Noise reduction asphalt composition and construction method thereof

Abstract

The present application provides a noise reduction asphalt composition and a construction method thereof, including a bonding layer, an aggregate and an aggregate. The bonding layer is prepared by modifying a base asphalt using a viscosity modifier and a noise reduction modifier, and then used in combination with the aggregate, thereby greatly improving the bonding force between the bonding layer and the aggregate. Through the waste red brick particles, glass wool, hollow silica nanospheres and the like in the noise reduction modifier, after the pavement is paved, a resonant noise reduction structure is formed on the surface layer of the road, and a porous sound-absorbing and noise-reducing structure is formed on the inner layer of the road, thereby greatly improving the noise reduction ability of the road, utilizing the structural characteristics of coal slag, improving the noise reduction performance of the road while utilizing waste, promoting the construction of an environmentally friendly society, and extending the service life of the pavement.

Description

Technical Field

[0001] The invention belongs to the field of road construction materials, and particularly relates to a noise-reducing asphalt composition and a construction method thereof. Background Art

[0002] In recent years, with the rapid development of my country's high-grade highway construction, vehicle speeds are increasing, traffic volume is also increasing, and the impact of traffic noise is becoming increasingly prominent. The noise has caused public harm to residents along the road and has even developed into a widespread social problem. Reducing vehicle driving noise has become one of the main ways to control environmental pollution. Tire-road noise mainly includes pumping noise and vibration noise. During the vehicle's driving process, the tread on the tire contacts the road surface, and the air in the tread is squeezed out, forming a local unstable air volume flow. When the tire is pressed into the unconnected gap in the road surface, the air will also be squeezed out of the gap to generate vibration and then noise. When the tire leaves the contact surface, the air will quickly fill back into the gaps between the tire pattern and the road surface to generate noise again. The existing road noise reduction methods commonly used are: 1. Adding a wear layer, that is, paving a noise reduction functional layer on the surface, the thickness is generally about 2 cm, generally not more than 4 cm; the second is a porous noise reduction structural layer, that is, the road structure part. The noise reduction capacity of the existing noise reduction functional layer is generally 4-6 decibels. Road sections with heavy traffic volume must also be used in conjunction with noise reduction partitions. The noise reduction effect is not obvious, and there are also a series of problems such as low adhesion, serious floating sand problems, and thus cracking of the road surface. There is an urgent need for a noise reduction asphalt composition with obvious noise reduction effect. Summary of the Invention

[0003] In order to solve the technical problems that the existing road noise reduction functional layer has a general noise reduction ability, low internal bonding strength, and is prone to cracking and a large amount of floating sand after opening to traffic, the present invention proposes a noise reduction asphalt composition;

[0004] A second object of the present invention is to provide a construction method for the noise reduction asphalt composition.

[0005] In order to achieve the first purpose, this application adopts the following scheme:

[0006] A noise reduction asphalt composition, comprising a bonding layer and aggregate, wherein the bonding layer comprises the following components in parts by weight:

[0007]

[0008] The noise reduction modifier is composed of the following components in parts by weight:

[0009]

[0010] The hollow silica nanospheres have a particle size of 50-60 μm, are low in cost, have a spherical structure and a smooth surface, high compressive strength, good fluidity and stability, and are modified and mixed with polyurethane to enhance the affinity between the hollow silica nanospheres and the matrix asphalt. During the modification process, the hollow silica nanospheres invade into the matrix asphalt system to form nanopores inside the matrix asphalt. When road noise waves are generated, they are attenuated by a large number of nanopores, thereby achieving a road noise reduction effect. The particle size of the waste red brick particles is 0.3-0.5 mm, the particle size of the waste straw modified fiber is 0.5-0.7 mm, the glass wool in the noise reduction modifier is coarse flocculent glass wool, and the volume density of the glass wool is 12-25 kg / m 3 , the fiber diameter is 3-8μm. By designing the proportions of the above components and dispersing them in polyurethane, the glass wool fiber can connect hollow silica nanospheres, waste red brick particles and waste straw modified fibers with increasing particle sizes into a larger, stronger and more affinity-compatible porous sound-absorbing structure with matrix asphalt. Moreover, through the compounding of multiple porous structures, the degree of disorder of the porous structure is increased, and the noise reduction effect in different frequency bands is significantly improved, and the noise attenuation effect is significantly improved.

[0011] Preferably, the method for preparing waste straw modified fiber in the noise reduction modifier comprises the following steps:

[0012] S01. Grind an appropriate amount of waste straw and sieve it with a sieve aperture of 0.5-0.7 mm;

[0013] S02. The waste straw powder obtained by sieving in step S01 was added into a 0.9-1.8 mol / L NaOH solution, stirred at 80-87 ° C, 120-210 rpm for 0.6-1.2 h, and then filtered and dried to obtain crude waste straw modified fiber;

[0014] S03. The crude waste straw modified fiber obtained in step S02 is immersed in a MAPP-butyl formate solution with a mass fraction of 1-2.5% for 1-1.5 hours, and the waste straw modified fiber is obtained after drying; the waste straw fiber prepared by this method has a high affinity with polyurethane, an increased content of wood porous structure, and significantly improved toughness and flexural modulus, thereby improving the noise reduction ability while ensuring the connection strength of the road surface.

[0015] Preferably, the method for preparing the waste red brick particles in the noise reduction modifier comprises the following steps:

[0016] The waste red bricks are preliminarily crushed into coarse red brick particles with a particle size of 1.2-2.6 mm using a crusher, and then the coarse red brick particles are ground into a particle size of 0.3-0.5 mm to obtain waste red brick particles.

[0017] Preferably, the preparation method of the noise reduction modifier comprises the following steps:

[0018] S11. The polyurethane was added to a stirred tank and stirred at 35-45 ° C and 180-240 rpm for 10-18 min;

[0019] S12. The hollow silica nanospheres, waste red brick particles and waste straw modified fibers were sequentially placed in a stirred tank and stirred at 50-60 ° C, 250-280 rpm for 30-40 min;

[0020] S13. Prepare glass wool into glass wool balls weighing 0.2-0.8 kg, and add the glass wool balls into the stirring tank three times. The weight ratio of the glass wool balls added into the stirring tank three times is 1:2-3:5-6. The first stirring is stirred at 30-40 ° C and 120-200 rpm.

[0021] 10-18min; the second stirring is carried out at 35-45℃ and 220-250rpm.

[0022] The third stirring is carried out at 60-65°C and 350-550 rpm for 50-70 minutes to obtain the noise reduction modifier.

[0023] The glass wool balls are divided into three times and the stirring speed and time are increased step by step to improve the uniform dispersion of glass wool fibers in the polyurethane system. The stirring temperature is increased step by step to increase the fluidity of polyurethane in a step-by-step manner, thereby improving the degree of connection between hollow silica nanospheres, waste red brick particles and waste straw modified fibers and glass wool fibers. The content of porous sound-absorbing structures in the polyurethane system is increased, and the irregularity of the porous sound-absorbing structures is increased. When mixed with modified matrix asphalt, a multi-dimensional noise reduction structure is formed in combination with noise reduction aggregates, which not only has good noise reduction performance but also can ensure a high bonding force.

[0024] Preferably, the viscosity modifier is composed of the following components in parts by weight:

[0025] SBS modifier 5-10 parts

[0026] 3-5 parts of acrylic modified epoxy resin

[0027] 1-3 parts of modified methyl phenolic resin

[0028] The preparation method of the viscosity modifier comprises the following steps:

[0029] Add modified methyl phenolic resin, acrylic modified epoxy resin and SBS modifier into the reaction kettle at once, and stir at 50-60° C. and 180-220 rpm for 10-20 minutes to obtain the product.

[0030] The acrylic modified epoxy resin is obtained by grafting acrylic acid to an epoxy resin system under the action of catalysts and other auxiliary agents at 80-90°C and 100-150rpm for 10-30 minutes. After modification, the acrylic modified epoxy resin has improved fluidity and enhanced connecting ability. When compounded with an SBS modifier, a large number of cross-linked network structures are present in the process of modifying the matrix asphalt, which significantly improves the connecting ability of the matrix asphalt and ensures sufficient connecting strength with each component in the noise reduction modifier, so that the high-strength connection in the matrix asphalt has a porous sound-absorbing structure that is as evenly distributed as possible, thereby significantly improving the noise reduction performance of the road surface.

[0031] Preferably, the aggregate is composed of the following components in parts by weight:

[0032]

[0033] Preferably, the particle size of the granite, basalt and diabase is 5-15 mm, the particle size of the waste red brick particles is 3-5 mm, the particle size of the coal slag is 0.5-2 mm, the aspect ratio of the glass fiber segment is 15-20:1, and the diameter of the glass fiber segment is 0.3-0.8 mm;

[0034] The preparation method of the aggregate comprises the following steps:

[0035] Put each component into a mixer in turn and stir at room temperature and 300-450 rpm for 10-20 minutes. After stirring, add lime slurry and stir at 30-40°C and 450-500 rpm for 10-20 minutes to obtain a mass ratio of the aggregate to the lime slurry of 12-16:1.

[0036] The coal slag and waste red brick particles are both porous in structure, and the two are used as fine aggregates and compounded with the bonding layer. The coal slag contains a large amount of porous materials such as silica and alumina. When used with modified asphalt, it can ensure its strength while meeting the sound absorption and noise reduction needs of roads. At the same time, it can also reduce the pressure of solid waste emissions in the thermal power generation industry and promote the construction of an environmentally friendly society; the waste red brick particles are prepared from common construction waste waste red bricks. Red bricks are volcanic ash materials. Their nano-scale micropores can be combined with glass fiber segments to increase the sound-absorbing pore structure content in the asphalt system under the action of modified asphalt. It can also play a catalytic role. After the aggregate is added into lime slurry for modification, the bonding strength between the neutral aggregate and the acidic aggregate and the bonding layer is significantly improved. By simultaneously modifying the aggregate and the matrix asphalt, the degree of connection between the two is significantly improved. Therefore, while the system porosity increases, the bonding strength between the aggregate and the bonding layer can still be improved.

[0037] Preferably, the method for preparing the bonding layer comprises the following steps:

[0038] S21. The matrix asphalt is put into the shearing machine and high-speed shearing is carried out at 135-155 ° C and 800-1100 rpm for 15-22 min;

[0039] S22. The viscosity modifier, dispersant and toughening agent are sequentially put into the shearing machine and high-speed shearing is carried out at 140-155 ° C and 800-900 rpm for 30-40 min;

[0040] S23. Put the noise reduction modifier and asphalt stabilizer into the shearing machine in sequence.

[0041] The product is obtained by high-speed shearing at 155-160°C and 1000-1200 rpm for 1.5-2 hours.

[0042] In order to achieve the second purpose, this application adopts the following technical solutions:

[0043] A construction method for a noise-reducing asphalt composition comprises the following steps:

[0044] S31. Heat the aggregate to 170-190℃ and put it into the mixer. Add the bonding layer and mix it at 180-200℃ and 1600-1800rpm for 10-15min. Then cool it down to

[0045] After the temperature reaches 155-165℃, it is spread on the road surface at a paving speed of 3-4m / min and a paving coefficient of 1.15-1.2;

[0046] S32. After the pavement paved in step S31 has been cured to a certain strength, the road surface is compacted using a roller;

[0047] S33. After the road surface is compacted in step S32, an asphalt spreader is used to spread the bonding layer. After curing to a certain strength, the road surface is rolled 4-5 times using a road roller.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] 1. The present application provides a noise reduction asphalt composition and a construction method thereof, comprising a bonding layer, aggregate and aggregate. The bonding layer is modified by using a viscosity modifier and a noise reduction modifier to modify the base asphalt, and then used in combination with the aggregate, thereby greatly improving the bonding force between the bonding layer and the aggregate. Through the waste red brick particles, glass wool, hollow silica nanospheres, etc. in the noise reduction modifier, after the pavement is paved, a resonant noise reduction structure is formed on the surface layer of the road, and a porous sound-absorbing and noise-reducing structure is formed on the inner layer of the road, thereby greatly improving the noise reduction ability of the road. The structural characteristics of coal slag are utilized to improve the noise reduction performance of the road while utilizing waste, promote the construction of an environmentally friendly society, and extend the service life of the road.

[0050] 2. The noise reduction asphalt composition construction method provided in this application is simple, quick, and easy to promote. With the cooperation of corresponding highway equipment, it can be paved efficiently, with a short curing time and a fast traffic speed. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with specific examples 1-3 and comparative examples 1-3:

[0052] (1) Prepare the viscosity modifier according to the weight parts shown in Table 1:

[0053] The modified methyl phenolic resin, acrylic modified epoxy resin and SBS modifier were added into the reactor at once, and stirred at 55° C. and 200 rpm for 18 minutes to obtain the product.

[0054] (2) Prepare the noise reduction modifier according to the weight parts shown in Table 1:

[0055] The method for preparing waste straw modified fiber comprises the following steps:

[0056] S01. Crushed and sieved an appropriate amount of waste straw with a sieve aperture of 0.6 mm;

[0057] S02. The waste straw powder obtained by sieving in step S01 was added into a 1.5 mol / L NaOH solution, stirred at 80°C and 170 rpm for 1 h, and then filtered and dried to obtain crude waste straw modified fiber;

[0058] S03. The crude waste straw modified fiber obtained in step S02 is soaked in a 2% by mass MAPP-butyl formate solution for 1-1.5 hours, and then dried to obtain the waste straw modified fiber.

[0059] The method for preparing waste red brick particles comprises the following steps:

[0060] The waste red bricks are preliminarily crushed into coarse red brick particles with a particle size of 2 mm using a crusher, and then the coarse red brick particles are ground into a particle size of 0.3 mm to obtain waste red brick particles.

[0061] The preparation method of the noise reduction modifier comprises the following steps:

[0062] S11. The polyurethane was added to a stirred tank and stirred at 40°C and 220 rpm for 18 min;

[0063] S12. The hollow silica nanospheres, waste red brick particles and waste straw modified fibers were sequentially placed in a stirred tank and stirred at 60 ° C and 265 rpm for 35 min;

[0064] S13. Prepare glass wool into glass wool balls weighing 0.3 kg, and add the glass wool balls into a stirring tank for three times for stirring and dispersion. The weight ratio of the glass wool balls added into the stirring tank for three times is 1:2:6. The first stirring is carried out at 30°C and 180 rpm for 15 minutes; the second stirring is carried out at 45°C and 230 rpm for 30 minutes; the third stirring is carried out at 60°C and 480 rpm for 60 minutes to obtain the noise reduction modifier.

[0065] (3) Aggregate preparation was performed according to the weight proportions shown in Table 1, including the following steps:

[0066] Each component was sequentially put into a mixer and stirred at room temperature and 400 rpm for 18 minutes. After the stirring was completed, lime slurry was added and stirred at 40°C and 480 rpm for 20 minutes. The mass ratio of the aggregate to the lime slurry was 15:1.

[0067] (4) The preparation of the adhesive layer according to the weight parts shown in Table 1 includes the following steps:

[0068] S21. The matrix asphalt was put into the shearing machine and sheared at 145°C and 1100 rpm for 22 min.

[0069] S22. The viscosity modifier, dispersant and toughening agent are sequentially put into the shearing machine and high-speed shearing is carried out at 150°C and 900 rpm for 30 min.

[0070] S23. The noise reduction modifier and the asphalt stabilizer are sequentially placed into a shearing machine and subjected to high-speed shearing at 155° C. and 1200 rpm for 1.5 h.

[0071] Example 1: A construction method for a noise-reducing asphalt composition

[0072] S31. Aggregate and binder coat are mixed in a mass ratio of 2:57, as shown in Table 1. After heating the aggregate to 170°C and placing it in a mixer, add the binder coat. Mix at 180°C and 1600 rpm for 10 minutes, cool to 155°C, and spread on the pavement at a paving speed of 3 m / min and a paving coefficient of 1.16.

[0073] S32. After the pavement paved in step S31 has been cured to a certain strength, the road surface is compacted using a roller;

[0074] S33. After the road surface is compacted in step S32, an asphalt spreader is used to spread the bonding layer. After curing to a certain strength, the road surface is rolled 5 times using a road roller.

[0075] Example 2: A construction method for a noise-reducing asphalt composition

[0076] S31. Aggregate:Binder coat:A weight ratio of 2.4:58. Heat the aggregate to 175°C and place it in a mixer according to the composition shown in Table 1. Add the binder coat and mix at 185°C and 1650 rpm for 11 minutes. Cool to 160°C and spread on the pavement at a spreading speed of 3 m / min and a spreading coefficient of 1.18.

[0077] S32. After the pavement paved in step S31 has been cured to a certain strength, the road surface is compacted using a roller;

[0078] S33. After the road surface is compacted in step S32, an asphalt spreader is used to spread the bonding layer. After curing to a certain strength, the road surface is rolled 5 times using a road roller.

[0079] Example 3: A construction method for a noise-reducing asphalt composition

[0080] S31. Aggregate:Binder coat:A weight ratio of 2:57.4. Heat the aggregate to 180°C and place it in a mixer according to the composition shown in Table 1. Add the binder coat and mix at 185°C and 1680 rpm for 13 minutes. Cool to 160°C and spread on the pavement at a paving speed of 3 m / min and a paving coefficient of 1.18.

[0081] S32. After the pavement paved in step S31 has been cured to a certain strength, the road surface is compacted using a roller;

[0082] S33. After the road surface is compacted in step S32, an asphalt spreader is used to spread the bonding layer. After curing to a certain strength, the road surface is rolled 5 times using a road roller.

[0083] Comparative Example 1: The hollow silica nanospheres, waste red brick particles, waste straw modified fibers and glass wool in the noise reduction modifier in Example 2 were removed, and the weight percentages of the matrix asphalt and aggregate were appropriately increased, while the other components remained unchanged.

[0084] Comparative Example 2: The coal slag, red brick particles and glass fiber segments in the aggregate in Example 2 were removed, and the weight percentages of other components and matrix asphalt in the aggregate were appropriately increased, while the other components remained unchanged.

[0085] Comparative Example 3: The hollow silica nanospheres, waste red brick particles, waste straw modified fibers and glass wool in the noise reduction modifier in Example 2, as well as the coal slag, red brick particles and glass fiber segments in the aggregate are removed at the same time, and the weight proportions of other components and matrix asphalt in the aggregate are appropriately increased, while the other components remain unchanged.

[0086] Table 1 Components of bonding layer and aggregate in Examples 1-3 and Comparative Examples 1-3 by weight

[0087]

[0088]

[0089] Examples 1-3 and Comparative Examples 1-3 were prepared for bonding layer test pieces in accordance with JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering," and were tested as shown in Table 2 in accordance with GBJ47-85 "Standing Wave Tube Method for Measurement of Sound Absorption Coefficient and Acoustic Impedance." Noise detection was conducted using a pavement simulation test method, i.e., the same test vehicle was used to simulate traffic on the test roads paved in Examples 1-3 and Comparative Examples 1-3. The noise inside the test vehicle and at different locations in Examples 1-3 and Comparative Examples 1-3 were measured using a decibel meter. The test results are as follows.

[0090] Table 2 Test results of Examples 1-3 and Comparative Examples 1-3

[0091]

[0092]

[0093] It can be seen from the test results in Table 2 that in Comparative Example 1, the hollow silica nanospheres, waste red brick particles, waste straw modified fibers and glass wool in the noise reduction modifier are removed. The particle size of the hollow silica nanospheres is 50-60 μm. The hollow silica nanospheres are low in cost, have a spherical structure and a smooth surface, high compressive strength, good fluidity and stability. By modifying and mixing with polyurethane, the affinity of the hollow silica nanospheres to the matrix asphalt is improved. During the modification process, the hollow silica nanospheres invade into the matrix asphalt system to form nanopores inside the matrix asphalt. When road noise waves are generated and enter a large number of nanopores, they are attenuated, thereby achieving a road noise reduction effect. The particle size of the waste red brick particles is 0.3-0.5 mm, the particle size of the waste straw modified fibers is 0.5-0.7 mm, the glass wool in the noise reduction modifier is coarse flocculent glass wool, and the volume density of the glass wool is 12-25 kg / m 3 , the fiber diameter is 3-8μm. By designing the proportions of the above components and dispersing them in polyurethane, the glass wool fiber can connect the hollow silica nanospheres, waste red brick particles and waste straw modified fibers with increasing particle sizes into a larger, stronger and more affinity-compatible porous sound-absorbing structure with matrix asphalt. Moreover, through the compounding of multiple porous structures, the disorder degree of the porous structure is increased, and the noise reduction effect on different frequency bands is significantly improved. The noise attenuation effect is significantly improved. After removing the hollow silica microspheres, waste red brick particles, waste straw modified fibers and glass wool, the modified paved highway only has the porous sound-absorbing structures of coal slag and red brick particles in the aggregate, and cannot form a sound-absorbing structure with a deeper void depth and a higher degree of irregularity with the internal bonding layer, so that the noise can still be reflected after the surface aggregate of the road surface is attenuated, and still has a high decibel noise.

[0094] In Comparative Example 2, the coal slag, red brick particles and glass fiber segments in the aggregate are removed. The coal slag and waste red brick particles are porous in structure. The two are used as fine aggregate and the bonding layer. The coal slag contains a large amount of porous materials such as silica and alumina. When used with modified asphalt, it can ensure its strength while meeting the sound absorption and noise reduction requirements of the highway. At the same time, it can also reduce the pressure of solid waste emissions from the thermal power generation industry and promote the construction of an environmentally friendly society. The waste red brick particles are prepared from common construction waste waste red bricks. Red bricks are volcanic ash materials. Their nano-scale micropores can be combined with glass fiber segments to increase the sound absorption pore structure content in the asphalt system under the action of modified asphalt. It can also play a catalytic role. The aggregate is put into lime slurry for modification. After modification, the bonding strength between neutral aggregate and acidic aggregate and the bonding layer is significantly improved. By simultaneously modifying the aggregate and matrix asphalt, the degree of connection between the two is significantly improved. Therefore, while the porosity of the system increases, the bonding strength between the aggregate and the bonding layer can still be improved. When the two are removed, the larger-scale sound-absorbing porous structure is missing in the aggregate, and only the micron-level sound-absorbing porous structure of the inner layer of the highway exists. When the highway noise sound waves reach the micron-level sound-absorbing porous structure, they will be directly reflected to the outside, causing the noise to increase instead of decrease. When the two are compounded, the sound-absorbing porous structure in the aggregate plays a sound-guiding role, guiding the noise sound waves into the inner layer of the highway, thereby causing the noise sound waves to be reflected and attenuated through the micron-level sound-absorbing porous structure, achieving an efficient noise reduction effect.

[0095] Comparative Example 3 combines Comparative Examples 1 and 2, and removes all noise reduction functional components. When the viscosity modifier is not removed, the porosity of the highway drops sharply, the content of the sound-absorbing porous structure drops sharply, and the noise reduction performance of the road surface drops significantly, which cannot solve the technical problem raised in this application.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A noise reducing asphalt composition, characterized in that: It is composed of a bonding layer and aggregates. The bonding layer is composed of the following components by weight: 70-85 parts of base asphalt, 6-12 parts of viscosity modifier, 25-35 parts of noise reduction modifier, 3-5 parts of asphalt stabilizer, 3-5 parts of dispersant, and 3-5 parts of toughening agent; The viscosity modifier is composed of the following components by weight: 5-10 parts of SBS modifier, 3-5 parts of acrylic acid modified epoxy resin, and 1-3 parts of modified methyl phenolic resin; The preparation method of the viscosity modifier comprises the following steps: Put modified methyl phenolic resin, acrylic modified epoxy resin and SBS modifier into the reaction kettle in sequence, and stir for 10-20 minutes at 50-60°C and 180-220rpm; The noise reduction modifier is composed of the following components by weight: 16-20 parts of polyurethane, 1-3 parts of hollow silica nanospheres, 4-6 parts of waste red brick particles, 3-5 parts of waste straw modified fibers, and 8-13 parts of glass wool; The aggregate is composed of the following components by weight: 20-26 parts of coal slag, 30-40 parts of granite, 8-10 parts of waste red brick particles, 15-20 parts of basalt, 15-20 parts of diabase, and 3-5 parts of glass fiber segments. The particle size of the granite, basalt and diabase is 5-15mm, the particle size of the waste red brick particles is 3-5mm, the particle size of the coal slag is 0.5-2mm, the aspect ratio of the glass fiber segment is 15-20:1, and the diameter of the glass fiber segment is 0.3-0.8mm.

2. A noise reduction asphalt composition according to claim 1, characterized in that: The preparation method of the aggregate comprises the following steps: each component is sequentially put into a mixer and stirred at room temperature at 300-450 rpm for 10-20 min; after the stirring is completed, lime slurry is added and stirred at 30-40° C. and 450-500 rpm for 10-20 min, so that the mass ratio of the aggregate to the lime slurry is 12-16:

1.

3. A noise reduction asphalt composition according to claim 1, characterized in that: The glass wool in the noise reduction modifier is coarse flocculent glass wool, and the volume density of the glass wool is 12-25 kg / m 3 , the fiber diameter is 3-8μm.

4. The noise reduction asphalt composition according to claim 1, characterized in that: The method for preparing waste straw modified fiber in the noise reduction modifier comprises the following steps: S01. crushing an appropriate amount of waste straw and sieving it, and the sieve hole diameter is 0.5-0.7mm; S02. putting the waste straw powder obtained by sieving in step S01 into a NaOH solution containing 0.9-1.8mol / L, stirring for 0.6-1.2h under the conditions of 80-87℃ and 120-210rpm, filtering and drying to obtain crude waste straw modified fiber; S03. putting the crude waste straw modified fiber obtained in step S02 into a MAPP-butyl formate solution with a mass fraction of 1-2.5% and soaking it for 1-1.5h, and obtaining the waste straw modified fiber after drying.

5. The noise reduction asphalt composition according to claim 1, characterized in that: The preparation method of the waste red brick particles in the noise reduction modifier comprises the following steps: using a crusher to preliminarily crush the waste red bricks into coarse red brick particles with a particle size of 1.2-2.6 mm, and then grinding the coarse red brick particles to a particle size of 0.3-0.5 mm to obtain the waste red brick particles.

6. The noise reduction asphalt composition according to claim 1, characterized in that: The preparation method of the noise reduction modifier comprises the following steps: S11. putting polyurethane into a stirring kettle and stirring at 35-45°C and 180-240rpm for 10-18min; S12. putting hollow silica nanospheres, waste red brick particles and waste straw modified fibers into a stirring kettle in sequence and stirring at 50-60°C and 250-280rpm for 30-40min; S13. preparing glass wool into a glass wool ball with a weight of 0.2-0.8kg, and The glass wool balls are put into the stirring kettle for three times and stirred and dispersed. The weight ratio of the glass wool balls put into the stirring kettle for three times is 1:2-3:5-6. The first stirring is carried out at 30-40°C and 120-200rpm for 10-18min; the second stirring is carried out at 35-45°C and 220-250rpm for 30-40min; the third stirring is carried out at 60-65°C and 350-550rpm for 50-70min to obtain the noise reduction modifier.

7. The noise reduction asphalt composition according to claim 1, characterized in that: The preparation method of the bonding layer includes the following steps: S21. Putting the matrix asphalt into a shearing machine and performing high-speed shearing for 15-22 minutes at 135-155°C and 800-1100rpm; S22. Putting the viscosity modifier, dispersant and toughening agent into the shearing machine in turn, and performing high-speed shearing for 30-40 minutes at 140-155°C and 800-900rpm; S23. Putting the noise reduction modifier and asphalt stabilizer into the shearing machine in turn, and performing high-speed shearing for 1.5-2h at 155-160°C and 1000-1200rpm.

8. A construction method of a noise reduction asphalt composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S31. After the aggregate is heated to 170-190° C., it is put into a mixer, a bonding layer is added, and the mixture is mixed at 180-200° C. and 1600-1800 rpm for 10-15 minutes. After the mixture is cooled to 155-165° C., the mixture is spread on the road surface at a spreading speed of 3-4 m / min and a spreading coefficient of 1.15-1.

2. S32. After the pavement spread in step S31 is cured to a certain strength, a roller is used to compact the pavement. S33. After the pavement compacted in step S32 is compacted, an asphalt spreader is used to spread the bonding layer on the pavement. After the asphalt spreader is cured to a certain strength, a roller is used to compact the pavement 4-5 times.

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