Preparation method of natural gravel smooth surface and asphalt interface modifier

Abstract

The invention relates to the technical field of modifier preparation, and discloses a natural gravel smooth surface and asphalt interface modifier preparation method, which comprises: collecting slaked lime, synthetic resin powder and polyester fiber as modifier raw materials; all the raw materials are pretreated through drying treatment, and the dried and pure raw materials are obtained; the slaked lime is screened through a screen, large-particle substances are removed, and slaked lime powder is obtained. According to the preparation method of the natural gravel smooth surface and asphalt interface modifier, all the raw materials are pretreated through drying treatment, the purpose of removing excessive moisture is achieved, and the moisture content of slaked lime, synthetic resin powder and polyester fibers is guaranteed to be lower than 0.5% by accurately controlling the drying temperature and time of different materials; and the slaked lime is screened by adopting a sieve, so that large-particle substances are removed, and uniform slaked lime powder is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of modifier preparation, in particular to a method for preparing a natural gravel smooth surface and asphalt interface modifier. Background Art

[0002] Modifier preparation refers to the process of mixing and processing raw materials such as slaked lime, synthetic resin powder and polyester fiber in a specific proportion into a new material through scientific methods and precise process flow. The process includes key steps such as drying, screening, high-speed mixing and granulation, aiming to significantly improve the adhesion between the smooth surface of natural gravel and asphalt, while enhancing its durability and ability to adapt to different environmental conditions.

[0003] However, in the prior art, uncrushed natural gravel becomes round and smooth due to long-term water erosion, resulting in weak adhesion of asphalt on its surface. After being soaked in water, the interface is prone to natural peeling, affecting the quality and durability of the road. In addition, the existing anti-stripping agents on the market are mainly designed for crushed aggregates, and are basically ineffective for the smooth interface of natural gravel. In addition, in the construction of roads using natural gravel as the base material, there is a lack of effective modification methods to enhance its bonding performance with asphalt. At the same time, the prior art usually provides standardized products, which fail to be adjusted according to the climatic conditions (such as rainy, hot or cold) and traffic flow characteristics of different regions, resulting in poor application effects in certain specific environments. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for preparing a natural gravel smooth surface and asphalt interface modifier, comprising:

[0007] Collect slaked lime, synthetic resin powder and polyester fiber as raw materials of modifier;

[0008] All raw materials are pre-treated by drying to obtain dry and pure raw materials;

[0009] The slaked lime is screened by sieving to remove large particles to obtain slaked lime powder;

[0010] The mixture is obtained by fully mixing the slaked lime, synthetic resin powder and polyester fiber in a selected ratio using a high-speed mixer;

[0011] The mixture is granulated by a rotary drum granulator, and the mixed powder is made into particles of a certain specification to obtain modifier particles;

[0012] By using regional characteristic analysis to evaluate the climate conditions and traffic flow factors in the target application area, the specific formula of the modifier is adjusted according to the regional characteristics to obtain a customized modifier solution;

[0013] The performance of the prepared modifier is verified by using performance testing methods, and various indicators of the modifier are confirmed.

[0014] As a further solution of the present invention: the step of collecting slaked lime, synthetic resin powder and polyester fiber as raw materials of the modifier is as follows:

[0015] Use high purity slaked lime;

[0016] Select synthetic resin powder which is made by mixing and grinding PE wax, sodium hydroxide, sodium stearate, potassium stearate, ammonium chloride and amino silicone resin in a specific proportion;

[0017] Choose polyester fiber with a length of 6-18mm;

[0018] The mixing ratio is 50% slaked lime, 30% synthetic resin and 20% polyester fiber.

[0019] As a further solution of the present invention: all raw materials are pre-treated by drying to obtain dry and pure raw materials, and the specific steps are as follows:

[0020] The collected slaked lime, synthetic resin powder and polyester fiber are placed in special drying containers respectively;

[0021] Set the drying temperature according to the characteristics of different materials;

[0022] For slaked lime, use low temperature drying at 60°C to 80°C;

[0023] For synthetic resin powder and polyester fiber, the heating condition is set at 40℃ to 60℃;

[0024] The slaked lime is dried for 24 hours, the synthetic resin powder is dried for 12 hours, and the polyester fiber is dried for 6 to 8 hours until the final moisture content is less than 0.5%.

[0025] As a further solution of the present invention: the slaked lime is screened by sieving to remove large particles to obtain slaked lime powder, and the specific steps are:

[0026] Firstly, the dried slaked lime is taken out from the drying container for screening;

[0027] Choose a sieve with a pore size between 0.075 mm and 0.6 mm;

[0028] Install a vibrating screen and adjust the speed and amplitude of the screen so that the material can be separated into particles of different sizes on the screen;

[0029] Large particles of slaked lime that fail to pass through the screen are collected separately and further ground.

[0030] As a further solution of the present invention: the slaked lime, synthetic resin powder and polyester fiber of the selected proportion are fully mixed by a high-speed mixer to obtain a mixture, and the specific steps are as follows:

[0031] The dried and sieved slaked lime, synthetic resin powder and polyester fiber are weighed in a ratio of 50% slaked lime, 30% synthetic resin powder and 20% polyester fiber and placed in a feed hopper of a high-speed mixer respectively;

[0032] Select a high-speed mixer, set the mixer speed to 1000 to 1500 rpm, and adjust the mixing time to 15 to 20 minutes;

[0033] Turn on the high-speed mixer to make the materials rotate rapidly under strong mechanical stirring;

[0034] The optimization formula is introduced to guide the parameter optimization in the mixing process, and the expression is:

[0035]

[0036] Where: M is the mixing efficiency index, A is the water absorption rate of slaked lime, B represents the cohesive force index of synthetic resin powder, C is the climate factor, T is the temperature during mixing, D is the durability index, E is the elastic modulus, and F is the average length of polyester fiber;

[0037] During the mixing process, the temperature change in the mixer is monitored in real time to ensure that it does not exceed 60°C. At the same time, the mixing efficiency index M is used to optimize the mixing effect by adjusting the speed and time to obtain a mixture.

[0038] As a further solution of the present invention: the mixture is granulated by a rotary drum granulator, and the mixed powder is made into particles of a certain specification to obtain modifier particles, and the specific steps are:

[0039] Transfer the materials fully mixed by the high-speed mixer to the feed hopper of the drum granulator;

[0040] Choose a drum granulator, set the drum diameter to 1 to 2 meters, and control the speed between 5 and 10 rpm;

[0041] Adding water during the preparation process helps the powder to form particles better;

[0042] Turn on the drum granulator to make the materials tumble and collide continuously in the rotating drum, and gradually form particles in the process.

[0043] As a further solution of the present invention: the climate conditions and traffic flow factors of the target application area are evaluated by adopting regional characteristic analysis, and the specific formula of the modifier is adjusted according to the regional characteristics to obtain a customized modifier solution. The specific steps are as follows:

[0044] Collect historical meteorological data of the target application area, including annual average temperature, extreme temperature range, annual precipitation, and humidity changes;

[0045] Obtain road traffic flow information in the area;

[0046] Based on the collected meteorological data, assess the main climate characteristics of the target area;

[0047] Analyzing road traffic flow data, high traffic flow sections require more wear-resistant and tougher modifier formulas;

[0048] For lightly used roads, the formula can be simplified to reduce costs;

[0049] Expressions are introduced during the formulation adjustment process to ensure that the modifier is suitable for the specific application environment.

[0050] As a further solution of the present invention: the performance of the prepared modifier is verified by using a performance testing method, and various indicators of the modifier are confirmed, and the specific steps are:

[0051] Collect modifier samples after drying, sieving, mixing and granulation;

[0052] The adhesion test device was used to evaluate the adhesion of the modifier on the smooth surface of natural gravel. Specifically, the modifier was applied to the pre-prepared gravel sample and its adhesion strength was measured after immersion in water for 24 h.

[0053] The standard specimen made of the modifier is placed in a freeze-thaw cycle test chamber, and the splitting strength change of the specimen is measured after a cycle from -20℃ to +60℃.

[0054] The deformation resistance of the modifier under simulated traffic load is measured using a dynamic stability tester at a temperature of 60°C to 80°C.

[0055] The modified specimens were placed in a low temperature environment of -20°C and subjected to gradually increasing tensile stress until the specimens were destroyed;

[0056] The compressive strength tester was used to measure the bonding strength inside the modifier to ensure that it was not less than 0.3 MPa.

[0057] As a further solution of the present invention: the ratio of each component in the modifier is adjusted according to the solution index S, as follows:

[0058] Increase the proportion of waterproofing additives in rainy areas;

[0059] Increase the proportion of heat-resistant components in synthetic resins under high temperature conditions;

[0060] Enhances material wear resistance in high traffic areas.

[0061] As a further solution of the present invention: an expression is introduced during the formulation adjustment process to ensure that the modifier is adapted to a specific application environment, and the expression is:

[0062]

[0063] Among them, S is the solution index; H represents the humidity factor, K represents the traffic intensity index, L is the minimum temperature, M is the material stability index, N is the natural durability, O is the optimization factor, and P is the particle size.

[0064] Compared with the prior art, the present invention has the following beneficial effects:

[0065] By pretreating all raw materials through drying treatment, the purpose of removing excess moisture is achieved. By accurately controlling the drying temperature and time of different materials, the moisture content of slaked lime, synthetic resin powder and polyester fiber is ensured to be lower than 0.5%, thereby improving the overall performance of the modifier. By screening the slaked lime through screening, large particles are removed and uniform slaked lime powder is obtained. By using a high-speed mixer to fully mix the slaked lime, synthetic resin powder and polyester fiber in the selected ratio, the uniform distribution of each component is achieved. By adjusting the speed and time to optimize the mixing effect, a uniformly dispersed mixture is finally obtained, which not only enhances the consistency and reliability of the modifier, but also improves its adhesion performance and long-term stability in practical applications. By using a rotary drum granulator to granulate the mixture, the mixed powder is made into particles of a certain specification, thereby achieving standardized production of modifier particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 The present invention is a flow chart of a method for preparing a natural gravel smooth surface and asphalt interface modifier. DETAILED DESCRIPTION

[0067] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0068] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0069] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0070] Example 1

[0071] See also Figure 1 , which is the first embodiment of the present invention, provides a method for preparing a natural gravel smooth surface and asphalt interface modifier, comprising:

[0072] S1, collecting slaked lime, synthetic resin powder and polyester fiber as raw materials of modifier;

[0073] Furthermore, high purity slaked lime is used;

[0074] Select synthetic resin powder which is made by mixing and grinding PE wax, sodium hydroxide, sodium stearate, potassium stearate, ammonium chloride and amino silicone resin in a specific proportion;

[0075] Choose polyester fiber with a length of 6-18mm;

[0076] The mixing ratio is 50% slaked lime, 30% synthetic resin and 20% polyester fiber.

[0077] It should be noted that the selection of high-purity slaked lime, synthetic resin powder with a specific composition ratio and polyester fiber of a specific length is based on their superior performance in improving the adhesion between the smooth surface of natural gravel and asphalt interface. The selection of materials not only ensures the basic quality of the modifier, but also provides a reliable material basis for subsequent mixing and application. In addition, the ratio of 50% slaked lime, 30% synthetic resin and 20% polyester fiber is the best ratio verified by many experiments, which can achieve the best bonding effect and durability while ensuring cost-effectiveness.

[0078] S2. Pre-treating all raw materials by drying to obtain dry and pure raw materials;

[0079] Furthermore, the collected slaked lime, synthetic resin powder and polyester fiber are placed in dedicated drying containers respectively;

[0080] Set the drying temperature according to the characteristics of different materials;

[0081] For slaked lime, use low temperature drying at 60°C to 80°C;

[0082] For synthetic resin powder and polyester fiber, the heating condition is set at 40℃ to 60℃;

[0083] The slaked lime is dried for 24 hours, the synthetic resin powder is dried for 12 hours, and the polyester fiber is dried for 6 to 8 hours until the final moisture content is less than 0.5%.

[0084] It should be noted that the drying process is to remove excess moisture from the raw materials to prevent it from affecting the performance of the modifier during subsequent processing. Different materials use different drying temperatures and times to ensure their respective optimal drying effects while avoiding damage to the physical and chemical properties of the material itself due to overheating. The final moisture content standard of less than 0.5% is set according to industry specifications to ensure the stability and reliability of the modifier in practical applications.

[0085] S3, screening the slaked lime by sieving to remove large particles to obtain slaked lime powder;

[0086] Furthermore, the dried slaked lime is first taken out from the drying container for screening;

[0087] Choose a sieve with a pore size between 0.075 mm and 0.6 mm;

[0088] Install a vibrating screen and adjust the speed and amplitude of the screen so that the material can be separated into particles of different sizes on the screen;

[0089] Large particles of slaked lime that fail to pass through the screen are collected separately and further ground.

[0090] It should be noted that the screening step is intended to remove large particles of matter present in slaked lime, ensure its uniform distribution and enhance its combination with other ingredients. The sieve with a pore size between 0.075 mm and 0.6 mm can effectively separate particles of different sizes. The large particles of slaked lime that fail to pass through the sieve are collected separately and further ground to ensure that all slaked lime entering the next step is fine and uniform powder.

[0091] S4, fully mixing the slaked lime, synthetic resin powder and polyester fiber in the selected ratio by using a high-speed mixer to obtain a mixture;

[0092] Furthermore, the dried and sieved slaked lime, synthetic resin powder and polyester fiber are weighed in a ratio of 50% slaked lime, 30% synthetic resin powder and 20% polyester fiber and placed in a feed hopper of a high-speed mixer respectively;

[0093] Select a high-speed mixer, set the mixer speed to 1000 to 1500 rpm, and adjust the mixing time to 15 to 20 minutes;

[0094] Turn on the high-speed mixer to make the materials rotate rapidly under strong mechanical stirring;

[0095] The optimization formula is introduced to guide the parameter optimization in the mixing process, and the expression is:

[0096]

[0097] Where: M is the mixing efficiency index, A is the water absorption rate of slaked lime, B represents the cohesive force index of synthetic resin powder, C is the climate factor, T is the temperature during mixing, D is the durability index, E is the elastic modulus, and F is the average length of polyester fiber;

[0098] During the mixing process, the temperature change in the mixer is monitored in real time to ensure that it does not exceed 60°C. At the same time, the mixing efficiency index M is used to optimize the mixing effect by adjusting the speed and time to obtain a mixture.

[0099] It should be noted that the selection of the high-speed mixer and its parameter setting are to ensure that the various components can fully contact and be evenly distributed, thereby forming a mixture with excellent performance. The introduced optimization formula is used to guide the parameter adjustment during the mixing process to ensure that the ideal mixing efficiency can be achieved in actual operation. Real-time monitoring of temperature changes and adjustment using mixing efficiency indicators make the entire mixing process more scientific and precise, thereby ensuring the high quality of the final product.

[0100] S5, granulating the mixture by using a drum granulator, and making the mixed powder into particles of a certain specification to obtain modifier particles;

[0101] Furthermore, the material fully mixed by the high-speed mixer is transferred to the feed hopper of the drum granulator;

[0102] Choose a drum granulator, set the drum diameter to 1 to 2 meters, and control the speed between 5 and 10 rpm;

[0103] Adding water during the preparation process helps the powder to form particles better;

[0104] Turn on the drum granulator to make the materials tumble and collide continuously in the rotating drum, and gradually form particles in the process.

[0105] It should be noted that the selection of the drum granulator and its parameter setting are to ensure that the material can form uniform and consistent particles under appropriate conditions, add an appropriate amount of water to help the powder to form better, and optimize the particle size and shape by controlling the drum diameter and speed. This step not only improves the stability of the modifier, but also facilitates subsequent packaging and transportation, while also ensuring the optimal performance of the modifier in actual applications.

[0106] S6. By using regional characteristic analysis to evaluate the climate conditions and traffic flow factors in the target application area, the specific formula of the modifier is adjusted according to the regional characteristics to obtain a customized modifier solution;

[0107] Furthermore, historical meteorological data of the target application area is collected, including annual average temperature, extreme temperature range, annual precipitation, and humidity changes;

[0108] Obtain road traffic flow information in the area;

[0109] Based on the collected meteorological data, assess the main climate characteristics of the target area;

[0110] Analyzing road traffic flow data, high traffic flow sections require more wear-resistant and tougher modifier formulas;

[0111] For lightly used roads, the formula can be simplified to reduce costs;

[0112] Expressions are introduced during the formulation adjustment process to ensure that the modifier is suitable for the specific application environment;

[0113] Increase the proportion of waterproofing additives in rainy areas;

[0114] Increase the proportion of heat-resistant components in synthetic resins under high temperature conditions;

[0115] Enhanced material wear resistance in high traffic areas;

[0116] The expression introduced during the formulation adjustment process ensures that the modifier is suitable for the specific application environment. The expression is:

[0117]

[0118] Among them, S is the solution index; H represents the humidity factor, K represents the traffic intensity index, L is the minimum temperature, M is the material stability index, N is the natural durability, o is the optimization factor, and P is the particle size.

[0119] It should be noted that regional characteristic analysis and customized formula design are based on factors such as the specific climatic conditions and traffic flow in the target application area, ensuring that the modifier can function stably and long-term in different environments. By introducing expressions to guide formula adjustments, it is possible to respond more scientifically to complex and changing application needs, increase the proportion of waterproof additives in rainy areas, increase the proportion of heat-resistant components in high temperature environments, and enhance wear resistance in high traffic flow areas. The adjustments are all aimed at providing the modifier solution that best suits the local environment, thereby improving the quality of road construction and maintenance.

[0120] S7. Verify the performance of the prepared modifier by using a performance test method and confirm various indicators of the modifier;

[0121] Furthermore, the modifier samples were collected after drying, sieving, mixing and granulation;

[0122] The adhesion test device was used to evaluate the adhesion of the modifier on the smooth surface of natural gravel. Specifically, the modifier was applied to the pre-prepared gravel sample and its adhesion strength was measured after immersion in water for 24 h.

[0123] The standard specimens made of the modifier were placed in a freeze-thaw cycle test chamber and subjected to a cycle from -20°C to +60°C, and the splitting strength changes of the specimens were measured.

[0124] The deformation resistance of the modifier under simulated traffic load is measured using a dynamic stability tester at a temperature of 60°C to 80°C.

[0125] The modified specimens were placed in a low temperature environment of -20°C and subjected to gradually increasing tensile stress until the specimens were destroyed;

[0126] The compressive strength tester was used to measure the bonding strength inside the modifier to ensure that it was not less than 0.3MP.

[0127] It should be noted that the performance testing method is a key step in verifying whether the prepared modifier meets the expected performance and technical standards. Through a series of rigorous tests, adhesion performance, freeze-thaw splitting ratio, high-temperature dynamic stability, low-temperature failure strain and cohesive strength, etc., the various technical indicators of the modifier can be comprehensively evaluated. The test results not only provide a scientific basis for product quality, but also provide a reliable guarantee for the practical application of the modifier, ensuring that it can maintain excellent performance under various environmental conditions.

[0128] In summary, by pretreating all raw materials with drying treatment, the purpose of removing excess moisture is achieved. By accurately controlling the drying temperature and time of different materials, the moisture content of slaked lime, synthetic resin powder and polyester fiber is ensured to be lower than 0.5%, thereby improving the overall performance of the modifier. By screening the slaked lime with screening, large particles are removed and uniform slaked lime powder is obtained. By using a high-speed mixer to fully mix the selected proportion of slaked lime, synthetic resin powder and polyester fiber, the uniform distribution of each component is achieved. By adjusting the speed and time to optimize the mixing effect, a uniformly dispersed mixture is finally obtained, which not only enhances the consistency and reliability of the modifier, but also improves its adhesion performance and long-term stability in practical applications. By using a rotary drum granulator to granulate the mixture, the mixed powder is made into particles of a certain specification, thereby achieving standardized production of modifier particles.

[0129] Example 2

[0130] Please refer to Table 1, which is the second embodiment of the present invention. This embodiment provides the preparation of a natural gravel smooth surface and asphalt interface modifier and its performance test, as follows:

[0131] In order to verify the preparation method of the natural gravel smooth surface and asphalt interface modifier provided by the present invention and its effect in practical application, a series of comparative experiments were designed and implemented. In this experiment, No. 70 grade A asphalt was used as the base material, and the amount of asphalt mixture was 0.1% to replace the mineral powder, and the adhesion test was carried out according to 2% of asphalt. The experimental objects included a control group without a modifier and four modifier groups with different proportions, namely A10%+B89%+C1%, A80%+B5%+C15%, A50%+B30%+C20%, and A10%+B40%+C50%;

[0132] First, according to the invention, high-purity slaked lime, synthetic resin powder obtained by mixing and grinding PE wax, sodium hydroxide, sodium stearate, potassium stearate, ammonium chloride, and amino silicone resin components in a specific proportion, and polyester fiber with a length of 6-18 mm are collected, and the materials are weighed and placed in a special drying container. The drying temperature is set according to the characteristics of different materials (60°C to 80°C for slaked lime, 40°C to 60°C for synthetic resin powder and polyester fiber) to ensure that the final moisture content is less than 0.5%. After drying, the slaked lime is screened using a sieve with an aperture of 0.075 mm to 0.6 mm to remove large particles to obtain evenly distributed slaked lime powder.

[0133] Subsequently, the dried and screened slaked lime, synthetic resin powder and polyester fiber are weighed according to the specified ratio and placed in a high-speed mixer. The speed of the mixer is set to 1000 to 1500 rpm and the mixing time is adjusted to 15 to 20 minutes to ensure that the components are fully contacted and evenly distributed. During this process, the temperature changes in the mixer are monitored in real time to ensure that it does not exceed 60°C. At the same time, the optimization formula is used to guide the parameter adjustment to improve the mixing efficiency.

[0134] Next, the mixed material is transferred to a rotary drum granulator, the drum diameter is set to 1 to 2 meters, and the rotation speed is controlled between 5 and 10 rpm. During the preparation process, an appropriate amount of water is added to help the powder form particles better. After the granulator is turned on, the material continues to roll and collide in the rotating drum, gradually forming particles of a certain specification. Finally, a series of rigorous performance testing methods are used to verify the various indicators of the prepared modifier, including adhesion performance, freeze-thaw splitting ratio, high-temperature dynamic stability, low-temperature failure strain and cohesive strength.

[0135] In addition, based on the historical meteorological data and road traffic flow information of the target application area, a regional characteristics analysis was conducted, the main climate characteristics and traffic load conditions were evaluated, and the specific formula of the modifier was adjusted to meet the needs under different environmental conditions. The proportion of waterproof additives was increased in rainy areas; the proportion of heat-resistant components in synthetic resins was increased in high temperature environments; and the wear resistance of the material was enhanced in high traffic flow areas.

[0136] The data table is as follows:

[0137]

[0138] Table 1 Comparison of modifier formula and performance test results

[0139] Tabular data analysis:

[0140] It can be seen from the data in the above table that the modifier provided by the present invention significantly improves various performance indicators of asphalt mixture, especially adhesion, freeze-thaw splitting ratio, high temperature performance dynamic stability, low temperature failure strain and cohesive strength. Specifically:

[0141] The adhesion level of the control group was only 2, while all modifier groups reached the highest level of 5, which shows that the modifier significantly enhanced the adhesion between the natural gravel smooth surface and the asphalt, solving the problem of weak adhesion existing in the prior art.

[0142] The freeze-thaw splitting ratio of the control group was 62.8%, far lower than the industry standard of 75%. In contrast, the freeze-thaw splitting ratio of the modifier group exceeded 90%, showing excellent anti-freeze-thaw performance, especially in extreme weather conditions, and can effectively prevent pavement cracking and peeling.

[0143] The dynamic stability of the control group was 3291 times / mm, which did not reach the industry standard of 3500 times / mm. In the modifier group, even the lowest value reached 7016 times / mm, and the highest value reached 11789 times / m, far exceeding the industry standard, showing excellent high-temperature stability and the ability to withstand long-term high-temperature loads without deformation.

[0144] The low-temperature failure strain of the control group was 2218με, which failed to reach the industry standard of 2400με. The modifier groups all exceeded 2500με, with the highest reaching 2871με, indicating that the modifier has better flexibility and anti-destruction ability in low-temperature environments, and is suitable for road construction in cold areas.

[0145] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a natural gravel smooth surface and asphalt interface modifier, characterized in that: include: Collect slaked lime, synthetic resin powder and polyester fiber as raw materials of modifier; All raw materials are pre-treated by drying to obtain dry and pure raw materials; The slaked lime is screened by sieving to remove large particles to obtain slaked lime powder; The mixture is obtained by fully mixing the slaked lime, synthetic resin powder and polyester fiber in a selected ratio using a high-speed mixer; The mixture is granulated by a rotary drum granulator, and the mixed powder is made into particles of a certain specification to obtain modifier particles; By using regional characteristic analysis to evaluate the climate conditions and traffic flow factors in the target application area, the specific formula of the modifier is adjusted according to the regional characteristics to obtain a customized modifier solution; The performance of the prepared modifier is verified by using performance testing methods, and various indicators of the modifier are confirmed.

2. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 1, characterized in that: The specific steps of collecting slaked lime, synthetic resin powder and polyester fiber as raw materials of the modifier are as follows: Use high purity slaked lime; Select synthetic resin powder which is made by mixing and grinding PE wax, sodium hydroxide, sodium stearate, potassium stearate, ammonium chloride and amino silicone resin in a specific proportion; Choose polyester fiber with a length of 6-18mm; The mixing ratio is 50% slaked lime, 30% synthetic resin and 20% polyester fiber.

3. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 2, characterized in that: The method of pre-treating all raw materials by drying to obtain dry and pure raw materials comprises the following specific steps: The collected slaked lime, synthetic resin powder and polyester fiber are placed in special drying containers respectively; Set the drying temperature according to the characteristics of different materials; For slaked lime, use low temperature drying at 60°C to 80°C; For synthetic resin powder and polyester fiber, the heating condition is set at 40℃ to 60℃; The slaked lime is dried for 24 hours, the synthetic resin powder is dried for 12 hours, and the polyester fiber is dried for 6 to 8 hours until the final moisture content is less than 0.5%.

4. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 3, characterized in that: The slaked lime is screened by sieving to remove large particles to obtain slaked lime powder, and the specific steps are: Firstly, the dried slaked lime is taken out from the drying container for screening; Choose a sieve with a pore size between 0.075 mm and 0.6 mm; Install a vibrating screen and adjust the speed and amplitude of the screen so that the material can be separated into particles of different sizes on the screen; Large particles of slaked lime that fail to pass through the screen are collected separately and further ground.

5. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 4, characterized in that: The method comprises the following steps: using a high-speed mixer to fully mix the slaked lime, synthetic resin powder and polyester fiber of a selected ratio to obtain a mixture; The dried and sieved slaked lime, synthetic resin powder and polyester fiber are weighed in a ratio of 50% slaked lime, 30% synthetic resin powder and 20% polyester fiber and placed in a feed hopper of a high-speed mixer respectively; Select a high-speed mixer, set the mixer speed to 1000 to 1500 rpm, and adjust the mixing time to 15 to 20 minutes; Turn on the high-speed mixer to make the materials rotate rapidly under strong mechanical stirring; The optimization formula is introduced to guide the parameter optimization in the mixing process, and the expression is: Where: M is the mixing efficiency index, A is the water absorption rate of slaked lime, B represents the cohesive force index of synthetic resin powder, C is the climate factor, T is the temperature during mixing, D is the durability index, E is the elastic modulus, and F is the average length of polyester fiber; During the mixing process, the temperature change in the mixer is monitored in real time to ensure that it does not exceed 60°C. At the same time, the mixing efficiency index M is used to optimize the mixing effect by adjusting the speed and time to obtain a mixture.

6. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 5, characterized in that: The method comprises the following steps: granulating the mixture by using a rotary drum granulator, making the mixed powder into particles of a certain specification, and obtaining modifier particles. Transfer the materials fully mixed by the high-speed mixer to the feed hopper of the drum granulator; Choose a drum granulator, set the drum diameter to 1 to 2 meters, and control the speed between 5 and 10 rpm; Adding water during the preparation process helps the powder to form particles better; Turn on the drum granulator to make the materials tumble and collide continuously in the rotating drum, and gradually form particles in the process.

7. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 6, characterized in that: The above-mentioned regional characteristic analysis is used to evaluate the climate conditions and traffic flow factors of the target application area, and the specific formula of the modifier is adjusted according to the regional characteristics to obtain a customized modifier solution. The specific steps are as follows: Collect historical meteorological data of the target application area, including annual average temperature, extreme temperature range, annual precipitation, and humidity changes; Obtain road traffic flow information in the area; Based on the collected meteorological data, assess the main climate characteristics of the target area; Analyzing road traffic flow data, high traffic flow sections require more wear-resistant and tougher modifier formulas; For lightly used roads, the formula can be simplified to reduce costs; Expressions are introduced during the formulation adjustment process to ensure that the modifier is suitable for the specific application environment.

8. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 7, characterized in that: The performance of the prepared modifier is verified by using a performance test method, and various indicators of the modifier are confirmed. The specific steps are: Collect modifier samples after drying, sieving, mixing and granulation; The adhesion test device was used to evaluate the adhesion of the modifier on the smooth surface of natural gravel. Specifically, the modifier was applied to the pre-prepared gravel sample and its adhesion strength was measured after immersion in water for 24 h. The standard specimen made of the modifier is placed in a freeze-thaw cycle test chamber, and the splitting strength change of the specimen is measured after a cycle from -20℃ to +60℃. The deformation resistance of the modifier under simulated traffic load is measured using a dynamic stability tester at a temperature of 60°C to 80°C. The modified specimens were placed in a low temperature environment of -20°C and subjected to gradually increasing tensile stress until the specimens were destroyed; The compressive strength tester was used to measure the bonding strength inside the modifier to ensure that it was not less than 0.3 MPa.

9. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 7, characterized in that: According to the solution index S, the proportion of each component in the modifier is adjusted as follows: Increase the proportion of waterproofing additives in rainy areas; Increase the proportion of heat-resistant components in synthetic resins under high temperature environments; Enhances material wear resistance in high traffic areas.

10. The method for preparing a natural gravel smooth surface and asphalt interface modifier according to claim 7, characterized in that: The expression introduced in the formulation adjustment process ensures that the modifier is adapted to the specific application environment. The expression is: Among them, S is the solution index; H represents the humidity factor, K represents the traffic intensity index, L is the minimum temperature, M is the material stability index, N is the natural durability, O is the optimization factor, and P is the particle size.

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