Regenerated self-healing type pavement structure with high-strength crack resistance

Abstract

The utility model provides a regenerated self-healing type pavement structure with high-strength crack resistance. The structure comprises a base layer, a lower surface layer, a milling surface, a rubber asphalt regeneration functional layer, a super-viscous modified emulsified asphalt bonding layer, a 3D printing material layer of a diamond structure, a super-viscous modified emulsified asphalt bonding layer and a regeneration self-healing super-viscous tough asphalt wearing layer which are sequentially laid from bottom to top. The upper surface layer is a regenerated self-healing super-viscous tough asphalt wearing layer, reclaimed materials recycled through milling and planing are adopted, energy conservation and environmental protection are achieved, the strength of the pavement is improved through super-viscous tough asphalt, and the crack resistance of the pavement is further improved through combination of the regeneration technology and the self-healing technology; the layered 3D printing material of the rhombic structure is beneficial for realizing uniform load distribution, reducing the local stress of the structure and improving the bearing capacity and the stability; and the middle surface layer adopts a rubber asphalt regeneration functional layer, an asphalt pavement old material recovered by milling is adopted, and a rubber asphalt regeneration mixture is high in strength, good in thermal stability and good in crack resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of pavement structures, in particular to a regenerative self-healing pavement structure with high-strength anti-cracking performance. Background Art

[0002] With the continuous development of the highway industry, the demand for road maintenance and repair continues to increase, and maintenance technology is also rapidly evolving. Against the backdrop of global climate change and environmental protection, highway construction, operation, and maintenance will place greater emphasis on energy conservation and emission reduction, adopting environmentally friendly materials and energy-saving technologies to drive the industry's transformation towards a low-carbon, environmentally friendly approach. Currently, the recycling rate of waste highway materials remains low, especially for waste asphalt mixtures, which only account for approximately 40%. This wastes resources and pollutes the environment. Furthermore, pavement lifespans are generally short. Extending pavement lifespans can create a more durable, environmentally friendly, and self-repairing road system. Therefore, strengthening the reuse of recycled RAP materials from pavement and establishing an industrial chain aligned with a circular economy model will be a key direction for future highway maintenance.

[0003] To address current highway maintenance issues and the need for green pavement construction, pavement regeneration and self-healing technologies have been widely utilized. Asphalt pavement recycling technology can largely utilize old road materials from the original pavement to construct new pavement, conserving resources while achieving energy conservation and environmental protection. However, recycled asphalt pavements often have low crack resistance and are prone to various cracks, which seriously affect the pavement's service life. Self-healing technology can enhance the asphalt pavement's inherent healing ability, reduce the occurrence of various microcracks in the asphalt pavement, and extend the pavement's service life. Combining asphalt pavement regeneration with self-healing technology can reuse asphalt pavement surface materials, enhance the pavement structure's crack resistance, and fully utilize the pavement structure's residual value, thereby generating greater economic benefits over the road's life cycle. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a regenerative, self-healing pavement structure with high crack resistance. This new structure aims to address the poor crack resistance and short service life of existing regenerated asphalt pavements. It is a new green pavement structure that effectively conserves resources and improves the strength and crack resistance of regenerated pavements.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A regenerative self-healing pavement structure with high crack resistance, comprising a base layer, a lower layer, a milling surface, a rubber asphalt regeneration functional layer, a lower super-viscous modified emulsified asphalt bonding layer, a 3D printing material layer, an upper super-viscous modified emulsified asphalt bonding layer, and a regenerative self-healing super-viscous and tough asphalt wear layer, which are laid in sequence from bottom to top.

[0007] The base layer and the lower layer are the original pavement structure;

[0008] The rubber asphalt recycled functional layer is the middle surface layer in the pavement structure;

[0009] The regenerated self-healing super-tough asphalt wearing course is the upper layer in the pavement structure.

[0010] As a further preferred solution, anti-crack stickers are provided at the cracks of the milling surface.

[0011] As a further preferred solution, the thickness of the anti-cracking tape on the milling surface is 2 mm.

[0012] As a further preferred solution, the thickness of the rubber asphalt regeneration functional layer is 4 to 6 cm, and the mass proportion of the used milling materials in the waste milling materials collected from the milling process of the original middle surface layer is 30%.

[0013] As a further preferred solution, the spraying rate of the upper super-viscous modified emulsified asphalt bonding layer is 0.6-0.8L / m 2 The spreading amount of the lower super-sticky modified emulsified asphalt bonding layer is 0.3-0.5L / m 2 During the construction process, a synchronous paver is used to spread the upper super-sticky modified emulsified asphalt bonding layer and the lower super-sticky modified emulsified asphalt bonding layer.

[0014] As a further preferred solution, the thickness of the 3D printing material layer is 4 mm, and a diamond-shaped structure 3D printing composite material is used.

[0015] As a further preferred embodiment, the upper surface of the 3D printing material layer is distributed with numerous circular depressions, which are covered with an upper layer of super-sticky modified emulsified asphalt bonding layer.

[0016] As a further preferred solution, the regenerated self-healing super-viscous and tough asphalt wearing layer adopts super-viscous and tough modified asphalt, the maximum nominal particle size of which is 10 mm.

[0017] As a further preferred solution, the milling material used in the regenerated self-healing super-tough asphalt wearing layer accounts for 30% by mass of the waste milling material collected from the milling process of the original top layer and has a thickness of 2 to 4 cm.

[0018] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0019] The maintenance pavement structure of this utility model is a new green pavement structure that is regenerated after milling the upper layer of the original pavement. The original pavement surface is a milled surface with anti-crack stickers added on it, which can effectively prevent and control reflective cracks in the base layer.

[0020] The middle surface layer uses rubber asphalt as a recycled functional layer. The asphalt pavement material is recycled by milling. Rubber asphalt has high strength, water stability and crack resistance, good thermal stability and good crack resistance, which improves the strength and life of the pavement and further prevents the upper wear layer from being affected by reflective cracks in the lower layer.

[0021] A diamond-shaped 3D-printed material layer is provided in the two layers of super-viscous emulsified asphalt bonding layers, which further improves the pavement strength and resource utilization. The upper layer is a regenerated self-healing super-viscous and tough asphalt wear layer, which uses recycled materials recovered by milling. It is energy-saving and environmentally friendly. The super-viscous and tough asphalt improves the pavement strength. Compared with the traditional regenerated super-viscous and tough asphalt wear layer, steel wool and other inductive phase materials are added. The combination of regeneration technology and self-healing technology further improves the pavement's resistance to cracking.

[0022] The diamond-shaped structure of the 3D printed material layer helps to achieve uniform load distribution, reduce local stress in the structure, improve the bearing capacity and stability of the structure, and at the same time has a certain environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure shows the regenerative self-healing pavement structure with high strength and crack resistance described in the present invention;

[0024] Figure 2 Shown is the upper surface of the 3D printed material layer with a diamond structure;

[0025] In the figure: 1. Regenerated self-healing super-sticky and tough asphalt wear layer, 2. Upper super-sticky modified emulsified asphalt bonding layer, 3. 3D printing material layer, 31. Diamond structure, 32. Circular concave holes, 4. Lower super-sticky modified emulsified asphalt bonding layer, 5. Rubber asphalt regeneration functional layer, 6. Milling surface, 7. Lower layer. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] The utility model provides a regenerative self-healing pavement structure with high strength and crack resistance, such as Figure 1As shown, the structure includes a base layer, a lower layer 7, a milling surface 6, a rubber asphalt regeneration functional layer 5, a lower super-sticky modified emulsified asphalt bonding layer 4, a diamond-shaped 3D printing material layer 3, a diamond structure 31, a circular concave hole 32, an upper super-sticky modified emulsified asphalt bonding layer 2, and a regenerated self-healing super-sticky and tough asphalt wear layer 1, which are laid in sequence from bottom to top; wherein the base layer and the lower layer 7 are the original pavement structure, the rubber asphalt regeneration functional layer 5 is the middle surface layer, and the regenerated self-healing super-sticky and tough asphalt wear layer 1 is the upper layer in the pavement structure.

[0028] The lower layer 7 is the original asphalt pavement with a thickness of 6cm~10cm. The base layer below is a 40cm thick fly ash stabilized soil layer or cement stabilized gravel layer. The upper layer is the milling surface 6, and the thickness of the anti-cracking tape on the milling surface is 2mm.

[0029] The milling surface 6 is the upper surface of the lower layer 7 left after the asphalt pavement to be repaired is milled, and the crack-resistant patch is provided at the portion of the milling surface 6 where there are cracks.

[0030] By adopting the above technical solution, the reflective cracks of the base layer can be prevented from affecting the upper asphalt structure layer.

[0031] Above the milling surface 6 is the rubber asphalt regeneration functional layer 5, the mass of the milling material used accounts for 30% of the waste milling material collected from the milling process of the original middle surface layer, the thickness is 4 to 6 cm, and it replaces the middle surface layer of the original road surface.

[0032] By adopting the above technical solutions, the strength of the regenerated pavement is effectively improved, and the excellent crack resistance of rubber asphalt further reduces the occurrence of pavement cracks.

[0033] The rubber asphalt regeneration functional layer 5 is topped with the lower super-adhesive modified emulsified asphalt bonding layer 4, with a spreading rate of 0.3~0.5L / m 2 During the construction process, a synchronous paver is used to spread the super-sticky modified emulsified asphalt bonding layer.

[0034] Upper super-adhesive modified emulsified asphalt bonding layer 2, with a spreading rate of 0.6~0.8 L / m 2 During the construction process, a synchronous paver is used to spread the super-sticky modified emulsified asphalt bonding layer.

[0035] The diamond-shaped 3D printing material layer 3 is located between the upper and lower super-adhesive modified emulsified asphalt bonding layers and has a thickness of 4 mm.

[0036] As a preferred option, 3D printing materials, as a new type of material, are gradually being applied and developed in the field of green roads. They can effectively save materials, reduce costs and reduce pollution. They also have a certain strength. The diamond structure, as a special structure in 3D printing materials, can disperse stress due to its geometric shape, providing high strength while maintaining low weight; it is usually hollow or porous, and the material utilization rate is high during 3D printing, saving raw materials while reducing costs; the diamond structure has good thermal conductivity and energy absorption characteristics. When impacted, the diamond structure can effectively absorb and disperse energy, reducing damage to the main material.

[0037] The diamond structure and the circular concave hole structure are located in the 3D printing material layer 3, wherein the circular concave holes are distributed on the upper surface of the 3D printing material layer 3 of the diamond structure and are in contact with the upper super-sticky modified emulsified asphalt bonding layer 2.

[0038] By adopting the above technical solution, the contact area between the 3D printing material and the super-viscous emulsified asphalt is increased, and the emulsified asphalt is filled into the concave holes, which can effectively prevent the lateral slippage of the diamond-shaped 3D printing material layer 3 and the super-viscous emulsified asphalt layer, thereby strengthening the interlayer bonding ability.

[0039] The regenerated self-healing super-viscous and tough asphalt wearing layer 1 is regenerated with super-viscous and tough modified asphalt. The quality requirements of this layer are relatively high, with a thickness of 2 to 4 cm and a maximum nominal particle size of 10 mm.

[0040] The regenerated self-healing super-tough asphalt wearing layer 1 is regenerated with super-tough modified asphalt. The mass of the milling material used in the waste milling material collected from the milling process of the original top layer accounts for 30%, the added conductive phase self-healing material accounts for 2%, and the thickness is 2~4cm.

[0041] The above technical solution combines pavement regeneration and self-healing technologies. Both are widely used as exemplary new green pavement maintenance technologies. Recycled asphalt pavements often lack crack resistance, while self-healing asphalt pavements can repair even tiny cracks, providing excellent crack resistance. This overcomes this common shortcoming of recycled asphalt pavements and further extends their service life.

[0042] The construction process of the high-strength, crack-resistant, regenerative self-healing pavement structure described in this embodiment is as follows:

[0043] During the maintenance process of the old pavement structure, the middle and upper layers of the old pavement are first milled, and then anti-cracking stickers are set on the cracks of the original pavement. The rubber asphalt regeneration functional layer 5, the upper super-sticky modified emulsified asphalt bonding layer 4, the diamond-shaped 3D printing material layer 3, the super-sticky modified emulsified asphalt bonding layer 2, and the regenerated self-healing super-sticky and tough asphalt wear layer 1 are then laid in sequence.

[0044] The thickness of the anti-crack sticker on the milling surface 6 is 2 mm. It is a roll-up crack-resistant waterproof membrane that can prevent reflective cracks caused by temperature influence and vertical load from being reflected to the surface layer.

[0045] The milling material used in the rubber asphalt regeneration functional layer 5 and the regenerated self-healing super-tough asphalt wear layer 1 accounts for 30% by mass of the waste milling material collected from the milling process of the original middle surface layer. When the RAP material accounts for 30%, the best pavement effect and economic benefits can be achieved.

[0046] When spreading super-viscous modified emulsified asphalt, the spreading amount of the upper and lower layers of the super-viscous modified emulsified asphalt bonding layer is 0.6-0.8L / m 2 and 0.3-0.5 L / m 2 During the construction process, a synchronous paver is used to spread super-viscous modified emulsified asphalt. Different spreading amounts should be set during the construction of the upper and lower layers to meet different pavement performance requirements.

[0047] The diamond-shaped 3D printing material layer 3 should be provided with circular concave holes 32 on its upper surface to improve the interlayer shear resistance of the super-adhesive modified emulsified asphalt bonding layer and enhance the stability of the pavement structure.

[0048] The regenerated self-healing super-viscous and tough asphalt wearing layer 1 is regenerated using super-viscous and tough modified asphalt, and the nominal maximum particle size thereof is required to be 10 mm, so as to increase the wear resistance of the road surface and effectively reduce noise.

[0049] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A regenerative self-healing pavement structure with high strength and crack resistance, characterized by: The pavement structure comprises a base layer, a lower layer (7), a milling surface (6), a rubber asphalt regeneration functional layer (5), a lower super-viscous modified emulsified asphalt bonding layer (4), a 3D printing material layer (3), an upper super-viscous modified emulsified asphalt bonding layer (2), and a regenerated self-healing super-viscous and tough asphalt wearing layer (1) which are laid in sequence from bottom to top; wherein the base layer and the lower layer (7) are the original pavement structure; The rubber asphalt regeneration functional layer (5) is the middle surface layer in the pavement structure; The regenerated self-healing super-viscous and tough asphalt wearing layer (1) is the upper layer in the pavement structure.

2. The regenerative self-healing pavement structure with high strength and crack resistance according to claim 1, characterized in that: Anti-crack stickers are provided at the cracks of the milling surface (6).

3. The regenerative self-healing pavement structure with high strength and crack resistance according to claim 2, characterized in that: The thickness of the anti-cracking tape on the milling surface (6) is 2 mm.

4. The regenerative self-healing pavement structure with high strength and crack resistance according to claim 1, characterized in that: The thickness of the rubber asphalt regeneration functional layer (5) is 4 to 6 cm, and the rubber asphalt regeneration functional layer (5) uses milling material from the milling surface (6).

5. The regenerative self-healing pavement structure with high strength and crack resistance according to claim 1, characterized in that: The spreading amount of the upper super-viscous modified emulsified asphalt bonding layer (2) is 0.6-0.8 L / m 2 The spreading amount of the lower super-adhesive modified emulsified asphalt bonding layer (4) is 0.3 to 0.5 L / m 2 .

6. The regenerative self-healing pavement structure with high strength and crack resistance according to claim 1, characterized in that: The thickness of the 3D printing material layer (3) is 4 mm, and a diamond-shaped 3D printing composite material is used.

7. A regenerative self-healing pavement structure with high strength and crack resistance according to claim 1 or 6, characterized in that: The upper surface of the 3D printing material layer (3) is distributed with circular concave spots, which are covered with an upper layer of super-viscous modified emulsified asphalt bonding layer (2).

8. A regenerative self-healing pavement structure with high strength and crack resistance according to claim 1 or 6, characterized in that: The regenerated self-healing super-viscous and tough asphalt wearing layer (1) adopts super-viscous and tough modified asphalt, and the nominal particle size of the maximum particle size is 10 mm.

9. A regenerative self-healing pavement structure with high strength and crack resistance according to claim 1 or 6, characterized in that: The regenerated self-healing super-sticky and tough asphalt wearing layer (1) uses milling material from the milling surface (6).

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