Pavement structure containing CNTs reinforced modified asphalt pervious concrete
By introducing CNTs to reinforce the modified asphalt permeable concrete layer and reinforcing mesh into the asphalt pavement, combined with a drainage system, the problem of poor permeability of traditional asphalt pavement has been solved, achieving efficient drainage and structural reinforcement, extending the service life of the pavement, and promoting the construction of sponge cities.
Patent Information
- Application Number
- CN202422712939.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-07
AI Technical Summary
Traditional asphalt pavements have poor permeability and are prone to slippage or cracking under heavy traffic and rainwater immersion, leading to structural damage, affecting service life and urban ecological balance.
A CNT-reinforced modified asphalt permeable concrete layer is installed inside the asphalt pavement, combined with a reinforcing mesh and a graded crushed stone layer, to form a pavement structure with high porosity and strong interfacial bonding, and rapid drainage is achieved through water pipes and drainage channels.
It improves the permeability and structural performance of the road surface, enhances its resistance to rutting, extends its service life, promotes the construction of sponge cities, and improves the urban ecological environment.
Smart Images
Figure CN223535539U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of road pavement structure technology, and in particular to a pavement structure containing CNTs-reinforced modified asphalt permeable concrete. Background Technology
[0002] Currently, with the deepening of urban construction, the optimization and upgrading of road traffic is gradually unfolding, and pavement structure technology is ushering in more improvements and innovations. Asphalt pavement is an important component in urban road construction. The pavement structure formed by its overlay has strong overall structural performance, good stability, and good driving comfort. With the introduction of sustainable development and the concept of sponge cities, traditional pavement structures suffer from poor permeability under the combined effects of traffic loads and environmental factors. Since my country's highway pavements are mainly composed of impermeable asphalt mixtures and concrete, this dense surface pavement has poor drainage performance. Under the combined effects of water immersion and erosion and traffic loads, it is prone to cracking of the original pavement, leading to further damage and reducing the service life of the asphalt pavement. In addition, the reduced rainwater infiltration also affects the urban ecological balance.
[0003] Setting permeable layers in asphalt pavement structures is a common preventative measure. These layers can bond with the subbase and upper asphalt layers to form a unified structure, improving the drainage of surface water and possessing a certain degree of permeability. However, this type of permeable layer is prone to slippage or cracking under heavy traffic, especially on roads with high traffic volume after operation. Its permeability decreases significantly, and it cannot effectively allow water from the pavement to seep into the water storage structure. Repeated rainwater soaking can weaken the permeability of the pavement structure, which can easily lead to structural damage to the asphalt pavement.
[0004] Therefore, in order to extend the service life and functionality of asphalt permeable concrete pavement structures and effectively reduce pavement distress and water damage, it is urgent to develop an asphalt permeable concrete pavement structure with high strength and high permeability. Utility Model Content
[0005] The purpose of this invention is to provide a pavement structure containing CNTs-reinforced modified permeable asphalt concrete. By setting a CNTs-reinforced modified permeable asphalt concrete layer inside the asphalt pavement, it features high porosity, strong interfacial adhesion, good rutting resistance, and significant permeability, enabling the asphalt pavement to maintain high permeability over a long period and improving the overall structural performance and economic benefits of the pavement. Furthermore, it is of great significance for promoting the green ecological construction of sponge cities, effectively solving the problems of insufficient permeability and structural performance mentioned in the background art.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A pavement structure containing CNTs-reinforced modified asphalt permeable concrete includes drainage channels on both sides and a soil layer, a graded crushed stone layer, a CNTs-reinforced modified asphalt permeable concrete layer, and a fine-grained asphalt surface layer arranged sequentially from bottom to top between the two drainage channels. A reinforcing mesh is laid between the CNTs-reinforced modified asphalt permeable concrete layer and the graded crushed stone layer. A water-conducting pipe with permeable holes on its surface is provided between the soil layer and the graded crushed stone layer. The two ends of the water-conducting pipe are respectively connected to the drainage channels on both sides.
[0008] Furthermore, the water pipes are horizontally distributed.
[0009] Furthermore, the water pipe is covered and wrapped by a graded crushed stone layer on top and a plain soil layer on the bottom, and the water outlet at the end of the water pipe is fixedly connected to the support baffle of the drainage channel.
[0010] Furthermore, the fine-grained asphalt surface layer is the first surface layer of the road surface prepared and paved with modified emulsified asphalt mixture, and the gradation type is AC-13.
[0011] Furthermore, the CNTs-reinforced modified asphalt permeable concrete layer has a permeability coefficient ≥0.38cm / s, a porosity ≥19%, and a rutting dynamic stability ≥4000 times / mm.
[0012] Furthermore, the CNT content in the CNT-reinforced modified asphalt permeable concrete layer is set to 0.2% to 0.8%.
[0013] Furthermore, the reinforcing mesh is a fiber mesh or metal mesh formed by interwoven meshes.
[0014] Furthermore, the graded crushed stone layer is a coarse-grained granite crushed stone layer with a particle size range of 15mm to 30mm.
[0015] Furthermore, the subgrade layer is a natural sandy soil layer with a certain viscosity and a density of ≥95%.
[0016] Furthermore, the thickness of the fine-grained asphalt surface layer is 4mm to 8mm, the thickness of the CNTs-reinforced modified asphalt permeable concrete layer is 60mm to 120mm, the thickness of the graded crushed stone layer is 100mm to 220mm, and the thickness of the subgrade layer is 180mm to 280mm.
[0017] Compared with the prior art, this utility model provides a pavement structure of CNT-reinforced modified asphalt permeable concrete, which has the following beneficial effects:
[0018] (1) This utility model uses the reinforcing mesh and the CNTs-reinforced modified asphalt permeable concrete layer to play a role in permeation and filtration. The surface water of the fine-grained asphalt surface layer permeates into the CNTs-reinforced modified asphalt permeable concrete layer, and then flows through the reinforcing mesh and the graded crushed stone layer to the underground water pipe. The water is discharged into the drainage troughs on both sides through the outlet of the water pipe.
[0019] (2) Compared with the traditional permeable asphalt pavement structure, this utility model incorporates a CNT-reinforced modified permeable asphalt concrete layer in the pavement. This composite material layer not only enhances the pavement's resistance to rutting and its load-bearing capacity but also improves its structural durability and high-temperature stability. Furthermore, CNTs further enhance the overall flexural stiffness modulus of asphalt, significantly improving the crack resistance and deformation capacity of the pavement drainage structure.
[0020] (3) The pavement structure proposed in this utility model has the characteristics of short on-site construction period, simple construction process, and high economic and ecological benefits, which is conducive to promoting the further development of research on asphalt permeable concrete pavement structure. At the same time, this new pavement structure can achieve the purpose of effective drainage, enabling urban roads to better adapt to environmental changes and cope with natural disasters caused by rainwater, and has a good effect on improving the mitigation of urban heat island effect and maintaining ecological balance, thus accelerating the construction of sponge cities.
[0021] (4) The CNTs-reinforced modified permeable asphalt concrete used in this invention can further improve the structural performance of the permeable layer, better optimize the pore structure of the permeable asphalt, and enhance its internal particle interface bonding system. The combination of the CNTs-reinforced modified permeable asphalt concrete layer, the reinforcing mesh, and the graded crushed stone layer is conducive to improving permeability while reducing pore blockage, thus achieving long-term maintenance of good structural performance and high permeability of asphalt pavement. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure of this utility model;
[0024] Figure 2 for Figure 1 A schematic diagram of the local structure at point A in the middle.
[0025] Reference numerals in the attached diagram: 1. Subgrade layer; 2. Drainage pipe; 3. Graded crushed stone layer; 4. Reinforcing mesh; 5. CNTs-reinforced modified asphalt permeable concrete layer; 6. Fine-grained asphalt surface layer; 7. Outlet; 8. Drainage channel; 9. Support baffle. Detailed Implementation
[0026] The technical solution of this utility model will be clearly and completely described below through detailed embodiments and in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0027] Example 1
[0028] Please refer to Figure 1 and Figure 2 This embodiment provides a pavement structure containing CNTs-reinforced modified permeable asphalt concrete, including drainage channels 8 on both sides and a subgrade layer 1, a graded crushed stone layer 3, a CNTs-reinforced modified permeable asphalt concrete layer 5, and a fine-grained asphalt surface layer 6 distributed sequentially from bottom to top between the two drainage channels 8. A reinforcing mesh 4 is laid between the CNTs-reinforced modified asphalt permeable concrete layer 5 and the graded crushed stone layer 3. A water-conducting pipe 2 with permeable holes on its surface is provided between the subgrade layer 1 and the graded crushed stone layer 3, and both ends of the water-conducting pipe 2 are connected to the drainage channels 8 on both sides. Through the combined action of the reinforcing mesh 4 and the CNTs-reinforced modified asphalt permeable concrete layer 5, water flowing from the surface of the fine-grained asphalt surface layer 6 permeates into the CNTs-reinforced modified asphalt permeable concrete layer 5, and then flows through the reinforcing mesh 4 and the graded crushed stone layer 3 to the underground water-conducting pipe 2. The water then flows through the outlet 7 of the water-conducting pipe 2 into the drainage channels 8 on both sides, thereby achieving rapid infiltration and drainage of surface water on the road.
[0029] In some specific embodiments, the water pipe 2 is covered and wrapped by the graded crushed stone layer 3 above and the plain soil layer 1 below, and the water outlet 7 at the end of the water pipe 2 is fixedly connected to the support baffle 9 of the drainage trough 8.
[0030] In a preferred embodiment, the water pipes 2 are horizontally distributed, which facilitates the rapid discharge of seepage water into the drainage channels on both sides.
[0031] In some specific implementations, the fine-grained asphalt surface layer 6 is the first surface layer of the road surface prepared and paved with modified emulsified asphalt mixture, with a gradation type of AC-13 and a thickness of 6mm.
[0032] In some specific implementations, the CNTs-reinforced modified asphalt permeable concrete layer 5 is a highly permeable composite material layer with a permeability coefficient of 0.39 cm / s, a porosity of 19.85%, a rutting dynamic stability of 4908 times / mm, a CNTs dosage of 0.7%, and a thickness of 90 mm.
[0033] In some specific embodiments, the reinforcing mesh 4 is a fiber mesh or metal mesh formed by interwoven meshes.
[0034] In some specific implementations, the graded crushed stone layer 3 is a coarse-grained granite crushed stone layer with a particle size range of 15mm to 30mm and a thickness of 170mm.
[0035] In some specific implementations, the subgrade layer 1 is a natural sandy soil layer with a certain viscosity, a density of 95.4%, and a thickness of 220 mm.
[0036] Example 2
[0037] Please refer to Figure 1 and Figure 2 This embodiment provides a pavement structure containing CNTs-reinforced modified asphalt permeable concrete, which differs from Embodiment 1 in that: (1) the permeability coefficient of the CNTs-reinforced modified asphalt permeable concrete layer 5 is 0.44 cm / s, the porosity is 21.20%, the rutting dynamic stability is 4166 times / mm, the CNTs content is set to 0.5%, and the thickness is 80 mm. (2) The thickness of the graded crushed stone layer 3 is 180 mm. The other settings of Embodiment 2 are the same as those in Embodiment 1, so they will not be repeated.
[0038] Tests have shown that this invention effectively improves the permeability and structural performance of asphalt pavement by incorporating a CNT-reinforced modified asphalt permeable concrete layer. Therefore, the pavement structure containing CNT-reinforced modified asphalt permeable concrete provided by this invention demonstrates high feasibility and innovation, and has significant potential for widespread application.
[0039] The above embodiments are merely illustrative of the concept and technical solution of this utility model, and are not intended to limit this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A pavement structure containing CNTs-reinforced modified asphalt permeable concrete, characterized in that, It includes drainage channels on both sides and, between the two drainage channels, a soil layer, a graded crushed stone layer, a CNTs-reinforced modified asphalt permeable concrete layer, and a fine-grained asphalt surface layer distributed from bottom to top. A reinforcing mesh is laid between the CNTs-reinforced modified asphalt permeable concrete layer and the graded crushed stone layer. A water-conducting pipe with permeable holes on its surface is provided between the soil layer and the graded crushed stone layer. The two ends of the water-conducting pipe are respectively connected to the drainage channels on both sides.
2. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 1, characterized in that, The water pipes are horizontally distributed.
3. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 2, characterized in that, The water pipe is covered and wrapped by a graded crushed stone layer on top and a plain soil layer on the bottom, and the water outlet at the end of the water pipe is fixedly connected to the support baffle of the drainage channel.
4. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 1, characterized in that, The fine-grained asphalt surface layer is the first surface layer of the road surface, which is prepared and paved with modified emulsified asphalt mixture, and the gradation type is AC-13.
5. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 1, characterized in that, The CNTs-reinforced modified asphalt permeable concrete layer has a permeability coefficient ≥0.38cm / s, a porosity ≥19%, and a rutting dynamic stability ≥4000 times / mm.
6. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 1, characterized in that, The reinforcing mesh is a fiber mesh or metal mesh formed by interwoven meshes.
7. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 1, characterized in that, The graded crushed stone layer is a coarse-grained granite crushed stone layer with a particle size range of 15mm to 30mm.
8. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to claim 1, characterized in that, The subgrade layer is a natural sandy soil layer with a density of ≥95%.
9. The pavement structure of CNT-reinforced modified asphalt permeable concrete according to any one of claims 1 to 8, characterized in that, The thickness of the fine-grained asphalt surface layer is 4mm to 8mm, the thickness of the CNTs-reinforced modified asphalt permeable concrete layer is 60mm to 120mm, the thickness of the graded crushed stone layer is 100mm to 220mm, and the thickness of the subgrade layer is 180mm to 280mm.