preferably, in step S3, the asphalt-aggregate ratio between the asphalt slurry and the aggregate is 6.0-7.0%. The asphalt-aggregate ratio is a key factor affecting the performance of asphalt mixtures. The above-mentioned asphalt-aggregate ratio can ensure that the asphalt slurry fully coats the aggregate particles and forms a stable asphalt mastic structure, which not only meets the bonding strength requirements of the mixture, but also avoids the road surface from bleeding due to too much asphalt or loosening due to too little asphalt.

[0023] While step S3 is being performed, step S1 is repeated to prepare the next batch of asphalt slurry, so that steps S1, S2 and S3 form a continuous production process for asphalt mastic aggregate mixture. This enables continuous production of asphalt mastic aggregate mixture, greatly improves production efficiency, and avoids the time wasted in traditional processes that require waiting for dry mixing to be completed before subsequent operations can be carried out.

[0024] The beneficial effects of this invention are: This invention addresses the problems of uneven fiber dispersion and low production efficiency in the traditional asphalt mastic aggregate production process by improving and optimizing the process. Specifically, it pre-mixes lignin fibers with asphalt to prepare asphalt slurry, replacing the original dry mixing step of fibers and aggregates. This optimization not only saves approximately 15 seconds of dry mixing time, significantly shortening the production cycle and reducing energy consumption and costs, but also effectively reduces wear and tear on the mixing equipment caused by aggregates, extending the equipment's service life.

[0025] In this invention, the premixing process allows lignin fibers to be evenly dispersed in asphalt, avoiding the formation of lumps and oil stains. The asphalt slurry formed by the two can better coat the aggregate, improve the overall stability of the mixture and the road surface durability, and reduce the possible loosening, bleeding and other defects after construction.

[0026] The production process of this invention also has the environmental benefits of reducing production noise, dust and asphalt fume emissions, highlighting the excellent comprehensive performance improvement and sustainable production value, and is suitable for the promotion and application of high-grade road engineering. Detailed Implementation

[0027] The invention can be further understood through the specific embodiments given below, but they are not intended to limit the invention. Example

[0028] The production process of asphalt mastic aggregate in this embodiment 1 includes the following steps: S1. Weigh 92kg of SBS modified asphalt and 8kg of lignin fiber and put them into a mixer with a mixing speed of 80rpm and a mixing temperature of 175℃ and mix for 15s to obtain asphalt slurry. S2. Weigh out the stone material consisting of 35kg of primary coarse aggregate with a particle size of 11-16mm, 35kg of secondary coarse aggregate with a particle size of 6-11mm, 10kg of tertiary coarse aggregate with a particle size of 3-6mm, 10kg of fine aggregate with a particle size of 0-3mm and 10kg of mineral powder and put it into a mixing tank at 185℃. S3. Weigh 6.5 kg of the asphalt slurry prepared in S1 and pump it into a mixing tank at 185°C. Mix it with the stone material in the mixing tank to obtain asphalt mastic crushed stone mixture. While step S3 is being performed, step S1 is repeated to prepare the next batch of asphalt slurry, so that steps S1, S2 and S3 form a continuous production process for asphalt mastic aggregate mixture, thus achieving continuous production. Example

[0029] The production process of the asphalt mastic aggregate mixture in this embodiment 2 includes the following steps: S1. Weigh 90kg of SBS modified asphalt and 10kg of lignin fiber and put them into a mixer with a mixing speed of 150rpm and a mixing temperature of 190℃ and mix for 30s to obtain asphalt slurry. S2. Weigh out the stone material consisting of 35kg of primary coarse aggregate with a particle size of 11-16mm, 35kg of secondary coarse aggregate with a particle size of 6-11mm, 8kg of tertiary coarse aggregate with a particle size of 3-6mm, 12kg of fine aggregate with a particle size of 0-3mm and 10kg of mineral powder and put it into a mixing tank at 190℃. S3. Weigh 6.0 kg of the asphalt slurry prepared in S1 and pump it into a mixing tank at 190°C. Mix it with the stone material in the mixing tank to obtain asphalt mastic crushed stone mixture. While step S3 is being performed, step S1 is repeated to prepare the next batch of asphalt slurry, so that steps S1, S2 and S3 form a continuous production process for asphalt mastic aggregate mixture, thus achieving continuous production. Example

[0030] The production process of an asphalt mastic aggregate mixture according to Embodiment 3 includes the following steps: S1. Weigh 95kg70 # Road petroleum asphalt and 5 kg of lignin fiber were respectively placed in a mixer with a mixing speed of 50 rpm and a mixing temperature of 140 ℃ and mixed for 20 seconds to obtain asphalt slurry. S2. Weigh out the stone material consisting of 35kg of primary coarse aggregate with a particle size of 11-16mm, 35kg of secondary coarse aggregate with a particle size of 6-11mm, 10kg of tertiary coarse aggregate with a particle size of 3-6mm, 10kg of fine aggregate with a particle size of 0-3mm and 10kg of mineral powder and put it into a mixing tank at 140℃. S3. Weigh 7.0 kg of the asphalt slurry prepared in S1 and pump it into a mixing tank at 140°C. Mix it with the stone material in the mixing tank to obtain asphalt mastic crushed stone mixture. While step S3 is being performed, step S1 is repeated to prepare the next batch of asphalt slurry, so that steps S1, S2 and S3 form a continuous production process for asphalt mastic aggregate mixture, thus achieving continuous production.

[0031] The basic performance test results of SBS modified asphalt in Examples 1-2 are shown in Table 1: Table 1. Basic performance test results of SBS modified asphalt Example 3 of 70 # The basic performance test results of road petroleum asphalt are shown in Table 2: Table 2 70 # Basic performance test results of road petroleum asphalt

[0032] The test methods in Tables 1 and 2 were implemented in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTGE20-2011.

[0033] Test case The performance of the asphalt mastic aggregates prepared in Examples 1-3 was tested according to the test methods in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The performance tests included: void ratio, stability, flow value, segregation loss, scattering loss, dynamic stability, freeze-thaw splitting strength ratio, residual stability, specimen bulk density, maximum theoretical density, coarse aggregate skeleton void ratio, and saturation. The test results are shown in Table 3. Table 3. Performance Test Results of Asphalt Mastic Aggregate Mixture

[0034] The results in Table 3 show that: ① Porosity: The porosity test results of the asphalt mastic aggregate mixtures in Examples 1-3 all meet the requirement of 3-4.5%, indicating that the present invention, by premixing asphalt and lignin fiber and matching aggregates of various grades, forms a reasonable porosity structure, which is both waterproof and oil-proof, and can solve the problem of unbalanced porosity distribution caused by uneven fiber dispersion in traditional processes.

[0035] ② Marshall stability and flow value: The stability test results of the asphalt mastic macadam mixtures in Examples 1-3 all far exceeded the technical requirements, and the flow value test results of Examples 1-3 were all within a reasonable range. This indicates that the process of the present invention, which premixes asphalt and fiber, can make the two bond more firmly. The asphalt slurry formed after the two are mixed and the coarse aggregate interlocking skeleton can make the asphalt mastic macadam mixture have good deformation resistance and flexibility.

[0036] ③ Segregation and Scattering Losses: The results of the segregation and scattering losses tests of the asphalt mastic aggregate mixtures in Examples 1-3 all meet the technical requirements, indicating that the asphalt and lignin fiber premixing process of the present invention can fully disperse the lignin fiber in the asphalt, avoid agglomeration, solve the problem of asphalt freeing and aggregate shedding caused by uneven dispersion of lignin fiber in the traditional process, and improve the stability of the asphalt mastic aggregate mixture.

[0037] ④ High and low temperature and water stability: The dynamic stability test results of the asphalt mastic macadam mixtures in Examples 1-3 all meet the technical requirements. Furthermore, the freeze-thaw splitting strength ratio and residual stability test results of the asphalt mastic macadam mixtures in Examples 1-3 all exceed 88%, indicating that the process of the present invention can make the asphalt mastic structure more stable, and the lignin fiber can fully play its reinforcing role. Combined with the matching of the aggregate temperature and the asphalt slurry temperature, the high temperature resistance and freeze-thaw resistance of the asphalt mastic macadam mixtures produced by the process of the present invention can be improved.

[0038] ⑤ Skeleton and Compaction: The test results of the coarse aggregate skeleton void ratio of the asphalt mastic macadam mixtures in Examples 1-3 are <VCA DRC The saturation test results of the asphalt mastic aggregate mixtures in Examples 1-3 all meet the technical requirements, indicating that the aggregate in the process of this invention adopts the gradation design of first-grade coarse aggregate, second-grade coarse aggregate and third-grade coarse aggregate, which can achieve uniform coating of asphalt slurry and form a stable interlocking skeleton and reasonable density.

[0039] ⑥ Comprehensive Analysis: The test results of all test items for the asphalt mastic aggregate mixtures in Examples 1-3 meet the technical requirements, and the test results of some items are even far better than the technical requirements. This shows that the production process of the asphalt mastic aggregate mixture of the present invention can not only save the 15s dry mixing process in the traditional process and effectively reduce energy consumption, but more importantly, the production process of the asphalt mastic aggregate mixture of the present invention can solve the problems of uneven lignin fiber dispersion and unstable performance of asphalt mastic aggregate mixture in the traditional production process, thereby achieving a simultaneous improvement in production efficiency and product performance.

[0040] Production process effect analysis The energy consumption, production cost, pollutant emissions, noise control, and overall benefits of the production process for preparing asphalt mastic aggregate in any of the above embodiments are compared with those of the standard / traditional production processes. The results are shown in Table 4. Table 4. Comparison of the effects of optimization on the production process of asphalt mastic aggregate mixture.

[0041] As shown in Table 4, the production process of the asphalt mastic aggregate of the present invention achieves significant optimization effects in many aspects by eliminating the traditional dry mixing step and pre-mixing asphalt and lignin fibers.

[0042] In terms of energy consumption and economy, due to the shortened heating time and simplified process, both fuel and electricity consumption have been substantially reduced, leading to a decrease in overall production costs. In terms of environmental protection, the premixing process effectively suppresses the emission of dust and asphalt fumes during the mixing process, so that the emission concentrations of key pollutants such as particulate matter, asphalt fumes, benzo(a)pyrene and non-methane total hydrocarbons are consistently better than the national emission standards; at the same time, the significant reduction in production noise further improves the working environment.

[0043] In terms of equipment maintenance, it directly reduces the dry friction between the stone and the mixing cylinder, significantly reducing equipment wear and corresponding maintenance costs.

[0044] In summary, this optimized process not only improves production efficiency and product performance, but also achieves multiple goals such as energy conservation, environmental compliance, and equipment protection, demonstrating outstanding comprehensive benefits and possessing significant value for widespread application.

[0045] The above description is merely an embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A production process for asphalt mastic aggregate mixture, characterized in that, The production process includes the following steps: S1. Place the asphalt and lignin fiber into a mixer and mix them evenly to obtain asphalt slurry; S2. Place the stone material composed of coarse aggregate, fine aggregate and mineral powder into the mixing tank; S3. The asphalt slurry is placed into the mixing tank and mixed with the stone material in the mixing tank to obtain asphalt mastic crushed stone mixture; While step S3 is being performed, step S1 is repeated to prepare the next batch of asphalt slurry, so that steps S1, S2 and S3 form a continuous production process for asphalt mastic aggregate mixture.

2. The production process of asphalt mastic aggregate according to claim 1, characterized in that, The content of lignin fiber is 5-10% of the total amount of the asphalt slurry.

3. The production process of asphalt mastic aggregate according to claim 1 or 2, characterized in that, The asphalt content is 5-7% of the total amount of the asphalt mastic aggregate mixture.

4. The production process of asphalt mastic aggregate according to claim 1, characterized in that, The mixer has a mixing speed of 50-150 rpm, a temperature of 140-190℃, and a mixing time of 15-30 s.

5. The production process of asphalt mastic aggregate according to claim 1, characterized in that, The temperature of the stone is 140-190℃.

6. The production process of asphalt mastic aggregate according to claim 5, characterized in that, In step S3, the asphalt slurry to aggregate ratio is 6.0-7.0%.

7. The production process of asphalt mastic aggregate according to claim 6, characterized in that, The coarse aggregate includes a first-stage coarse aggregate with a particle size of 11-16 mm, a second-stage coarse aggregate with a particle size of 6-11 mm, and a third-stage coarse aggregate with a particle size of 3-6 mm. The fine aggregate has a particle size of 0-3 mm.

8. The production process of asphalt mastic aggregate according to claim 7, characterized in that, The content of the first-grade coarse aggregate is 35% of the total stone, the content of the second-grade coarse aggregate is 35% of the total stone, the content of the third-grade coarse aggregate is 10% of the total stone, the content of the fine aggregate is 10% of the total stone, and the content of the mineral powder is 10% of the total stone.

9. The production process of asphalt mastic aggregate according to claim 7, characterized in that, The content of the first-grade coarse aggregate is 35% of the total stone, the content of the second-grade coarse aggregate is 35% of the total stone, the content of the third-grade coarse aggregate is 8% of the total stone, the content of the fine aggregate is 12% of the total stone, and the content of the mineral powder is 10% of the total stone.

10. The production process of asphalt mastic aggregate according to claim 1, characterized in that, The asphalt is modified asphalt or 70% asphalt. # asphalt.

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