Semi-flexible pavement structure

Abstract

The utility model discloses a semi-flexible pavement structure which comprises a semi-flexible pavement main body, the semi-flexible pavement main body comprises a semi-flexible surface layer, an anti-settling layer and a foundation layer which are sequentially laid from top to bottom, and the semi-flexible surface layer comprises an asphalt concrete base body and modified cement grouting materials poured in the asphalt concrete base body. The upper surface of the asphalt concrete base body is further coated with an outer protection layer. And a reinforcing piece embedded into the anti-settling layer and the asphalt concrete matrix is also arranged between the anti-settling layer and the asphalt concrete matrix. According to the utility model, the interface agents are arranged among the layers, and meanwhile, the honeycomb-shaped reinforcing pieces are designed between the semi-flexible surface layer and the anti-settling layer, so that the contact area between the semi-flexible surface layer and the anti-settling layer can be increased, the firmness between the semi-flexible surface layer and the anti-settling layer can be improved, the problem of interlayer stripping is not easy to occur, and the service life of the semi-flexible surface layer and the anti-settling layer is prolonged. In addition, the honeycomb structure can also realize light weight and high rigidity, the strength of the semi-flexible pavement main body can also be improved, and the problem of ruts is not easy to occur.

Description

Technical Field

[0001] This utility model belongs to the field of road pavement technology, specifically a semi-flexible pavement structure. Background Technology

[0002] Semi-flexible asphalt pavement is a new type of pavement structure that combines the advantages of asphalt pavement and cement concrete pavement, exhibiting good high-temperature stability, water stability, fatigue resistance, and rutting resistance. This pavement material typically consists of a high-void matrix asphalt mixture (void ratio of approximately 20%-28%) and a special cement-based mortar infused within it, possessing both the flexibility of asphalt pavement and the rigidity of cement pavement.

[0003] For example, CN214694958U discloses a semi-flexible pavement structure, comprising, from top to bottom, an SFP-13 layer, a first tack coat, an AC-20C layer, a second tack coat, and a base course. The SFP-13 layer is 8 cm thick. The AC-20C layer is 8 cm thick. This utility model uses a semi-flexible pavement material as the surface layer, which can effectively reduce rutting, swelling, and other defects caused by insufficient high-temperature stability of the mixture. In actual construction, the pavement is generally constructed from bottom to top according to the layer structure. Due to the layered construction, it is easy for the layers to not be firmly and tightly bonded. Under heavy traffic conditions, separation and cracking between different pavement layers are also prone to occur, thus affecting the normal use of the pavement structure. Utility Model Content

[0004] The purpose of this utility model is to provide a semi-flexible pavement structure in order to solve the problems mentioned above.

[0005] The technical solution adopted by this utility model is as follows: a semi-flexible pavement structure, including a semi-flexible pavement body, the semi-flexible pavement body including a semi-flexible surface layer, an anti-settlement layer and a subgrade layer laid from top to bottom, wherein the semi-flexible surface layer includes an asphalt concrete matrix and a modified cement grout injected into the asphalt concrete matrix, and the upper surface of the asphalt concrete matrix is ​​also coated with an outer protective layer; a reinforcing member embedded in the anti-settlement layer and the asphalt concrete matrix is ​​also provided.

[0006] In a preferred embodiment, the reinforcing member has a three-dimensional honeycomb structure, and the entire reinforcing member is made of basalt fiber material.

[0007] In a preferred embodiment, the reinforcement has a plurality of injection holes evenly distributed on it.

[0008] In a preferred embodiment, the outer protective layer is formed by coating with nano-silica material, and the thickness of the outer protective layer is 0.1 mm to 0.2 mm.

[0009] In a preferred embodiment, the anti-settlement layer is formed by laying polypropylene fiber concrete material, and the thickness of the anti-settlement layer is 1.5-3cm.

[0010] In a preferred embodiment, the base course is an interlocking structure formed by layering fine-grained crushed stone and large-grained crushed stone, and the base course is also filled with cement-based grout.

[0011] In a preferred embodiment, an interfacial bonding layer is formed between the subgrade and the anti-settlement layer, and between the anti-settlement layer and the asphalt concrete matrix, by coating with an interface agent.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: the honeycomb-shaped reinforcement between the semi-flexible surface layer and the anti-settlement layer can increase the contact area between the semi-flexible surface layer and the anti-settlement layer, thereby improving the firmness between the semi-flexible surface layer and the anti-settlement layer and making it less prone to interlayer delamination. Moreover, the honeycomb structure can also achieve lightweight and high rigidity, and can also improve the strength of the main body of the semi-flexible pavement, making it less prone to rutting problems. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall layered planar structure of this utility model;

[0014] Figure 2 This is a three-dimensional structural diagram of the reinforcement component in this utility model.

[0015] Marked in the image:

[0016] 100 - Semi-flexible pavement main body;

[0017] 110 - Asphalt concrete matrix;

[0018] 120-Modified cement grout;

[0019] 130-Ground level;

[0020] 140 - Interface bonding layer;

[0021] 150-Anti-settlement layer;

[0022] 160 - Reinforcing component; 161 - Injection hole position;

[0023] 170 - Outer protective layer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] Reference Figure 1-2 A semi-flexible pavement structure is characterized by comprising a semi-flexible pavement body 100, which includes a semi-flexible surface layer, an anti-settlement layer 150, and a base layer 130 laid sequentially from top to bottom. A reinforcement member 160 is embedded between the anti-settlement layer 150 and the asphalt concrete matrix 110. The reinforcement member 160 has a three-dimensional honeycomb structure and is made entirely of basalt fiber material. The honeycomb reinforcement member 160 between the semi-flexible surface layer and the anti-settlement layer 150 increases the contact area between them, thereby improving the firmness and bonding strength between them and reducing the likelihood of interlayer delamination. Simultaneously, the honeycomb structure achieves lightweight and high rigidity, further enhancing the strength of the semi-flexible pavement body 100 and reducing the likelihood of rutting. The high strength and modulus of basalt fiber allow it to maintain structural stability while bearing significant loads.

[0026] Furthermore, the semi-flexible surface layer includes an asphalt concrete matrix 110 and a modified cement grout 120 injected into the asphalt concrete matrix 110. The upper surface of the asphalt concrete matrix 110 is also coated with an outer protective layer 170. The modified cement grout 120 contains SBR (styrene-butadiene rubber) emulsion, acrylic emulsion, epoxy resin, etc., to improve flexibility and crack resistance, improve the bonding strength with asphalt, and increase the flexural strain of the grout by 30% to 50%, adapting to the deformation of the asphalt pavement. The asphalt concrete matrix 110 is also included.

[0027] Furthermore, the outer protective layer 170 is formed by coating with nano-silica material, and the thickness of the outer protective layer 170 is 0.1mm~0.2mm. Nano-silica material has extremely strong ultraviolet absorption and infrared reflection characteristics. These characteristics can effectively prevent ultraviolet rays and heat radiation from damaging the road surface material, thereby extending the service life of the road surface. Secondly, the high hardness and high strength characteristics of nano-silica can significantly improve the compressive, tensile and shear strength of the road surface, which helps to reduce the damage to the road surface under heavy traffic and improve the overall load-bearing capacity of the road surface. Moreover, nano-silica has special optical properties, which can improve the reflectivity and visibility of the road surface, especially at night or in adverse weather conditions, thereby improving driving safety.

[0028] Furthermore, the anti-settlement layer 150 is formed by laying polypropylene fiber concrete material. The thickness of the anti-settlement layer 150 is 1.5-3cm. Polypropylene fiber concrete can significantly improve the impact resistance and toughness of semi-flexible pavement. At the same time, the polypropylene monofilament fibers evenly distributed in the concrete not only prevent the semi-flexible pavement from settling, but also reduce the problem of segregation.

[0029] Furthermore, the reinforcement 160 has multiple grouting holes 161 evenly distributed on it. Polypropylene fiber concrete can be first poured into the grouting holes 161 and poured into the grouting holes 161 to 1 / 2 position. Then, an interface agent is applied, and the asphalt concrete matrix 110 is re-poured until the asphalt concrete matrix 110 is completely laid on the reinforcement 160. After pressing, the asphalt concrete matrix 110 and the anti-settlement layer 150 can be formed into a whole.

[0030] Furthermore, the base course 130 is an interlocking structure formed by layering fine-grained crushed stone and large-grained crushed stone. Cement-based grout is also injected into the base course 130. The fine-grained crushed stone and large-grained crushed stone layers can form a dense skeleton interlocking structure. At the same time, the gaps are filled with cement-based grout. The strength and density formed after the cement-based grout is bonded together with the anti-settlement layer 150 to resist the destructive effects of vehicle loads and water, which can reduce the problems of settlement and cracking.

[0031] Furthermore, an interface bonding layer 140 is formed between the base layer 130 and the anti-settlement layer 150, and between the anti-settlement layer 150 and the asphalt concrete substrate 110, by coating with an interface agent. The interface agent achieves chemical bonding between different material layers, effectively solving the problem of interlayer bonding failure. Since the interface agent is an existing and well-known technology, its specific composition and structure will not be described in detail here.

[0032] The specific implementation principle is as follows: A honeycomb-shaped reinforcement 160 is designed between the semi-flexible surface layer and the anti-settlement layer 150, which can increase the contact area between the semi-flexible surface layer and the anti-settlement layer 150, thereby improving the firmness between the semi-flexible surface layer and the anti-settlement layer 150 and making it less prone to interlayer delamination. Moreover, the honeycomb structure can also achieve lightweight and high rigidity, and can also improve the strength of the semi-flexible pavement body 100, making it less prone to rutting. At the same time, an interface agent is coated between each surface layer, which achieves chemical bonding between different material layers, effectively solving the problem of interlayer bonding failure.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A semi-flexible pavement structure, characterized in that, The system includes a semi-flexible pavement body, which comprises a semi-flexible surface layer, an anti-settlement layer, and a base layer laid sequentially from top to bottom. The semi-flexible surface layer includes an asphalt concrete matrix and a modified cement grout injected into the asphalt concrete matrix. The upper surface of the asphalt concrete matrix is ​​also coated with an outer protective layer. Reinforcing members embedded in the anti-settlement layer and the asphalt concrete matrix are also provided between them.

2. The semi-flexible pavement structure of claim 1, wherein: The reinforcing member has a three-dimensional honeycomb structure and is made entirely of basalt fiber material.

3. The semi-flexible pavement structure of claim 2, wherein: The reinforcement has multiple injection holes evenly distributed on it.

4. The semi-flexible pavement structure of claim 1, wherein: The outer protective layer is formed by coating with nano-silica material, and the thickness of the outer protective layer is 0.1mm~0.2mm.

5. The semi-flexible pavement structure of claim 1, wherein: The anti-settlement layer is formed by laying polypropylene fiber concrete material, and the thickness of the anti-settlement layer is 1.5-3cm.

6. The semi-flexible pavement structure of claim 1, wherein: The base course is an interlocking structure formed by layering fine-grained crushed stone and large-grained crushed stone, and cement-based grout is also injected into the base course.

7. The semi-flexible pavement structure of claim 1, wherein: An interface bonding layer is formed between the base course and the anti-settlement layer, as well as between the anti-settlement layer and the asphalt concrete matrix, by coating with an interface agent.

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