Rock asphalt colloidal particles, rock asphalt colloidal particle asphalt mixture and preparation method of rock asphalt colloidal particles and asphalt mixture

Abstract

The invention discloses rock asphalt colloidal particles, a rock asphalt colloidal particle and asphalt mixture and a preparation method of the rock asphalt colloidal particles and the asphalt mixture. The rock asphalt colloidal particles comprise the following components in parts by mass: 60-100 parts of rock asphalt powder, 10-20 parts of vegetable oil, 1-5 parts of liquid tackifying resin and 15-30 parts of desulfurized waste tire rubber powder. The rock asphalt colloidal particle asphalt mixture is prepared from the following raw materials in percentage by mass: 75-90% of graded broken stone and 10-25% of rock asphalt colloidal particles, wherein the graded broken stone is prepared by mixing coarse aggregate and fine aggregate in proportion. The problem that dust pollution is easily generated in the production and use processes of traditional powdery rock asphalt is solved, the rock asphalt, the desulfurized waste tire rubber powder, the modifier and the like are subjected to compound modification to prepare a granular product, complementation of advantages and disadvantages is achieved, the excellent performance of the rock asphalt is kept, the limitation in application of the rock asphalt is overcome, and the application prospect is wide. The rock asphalt colloidal particle provided by the invention balances the high and low temperature performance of an asphalt mixture and improves the water damage resistance.

Description

Technical Field

[0001] This invention relates to the technical field of road materials, specifically to a rock asphalt granule, a rock asphalt granule asphalt mixture, and a method for preparing the same. Background Technology

[0002] Early-built highways in China commonly suffered from various pavement defects such as rutting, water damage, and wear. These defects not only reduced driving comfort and increased traffic safety risks but also resulted in significant maintenance costs. Natural rock asphalt, as an important asphalt material, has attracted widespread attention due to its excellent high-temperature resistance and rutting resistance. Compared with ordinary petroleum asphalt, rock asphalt has a higher softening point, better temperature stability, and better anti-aging properties. However, natural rock asphalt also has some limitations in practical applications: First, traditional powdered rock asphalt easily generates dust pollution during production and use, affecting the working environment and worker health; second, while rock asphalt improves high-temperature performance, it often adversely affects the low-temperature performance of asphalt mixtures.

[0003] Therefore, it is of great significance to develop a type of rock asphalt granule that can maintain the excellent properties of rock asphalt while overcoming the limitations in its application. Summary of the Invention

[0004] One of the objectives of this invention is to provide a rock asphalt granule, wherein the raw materials for preparing the rock asphalt granule include, by mass parts: 60-100 parts rock asphalt powder, 10-20 parts vegetable oil, 1-5 parts liquid tackifying resin, and 15-30 parts desulfurized waste tire rubber powder.

[0005] The second objective of this invention is to provide a method for preparing rock asphalt granules. The method involves mixing rock asphalt powder, vegetable oil, and waste tire rubber powder in a specific mass ratio, mixing them evenly in a kneader at a set temperature, and then granulating the mixture to obtain the rock asphalt granules.

[0006] The third objective of this invention is to provide a rock asphalt granule asphalt mixture, wherein the raw materials for preparing the rock asphalt granule asphalt mixture include, by mass percentage: 75-90% graded crushed stone mixed with coarse aggregate and fine aggregate in proportion, and 10-25% rock asphalt granules.

[0007] The fourth objective of this invention is to provide a method for preparing rock asphalt granule asphalt mixture, wherein graded crushed stone and rock asphalt granules are mixed at a set temperature in a mass ratio of 75-90%:10-25% to obtain rock asphalt granule asphalt mixture.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] In a first aspect, the present invention provides a rock asphalt granule, wherein the raw materials for preparing the rock asphalt granule include, by mass parts: 60-100 parts rock asphalt powder, 10-20 parts vegetable oil, 1-5 parts liquid tackifying resin, and 15-30 parts desulfurized waste tire rubber powder.

[0010] Furthermore, in this invention, the rock asphalt powder is an asphalt powder made from natural asphalt formed by petroleum in rocks through long-term geological changes and oxidation evaporation.

[0011] Preferably, the ash content of the natural asphalt is between 50% and 80%, and the passing rate of a 1.18mm sieve is ≥80%.

[0012] Furthermore, in this invention, the vegetable oil is a natural oil extracted from the seeds, fruits, germs or other parts of a plant through pressing or extraction processes.

[0013] Preferably, the natural oil has a monounsaturated fatty acid content >70%.

[0014] Preferably, the vegetable oil is tea seed oil, avocado oil, or rapeseed oil.

[0015] Furthermore, in this invention, the liquid tackifying resin is any one or a mixture of liquid petroleum resin, liquid rosin resin, and liquid terpene resin.

[0016] Furthermore, in this invention, the desulfurized waste tire rubber powder is waste tire rubber powder with a certain fineness obtained by crushing waste automobile tires.

[0017] Preferably, the waste tire rubber powder contains 40-48% isoprene rubber or at least 50% rubber hydrocarbons.

[0018] Preferably, the waste tire rubber powder has a fineness of 30-100 mesh.

[0019] Furthermore, in this invention, the desulfurized waste tire rubber powder is obtained by desulfurization using an atmospheric pressure dynamic heating tank.

[0020] Furthermore, in this invention, the desulfurized waste tire rubber powder is prepared by mixing waste tire rubber powder particles, softening oil and activator in a ratio of 90:5:5 and adding them to an atmospheric pressure dynamic heating tank. The activation is achieved by heat conduction through the tank wall of the atmospheric pressure dynamic heating tank, and a small amount of water is intermittently added to provide fire protection and improve heating uniformity, thereby removing VOCs emissions through a desulfurization activation method.

[0021] Secondly, the present invention provides a method for preparing rock asphalt granules, comprising the following steps:

[0022] A1. Weigh out the rock asphalt powder, vegetable oil, liquid thickening resin and desulfurized waste tire rubber powder according to the set ratio;

[0023] A2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the rock asphalt powder, vegetable oil, liquid thickening resin and desulfurized waste tire rubber powder weighed in A1 into the kneader in sequence.

[0024] A3. Start the kneader to thoroughly mix the rock asphalt powder, vegetable oil, liquid tackifying resin, and desulfurized waste tire rubber powder to obtain the first mixture; the mixing time is 30 minutes.

[0025] A4. The first mixture obtained in A3 is fed into an extruder, extruded and granulated by the extruder to obtain rock asphalt granules.

[0026] Thirdly, the present invention provides a rock asphalt granule asphalt mixture, wherein the raw materials for preparing the rock asphalt granule asphalt mixture include, by mass percentage: 75-90% graded crushed stone mixed from coarse aggregate and fine aggregate in proportion, and 10-25% rock asphalt granules.

[0027] Furthermore, in this invention, the mixing ratio of coarse aggregate and fine aggregate is 0-3:32%, or 3-5:14%, or 5-10:26%, or 10-15:28%.

[0028] Furthermore, in this invention, the coarse aggregate is made of hard, wear-resistant, clean, and near-cubic crushed stone, and the fine aggregate is made of clean, dry, unweathered, and impurity-free manufactured sand.

[0029] Furthermore, in this invention, the rock asphalt granule asphalt mixture is prepared by mixing graded crushed stone and rock asphalt granules at a set temperature in a mass ratio of 75~90:10~25%.

[0030] Fourthly, the present invention provides a method for preparing rock asphalt granular asphalt mixture, comprising the following steps:

[0031] B1. Mix the coarse aggregate and fine aggregate evenly according to the set ratio to obtain well-mixed graded crushed stone;

[0032] B2. Place the well-mixed graded crushed stone from B1 into a 200℃ oven for preheating and use.

[0033] B3. Add the preheated graded crushed stone and rock asphalt granules from B2 to the asphalt mixing plant according to the set ratio, and mix them at the set temperature of 190℃ and time of 50s to obtain rock asphalt granule rock asphalt mixture.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] (1) The rock asphalt granules provided by the present invention are obtained by mixing rock asphalt powder, vegetable oil, liquid tackifying resin and desulfurized waste tire rubber powder in a kneader with a specific ratio and a set temperature, and then granulating them. This solves the problem of dust pollution that is easy to be generated during the production and use of traditional powdered rock asphalt.

[0036] (2) The rock asphalt granules provided by the present invention are made into granular products by combining rock asphalt with desulfurized waste tire rubber powder, modifiers and other materials. This achieves the complementarity of advantages and disadvantages, maintaining the excellent performance of rock asphalt while overcoming its limitations in application. Among them, rock asphalt improves high-temperature performance, and desulfurized waste tire rubber powder improves low-temperature performance, solving the problem of low-temperature performance deterioration caused by single rock asphalt modification.

[0037] (3) The rock asphalt granules provided by the present invention contain desulfurized waste tire rubber powder obtained by desulfurization in an atmospheric pressure dynamic heating tank. This not only increases the amount of waste tire rubber powder used, but also reduces the odor of waste tire rubber powder and improves the construction environment.

[0038] (4) The rock asphalt granule asphalt mixture provided by the present invention balances the high and low temperature performance of the asphalt mixture through composite modification technology. At the same time, the addition of liquid tackifying resin improves the water damage resistance performance, providing a new type of pavement material with excellent performance, convenient construction and environmental friendliness for highway construction and maintenance.

[0039] (5) The rock asphalt granule asphalt mixture provided by the present invention is higher than the requirements of the current asphalt mixture technical specifications. Under the optimal mix design, the dynamic stability is >6000 times / mm, the freeze-thaw splitting tensile strength ratio is >80%, and the low-temperature bending failure strain is >3000µε. Detailed Implementation

[0040] To make the technical means, creative features, and achieved objectives and effects of this invention readily understandable, the technical solution of this invention will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] The present invention will be further illustrated below by way of examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0042] Sources of raw materials used in the examples:

[0043] Waste tire rubber powder (i.e., waste tire rubber powder): Hubei Anjie Road & Bridge Technology Co., Ltd.

[0044] Rock asphalt powder: Hubei Anjie Road & Bridge Technology Co., Ltd.

[0045] 70# Asphalt: Shandong Jingbo Petrochemical Co., Ltd.

[0046] Vegetable oil: Sichuan Fuyuda Grain and Oil Co., Ltd.

[0047] Basalt rock material: Lingshou County Chenyang Mineral Products Co., Ltd.

[0048] Lauric acid: Guangzhou Fufeng Chemical Technology Co., Ltd.

[0049] Liquid rosin resin: Guangzhou Xinghang Chemical Technology Co., Ltd.

[0050] The desulfurized waste tire rubber powder provided in this embodiment comprises, by weight, 90 parts of 40-mesh waste tire rubber powder, 5 parts of softened oil (rapeseed oil), and 5 parts of activator (lauric acid). The specific preparation steps for the desulfurized waste tire rubber powder are as follows:

[0051] A. Waste tire rubber powder is conveyed to a desulfurization bed with a length of 4m using a conveyor belt, and the continuous feeding and discharging efficiency of the desulfurization bed is controlled at 1t / h.

[0052] B. The waste tire rubber powder is heated in the desulfurization bed, making full use of high-temperature steam to de-powder the waste tire rubber powder inside the desulfurization bed and rapidly raise the temperature to 270℃; under this temperature, the steam pressure is 0.6-1 MPa;

[0053] C. Utilizing the combined effect of "hot steam boiling + motor vibration", the vibration force generated by the vibrating motor installed under the desulfurization bed causes the desulfurization bed to vibrate, allowing the waste tire rubber powder to jump forward under the action of the vibration force in a given direction, while high-temperature steam input from the bottom of the desulfurization bed enters the desulfurization bed.

[0054] D. Allow 40-mesh waste tire rubber powder, softened oil, and activator to enter the desulfurization bed through the feed inlet at the front end of the desulfurization bed. Use steam to maintain the humidity of the 40-mesh waste tire rubber powder, softened oil, and activator, preventing them from charring at high temperatures. Ensure that the 40-mesh waste tire rubber powder, softened oil, and activator on the desulfurization bed have full orthogonal contact with the high-temperature steam introduced from the bottom of the desulfurization bed for heat transfer, heating the 40-mesh waste tire rubber powder, softened oil, and activator to the critical temperature of 270℃, achieving the desulfurization temperature conditions; desulfurization time: 2 hours.

[0055] E. The desulfurized 40-mesh waste tire rubber powder is fed into the subsequent drying and dehumidification equipment through the discharge port of the desulfurization bed to obtain desulfurized waste tire rubber powder.

[0056] Example 1

[0057] This embodiment provides a rock asphalt granule, the raw materials for which are prepared by mass include: 70 parts rock asphalt powder, 10 parts rapeseed oil, 4 parts liquid rosin resin and 20 parts desulfurized waste tire rubber powder.

[0058] Specifically, the rock asphalt granules provided in this embodiment are prepared by the following steps:

[0059] A1. Weigh out the raw materials according to the set ratio: 70 parts rock asphalt powder, 10 parts rapeseed oil, 4 parts liquid rosin resin and 20 parts desulfurized waste tire rubber powder;

[0060] A2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the weighed rock asphalt powder, rapeseed oil, liquid rosin resin and desulfurized waste tire rubber powder into the kneader in sequence.

[0061] A3. Start the kneader to thoroughly mix the above-mentioned rock asphalt powder, rapeseed oil, liquid rosin resin and desulfurized waste tire rubber powder to obtain the first mixture; wherein, the mixing time is 30 minutes;

[0062] A4. The first mixture prepared above is fed into an extruder, extruded and granulated by the extruder to obtain rock asphalt granules.

[0063] Example 2

[0064] This embodiment provides a rock asphalt granule, the raw materials for which, by mass, include: 60 parts rock asphalt powder, 20 parts rapeseed oil, 4 parts liquid rosin resin, and 20 parts desulfurized waste tire rubber powder.

[0065] Specifically, the rock asphalt granules provided in this embodiment are prepared by the following steps:

[0066] A1. Weigh out the raw materials according to the set ratio: 60 parts rock asphalt powder, 20 parts rapeseed oil, 4 parts liquid rosin resin and 20 parts desulfurized waste tire rubber powder;

[0067] A2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the weighed rock asphalt powder, rapeseed oil, liquid rosin resin and desulfurized waste tire rubber powder into the kneader in sequence.

[0068] A3. Start the kneader to thoroughly mix the rock asphalt powder, vegetable oil, liquid tackifying resin and desulfurized waste tire rubber powder to obtain the first mixture; the mixing time is 30 minutes.

[0069] A4. The first mixture prepared above is fed into an extruder, extruded and granulated by the extruder to obtain rock asphalt granules.

[0070] Example 3

[0071] This embodiment provides a rock asphalt granule, the raw materials for which are prepared by mass include: 80 parts rock asphalt powder, 10 parts rapeseed oil, 4 parts liquid rosin resin and 10 parts desulfurized waste tire rubber powder.

[0072] Specifically, the rock asphalt granules provided in this embodiment are prepared by the following steps:

[0073] A1. Weigh out the raw materials according to the set ratio: 80 parts rock asphalt powder, 10 parts rapeseed oil, 4 parts liquid rosin resin and 10 parts desulfurized waste tire rubber powder;

[0074] A2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the weighed rock asphalt powder, rapeseed oil, liquid rosin resin and desulfurized waste tire rubber powder into the kneader in sequence.

[0075] A3. Start the kneader to thoroughly mix the rock asphalt powder, vegetable oil, liquid tackifying resin and desulfurized waste tire rubber powder to obtain the first mixture; the mixing time is 30 minutes.

[0076] A4. The first mixture prepared above is fed into an extruder, extruded and granulated by the extruder to obtain rock asphalt granules.

[0077] Comparative Example 1

[0078] This comparative example provides a rock asphalt granule, the raw materials for which, by mass, include: 80 parts rock asphalt powder and 20 parts Jingbo 70# asphalt.

[0079] Specifically, the rock asphalt granules provided in this embodiment are prepared by the following steps:

[0080] A1. Weigh out the raw materials according to the set ratio: 80 parts rock asphalt powder and 20 parts Jingbo 70# asphalt;

[0081] A2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the weighed rock asphalt powder and Jingbo 70# asphalt into the kneader in sequence;

[0082] A3. Start the kneader to thoroughly mix the rock asphalt powder and Jingbo 70# asphalt to obtain the first mixture; the mixing time is 30 minutes.

[0083] A4. The first mixture prepared above is fed into an extruder, extruded and granulated by the extruder to obtain rock asphalt granules.

[0084] Comparative Example 2

[0085] This comparative example provides a rock asphalt granule, the raw materials for which, by mass parts, include: 80 parts of Jingbo 70# asphalt and 20 parts of desulfurized waste tire rubber powder.

[0086] Specifically, the rock asphalt granules provided in this embodiment are prepared by the following steps:

[0087] S1. Weigh out each raw material according to the set ratio: 80 parts of Jingbo 70# asphalt and 20 parts of desulfurized waste tire rubber powder;

[0088] S2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the weighed rock asphalt powder and Jingbo 70# asphalt into the kneader in sequence;

[0089] S3. Start the kneader to fully mix the above rock asphalt powder and Jingbo 70# asphalt to obtain the first mixture; the mixing time is 30 minutes.

[0090] S4. The first mixture prepared above is fed into an extruder, and the mixture is extruded, shaped, and granulated by shearing to obtain rock asphalt granules.

[0091] The rock asphalt particles obtained in Examples 1, 2, 3, Comparative Example 1, and Comparative Example 2 are denoted as S1, S2, S3, D1, and D2, respectively. The rock asphalt particle samples were heated to 180°C to test their softening point, elastic recovery (25°C), ductility (5°C), and rutting resistance factor (60°C G). * The results of the / sinδ) test for each rock asphalt particle are shown in Table 1 below:

[0092] Table 1 project unit S1 S2 S3 D1 D2 softening point ℃ 87 77 90 73 65 Elastic recovery (25℃) % 90 80 72 30 60 Ductility (5℃) cm 15 20 10 0 7 60℃ anti-rutting factor kPa 13 9 11 6 8

[0093] The test results in Table 1 show that, compared to rock asphalt and rubber asphalt, rock asphalt granules extruded and granulated by kneading rock asphalt, desulfurized waste tire rubber powder, rapeseed oil, and liquid rosin resin have higher softening points and low-temperature ductility, while also exhibiting good elastic recovery and rutting resistance. By adjusting the proportions of each raw material, S1 rock asphalt granules, compared to samples S2 and S3, have a higher softening point, a higher rutting resistance factor at 60℃, and better elastic recovery performance, while also possessing good low-temperature ductility.

[0094] (I) Using basalt aggregate and referring to AC13 gradation, graded crushed stone was prepared. The rock asphalt granules obtained in the above examples and comparative examples were mixed with the graded crushed stone and prepared asphalt mixtures according to the mass ratio of graded crushed stone to rock asphalt granules of 75:25. The mixtures were denoted as S1-A, S2-A, S3-A, D1-A, and D2-A. The dynamic stability (times / mm), Marshall stability (kN), residual stability (%), freeze-thaw splitting strength ratio (%), and low-temperature flexural failure strain index (µε) of each asphalt mixture were tested. The specific test results are shown in Table 2 below:

[0095] Table 2 project unit S1-A S2-A S3-A D1-A D2-A Dynamic stability times / mm 7300 4600 7700 4800 3000 Marshall stability kN 7.2 4.4 7.1 4.7 3.8 Residual stability % 80 65 72 66 61 Freeze-thaw splitting strength ratio % 77 63 70 59 56 Low-temperature bending failure strain µε 2890 2450 2540 2000 1960

[0096] (II) Using basalt aggregate and referring to AC13 gradation, graded crushed stone was prepared. The rock asphalt granules obtained in the above examples and comparative examples were mixed with the graded crushed stone and prepared asphalt mixtures at a mass ratio of graded crushed stone to rock asphalt granules of 83:17. The mixtures were designated as S1-B, S2-B, S3-B, D1-B, and D2-B. The dynamic stability (times / mm), Marshall stability (kN), residual stability (%), freeze-thaw splitting strength ratio (%), and low-temperature flexural failure strain index (µε) of each asphalt mixture were tested. The specific test results are shown in Table 3 below.

[0097] Table 3 project unit S1-B S2-B S3-B D1-B D2-B Dynamic stability times / mm 8600 6700 9400 6300 4300 Marshall stability kN 8.5 6.3 8.7 6.1 5.4 Residual stability % 94 92 86 85 86 Freeze-thaw splitting strength ratio % 91 90 85 76 80 Low-temperature bending failure strain µε 3400 3500 3100 2600 2800

[0098] (III) Using basalt aggregate and referring to AC13 gradation, graded crushed stone was prepared. The rock asphalt granules obtained from the above embodiments and comparative examples were mixed with the graded crushed stone and prepared asphalt mixtures at a mass ratio of graded crushed stone to rock asphalt granules of 90:10. The mixtures were denoted as S1-C, S2-C, S3-C, D1-C, and D2-C. The dynamic stability (cycles / mm), Marshall stability (kN), residual stability (%), freeze-thaw splitting strength ratio (%), and low-temperature flexural failure strain index (µε) of each asphalt mixture were tested. The specific test results are shown in Table 4 below:

[0099] Table 4 project unit S1-C S2-C S3-C D1-C D2-C Dynamic stability times / mm 6100 5300 6900 4400 3200 Marshall stability kN 6.4 5.0 6.4 4.3 4.0 Residual stability % 70 74 65 60 65 Freeze-thaw splitting strength ratio % 68 72 63 53 60 Low-temperature bending failure strain µε 2550 2800 2290 1820 2100

[0100] The test results in Table 2-4 above show that the asphalt mixtures prepared from the rock asphalt granules obtained in Examples 1-3 have better high and low temperature performance and water damage resistance than the asphalt mixtures prepared from the rock asphalt granules obtained in Comparative Examples 1 and 2. In particular, when the mass ratio of rock asphalt, vegetable oil and waste rubber powder is 70:10:20, and the mass ratio of graded crushed stone to rock asphalt granules is 83:17, its high and low temperature performance is even better, and it also has good water damage resistance. The high and low temperature performance can be obtained by the freeze-thaw splitting strength ratio and the low temperature flexural failure strain, and the water damage resistance can be obtained by the residual stability.

[0101] Finally, it should be noted that the above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A type of rock asphalt granules, characterized in that, The raw materials for preparing the rock asphalt granules include, by mass parts: 60-100 parts rock asphalt powder, 10-20 parts vegetable oil, 1-5 parts liquid tackifying resin, and 15-30 parts desulfurized waste tire rubber powder.

2. The rock bitumen granules according to claim 1, characterized in that, The rock asphalt powder is an asphalt powder made from natural asphalt formed from petroleum in rocks through long-term geological changes and oxidation evaporation.

3. The rock asphalt granules according to claim 2, characterized in that, The ash content of the natural asphalt is between 50% and 80%, and the passing rate of a 1.18mm sieve is ≥80%.

4. The rock bitumen granules according to claim 1, characterized in that, The vegetable oil is a natural oil extracted from the seeds, fruits, germs or other parts of a plant through pressing or extraction processes.

5. The rock bitumen granules according to claim 4, characterized in that, The natural oil contains >70% monounsaturated fatty acids.

6. The rock bitumen granules according to claim 4, characterized in that, The vegetable oil is tea seed oil, avocado oil, or rapeseed oil.

7. The rock bitumen granules according to claim 1, characterized in that, The liquid tackifying resin is any one or a mixture of liquid petroleum resin, liquid rosin resin, and liquid terpene resin.

8. The rock asphalt granules according to claim 1, characterized in that, The desulfurized waste tire rubber powder is waste tire rubber powder with a certain fineness obtained by crushing waste automobile tires.

9. The rock bitumen granules according to claim 8, characterized in that, The waste tire rubber powder contains 40-48% isoprene rubber or at least 50% rubber hydrocarbons.

10. The rock bitumen granules according to claim 8, characterized in that, The fineness of the waste tire rubber powder is 30~100 mesh.

11. The rock bitumen granules according to claim 8, characterized in that, The desulfurized waste tire rubber powder is obtained by desulfurization in an atmospheric pressure dynamic heating tank.

12. The rock bitumen granules according to claim 11, characterized in that, The desulfurized waste tire rubber powder is prepared by mixing waste tire rubber powder particles, softening oil and activator in a ratio of 90:5:5 and then adding them to an atmospheric pressure dynamic heating tank. The activation is achieved by heat conduction through the tank wall of the atmospheric pressure dynamic heating tank, and a small amount of water is added intermittently to provide fire protection and improve heating uniformity, thereby removing VOCs emissions.

13. A method for preparing rock asphalt granules according to any one of claims 1 to 12, characterized in that, Includes the following steps: A1. Weigh out the rock asphalt powder, vegetable oil, liquid thickening resin and desulfurized waste tire rubber powder according to the set ratio; A2. Turn on the power of the kneader, set the sample preparation temperature to 200℃, and add the rock asphalt powder, vegetable oil, liquid thickening resin and desulfurized waste tire rubber powder weighed in A1 into the kneader in sequence. A3. Start the kneader to thoroughly mix the rock asphalt powder, vegetable oil, liquid tackifying resin, and desulfurized waste tire rubber powder to obtain the first mixture; the mixing time is 30 minutes. A4. The first mixture obtained in A3 is fed into an extruder, extruded and granulated by the extruder to obtain rock asphalt granules.

14. A rock asphalt granule asphalt mixture, characterized in that, The raw materials for preparing the rock asphalt granule asphalt mixture include, by mass percentage: 75-90% graded crushed stone, which is a mixture of coarse and fine aggregates in a certain proportion, and 10-25% rock asphalt granules as described in any one of claims 1-12.

15. The rock asphalt granular asphalt mixture according to claim 14, characterized in that, The mixing ratio of coarse aggregate and fine aggregate is 0-3:32%, or 3-5:14%, or 5-10:26%, or 10-15:28%.

16. The rock asphalt granular asphalt mixture according to claim 15, characterized in that, The coarse aggregate is made of hard, wear-resistant, clean, and near-cubic crushed stone, while the fine aggregate is made of clean, dry, unweathered, and impurity-free manufactured sand.

17. A method for preparing rock asphalt granular asphalt mixture according to any one of claims 14-16, characterized in that, Includes the following steps: B1. Mix the coarse aggregate and fine aggregate evenly according to the set ratio to obtain well-mixed graded crushed stone; B2. Place the well-mixed graded crushed stone from B1 into a 200℃ oven for preheating and use. B3. Add the preheated graded crushed stone and rock asphalt granules from B2 to the asphalt mixing plant according to the set ratio, and mix them at the set temperature of 190℃ and time of 50s to obtain rock asphalt granule rock asphalt mixture.