Urban road multifunctional environment-friendly noise-reducing pavement material and preparation method thereof

Abstract

The invention relates to the technical field of municipal roads, in particular to an urban road multifunctional environment-friendly noise-reducing pavement material and a preparation method thereof.The urban road multifunctional environment-friendly noise-reducing pavement material comprises a noise-reducing pavement body, and the noise-reducing pavement body comprises a drainage base layer, a bearing base layer, a bonding layer, a wearing layer and a noise-reducing aggregate layer; the bearing base layer is laid on the top of the drainage base layer, the bonding layer is bonded to the top of the bearing base layer, the wearing layer is bonded to the top of the bonding layer, and the noise reduction aggregate layer is laid on the top of the wearing layer; the rubber particles are added into the noise reduction aggregate layer, so that the pavement can effectively consume sound energy in various modes of sound wave absorption, reflection, scattering and the like in the vehicle driving process, the overall noise reduction capability of the pavement material is improved, the noise reduction function is realized, and the interference of traffic noise to people such as residents, students and patients is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal roads, and specifically relates to a multi-functional environmental protection noise reduction pavement material for urban roads and a preparation method thereof. Background Art

[0002] With the continuous increase in the vehicle ownership, the noise generated by vehicle driving on urban roads has become an environmental problem that cannot be ignored. Traditional pavement materials, such as ordinary asphalt pavements and cement pavements, will generate a large amount of relatively harsh noise during the processes of vehicle tire contacting the road surface and vehicle driving vibration. These noises not only seriously interfere with the daily life of the residents around the road, affecting their rest, study, physical and mental health, but also greatly reduce the environmental quality in noise-sensitive areas such as hospitals, schools, and research institutions, hindering the normal development of related activities;

[0003] During the vehicle driving process on existing ordinary asphalt pavements and cement pavements, due to factors such as the friction between the tire and the road surface and vehicle vibration, a large amount of noise will be generated. These pavement materials lack effective sound absorption and noise reduction mechanisms and cannot significantly attenuate traffic noise, resulting in the continuous propagation and accumulation of noise in the urban environment. Especially in noise-sensitive areas such as residential areas, schools, and hospitals, the impact is more prominent. Moreover, the poor drainage of ordinary pavements is prone to form water accumulation, affecting vehicle driving safety and the service life of the road; after using for a period of time, the anti-slip performance of some pavements decreases, increasing the risk of traffic accidents. Therefore, a multi-functional environmental protection noise reduction pavement material for urban roads and a preparation method thereof are proposed. Summary of the Invention

[0004] In view of this, the present invention provides a multi-functional environmental protection noise reduction pavement material for urban roads and a preparation method thereof to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0005] The technical solution of the present invention is realized as follows: A multi-functional environmental protection noise reduction pavement material for urban roads includes a noise reduction pavement main body, and the noise reduction pavement main body includes a drainage base layer, a load-bearing base layer, a bonding layer, a wearing layer, and a noise reduction aggregate layer;

[0006] The load-bearing base layer is laid on the top of the drainage base layer, the bonding layer is bonded to the top of the load-bearing base layer, the wearing layer is bonded to the top of the bonding layer, and the noise reduction aggregate layer is laid on the top of the wearing layer.

[0007] A preparation method of a multi-functional environmental protection noise reduction pavement material for urban roads includes the following steps:

[0008] Step 1: Preparation and treatment of materials;

[0009] Step 2: Mix design;

[0010] Step 3: Mixing operation;

[0011] Step 4: Paving the road surface;

[0012] Step 5: Compacting and forming;

[0013] Step 6: Maintenance treatment.

[0014] Further preferably, in the said Step 1, prepare the materials required for preparing the noise-reducing road surface main body. Select graded crushed stone as the main aggregate for the drainage base course, with the particle size range between 5 mm and 30 mm. Select natural sand as the auxiliary aggregate, with the particle size between 0.3 mm and 5 mm. Select lignin fiber or polyester fiber as the fiber material. The load-bearing base course usually selects ordinary portland cement, selects crushed stone with a particle size specification of 5 - 30 mm. Select lime as the additive. The bonding layer selects modified emulsified asphalt, which is composed of matrix asphalt, emulsifier, and water. The wearing course uses modified asphalt as the binder. The modified asphalt is SBS modified asphalt, with the penetration between 40 - 60 (0.1 mm), the softening point greater than 80 °C, and the ductility greater than 20 cm. The material for the noise-reducing aggregate layer selects rubber particles, with the particle size of the rubber particles between 2 - 6 mm. The materials of the noise-reducing road surface main body all need to be cleaned and screened. The cleaned aggregate is screened according to the particle size range required by the design.

[0015] Further preferably, in the said Step 2, according to the environment where the noise-reducing road surface main body is located and the traffic flow situation, clarify the required noise reduction effect. Consider the type of traffic load and the magnitude of traffic volume that the road is expected to bear, determine the compressive strength and shear strength bearing capacity indicators that the road surface material should possess, ensure that the road surface can stably bear the vehicle load within the design service life without structural damage. Combine the local climate conditions and the expected service life of the road, set the durability requirements for the mixture. According to the characteristics of the raw materials and the design objectives, initially draw up the mix proportion of the aggregate, bonding material, and added additives, prepare specimens, and conduct various performance tests on the mixture according to the standards. After multiple performance tests and mix proportion adjustments, when all the performance indicators of the mixture meet the design objectives, the final mix proportion can be determined.

[0016] Further preferably, in the said Step 3, first put the preheated coarse aggregate into the mixer. The coarse aggregate should be selected according to the particle size range and gradation required by the design. Then add the fine aggregate according to the design ratio. The fine aggregate is used to fill the voids between the coarse aggregates and together with the coarse aggregates constitutes the aggregate system of the mixture. Then add the preheated asphalt. The asphalt acts as a bonding material to bond the aggregates together. Finally, add the additive to ensure its uniform dispersion in the mixture.

[0017] Further preferably, in the fourth step, before paving the road surface material, a comprehensive inspection is carried out on the base layer to check whether the flatness, compaction degree and strength index of the base layer meet the design requirements. For the asphalt mixture, according to the construction progress arrangement, covering measures are taken to prevent the heat from dissipating too quickly, and then the paving thickness, width and speed are confirmed, and the drainage base layer, the load-bearing base layer, the bonding layer, the wearing course and the noise-reducing aggregate layer are laid in sequence.

[0018] Further preferably, in the fifth step, initial compaction should be carried out immediately after paving, with the compaction speed between 1.5 - 2.5 m / s. After the initial compaction is completed, double compaction is carried out, with the compaction speed between 3 - 4 m / s. After the double compaction is completed, final compaction is carried out, with the compaction speed between 2 - 3 m / s.

[0019] Further preferably, in the sixth step, after the compaction is completed, curing is required. The curing methods are natural curing and curing by spraying a curing agent. The natural curing material gradually cools and solidifies in the natural environment, and the curing time is 1 - 2 days. Curing by spraying a curing agent means spraying the curing agent immediately on the road surface.

[0020] Due to the adoption of the above technical solutions in the embodiments of the present invention, it has the following advantages:

[0021] 1. By adding rubber particles to the noise-reducing aggregate layer in the present invention, the road surface can effectively consume sound energy through various ways such as absorption, reflection, and scattering of sound waves during vehicle driving, improve the overall noise reduction ability of the road surface material, realize the noise reduction function, and greatly reduce the interference of traffic noise on people such as residents, students, and patients.

[0022] 2. In the present invention, the drainage base layer permeates rainwater, enabling the road surface to have good drainage performance, avoiding water accumulation, improving the anti-slip performance of the road surface, and increasing the safety of the road.

[0023] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the above-described illustrative aspects, embodiments and features, further aspects, embodiments and features of the present invention will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the structural diagram of the present invention;

[0026] Figure 2 This is the flowchart of the method of the present invention.

[0027] Reference numerals: 1, main body of noise-reducing road surface; 11, drainage base course; 12, load-bearing base course; 13, bonding layer; 14, wearing course; 15, noise-reducing aggregate layer. Specific embodiments

[0028] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0029] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0030] As Figure 1-2 shown, the embodiments of the present invention provide a multifunctional environmental protection noise-reducing road surface material for urban roads, including a main body 1 of the noise-reducing road surface, and the main body 1 of the noise-reducing road surface includes a drainage base course 11, a load-bearing base course 12, a bonding layer 13, a wearing course 14, and a noise-reducing aggregate layer 15;

[0031] The load-bearing base course 12 is laid on the top of the drainage base course 11, the bonding layer 13 is bonded to the top of the load-bearing base course 12, the wearing course 14 is bonded to the top of the bonding layer 13, and the noise-reducing aggregate layer 15 is laid on the top of the wearing course 14.

[0032] A preparation method of a multifunctional environmental protection noise-reducing road surface material for urban roads includes the following steps:

[0033] Step 1, preparation and treatment of materials;

[0034] Step 2, mixture design;

[0035] Step 3, mixing operation;

[0036] Step 4, paving the road surface;

[0037] Step 5, compaction and forming;

[0038] Step 6, curing treatment.

[0039] In one embodiment, in step one, prepare the materials required for manufacturing the noise-reducing road surface body 1. Select graded crushed stone as the main aggregate for the drainage base course 11, with a particle size range between 5 mm and 30 mm. Select natural sand as the auxiliary aggregate, with a particle size between 0.3 mm and 5 mm. Select lignin fiber or polyester fiber as the fiber material. The load-bearing base course 12 is usually made of ordinary Portland cement, and crushed stone with a particle size of 5 - 30 mm is selected. Select lime as the additive. The bonding layer 13 is made of modified emulsified asphalt, which consists of matrix asphalt, emulsifier, and water. The wearing course 14 uses modified asphalt as the binder. The modified asphalt is SBS modified asphalt, with a penetration between 40 - 60 (0.1 mm), a softening point greater than 80 °C, and an elongation greater than 20 cm. The material for the noise-reducing aggregate layer 15 is rubber particles, with a particle size between 2 - 6 mm. All the materials for the noise-reducing road surface body 1 need to be cleaned and screened. After cleaning, the aggregates are screened according to the required particle size range of the design to remove impurities such as soil and dust on the surface, improving the adhesion between materials.

[0040] In one embodiment, in step two, based on the environment where the noise-reducing road surface body 1 is located and the traffic flow conditions, clarify the required noise reduction effect. Consider the type of traffic load and the magnitude of traffic volume that the road is expected to bear, and determine the compressive strength and shear strength bearing capacity indicators that the road surface materials should possess, ensuring that the road surface can stably bear vehicle loads without structural damage within the designed service life. Combine the local climate conditions and the expected service life of the road to set the durability requirements for the mixture. According to the characteristics of the raw materials and the design objectives, preliminarily formulate the mix ratios of the aggregates, bonding materials, and added additives, prepare specimens, and conduct various performance tests on the mixture according to the standards. After multiple performance tests and mix ratio adjustments, when all the performance indicators of the mixture meet the design objectives, the final mix ratio can be determined.

[0041] In one embodiment, in step three, first put the preheated coarse aggregates into the mixer. The coarse aggregates should be selected according to the required particle size range and gradation of the design. Then add the fine aggregates according to the design ratio. The fine aggregates are used to fill the voids between the coarse aggregates and, together with the coarse aggregates, form the aggregate system of the mixture. Then add the preheated asphalt. The asphalt serves as the bonding material to bond the aggregates together. Finally, add the additives to ensure their uniform dispersion in the mixture.

[0042] In one embodiment, in step four, before paving the road surface materials, conduct a comprehensive inspection of the base course to check whether the flatness, compaction degree, and strength indicators of the base course meet the design requirements. For the asphalt mixture, take covering measures to prevent excessive heat dissipation according to the construction progress arrangement. Then confirm the paving thickness, width, and speed, and lay the drainage base course 11, load-bearing base course 12, bonding layer 13, wearing course 14, and noise-reducing aggregate layer 15 in sequence.

[0043] In one embodiment, in step five, initial compaction should be carried out immediately after paving, with the rolling speed between 1.5 - 2.5 m / s. After initial compaction, double compaction is carried out, with the rolling speed between 3 - 4 m / s. After double compaction, final compaction is carried out, with the rolling speed between 2 - 3 m / s.

[0044] In one embodiment, in step six, after compaction is completed, curing is required. The curing methods are natural curing and curing by spraying a curing agent. The natural curing material gradually cools and solidifies in the natural environment, and the curing time is 1 - 2 days. Curing by spraying a curing agent means immediately spraying the curing agent on the road surface.

[0045] When the present invention is in operation: Prepare the materials required for the preparation of the noise-reducing road surface main body 1. The materials of the noise-reducing road surface main body 1 all need to be cleaned and screened. The washed aggregates are screened according to the particle size range required by the design. According to the characteristics of the raw materials and the design objectives, the mix ratios of the aggregates, the bonding material, and the added additives are initially determined, and specimens are prepared. Various performance tests are carried out on the mixture according to the standards. After multiple performance tests and mix ratio adjustments, when all the performance indicators of the mixture meet the design objectives, the final mix ratio can be determined. Put the preheated coarse aggregates into the mixer. The coarse aggregates should be selected according to the particle size range and gradation required by the design. Then add the fine aggregates according to the design ratio. The fine aggregates are used to fill the voids between the coarse aggregates and together with the coarse aggregates form the aggregate system of the mixture. Then add the preheated asphalt. The asphalt acts as a bonding material to bond the aggregates together. Finally, add the additives to ensure their uniform dispersion in the mixture. Arrange the mixed materials according to the construction progress. For the asphalt mixture, take covering measures to prevent excessive heat dissipation. Then confirm the paving thickness, width, and speed, and lay the drainage base layer 11, the load-bearing base layer 12, the bonding layer 13, the wearing layer 14, and the noise-reducing aggregate layer 15 in sequence. Initial compaction should be carried out immediately after paving, with the rolling speed between 1.5 - 2.5 m / s. After initial compaction, double compaction is carried out, with the rolling speed between 3 - 4 m / s. After double compaction, final compaction is carried out, with the rolling speed between 2 - 3 m / s. After compaction is completed, cure the materials.

[0046] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A multifunctional environmental protection and noise reduction road surface material for urban roads, characterized in that: It includes a noise-reducing road surface main body (1), and the noise-reducing road surface main body (1) includes a drainage base course (11), a load-bearing base course (12), a bonding layer (13), a wearing course (14) and a noise-reducing aggregate layer (15); The load-bearing base course (12) is laid on the top of the drainage base course (11), the bonding layer (13) is bonded to the top of the load-bearing base course (12), the wearing course (14) is bonded to the top of the bonding layer (13), and the noise-reducing aggregate layer (15) is laid on the top of the wearing course (14).

2. A preparation method of a multifunctional environmental protection and noise reduction road surface material for urban roads, which is used in conjunction with a multifunctional environmental protection and noise reduction road surface material for urban roads as described in any one of claims 1, and is characterized in that: It includes the following steps: Step 1: Preparation and treatment of materials; Step 2: Mixture design; Step 3: Mixing operation; Step 4: Paving the road surface; Step 5: Compaction and shaping; Step 6: Maintenance treatment.

3. The preparation method of a multifunctional environmental protection noise reduction road surface material for urban roads according to claim 2, characterized in that: In the said Step 1, prepare the materials required for preparing the noise-reducing road surface main body (1). Select graded gravel as the main aggregate of the drainage base course (11), with the particle size range between 5 mm and 30 mm. Select natural sand as the auxiliary aggregate, with the particle size between 0.3 mm and 5 mm. Select lignin fiber or polyester fiber as the fiber material. The load-bearing base course (12) usually selects ordinary Portland cement, selects gravel with a particle size of 5 - 30 mm, and selects lime as the additive. The bonding layer (13) selects modified emulsified asphalt, which is composed of matrix asphalt, emulsifier and water. The wearing course (14) uses modified asphalt as the binder, and the modified asphalt is SBS modified asphalt, with the penetration between 40 - 60 (0.1 mm), the softening point greater than 80 °C, and the ductility greater than 20 cm. The material of the noise-reducing aggregate layer (15) selects rubber particles, with the particle size of the rubber particles between 2 - 6 mm. The materials of the noise-reducing road surface main body (1) all need to be cleaned and screened, and the cleaned aggregates are screened according to the particle size range required by the design.

4. The preparation method of a multifunctional environmental protection noise reduction road surface material for urban roads according to claim 2, characterized in that: In the said Step 2, according to the environment where the noise-reducing road surface main body (1) is located and the traffic flow situation, clarify the required noise reduction effect. Consider the type of traffic load and the magnitude of traffic volume that the road is expected to bear, determine the compressive strength and shear strength bearing capacity indicators that the road surface material should possess, ensure that the road surface can stably bear the vehicle load within the design service life without structural damage. Combine the local climate conditions and the expected service life of the road, set the durability requirements of the mixture. According to the raw material characteristics and design objectives, preliminarily draw up the mix ratio of aggregates, bonding materials and added additives, prepare specimens, and conduct various performance tests on the mixture according to the standards. After multiple performance tests and mix ratio adjustments, when all the performance indicators of the mixture meet the design objectives, the final mix ratio can be determined.

5. The preparation method of a multifunctional environmental protection and noise reduction road surface material for urban roads according to claim 2, characterized in that: In the said Step 3, first put the preheated coarse aggregates into the mixer. The coarse aggregates should be selected according to the particle size range and gradation required by the design. Then add fine aggregates according to the design ratio. The fine aggregates are used to fill the voids between the coarse aggregates and jointly form the aggregate system of the mixture. Then add the preheated asphalt. The asphalt acts as a bonding material to bond the aggregates together. Finally, add additives to ensure their uniform dispersion in the mixture.

6. The preparation method of a multifunctional environmental protection noise reduction road surface material for urban roads according to claim 2, characterized in that: In the fourth step, before paving the road surface material, a comprehensive inspection of the base course is carried out to check whether the flatness, compaction degree and strength index of the base course meet the design requirements. For the asphalt mixture, according to the construction progress arrangement, covering measures are taken to prevent the heat from dissipating too quickly, and then the paving thickness, width and speed are confirmed, and the drainage base course (11), the load-bearing base course (12), the bonding layer (13), the wearing course (14) and the noise-reducing aggregate layer (15) are laid in sequence.

7. The preparation method of a multifunctional environmental protection and noise reduction road surface material for urban roads according to claim 2, wherein: In the fifth step, initial compaction shall be carried out immediately after paving, with the rolling speed between 1.5 - 2.5 m / s. After the initial compaction is completed, double compaction is carried out, with the rolling speed between 3 - 4 m / s. After the double compaction is completed, final compaction is carried out, with the rolling speed between 2 - 3 m / s.

8. The preparation method of a multifunctional environmental protection noise reduction pavement material for urban roads according to claim 2, characterized in that: In the sixth step, after the compaction is completed, curing is required. The curing methods are natural curing and curing by spraying curing agent. The natural curing material gradually cools and solidifies in the natural environment, and the curing time is 1 - 2 days. Curing by spraying curing agent means spraying the curing agent on the road surface immediately.

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