New pavement structure based on high-load-bearing flexible recycled asphalt pavement

Abstract

The application relates to the technical field of asphalt pavement, and discloses a novel pavement structure based on high-bearing flexible regenerated asphalt pavement, which comprises a tamped bottom layer, the top of the tamped bottom layer is provided with a gravel layer, the top of the gravel layer is provided with a regenerated asphalt layer, and the top of the regenerated asphalt layer is provided with an asphalt surface layer. The novel pavement structure based on the high-bearing flexible regenerated asphalt pavement has the advantages that the tamped bottom layer ensures good compaction effect and stability, the bearing capacity of the pavement bottom is increased in cooperation with the gravel layer, under the action of vehicle load, impact energy is first absorbed by the asphalt surface layer, load stress is dispersed through elastic deformation, the regenerated asphalt layer of the middle layer further disperses the load through the synergistic effect of the tamped bottom layer and the gravel layer, stress concentration is prevented, the waterproof layer can be used for preventing water penetration, the tamped bottom layer provides overall support through its rigidity and stability, and the long-term stability of the pavement is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt pavement technology, and in particular relates to a novel pavement structure based on high load-bearing flexible recycled asphalt pavement. Background Technology

[0002] Asphalt pavement refers to various types of pavement constructed by mixing road asphalt materials into mineral materials. Asphalt, as a binder, can improve the compressive strength and durability of mineral materials, making the pavement smoother, impermeable, and durable. In recent years, with the acceleration of urbanization and the increase in transportation demand, the load-bearing capacity and durability of traditional asphalt pavement have become increasingly prominent issues.

[0003] An existing patent (publication number: CN214737096U) discloses an energy-saving and environmentally friendly hot-recycled asphalt pavement, including a base course. A crushed stone layer is fixedly connected to the upper surface of the base course. A connecting layer is fixedly connected to the side of the crushed stone layer away from the base course. A first drainage layer is fixedly connected to the side of the connecting layer away from the crushed stone layer. A reinforcing layer is fixedly connected to the side of the first drainage layer away from the connecting layer. The advantage of this invention is that the energy-saving and environmentally friendly hot-recycled asphalt pavement has an internal structure consisting of a crushed stone layer made from a mixture of plant-mixed hot-recycled asphalt and crushed stone, and an asphalt pavement layer made from fine-grained plant-mixed hot-recycled asphalt mixture.

[0004] Existing asphalt pavements are prone to cracking, rutting, and localized collapse under long-term high loads, seriously affecting road service life and driving safety. Although recycled asphalt pavement technology has been applied in some road projects, its load-bearing capacity and fatigue resistance still have significant room for improvement. Therefore, a novel pavement structure based on high-load-bearing flexible recycled asphalt pavement is proposed to address these issues. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a novel pavement structure based on high-load-bearing flexible recycled asphalt pavement. This structure has advantages such as dispersing load stress through its own elastic deformation, resulting in a better high load-bearing capacity. It solves the problems mentioned in the aforementioned comparative documents, such as the tendency of existing asphalt pavements to develop cracks, ruts, and local collapses under long-term high loads, which seriously affect the service life of roads and driving safety.

[0006] To achieve the above objectives, this application provides the following technical solution: a novel pavement structure based on high load-bearing flexible recycled asphalt pavement, comprising a compacted base layer, a crushed stone layer on top of the compacted base layer, a recycled asphalt layer on top of the crushed stone layer, an asphalt surface layer on top of the recycled asphalt layer, and a waterproof layer between the recycled asphalt layer and the asphalt surface layer.

[0007] The above scheme ensures good compaction and stability through the compacted base layer, while the crushed stone layer increases the load-bearing capacity of the roadbed. Under vehicle loads, the asphalt surface layer first absorbs the impact energy and disperses the load stress through elastic deformation. The recycled asphalt mixture in the intermediate layer further disperses the load and prevents stress concentration through its synergistic effect with the compacted base layer and the crushed stone layer. The waterproof layer can be used to prevent water penetration. The compacted base layer provides overall support through its own rigidity and stability, ensuring the long-term stability of the road surface.

[0008] Furthermore, the compacted base layer includes a compacted plain soil layer, and a bottom crushed stone layer is provided on top of the compacted plain soil layer. The bottom crushed stone layer is 150mm graded crushed stone.

[0009] The above scheme, in combination with the compacted soil layer and the graded crushed stone base layer, can provide a stable subbase support effect, enhancing the overall stability and bearing capacity of the road surface.

[0010] Furthermore, the crushed stone layer is a cement-stabilized crushed stone layer, and a lime-stabilized soil layer is provided between the crushed stone layer and the bottom crushed stone layer.

[0011] The above scheme combines a crushed stone layer and a lime-stabilized soil layer into an upper base course and a lower base course, with a total thickness of 36cm, which further enhances the bearing capacity of the road surface.

[0012] Furthermore, a geogrid is provided between the crushed stone layer and the recycled asphalt layer.

[0013] The above scheme uses geogrids between the crushed stone layer and the recycled asphalt layer to enhance interlayer bonding and shear resistance, thereby increasing the overall stress bearing capacity of the intermediate layer of the asphalt surface layer.

[0014] Furthermore, the asphalt surface layer is laid with a highly elastic modified asphalt mixture.

[0015] The above scheme utilizes highly elastic modified asphalt mixtures in the asphalt surface layer to absorb impact energy on the road surface and disperse load stress through its own elastic deformation, thereby achieving a better high load-bearing capacity.

[0016] Furthermore, an asphalt adhesive layer is fixedly connected between the waterproof layer and the asphalt surface layer.

[0017] The above scheme increases the bonding strength and stability with the asphalt surface layer by setting an asphalt bonding layer, giving it a more stable anti-cracking and durable effect.

[0018] Furthermore, the thickness of the compacted soil layer is 20cm.

[0019] The above scheme provides a stable base support at the bottom through a 20cm thick compacted soil layer, resulting in good load-bearing stability at the bottom of the asphalt pavement.

[0020] Furthermore, the waterproof layer is a modified bitumen waterproof material.

[0021] The above-mentioned solution improves the performance of asphalt by adding polymer materials to the waterproof layer modified asphalt waterproof coating. Among them, SBS modified asphalt improves the elasticity and low-temperature crack resistance of asphalt and can prevent water penetration.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] 1. This novel pavement structure based on high-load-bearing flexible recycled asphalt pavement ensures good compaction and stability through the setting of an over-compacted subbase. Combined with a crushed stone layer, it increases the load-bearing capacity of the pavement bottom. Under vehicle load, the asphalt surface layer first absorbs the impact energy and disperses the load stress through elastic deformation. The recycled asphalt mixture in the middle layer further disperses the load and prevents stress concentration through the synergistic effect with the over-compacted subbase and crushed stone layer. The waterproof layer can be used to prevent water penetration. The over-compacted subbase provides overall support through its own rigidity and stability, ensuring the long-term stability of the pavement.

[0024] 2. This novel pavement structure based on high-load-bearing flexible recycled asphalt pavement uses a waterproof layer modified asphalt waterproof coating to improve the performance of asphalt by adding polymer materials. Among them, SBS modified asphalt improves the elasticity and low-temperature crack resistance of asphalt and can prevent water penetration. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the compacted soil layer of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the waterproof layer of this utility model after an explosion;

[0028] Figure 4 This is a partial cross-sectional view of the waterproof layer of this utility model.

[0029] Figure 5 This is a schematic diagram of the structure of lime-stabilized soil explosion according to this utility model.

[0030] The markings in the diagram are as follows: 1. Compacted base layer; 2. Crushed stone layer; 3. Recycled asphalt layer; 4. Asphalt surface layer; 5. Waterproof layer; 101. Compacted subgrade layer; 102. Subgrade crushed stone layer; 6. Lime-stabilized soil layer; 7. Geogrid; 8. Asphalt bonding layer. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figure 1 , Figure 2 and Figure 3 This embodiment presents a novel pavement structure based on high-load-bearing flexible recycled asphalt pavement. The structure includes a compacted base layer 1, a crushed stone layer 2 on top of the compacted base layer 1, a recycled asphalt layer 3 on top of the crushed stone layer 2, an asphalt surface layer 4 on top of the recycled asphalt layer 3, and a waterproof layer 5 between the recycled asphalt layer 3 and the asphalt surface layer 4. The compacted base layer 1 ensures good compaction and stability, and, in conjunction with the crushed stone layer 2, increases the load-bearing capacity of the pavement bottom. Under vehicle loads, the asphalt surface layer first absorbs impact energy and disperses load stress through elastic deformation. The recycled asphalt layer 3 mixture in the middle layer further disperses the load and prevents stress concentration through synergistic action with the compacted base layer 1 and the crushed stone layer 2. The waterproof layer 5 prevents water penetration. The compacted base layer 1 provides overall support through its own rigidity and stability, ensuring the long-term stability of the pavement.

[0033] Please see Figure 1 , Figure 2 and Figure 5 The compacted base layer 1 includes a compacted soil layer 101, and a bottom crushed stone layer 102 is set on top of the compacted soil layer 101. The bottom crushed stone layer 102 is 150mm graded crushed stone. The compacted soil layer 101 and the bottom crushed stone layer 102 can provide a stable subbase support effect and enhance the overall stability and bearing capacity of the road surface.

[0034] Please see Figure 1 and Figure 3 A geogrid 7 is installed between the crushed stone layer 2 and the recycled asphalt layer 3. By installing the geogrid 7 between the crushed stone layer 2 and the recycled asphalt layer 3, the interlayer bonding force and shear resistance are enhanced, thereby increasing the overall stress bearing capacity of the intermediate layer of the asphalt surface layer 4.

[0035] Please see Figure 2 and Figure 3An asphalt bonding layer 8 is fixedly connected between the waterproof layer 5 and the asphalt surface layer 4. The waterproof layer 5 is a modified asphalt waterproof material. The asphalt bonding layer 8 can increase the bonding strength and stability with the asphalt surface layer 4, giving it a more stable anti-cracking and durable effect. The modified asphalt waterproof coating of the waterproof layer 5 improves the performance of asphalt by adding polymer materials. Among them, SBS modified asphalt improves the elasticity and low-temperature crack resistance of asphalt and can prevent water penetration.

[0036] In this embodiment, a novel pavement structure based on high-load-bearing flexible recycled asphalt pavement is presented. The compacted soil layer 101 and the graded crushed stone base layer 102 provide a stable subbase support effect, enhancing the overall stability and load-bearing capacity of the pavement. The crushed stone layer 2 and the lime-stabilized soil layer 6 further enhance the load-bearing capacity of the pavement. By setting a geogrid 7 between the crushed stone layer 2 and the recycled asphalt layer 3, the interlayer bonding force and shear resistance are enhanced, thereby increasing the overall stress resistance of the intermediate layer of the asphalt surface layer 4. The asphalt bonding layer 8 increases the bonding strength and stability with the asphalt surface layer 4, giving it a relatively stable anti-cracking and durable effect. The waterproof layer 5, a modified asphalt waterproof coating, improves the performance of asphalt by adding polymer materials. Among them, SBS modified asphalt improves the elasticity and low-temperature crack resistance of the asphalt and prevents water penetration. The high-elasticity modified asphalt mixture of the asphalt surface layer 4 can absorb impact energy on the pavement and disperse load stress through its own elastic deformation, achieving a good high load-bearing effect.

[0037] It should be noted that...

[0038] The working principle of the above embodiments is as follows:

[0039] The compacted base layer 1 is divided into a compacted soil layer 101 and a bottom crushed stone layer 102 to build a compacted and stable subgrade at the bottom of the asphalt pavement. A lime-stabilized soil layer 6 is added between the graded crushed stone layer 2 and the bottom crushed stone layer 102. The graded crushed stone further enhances the stability of the base support through its own rigidity and stability. A geogrid 7 is placed between the crushed stone layer 2 and the recycled asphalt layer 3 to provide strong adhesion. A waterproof layer 5 is set between the recycled asphalt layers 3. The recycled asphalt layer is a recycled material asphalt mixture. Together with the asphalt bonding layer 8, it enhances the bonding strength between the pavement structural layers and also has a waterproof function. The asphalt surface layer 4 is laid by a high-elasticity modified asphalt mixture, so that the asphalt pavement can disperse the load stress through elastic deformation.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application.

Claims

1. A novel pavement structure based on high-load-bearing flexible recycled asphalt pavement, comprising a compacted subbase (1), characterized in that: The compacted base layer (1) is topped with a crushed stone layer (2), the crushed stone layer (2) is topped with a recycled asphalt layer (3), the recycled asphalt layer (3) is topped with an asphalt surface layer (4), and a waterproof layer (5) is provided between the recycled asphalt layer (3) and the asphalt surface layer (4).

2. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 1, characterized in that: The compacted base layer (1) includes a compacted soil layer (101), and a bottom crushed stone layer (102) is provided on top of the compacted soil layer (101). The bottom crushed stone layer (102) is 150mm graded crushed stone.

3. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 1, characterized in that: The crushed stone layer (2) is a cement-stabilized crushed stone layer, and a lime-stabilized soil layer (6) is provided between the crushed stone layer (2) and the bottom crushed stone layer (102).

4. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 1, characterized in that: A geogrid (7) is provided between the crushed stone layer (2) and the recycled asphalt layer (3).

5. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 1, characterized in that: The asphalt surface layer (4) is laid with a highly elastic modified asphalt mixture.

6. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 1, characterized in that: An asphalt bonding layer (8) is fixedly connected between the waterproof layer (5) and the asphalt surface layer (4).

7. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 2, characterized in that: The thickness of the compacted soil layer (101) is 20cm.

8. The novel pavement structure based on high-load-bearing flexible recycled asphalt pavement according to claim 1, characterized in that: The waterproof layer (5) is a modified bitumen waterproof material.

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