Noise-reduction anti-skid asphalt composition and preparation method thereof

Abstract

The invention discloses a noise-reducing anti-skid asphalt composition and a preparation method thereof, and relates to the field of material science and engineering. The granite is used as fine aggregate, the surface of the granite is modified, the granite shows macroscopic textures through high temperature, skid resistance is achieved, meanwhile, mineral gradually exposes hydroxyl groups, the hydroxyl groups and sulfonated substances form sulfonic acid groups, and then the mineral is coated with a rubber material, so that the anti-skid performance of the granite is improved. A polar group in the rubber material reacts with a sulfonic acid group on the surface of aggregate, so that the long-term effect of a matrix is enhanced, then the rubber is subjected to foaming treatment, the noise reduction and antiskid performance is greatly improved, a rigid material and a carbon nano tube in the rubber material can be embedded into a pore structure on the surface of granite, the noise reduction and antiskid performance is further enhanced, and the service life of the rubber material is prolonged. Finally, the porous volcanic rock particles and the foamed rubber structure are utilized to form air hole channels, and the noise reduction and drainage performance is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of materials science and engineering, and specifically to a noise-reducing and anti-slip asphalt composition and a preparation method thereof. Background Art

[0002] In recent years, with the increase in the per capita ownership of transportation tools and the modern development of urban road systems, the rapid development of road traffic facilities has not only brought great convenience to people, but also brought a series of negative impacts. It is mainly reflected in the following two aspects: (1) Road surface problems, especially the continuous increase in traffic accidents caused by insufficient anti-slip performance; (2) Traffic noise accounts for up to 85% of the urban noise pollution sources, seriously affecting people's physical and mental health. Noise pollution has gradually become an environmental pollution problem that urgently needs to be solved. According to the analysis of the statistical data of more than 30,000 accidents on 7 expressways in China, the accident incidence rate on rainy days is about 5 times that on sunny days, and the traffic safety problem is particularly obvious in rainy areas. This is because when it rains and after the rain, the accumulated water on the ordinary dense-graded asphalt pavement cannot be drained in time, forming a water film on the road surface. When the vehicle is driving, it is easy to hydroplane, and spray and splashing occur, resulting in reduced visibility of the following vehicles, seriously affecting driving safety.

[0003] China has a vast territory and significant climate differences between the north and the south. Especially in the southern region, the temperature is high all year round, the sunshine lasts long, and the rainfall is abundant. Rainwater is the main factor causing road surface damage, and the good drainage performance makes the anti-slip and noise-reducing asphalt pavement have broad development prospects in rainy areas. However, compared with the traditional dense-graded asphalt pavement, the large-void asphalt pavement is more easily affected by external factors such as air, sunlight and water. That is to say, the large-void asphalt pavement is more likely to age, loosen and peel off, and has problems such as insufficient durability. Therefore, it is particularly necessary to prepare an asphalt composition with persistent noise reduction and anti-slip functions for road surfaces. Summary of the Invention

[0004] The purpose of the present invention is to provide a noise-reducing and anti-slip asphalt composition and a preparation method thereof to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A preparation method of a noise-reducing and anti-slip asphalt composition, comprising the following steps:

[0006] (1) Mix chlorosulfonic acid and tetrahydrofuran to obtain a solution, and vaporize it into a gas;

[0007] (2) Under nitrogen protection, granite particles with a particle size of 0.2 - 1 mm are heated to 300 - 500 °C at a rate of 1 - 5 °C / min, held for 0.5 - 2 h, then the gas described in step (1) is introduced until the percentage of nitrogen in the total volume is 30%, and under the condition of a confining pressure of 10 - 20 MPa, treated for 30 min to obtain modified granite particles;

[0008] (3) The rubber material and the modified granite particles are mixed and kneaded, extruded and granulated, then supercritical foaming treatment is carried out, and finally compounded with volcanic rock particles with a particle size of 0.5 - 2 mm to obtain fine aggregates;

[0009] (4) Mix 90# matrix asphalt and antioxidant 168, heat to 170 - 190 °C, stir at 60 - 200 rpm for 4 - 8 h, add Portland cement, fine aggregates, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone, and stir at 20 - 30 Hz and 100 - 200 rpm for 30 - 50 min to obtain a noise-reducing and anti-skid asphalt composition.

[0010] Further, the mass ratio of the chlorosulfonic acid to the tetrahydrofuran described in step (1) is 1:50 - 100.

[0011] Further, the flow rate of the gas described in step (2) is 0.04 - 0.1 L / min.

[0012] Further, the rubber material described in step (3) is composed of methyl vinyl silicone rubber, carbon nanotubes, and rigid materials, and the mass ratio of its components is 10:0.1:1.

[0013] Further, the rigid material is at least one of silica, alumina, zinc oxide, and carbon black.

[0014] Further, the temperature of the kneading in step (3) is 200 - 260 °C and the time is 3 - 8 h.

[0015] Further, the process parameters of the extrusion granulation in step (3): the temperature is 280 - 350 °C, the screw diameter is 1 - 3 mm, and the shear rate is 100 - 200 rpm.

[0016] Further, the process parameters of the supercritical foaming treatment in step (3): nitrogen is used as the foaming agent, the temperature is 80 °C, the time is 1 - 2 h, and the pressure is 12 - 18 MPa.

[0017] Further, the mass ratio of the rubber material, the modified granite particles, and the volcanic rock particles with a particle size of 0.5 - 2 mm in step (3) is 10:1 - 5:5.

[0018] Further, the mass ratio of the No. 90 matrix asphalt, antioxidant 168, portland cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone in step (4) is 7: 0.05: 2-3: 12.5: 2-3: 10: 12: 1: 1.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention uses granite as the fine aggregate, modifies its surface, and performs sulfonation treatment at high temperature. Through high temperature, the minerals in granite expand and crack. Due to the expansion difference between feldspar and quartz minerals, protrusions appear on the particle surface, making the overall texture rough, and thus presenting a macroscopic texture. At the same time, surface impurities can be removed and the pore structure can be optimized. Furthermore, by increasing the specific surface area of the solid skeleton in the asphalt composition, the drainage performance is enhanced, thereby achieving anti-slip performance. At the same time, a large number of interconnected pores are formed inside the mixture, which can not only enhance the noise reduction performance but also improve the aging resistance of asphalt by enhancing the heat dissipation performance. Moreover, the chemical bonds at the mineral lattice defects gradually break and expose hydroxyl groups, which then react with sulfonated substances to form covalently bonded sulfonic acid groups. Then, the rubber material is used to coat it. Through the polar groups in it, hydrogen bonds are formed with the sulfonic acid groups on the surface of the aggregate, which helps to enhance the bonding performance between granite and rubber. Then, the rubber is foamed. Through the elastic foam layer on the surface of the aggregate, the noise reduction and anti-slip performance are greatly improved. In addition, the rigid materials and carbon nanotubes in the rubber material can be embedded in the pore structure on the surface of granite, which not only enhances the support of the foam layer and realizes long-term noise reduction and anti-slip performance but also enhances the heat dissipation performance of the asphalt composition through the connection structure between carbon nanotubes and granite, thereby improving the aging resistance of asphalt. Finally, it is compounded with porous volcanic rock particles to form pore channels with the foamed rubber structure, enhancing the noise reduction and drainage performance. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In order to more clearly illustrate the method provided by the present invention, the following examples are used for detailed description. The test methods for each index of the noise-reducing and anti-slip asphalt composition prepared in the following examples are as follows:

[0022] Noise reduction: Specimens with a thickness of 80 mm were made from the examples and comparative examples. Referring to GB1496 - 79, a TES - 1352H type noise meter was used to detect the decibel value generated under the condition of a vehicle speed of 60 km / h. Then, it was repeatedly rolled by a rubber tire at a temperature of 60 °C for 24 h, and the decibel value was measured again.

[0023] Skid resistance: Specimens of the same size from the examples and comparative examples were used to detect the skid resistance performance of the composition in a wet state using a British ELE - 6000 type. The friction coefficient BPN was used as the evaluation index. Then, it was repeatedly rolled by a rubber tire at a temperature of 60 °C for 24 h, and the friction coefficient BPN was measured again.

[0024] Example 1

[0025] (1) Chlorosulfonic acid and tetrahydrofuran were mixed to obtain a solution, which was vaporized into a gas; the mass ratio of chlorosulfonic acid to tetrahydrofuran was 1:50.

[0026] (2) Granite particles with a particle size of 0.2 mm were heated from 1 °C / min to 300 °C under a nitrogen flow rate of 0.04 L / min, held for 0.5 h, and then the gas described in step (1) was introduced until the percentage of nitrogen in the total volume was 30%. Under the condition of a confining pressure of 10 MPa, it was treated for 30 min to obtain modified granite particles.

[0027] (3) The rubber material and the modified granite particles were mixed and kneaded at a temperature of 200 °C for 3 h, and then extruded and pelletized. The process parameters were: temperature of 280 °C, screw diameter of 1 mm, shear rate of 100 rpm, and supercritical foaming treatment was carried out. The process parameters were: nitrogen as the foaming agent, temperature of 80 °C, time of 1 h, pressure of 12 MPa. Finally, it was compounded with volcanic rock particles with a particle size of 0.5 mm to obtain fine aggregate; the mass ratio of the rubber material, modified granite particles, and volcanic rock particles with a particle size of 0.5 mm was 10:1:5; the rubber material was composed of methyl vinyl silicone rubber, carbon nanotubes, and alumina, and the mass ratio of its components was 10:0.1:1.

[0028] (4) 90# matrix asphalt and antioxidant 168 were mixed and heated to 170 °C, stirred at 60 rpm for 4 h, and then silicate cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone were added, and stirred at 20 Hz and 100 rpm for 30 min to obtain a noise - reducing and skid - resistant asphalt composition; the mass ratio of 90# matrix asphalt, antioxidant 168, silicate cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone was 7:0.05:212.5:2:10:12:1:1.

[0029] Example 2

[0030] (1) Mix chlorosulfonic acid and tetrahydrofuran to obtain a solution, and vaporize it into a gas; the mass ratio of chlorosulfonic acid to tetrahydrofuran is 1:75;

[0031] (2) Under the condition of nitrogen with a flow rate of 0.07 L / min, heat granite particles with a particle size of 0.6 mm from 3 °C / min to 400 °C, keep it warm for 1 h, then introduce the gas described in step (1) until the percentage of nitrogen in the total volume is 30%, and under the condition of a confining pressure of 15 MPa, treat it for 30 min to obtain modified granite particles;

[0032] (3) Mix the rubber material and the modified granite particles by kneading at a temperature of 230 °C for 5 h, then extrude and pelletize. The process parameters are: temperature of 310 °C, screw diameter of 2 mm, and shear rate of 150 rpm. Perform supercritical foaming treatment. The process parameters are: nitrogen as the foaming agent, temperature of 80 °C, time of 1.5 h, and pressure of 15 MPa. Finally, compound it with volcanic rock particles with a particle size of 1.2 mm to obtain fine aggregate; the mass ratio of the rubber material, the modified granite particles, and the volcanic rock particles with a particle size of 1.2 mm is 10:3:5; the rubber material is composed of methyl vinyl silicone rubber, carbon nanotubes, and alumina, and the mass ratio of its components is 10:0.1:1;

[0033] (4) Mix No. 90 matrix asphalt and antioxidant 168, heat it to 180 °C, stir at 120 rpm for 6 h, add portland cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone, and stir at 25 Hz and 150 rpm for 40 min to obtain a noise-reducing and anti-skid asphalt composition; the mass ratio of No. 90 matrix asphalt, antioxidant 168, portland cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone is 7:0.05:2.5:12.5:2.5:10:12:1:1.

[0034] Example 3

[0035] (1) Mix chlorosulfonic acid and tetrahydrofuran to obtain a solution, and vaporize it into a gas; the mass ratio of chlorosulfonic acid to tetrahydrofuran is 1:100;

[0036] (2) Under the condition of nitrogen with a flow rate of 0.1 L / min, heat granite particles with a particle size of 1 mm from 5 °C / min to 500 °C, keep it warm for 2 h, then introduce the gas described in step (1) until the percentage of nitrogen in the total volume is 30%, and under the condition of a confining pressure of 20 MPa, treat it for 30 min to obtain modified granite particles;

[0037] (3) Mix the rubber material and modified granite particles, with a temperature of 260 °C and a time of 8 h, then extrude and pelletize. The process parameters are: temperature of 350 °C, screw diameter of 3 mm, and shear rate of 200 rpm. Conduct supercritical foaming treatment, with the process parameters: nitrogen as the foaming agent, temperature of 80 °C, time of 2 h, and pressure of 18 MPa. Finally, compound with volcanic rock particles with a particle size of 2 mm to obtain fine aggregate; the mass ratio of the rubber material, modified granite particles, and volcanic rock particles with a particle size of 2 mm is 10:5:5; the rubber material is composed of methyl vinyl silicone rubber, carbon nanotubes, and alumina, and the mass ratio of its components is 10:0.1:1;

[0038] (4) Mix 90# base asphalt and antioxidant 168, heat up to 190 °C, stir at 200 rpm for 8 h, add portland cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone, and stir at 30 Hz and 200 rpm for 50 min to obtain a noise-reducing and anti-skid asphalt composition; the mass ratio of 90# base asphalt, antioxidant 168, portland cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone is 7:0.05:3:12.5∶3:10:12:1:1.

[0039] Comparative Example 1

[0040] The difference between Comparative Example 1 and Example 2 is that steps (1) and (2) are absent. Modify step (3) as follows: Mix the rubber material and granite particles with a particle size of 0.6 mm, with a temperature of 230 °C and a time of 5 h, then extrude and pelletize. The process parameters are: temperature of 310 °C, screw diameter of 2 mm, and shear rate of 150 rpm. Conduct supercritical foaming treatment, with the process parameters: nitrogen as the foaming agent, temperature of 80 °C, time of 1.5 h, and pressure of 15 MPa. Finally, compound with volcanic rock particles with a particle size of 1.2 mm to obtain fine aggregate; the mass ratio of the rubber material, granite particles with a particle size of 0.6 mm, and volcanic rock particles with a particle size of 1.2 mm is 10:3:5; the rubber material is composed of methyl vinyl silicone rubber, carbon nanotubes, and alumina, and the mass ratio of its components is 10:0.1:1; the remaining steps are the same as those in Example 2.

[0041] Comparative Example 2

[0042] The difference between Comparative Example 2 and Example 2 lies in step (3). Step (3) is modified as follows: Mix the rubber material and the modified granite particles at a temperature of 230°C for 5 hours, then extrude and pelletize them. The process parameters are: temperature of 310°C, screw diameter of 2 mm, and shear rate of 150 rpm. Finally, compound with volcanic rock particles with a particle size of 1.2 mm to obtain fine aggregate; the mass ratio of the rubber material, the modified granite particles, and the volcanic rock particles with a particle size of 1.2 mm is 10:3:5; the rubber material consists of methyl vinyl silicone rubber, carbon nanotubes, and alumina, and the mass ratio of its components is 10:0.1:1; the remaining steps are the same as those in Example 2.

[0043] Comparative Example 3

[0044] The difference between Comparative Example 3 and Example 2 lies in step (3). Step (3) is modified as follows: Compound the modified granite particles with volcanic rock particles with a particle size of 1.2 mm to obtain fine aggregate; the mass ratio of the modified granite particles to the volcanic rock particles with a particle size of 1.2 mm is 3:5; the remaining steps are the same as those in Example 2.

[0045] Comparative Example 4

[0046] The difference between Comparative Example 4 and Example 2 lies in step (3). Step (3) is modified as follows: Mix the rubber material and the modified granite particles at a temperature of 230°C for 5 hours, then extrude and pelletize them. The process parameters are: temperature of 310°C, screw diameter of 2 mm, and shear rate of 150 rpm. Then conduct supercritical foaming treatment with the process parameters: nitrogen as the foaming agent, temperature of 80°C, time of 1.5 hours, and pressure of 15 MPa to obtain fine aggregate; the mass ratio of the rubber material to the modified granite particles is 10:3; the rubber material consists of methyl vinyl silicone rubber, carbon nanotubes, and alumina, and the mass ratio of its components is 10:0.1:1; the remaining steps are the same as those in Example 2.

[0047] Effect Example

[0048] The following Table 1 shows the performance analysis results of the noise-reducing and anti-skid asphalt compositions of Examples 1 to 3 and Comparative Examples 1 to 4 of the present invention.

[0049] Table 1

[0050] Decibel value (dB) Decibel value (60°C, 24 h, dB) BPN BPN (60°C, 24 h) Example 1 62.9 63.7 79 77 Example 2 62.7 63.3 82 81 Example 3 63.1 63.9 77 75 Comparative Example 1 65.2 68.4 74 69 Comparative Example 2 67.8 68.6 76 75 Comparative Example 3 69.6 68.5 75 70 Comparative Example 4 67.5 68.1 75 72

[0051] From the comparison of the experimental data of the examples and comparative examples in Table 1, it can be found that in the present invention, granite is used as fine aggregate, and its surface is first sulfonated and modified at high temperature. Through high temperature, the minerals in granite expand and crack. Due to the expansion difference between feldspar and quartz minerals, the overall texture becomes rough, and thus macroscopic texture is presented. At the same time, surface impurities can be removed and the pore structure can be optimized. Furthermore, by increasing the specific surface area of the solid skeleton in the asphalt composition, the drainage performance is enhanced, thereby achieving anti-slip performance. At the same time, a large number of interconnected pores are formed inside the mixture, which can not only enhance the noise reduction performance, but also improve the anti-aging performance of asphalt by enhancing the heat dissipation performance. Moreover, the chemical bonds at the mineral lattice defects gradually break and expose hydroxyl groups, which then react with sulfonated substances to form covalently bonded sulfonic acid groups. Then, the rubber material is used to coat it, and hydrogen bonds are formed between the polar groups therein and the sulfonic acid groups on the surface of the aggregate, which helps to enhance the bonding performance between granite and rubber. Then, the rubber is foamed, and through the elastic foam layer on the surface of the aggregate, the noise reduction and anti-slip performance are greatly improved. And the rigid materials and carbon nanotubes in the rubber material can be embedded in the pore structure on the surface of granite, that is, the support of the foam layer is enhanced and the long-term noise reduction and anti-slip performance are achieved. Also, through the connection structure between carbon nanotubes and granite, the heat dissipation performance of the asphalt composition is enhanced, and thus the anti-aging performance of asphalt is improved. Finally, porous volcanic rock particles and the foamed rubber structure form an air hole channel to enhance the noise reduction and drainage performance.

[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claim.

Claims

1. A method for preparing a noise-reducing and anti-skid asphalt composition, characterized in that: The following steps are involved: (1) mixing chlorosulfonic acid and tetrahydrofuran to obtain a solution, and vaporizing the solution into a gas; (2) heating the granite particles with a particle size of 0.2 to 1 mm at a rate of 1 to 5° C. / min to 300 to 500° C. under nitrogen protection, maintaining the temperature for 0.5 to 2 h, and then introducing the gas described in step (1) until the percentage of nitrogen in the total volume is 30%, and treating for 30 min at a confining pressure of 10 to 20 MPa to obtain modified granite particles; (3) The rubber material and modified granite particles are mixed, extruded and granulated, and then subjected to supercritical foaming treatment, and finally compounded with volcanic rock particles with a particle size of 0.5 to 2 mm to obtain fine aggregate; (4) Mix No. 90 base asphalt and antioxidant 168, heat to 170-190°C, stir at 60-200 rpm for 4-8 hours, add silicate cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone, and stir at 20-30 Hz and 100-200 rpm for 30-50 minutes to obtain a noise-reducing and anti-skid asphalt composition.

2. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: The mass ratio of chlorosulfonic acid to tetrahydrofuran in step (1) is 1:50-100.

3. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: The flow rate of the gas in step (2) is 0.04-0.1 L / min.

4. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: The rubber material in step (3) is composed of methyl vinyl silicone rubber, carbon nanotubes and rigid material, and the mass ratio of the components is 10:0.1:

1.

5. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 4, characterized in that: The rigid material is at least one of silicon dioxide, aluminum oxide, zinc oxide and carbon black.

6. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: The mixing temperature in step (3) is 200-260° C. and the mixing time is 3-8 hours.

7. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: The process parameters of the extrusion granulation in step (3) are: temperature of 280-350° C., screw diameter of 1-3 mm, and shear rate of 100-200 rpm.

8. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: The process parameters of the supercritical foaming treatment in step (3) are: nitrogen as the foaming agent, temperature of 80° C., time of 1 to 2 h, and pressure of 12 to 18 MPa.

9. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: In step (3), the mass ratio of the rubber material, the modified granite particles, and the volcanic rock particles with a particle size of 0.5 to 2 mm is 10:1 to 5:

5.

10. The method for preparing a noise-reducing and anti-skid asphalt composition according to claim 1, characterized in that: In step (4), the mass ratio of No. 90 base asphalt, antioxidant 168, silicate cement, fine aggregate, lignin fiber, limestone with a particle size of 12 mm, limestone with a particle size of 8 mm, terpene resin, and acetone is 7:0.05:2-3:12.5:2-3:10:12:1:1.