Anti-skid noise reduction asphalt concrete and preparation method thereof

Abstract

The application belongs to the technical field of asphalt concrete, and particularly relates to an anti-skid and noise-reducing asphalt concrete and a preparation method thereof. The mass ratio of the anti-skid and noise-reducing asphalt concrete comprises 10-20 parts of asphalt, 20-30 parts of anti-skid filler, 20-25 parts of fine aggregate, 25-30 parts of coarse aggregate, 30-35 parts of noise-reducing particles and 10-20 parts of mixed fibers, and a specific preparation method is provided. The application solves the defects of the existing asphalt concrete, utilizes the noise-reducing particles with porous structures to provide internal space for sound wave oscillation, so that the noise-reducing effect is achieved, and the anti-skid effect of the asphalt mixture is improved by utilizing the anti-skid particles.

Description

Technical Field

[0001] This invention belongs to the field of asphalt concrete technology, specifically relating to an anti-skid and noise-reducing asphalt concrete and its preparation method. Background Technology

[0002] With the continuous development of engineering technology, the construction system of elevated bridges has achieved rapid development, and various new technologies have been applied and developed in the construction of elevated bridges. Elevated bridges refer to bridges that cross deep valleys and canyons instead of high embankments, as well as bridges that span roads in cities, supported by high-strength towers or pillars. In my country, urban elevated bridges have become an important component of the urban transportation network. The advancement of the overall road and bridge transportation system has provided greater convenience for public travel; however, the evolution of the road and bridge transportation system has also created some negative effects, mainly manifested in traffic accidents and noise pollution.

[0003] A key factor contributing to traffic accidents on elevated bridges is the poor anti-skid properties of the bridge surface, especially in adverse weather conditions. Reports indicate that approximately 28% of traffic accidents occurring in rainy or snowy weather are caused by poor drainage and slippery bridge surfaces. In rainy or snowy weather, rainwater cannot drain quickly from ordinary dense-graded asphalt, forming a water film on the outer layer. This water film reduces the contact area between the vehicle and the asphalt, often resulting in skidding due to poor anti-skid properties, significantly increasing safety hazards. Urban elevated bridges, due to their steep terrain, severely impact driving safety in rainy or snowy weather. Therefore, drainage is crucial in the design and construction of elevated bridges, and efforts should be made to improve the anti-skid properties of the bridge surface and enhance driving conditions in extreme weather. Traffic noise is one of the major sources of pollution in modern life. While green belts for noise reduction occupy significant land, sound barriers can adversely affect the visibility of drivers, posing traffic safety hazards. Therefore, the design of anti-slip and noise-reducing bridge decks can effectively overcome the shortcomings mentioned above, and can control safety hazards during driving to a lower level.

[0004] Research and practice on anti-skid and noise-reducing asphalt pavement in my country began in the early stages of reform and opening up. Small-scale test sections were laid in Guangzhou and Shanghai, but the results were unsatisfactory. It wasn't until 2005 that my country's first drainage asphalt pavement under the hot and rainy conditions of southern China (the Yancheng-Tongzhou Expressway in Jiangsu Province) was constructed. The challenges of this section were high temperature, high humidity, and heavy loads, requiring the selection of suitable aggregates and asphalt materials. Researchers chose basalt aggregates and SBS modified asphalt. Four years of continuous monitoring of this section showed that the use of drainage asphalt concrete pavement significantly improved drainage, noise reduction, and durability compared to other types of asphalt concrete pavement. However, with the operation of elevated bridges in urban conditions, even higher requirements have been placed on the anti-skid and noise-reducing performance of the pavement. Summary of the Invention

[0005] To address the problems in the existing technology, this invention provides an anti-slip and noise-reducing asphalt concrete that solves the defects of existing asphalt concrete. It utilizes porous noise-reducing particles to provide internal space for sound wave oscillation, thereby achieving a noise reduction effect. At the same time, it uses anti-slip particles to improve the anti-slip effect of the asphalt mixture.

[0006] To achieve the above technical objectives, the technical solution of the present invention is as follows:

[0007] A type of anti-slip and noise-reducing asphalt concrete, the mass ratio of which includes: 10-20 parts asphalt, 20-30 parts anti-slip filler, 20-25 parts fine aggregate, 25-30 parts coarse aggregate, 30-35 parts noise-reducing particles, and 10-20 parts mixed fiber.

[0008] The asphalt used is one or both of the national standard No. 70 and No. 90 asphalt. This asphalt has moderate hardness and consistency, strong resistance to shear failure, and is easy to apply in construction.

[0009] The anti-slip filler is made of polypropylene resin particles or polyethylene resin particles. These anti-slip particles are homogeneously dispersed throughout the asphalt concrete, producing an excellent anti-slip effect and improving the overall anti-slip performance of the material.

[0010] The fine aggregate is a mixture of fly ash, waste tire powder, and steel slag, with a mass ratio of 3:1-2:4-5. The particle size of the fine aggregate is 0.15-1.5 mm. Fly ash, waste tire powder, and steel slag are all waste materials. Using them as fine aggregate in asphalt concrete achieves the effect of waste recycling.

[0011] The coarse aggregate is basalt with a particle size of 5-8 mm.

[0012] The noise-reducing particles are porous ceramic particles based on a silicon-oxygen-aluminum-oxygen composite system. The porous ceramic particles themselves have a porous structure, which can confine sound within the porous structure. Combined with the stability of the porous structure, this creates repeated internal oscillations, achieving the noise reduction effect. Furthermore, the preparation method of the noise-reducing particles includes the following steps: a1, adding trichloromethylsilane to diethyl ether and stirring evenly, then adding ethyl cellulose and stirring thoroughly to form a solution. The concentration of trichloromethylsilane in diethyl ether is 300-500 g / L, the stirring speed is 200-400 r / min, and the concentration of ethyl cellulose in the solution is 400-600 g / L. This step utilizes the solubility of diethyl ether in ethyl cellulose and trichloromethylsilane to form a homogeneous mixture; a2, The solution is sealed and pressurized to form a viscous slurry, which is then granulated and dried to obtain mixed particles. The sealing and pressurization process is carried out at 30-35℃, and the granulation and drying temperature is 40-50℃. This step utilizes the sealing and pressurization method to extract pressure from the sealed cavity containing the solution, which improves the volatility of diethyl ether. This temperature environment does not affect solute formation, achieving a good concentration effect. During granulation and drying, the viscous slurry is converted into mixed particles of ethyl cellulose and methyltrichlorosilane. Next, the surface of the mixed particles is sprayed with aqueous ethanol and allowed to stand for 20-30 minutes, then dried to obtain hydrolyzed mixed particles. The volume ratio of ethanol to water in the aqueous ethanol is 100:2-3, and the spraying rate is 0.2-0.5 mL / cm³. 2 The settling temperature is 20-30℃, the atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 15-20:1. The drying temperature is 80-90℃. This step utilizes the spraying of aqueous ethanol and the permeability of ethyl cellulose to ethanol to ensure that water molecules penetrate inward with the ethanol, achieving contact and hydrolysis reaction between trichloromethylsilane and water molecules to obtain trihydroxymethylsilane. The settling process is then carried out in a water-containing atmosphere. The absorption of water molecules from the air by ethanol replenishes the consumed water molecules, thereby promoting the filling of trichloromethylsilane. The mixture undergoes hydrolysis followed by in-situ polycondensation of trihydroxymethyl groups during drying, resulting in hydrolyzed mixed particles with a silicon-oxygen framework and ethyl cellulose as a barrier. Alternatively, methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose are added to diethyl ether and stirred thoroughly to form a mixed solution. This solution is then sprayed onto the surface of the hydrolyzed mixed particles and dried to obtain coated mixed particles. The mass ratio of methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose is 2-3:3-4:1, and the concentration of ethyl cellulose in the diethyl ether is 100-120 g / L, with a spraying rate of 1-2 mL / cm³. 2The drying temperature is 50-60℃; the drying atmosphere is a mixture of nitrogen and water vapor, with a nitrogen to water vapor volume ratio of 10-15:1. This step utilizes the solubility of methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose in diethyl ether to form a homogeneous mixture, which is then sprayed onto the surface of the hydrolyzed mixed particles to form a surface wet film. The solvent of the wet film is diethyl ether, which is soluble in the ethyl cellulose within the mixed particles. Therefore, the surface wet film and the mixed particles form an integrated structure. During the drying process, the surface wet film comes into contact with water molecules in the atmosphere, at which point aluminum isopropoxide and trichloromethylsilane undergo in-situ hydrolysis; a5, the hydrolyzed mixed particles are placed in a reaction vessel. After being kept at a constant temperature for 1-2 hours and cooled to room temperature, ethanol was added and ultrasonically treated for 20-30 minutes. The mixture was then filtered to obtain pre-formed particles. The constant temperature setting was 200-220℃, and the amount of ethanol added was 5-8 times the mass of the hydrolyzed mixed particles. The ultrasonic treatment was performed at a frequency of 80-100 kHz and a temperature of 20-30℃. This step utilizes constant temperature setting to ensure that the aluminum hydroxide and trihydroxymethylsilane obtained from in-situ hydrolysis undergo in-situ condensation polymerization. This hydroxyl condensation polymerization forms a porous structure within the coating layer, and due to the different ethyl cellulose content, the pore size of the coating layer is smaller than that of the mixed particles. During the constant temperature setting process... Ethyl cellulose maintains its stability, with a melting point above 240℃. This means that under constant temperature and stillness, ethyl cellulose remains solid, acting as a barrier and reducing internal flow, thus ensuring the formation of the silicon-oxygen-aluminum-oxygen framework structure. During ultrasonic treatment in an ethanol environment, ethyl cellulose dissolves completely in ethanol with ultrasonic vibration, thus fully exposing the porous structure of the pre-formed particles, and the surface pore size is smaller than the internal pore size. A6, the pre-formed particles are placed in the middle section of the reactor, and aluminum isopropoxide vapor is introduced at a constant temperature. After hot filtration, coated pre-formed particles are obtained. The coated pre-formed particles are then allowed to stand for 2-4 hours before calcination. Noise-reducing particles are obtained after sintering. The reactor is purged with nitrogen before use to ensure that the reactor is in a nitrogen atmosphere. The constant temperature of the gas is 140-150℃. The aluminum isopropoxide vapor is a mixture of aluminum isopropoxide gas and nitrogen, and the volume ratio of aluminum isopropoxide gas to nitrogen is 1:5-7. The gas is introduced at a rate of 5-10 mL / min and for 5-10 min. The temperature of the hot filtration is 120-130℃. The static atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 14-18:1. The temperature is 20-30℃. The sintering temperature is 250-270℃.This step utilizes nitrogen purging to completely remove water molecules and impurity gases from the reactor, and then introduces aluminum isopropoxide vapor. Taking advantage of the gas's permeability, the aluminum isopropoxide molecules completely penetrate the mixed particles. During the heat treatment, the aluminum isopropoxide transforms into a liquid and adheres to the specific surface area inside the pre-formed particles. The surface liquid-phase deposited aluminum isopropoxide exhibits a certain fluidity, reducing the pore size on the surface of the pre-formed particles. With subsequent settling and sintering, the aluminum isopropoxide undergoes in-situ hydrolysis and condensation, forming an alumina film on the specific surface area of ​​the pre-formed particles. The noise-reducing particles prepared by this process have a porous structure with different internal and external particle sizes, and the internal particle size is larger than the external surface particle size. During use, the external surface particle size of the noise-reducing particles provides excellent barrier properties, preventing dust from entering without blocking sound waves. When sound waves enter the noise-reducing particles, the pore size of the outer layer ensures the existence of a porous structure, while the pore size inside the particles is larger than that on the outer layer. This means the internal structure of the noise-reducing particles is more complex than the surface structure, which helps to reduce and eliminate sound waves, thus achieving stable noise reduction. Simultaneously, the heat generated by sound wave elimination is rapidly transferred through the alumina, solving the problem of localized temperature differences. In rainy weather, moisture passes through the noise-reducing particles and is adsorbed by the alumina. At this time, the sound waves not only involve vibrations in the air system but also require liquid-phase transfer at the liquid film, resulting in even better noise reduction.

[0013] The hybrid fiber is composed of sodium polyacrylate fiber and sepiolite fiber, with a mass ratio of sodium polyacrylate fiber to sepiolite fiber of 5:1-2. Sodium polyacrylate fiber itself has good water absorption and can expand after absorbing water, forming a liquid film on the surface. This liquid film structure can play a certain filtering role, preventing surface dust from entering. At the same time, the liquid film generated by the expansion of sodium polyacrylate fiber plays a certain role in noise reduction. When noise is transmitted in asphalt concrete, the transmission and conversion between solid, liquid and gaseous states will bring a lot of energy loss. The formation of the liquid film is the expansion of the liquid film in the system, that is, the formation of a liquid phase membrane in the original sound wave transmission system, which brings the transmission of the liquid phase system and is beneficial to the noise reduction effect. Sepiolite softens when it comes into contact with water. This softening structure ensures that it can bend, thereby compressing its original pore space and providing space for the expansion of sodium polyacrylate. At the same time, the softening liquid of sepiolite also creates certain spatial gaps. This gap structure can meet the flow of water, thus achieving excellent drainage effect. In an anhydrous environment, sodium polyacrylate has a stable structure and a certain degree of adhesion. Its molecular chains are tightly packed and do not have particle permeability, effectively preventing the entry of dust and other impurities. The fibrous structure of sepiolite is essentially a porous fibrous structure with abundant and fine internal pores, eliminating concerns about dust penetration and clogging. Furthermore, the porous structure of sepiolite is based on a large number of tiny pores, which are complex and can provide multi-angle reflection vibrations for sound waves, thus aiding in noise reduction.The preparation method of the mixed fiber includes the following steps: b1, adding sepiolite fibers to water and ultrasonically dispersing them to form a homogeneous suspension, wherein the concentration of sepiolite in water is 1000-2000 g / L, the ultrasonic dispersion temperature is 20-30℃, and the ultrasonic frequency is 80-90 kHz. This step utilizes the softening property of sepiolite in water, combined with the high-frequency vibration of ultrasound, to ensure that the sepiolite is homogeneously dispersed in the liquid to form a homogeneous suspension; b2, adding sodium polyacrylate fibers to the homogeneous suspension and ultrasonically dispersing them for 2-4 hours to obtain a homogeneous mixed suspension; wherein the mass ratio of sodium polyacrylate fibers to sepiolite fibers is 5:1-2, the ultrasonic dispersion frequency is 70-90 kHz, and the temperature is 20-30℃. This step utilizes the water absorption and swelling property of sodium polyacrylate, and the sepiolite fibers themselves are saturated in water. The softening properties of sepiolite fibers, when treated with ultrasound, allow them to vibrate at high frequencies and penetrate into the water-absorbing and swelled sodium polyacrylate fibers, thus achieving mutual mixing of sodium polyacrylate and sepiolite fibers. Based on the homogenization effect brought about by ultrasonic vibration, the sepiolite fibers achieve homogeneous mixing within the sodium polyacrylate fibers. b3, the mixed suspension is placed in a reaction vessel and vacuum-dried to obtain mixed fibers. The reaction vessel is in a nitrogen atmosphere, and the vacuum drying temperature is 70-80℃. This step utilizes vacuum to convert internal water molecules into water vapor, achieving a drying effect. This treatment method avoids the flow displacement of sodium polyacrylate and sepiolite during the drying process, and this vacuum drying is an in-situ drying process, meaning that the structural positions of sodium polyacrylate and sepiolite remain unchanged, maintaining a homogeneous mixed state. The composite fibers in this homogeneous mixed state can utilize the differences in structural and spatial changes between sepiolite fibers and sodium polyacrylate in dry and wet environments to form their own compensatory structure.

[0014] The preparation method of the anti-skid and noise-reducing asphalt concrete includes the following steps:

[0015] Step 1: The anti-slip filler, fine aggregate and coarse aggregate are mixed at high speed to form a mixture. The high-speed mixing speed is 400-800 r / min and the temperature is room temperature.

[0016] Step 2: Heat the asphalt to 170-180℃ and stir until homogeneous to obtain preheated asphalt. The stirring speed is 300-500 r / min.

[0017] Step 3: Add the mixture to the preheated asphalt and stir at a constant temperature for 1-3 hours. Then add the noise-reducing particles and mixed fibers in sequence, and stir evenly to obtain anti-skid and noise-reducing asphalt particles. The stirring speed of the constant temperature stirring is 200-500 r / min, and the temperature is 180-190℃.

[0018] As can be seen from the above description, the present invention has the following advantages:

[0019] 1. This invention solves the defects of existing asphalt concrete by using porous noise-reducing particles to provide internal space for sound wave oscillation, thereby achieving a noise reduction effect. At the same time, anti-slip particles are used to improve the anti-slip effect of asphalt mixture.

[0020] 2. This invention uses a porous structure with inconsistent inner and outer pore sizes as noise-reducing particles, which not only prevents dust and blockage, but also ensures that sound waves repeatedly oscillate and dissipate within the porous structure, resulting in excellent noise reduction.

[0021] 3. This invention utilizes sepiolite fiber and sodium polyacrylate fiber to form a mixed fiber that permeates each other, which not only provides sufficient space to achieve drainage, but also uses their complementary space to achieve noise reduction. Detailed Implementation

[0022] The present invention will be described in detail with reference to the embodiments, but the claims of the present invention are not intended to limit the scope of the invention.

[0023] Example 1: An anti-slip and noise-reducing asphalt concrete, the mass ratio of which includes: 10 parts asphalt, 20 parts anti-slip filler, 20 parts fine aggregate, 25 parts coarse aggregate, 30 parts noise-reducing particles, and 10 parts mixed fiber.

[0024] The asphalt used is national standard No. 70 asphalt.

[0025] The anti-slip filler is made of polypropylene resin particles.

[0026] The fine aggregate is a mixture of fly ash, waste tire powder and steel slag, and the mass ratio of fly ash, waste tire powder and steel slag is 3:1:4. The particle size of the fine aggregate is 0.15mm.

[0027] The coarse aggregate is basalt with a particle size of 5 mm.

[0028] The noise-reducing particles are porous ceramsite with a silicon-oxygen-aluminum-oxygen composite system. The preparation method of the noise-reducing particles includes the following steps: a1, adding trichloromethylsilane to diethyl ether and stirring evenly, then adding ethyl cellulose and stirring thoroughly to form a solution. The concentration of trichloromethylsilane in diethyl ether is 300 g / L, the stirring speed is 200 r / min, and the concentration of ethyl cellulose in the solution is 400 g / L; a2, sealing and pressurizing the solution to form a viscous slurry, then granulating and drying to obtain mixed particles. The sealing and pressurizing treatment is carried out at 30℃, and the granulation and drying temperature is 40℃; a3, spraying the surface of the mixed particles with aqueous ethanol, allowing it to stand for 20 min, and then drying to obtain hydrolyzed mixed particles. The volume ratio of ethanol to water in the aqueous ethanol is 100:2, and the spraying volume is 0.2 mL / cm³. 2The settling temperature is 20°C, the atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 15:1; the drying temperature is 80°C; a4, methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose are added to diethyl ether and stirred thoroughly to form a mixed solution, then the mixed solution is sprayed onto the surface of the hydrolyzed mixed particles, and dried to obtain coated mixed particles. The mass ratio of methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose is 2:3:1, and the concentration of ethyl cellulose in diethyl ether is 100 g / L, and the spraying rate is 1 mL / cm. 2 The drying temperature is 50℃; a5, the hydrolyzed mixed particles are placed in a reactor and kept at a constant temperature for 1 hour. After cooling to room temperature, ethanol is added and ultrasonically treated for 20 minutes. After filtration, pre-formed particles are obtained. The constant temperature is 200℃, the amount of ethanol added is 5 times the mass of the hydrolyzed mixed particles, the ultrasonic frequency of the ultrasonic treatment is 80kHz, and the temperature is 20℃; a6, the pre-formed particles are placed in the middle section of the reactor and aluminum isopropoxide vapor is introduced at a constant temperature. After hot filtration, coated pre-formed particles are obtained. Then, the coated pre-formed particles are kept at a constant temperature for 2 hours and sintered to obtain... To produce noise-reducing particles, the reactor is purged with nitrogen before use to ensure a nitrogen atmosphere. The constant temperature inlet temperature is 140°C. The aluminum isopropoxide vapor is a mixture of aluminum isopropoxide gas and nitrogen, with a volume ratio of 1:5. The inlet rate is 5 mL / min, and the inlet time is 5 min. The hot filtration temperature is 120°C. The static atmosphere is a mixture of nitrogen and water vapor, with a volume ratio of 14:1 and a temperature of 20°C. The sintering temperature is 250°C.

[0029] The mixed fiber is composed of sodium polyacrylate fiber and sepiolite fiber, and the mass ratio of sodium polyacrylate fiber to sepiolite fiber in the mixed fiber is 5:1. The preparation method of the mixed fiber includes the following steps: b1, adding sepiolite fiber to water and ultrasonically dispersing it to form a homogeneous suspension, wherein the concentration of sepiolite in water is 1000 g / L, the ultrasonic dispersion temperature is 20℃, and the ultrasonic frequency is 80 kHz; b2, adding sodium polyacrylate fiber to the homogeneous suspension and ultrasonically dispersing it for 2 h to obtain a homogeneous mixed suspension, wherein the mass ratio of sodium polyacrylate fiber to sepiolite fiber is 5:1, the ultrasonic dispersion frequency is 70 kHz, and the temperature is 20℃; b3, placing the mixed suspension in a reaction vessel and vacuum drying it to obtain the mixed fiber, wherein the atmosphere inside the reaction vessel is a nitrogen atmosphere, and the vacuum drying temperature is 70℃.

[0030] The preparation method of the anti-skid and noise-reducing asphalt concrete includes the following steps:

[0031] Step 1: The anti-slip filler, fine aggregate and coarse aggregate are mixed at high speed to form a mixture. The high-speed mixing speed is 400 r / min and the temperature is room temperature.

[0032] Step 2: Heat the asphalt to 170°C and stir until homogeneous to obtain preheated asphalt. The stirring speed is 300 r / min.

[0033] Step 3: Add the mixture to the preheated asphalt and stir at a constant temperature for 1 hour. Then, add the noise-reducing particles and mixed fibers in sequence, and stir evenly to obtain anti-skid and noise-reducing asphalt particles. The stirring speed of the constant temperature stirring is 200 r / min and the temperature is 180℃.

[0034] Example 2: A type of anti-slip and noise-reducing asphalt concrete, the mass ratio of which includes: 20 parts asphalt, 30 parts anti-slip filler, 25 parts fine aggregate, 30 parts coarse aggregate, 35 parts noise-reducing particles, and 20 parts mixed fiber.

[0035] The asphalt used is national standard No. 90 asphalt.

[0036] The anti-slip filler is made of polyethylene resin particles.

[0037] The fine aggregate is a mixture of fly ash, waste tire powder and steel slag, and the mass ratio of fly ash, waste tire powder and steel slag is 3:2:5. The particle size of the fine aggregate is 1.5mm.

[0038] The coarse aggregate is basalt with a particle size of 8 mm.

[0039] The noise-reducing particles are porous ceramsite with a silicon-oxygen-aluminum-oxygen composite system. The preparation method of the noise-reducing particles includes the following steps: a1, adding trichloromethylsilane to diethyl ether and stirring evenly, then adding ethyl cellulose and stirring thoroughly to form a solution. The concentration of trichloromethylsilane in diethyl ether is 500 g / L, the stirring speed is 400 r / min, and the concentration of ethyl cellulose in the solution is 600 g / L; a2, sealing and pressurizing the solution to form a viscous slurry, then granulating and drying to obtain mixed particles. The sealing and pressurizing treatment is carried out at 35°C, and the granulation and drying temperature is 50°C; a3, spraying the surface of the mixed particles with aqueous ethanol, allowing it to stand for 30 min, and then drying to obtain hydrolyzed mixed particles. The volume ratio of ethanol to water in the aqueous ethanol is 100:3, and the spraying volume is 0.5 mL / cm. 2The settling temperature is 30°C, the atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 20:1. The drying temperature is 90°C. A4, methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose are added to diethyl ether and stirred thoroughly to form a mixed solution. The mixed solution is then sprayed onto the surface of the hydrolyzed mixed particles and dried to obtain coated mixed particles. The mass ratio of methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose is 3:4:1, and the concentration of ethyl cellulose in diethyl ether is 120 g / L. The spraying rate is 2 mL / cm³. 2 The drying temperature is 60℃; a5, the hydrolyzed mixed particles are placed in a reactor and kept at a constant temperature for 2 hours. After cooling to room temperature, ethanol is added and ultrasonically treated for 30 minutes. After filtration, pre-formed particles are obtained. The constant temperature is 220℃, the amount of ethanol added is 8 times the mass of the hydrolyzed mixed particles, the ultrasonic frequency of the ultrasonic treatment is 100kHz, and the temperature is 30℃; a6, the pre-formed particles are placed in the middle section of the reactor and aluminum isopropoxide vapor is introduced at a constant temperature. After hot filtration, coated pre-formed particles are obtained. Then, the coated pre-formed particles are kept at a constant temperature for 4 hours and sintered to obtain... The noise-reducing particles are prepared by purging the reactor with nitrogen before use to ensure a nitrogen atmosphere. The constant temperature of the gas is 150°C. The aluminum isopropoxide vapor is a mixture of aluminum isopropoxide gas and nitrogen with a volume ratio of 1:7. The gas is introduced at a rate of 10 mL / min for 10 min. The hot filtration temperature is 130°C. The static atmosphere is a mixture of nitrogen and water vapor with a volume ratio of 18:1 and a temperature of 30°C. The sintering temperature is 270°C.

[0040] The mixed fiber is composed of sodium polyacrylate fiber and sepiolite fiber, and the mass ratio of sodium polyacrylate fiber to sepiolite fiber in the mixed fiber is 5:2. The preparation method of the mixed fiber includes the following steps: b1, adding sepiolite fiber to water and ultrasonically dispersing it to form a homogeneous suspension, wherein the concentration of sepiolite in water is 2000 g / L, the ultrasonic dispersion temperature is 30℃, and the ultrasonic frequency is 90 kHz; b2, adding sodium polyacrylate fiber to the homogeneous suspension and ultrasonically dispersing it for 4 h to obtain a homogeneous mixed suspension, wherein the mass ratio of sodium polyacrylate fiber to sepiolite fiber is 5:2, the ultrasonic dispersion frequency is 90 kHz, and the temperature is 30℃; b3, placing the mixed suspension in a reaction vessel and vacuum drying it to obtain the mixed fiber, wherein the atmosphere inside the reaction vessel is a nitrogen atmosphere, and the vacuum drying temperature is 80℃.

[0041] The preparation method of the anti-skid and noise-reducing asphalt concrete includes the following steps:

[0042] Step 1: The anti-slip filler, fine aggregate and coarse aggregate are mixed at high speed to form a mixture. The high-speed mixing speed is 800 r / min and the temperature is room temperature.

[0043] Step 2: Heat the asphalt to 180°C and stir until homogeneous to obtain preheated asphalt. The stirring speed is 500 r / min.

[0044] Step 3: Add the mixture to the preheated asphalt and stir at a constant temperature for 3 hours. Then, add the noise-reducing particles and mixed fibers in sequence and stir evenly to obtain anti-skid and noise-reducing asphalt particles. The stirring speed of the constant temperature stirring is 500 r / min and the temperature is 190℃.

[0045] Example 3: An anti-slip and noise-reducing asphalt concrete, the mass ratio of which includes: 15 parts asphalt, 25 parts anti-slip filler, 22 parts fine aggregate, 28 parts coarse aggregate, 33 parts noise-reducing particles, and 15 parts mixed fiber.

[0046] The asphalt used is national standard No. 70 asphalt and No. 90 asphalt, with a mass ratio of 1:1.

[0047] The anti-slip filler is made of polyethylene resin particles.

[0048] The fine aggregate is a mixture of fly ash, waste tire powder and steel slag, and the mass ratio of fly ash, waste tire powder and steel slag is 3:1:5. The particle size of the fine aggregate is 1.2mm.

[0049] The coarse aggregate is basalt with a particle size of 6 mm.

[0050] The noise-reducing particles are porous ceramsite with a silicon-oxygen-aluminum-oxygen composite system. The preparation method of the noise-reducing particles includes the following steps: a1, adding trichloromethylsilane to diethyl ether and stirring evenly, then adding ethyl cellulose and stirring thoroughly to form a solution. The concentration of trichloromethylsilane in diethyl ether is 400 g / L, the stirring speed is 300 r / min, and the concentration of ethyl cellulose in the solution is 500 g / L; a2, sealing and pressurizing the solution to form a viscous slurry, then granulating and drying to obtain mixed particles. The sealing and pressurizing treatment is carried out at 35°C, and the granulation and drying temperature is 45°C; a3, spraying the surface of the mixed particles with aqueous ethanol, allowing it to stand for 25 min, and then drying to obtain hydrolyzed mixed particles. The volume ratio of ethanol to water in the aqueous ethanol is 100:3, and the spraying volume is 0.4 mL / cm³. 2The settling temperature is 25°C, the atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 18:1. The drying temperature is 85°C. A4, methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose are added to diethyl ether and stirred thoroughly to form a mixed solution. The mixed solution is then sprayed onto the surface of the hydrolyzed mixed particles and dried to obtain coated mixed particles. The mass ratio of methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose is 3:4:1, and the concentration of ethyl cellulose in the diethyl ether is 110 g / L. The spraying rate is 2 mL / cm³. 2 The drying temperature is 55℃; a5, the hydrolyzed mixed particles are placed in a reactor and kept at a constant temperature for 2 hours. After cooling to room temperature, ethanol is added and ultrasonically treated for 25 minutes. After filtration, pre-formed particles are obtained. The constant temperature standing temperature is 210℃, the amount of ethanol added is 7 times the mass of the hydrolyzed mixed particles, the ultrasonic frequency of the ultrasonic treatment is 90kHz, and the temperature is 25℃; a6, the pre-formed particles are placed in the middle section of the reactor and aluminum isopropoxide vapor is introduced at a constant temperature. After hot filtration, coated pre-formed particles are obtained. Then, the coated pre-formed particles are kept at a constant temperature for 3 hours and sintered to obtain... To produce noise-reducing particles, the reactor is purged with nitrogen before use to ensure a nitrogen atmosphere. The constant temperature inlet is 145°C. The aluminum isopropoxide vapor is a mixture of aluminum isopropoxide gas and nitrogen, with a volume ratio of 1:6. The inlet rate is 8 mL / min, and the inlet time is 8 min. The hot filtration temperature is 125°C. The static atmosphere is a mixture of nitrogen and water vapor, with a volume ratio of 16:1 and a temperature of 25°C. The sintering temperature is 260°C.

[0051] The mixed fiber is composed of sodium polyacrylate fiber and sepiolite fiber, and the mass ratio of sodium polyacrylate fiber to sepiolite fiber in the mixed fiber is 5:2. The preparation method of the mixed fiber includes the following steps: b1, adding sepiolite fiber to water and ultrasonically dispersing it to form a homogeneous suspension, wherein the concentration of sepiolite in water is 1500 g / L, the ultrasonic dispersion temperature is 25℃, and the ultrasonic frequency is 85 kHz; b2, adding sodium polyacrylate fiber to the homogeneous suspension and ultrasonically dispersing it for 3 hours to obtain a homogeneous mixed suspension, wherein the mass ratio of sodium polyacrylate fiber to sepiolite fiber is 5:1, the ultrasonic dispersion frequency is 80 kHz, and the temperature is 25℃; b3, placing the mixed suspension in a reaction vessel and vacuum drying it to obtain the mixed fiber, wherein the atmosphere inside the reaction vessel is a nitrogen atmosphere, and the vacuum drying temperature is 75℃.

[0052] The preparation method of the anti-skid and noise-reducing asphalt concrete includes the following steps:

[0053] Step 1: The anti-slip filler, fine aggregate and coarse aggregate are mixed at high speed to form a mixture. The high-speed mixing speed is 600 r / min and the temperature is room temperature.

[0054] Step 2: Heat the asphalt to 175°C and stir until homogeneous to obtain preheated asphalt. The stirring speed is 400 r / min.

[0055] Step 3: Add the mixture to the preheated asphalt and stir at a constant temperature for 1-3 hours. Then add the noise-reducing particles and mixed fibers in sequence, and stir evenly to obtain anti-skid and noise-reducing asphalt particles. The stirring speed of the constant temperature stirring is 400 r / min and the temperature is 185℃.

[0056] The comparative study used commercially available asphalt concrete, specifically a product from a well-known brand in Sichuan.

[0057] The comparative data of the asphalt concrete in Examples 1-3 and the comparative example are as follows:

[0058]

[0059] The test standards for water immersion residual stability and splitting strength ratio are JTJ 0709-2011.

[0060] The anti-slip performance was evaluated using a pendulum meter; the higher the BPN, the better the anti-slip performance.

[0061] It is understood that the above detailed description of the present invention is for illustrative purposes only and is not intended to limit the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effects; as long as the usage requirements are met, they are all within the protection scope of the present invention.

Claims

1. A type of anti-slip and noise-reducing asphalt concrete, characterized in that: Its mass ratio includes: 10-20 parts asphalt, 20-30 parts anti-skid filler, 20-25 parts fine aggregate, 25-30 parts coarse aggregate, 30-35 parts noise-reducing particles, and 10-20 parts mixed fiber; The mixed fiber is made of sodium polyacrylate fiber and sepiolite fiber, and the mass ratio of sodium polyacrylate fiber to sepiolite fiber in the mixed fiber is 5:1-2; the sepiolite fiber is homogeneously mixed in the sodium polyacrylate fiber. The method for preparing the mixed fiber includes the following steps: b1, adding sepiolite fiber to water and ultrasonically dispersing it to form a homogeneous suspension, wherein the concentration of sepiolite in water is 1000-2000 g / L, the ultrasonic dispersion temperature is 20-30℃, and the ultrasonic frequency is 80-90 kHz; b2, adding sodium polyacrylate fiber to the homogeneous suspension and ultrasonically dispersing it for 2-4 hours to obtain a homogeneous mixed suspension; wherein the mass ratio of sodium polyacrylate fiber to sepiolite fiber is 5:1-2, the ultrasonic dispersion frequency is 70-90 kHz, and the temperature is 20-30℃; b3, placing the mixed suspension in a reaction vessel and vacuum drying it to obtain the mixed fiber, wherein the atmosphere inside the reaction vessel is a nitrogen atmosphere, and the vacuum drying temperature is 70-80℃; The noise-reducing particles are porous ceramic particles with a silicon-oxygen-aluminum-oxygen composite system. The porous ceramic particles have alumina as the exposed surface inside and out. The preparation method of the noise-reducing particles includes the following steps: a1. Trichloromethylsilane is added to diethyl ether and stirred until homogeneous. Then, ethyl cellulose is added and stirred thoroughly to form a solution. The concentration of trichloromethylsilane in diethyl ether is 300-500 g / L, the stirring speed is 200-400 r / min, and the concentration of ethyl cellulose in the solution is 400-600 g / L. a2, the solution is sealed and pressurized to form a viscous slurry, which is then granulated and dried to obtain mixed granules; the sealing and pressing process is carried out at 30-35℃, and the granulation and drying temperature is 40-50℃. a3. Spray the surface of the mixed particles with aqueous ethanol, let it stand for 20-30 minutes, and then dry to obtain hydrolyzed mixed particles. The volume ratio of ethanol to water in the aqueous ethanol is 100:2-3, and the spraying rate is 0.2-0.5 mL / cm³. 2 The temperature of the static treatment is 20-30℃, the atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 15-20:

1. The drying temperature is 80-90℃. a4. Methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose are added to diethyl ether and stirred thoroughly to form a mixed solution. The mixed solution is then sprayed onto the surface of the hydrolyzed mixed particles and dried to obtain coated mixed particles. The mass ratio of methyltrichlorosilane, aluminum isopropoxide, and ethyl cellulose is 2-3:3-4:1, and the concentration of ethyl cellulose in the diethyl ether is 100-120 g / L. The spraying rate is 1-2 mL / cm². 2 The drying temperature is 50-60℃; the drying atmosphere is a mixture of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10-15:

1. a5. Place the coated mixed particles into a reaction vessel and let it stand at a constant temperature for 1-2 hours. After cooling to room temperature, add ethanol and sonicate for 20-30 minutes. After filtration, the pre-made particles are obtained. The constant temperature standing temperature is 200-220℃. The amount of ethanol added is 5-8 times the mass of the coated mixed particles. The ultrasonic frequency of the ultrasonic treatment is 80-100kHz and the temperature is 20-30℃. a6. The pre-formed particles are placed in the middle section of the reactor and aluminum isopropoxide vapor is introduced at a constant temperature. After hot filtration, coated pre-formed particles are obtained. The coated pre-formed particles are then allowed to stand for 2-4 hours and sintered to obtain noise-reducing particles. The reactor is purged with nitrogen before use to ensure a nitrogen atmosphere. The constant temperature of the gas is 140-150℃. The aluminum isopropoxide vapor is a mixture of aluminum isopropoxide gas and nitrogen, with a volume ratio of 1:5-7. The introduction rate is 5-10 mL / min, and the introduction time is 5-10 min. The hot filtration temperature is 120-130℃. The standing atmosphere is a mixture of nitrogen and water vapor, with a volume ratio of 14-18:1 and a temperature of 20-30℃. The sintering temperature is 250-270℃.

2. The anti-slip and noise-reducing asphalt concrete according to claim 1, characterized in that: The asphalt used is one or both of the national standard No. 70 asphalt and No. 90 asphalt.

3. The anti-slip and noise-reducing asphalt concrete according to claim 1, characterized in that: The anti-slip filler is made of polypropylene resin particles or polyethylene resin particles.

4. The anti-slip and noise-reducing asphalt concrete according to claim 1, characterized in that: The fine aggregate is a mixture of fly ash, waste tire powder and steel slag, and the mass ratio of fly ash, waste tire powder and steel slag is 3:1-2:4-5.

5. The anti-slip and noise-reducing asphalt concrete according to claim 1, characterized in that: The fine aggregate has a particle size of 0.15-1.5 mm.

6. The anti-slip and noise-reducing asphalt concrete according to claim 1, characterized in that: The coarse aggregate is basalt with a particle size of 5-8 mm.

7. The anti-slip and noise-reducing asphalt concrete according to claim 1, characterized in that: The preparation method of the anti-skid and noise-reducing asphalt concrete includes the following steps: Step 1: The anti-slip filler, fine aggregate and coarse aggregate are mixed at high speed to form a mixture. The high-speed mixing speed is 400-800 r / min and the temperature is room temperature. Step 2: Heat the asphalt to 170-180℃ and stir until homogeneous to obtain preheated asphalt. The stirring speed is 300-500 r / min. Step 3: Add the mixture to the preheated asphalt and stir at a constant temperature for 1-3 hours. Then add the noise-reducing particles and mixed fibers in sequence, and stir evenly to obtain anti-skid and noise-reducing asphalt particles. The stirring speed of the constant temperature stirring is 200-500 r / min, and the temperature is 180-190℃.

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