A rut-free semi-flexible asphalt pavement structure

Abstract

This utility model relates to the field of road engineering, specifically to a rutting-free semi-flexible asphalt pavement structure, comprising, from bottom to top: a cement-stabilized crushed stone base course; a bonding layer composed of a 0.5-0.8 kg / m² modified emulsified asphalt prime coat and a 2.0-2.5 kg / m² rubber asphalt tack coat; a semi-flexible asphalt lower layer using open-graded asphalt mixture; a stress-absorbing layer using highly elastic modified asphalt sand; a semi-flexible asphalt upper layer using discontinuously graded asphalt mixture; and a functional layer using a water-based epoxy resin seal coat. This utility model, through its double-layer semi-flexible structure and gradient porosity design, enhances the overall strength and deformation resistance of the pavement, significantly improving rutting resistance; the composite bonding layer design effectively improves the adhesion between the base course and the surface course, preventing interlayer slippage and ensuring strong interlayer bonding; a three-dimensional drainage network and edge drainage system quickly remove surface water, reducing water damage and optimizing drainage performance; and the application of the stress-absorbing layer and polyester fibers effectively disperses stress concentration caused by vehicle loads, resulting in uniform stress distribution.

Description

Technical Field

[0001] This utility model relates to the field of road engineering, specifically to a rut-free semi-flexible asphalt pavement structure. Background Technology

[0002] Traditional semi-flexible asphalt pavement consists of an asphalt mixture skeleton and cement mortar injected into it, combining the characteristics of flexibility and rigidity.

[0003] However, rutting can still occur under conditions such as heavy traffic and high temperatures. The main reasons include: An unreasonable design of the porosity of the asphalt mixture skeleton leads to insufficient structural strength; Poor adhesion between the base layer and the surface layer easily leads to interlayer slippage; An inadequate drainage system allows surface water to seep into the structural layers, accelerating damage.

[0004] Therefore, those skilled in the art have provided a rutting-free semi-flexible asphalt pavement structure to solve the problems mentioned in the background art. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a rut-free semi-flexible asphalt pavement structure. From bottom to top, this includes: Cement-stabilized crushed stone base course, 20-30cm thick; The bonding layer consists of a 0.5-0.8 kg / m² modified emulsified asphalt prime coat and a 2.0-2.5 kg / m² rubber asphalt tack coat; The semi-flexible asphalt base course uses OGFC-16 open-graded asphalt mixture with a porosity of 18-22% and a thickness of 4-6cm. The stress-absorbing layer is made of highly elastic modified asphalt sand with a thickness of 1-2cm; The semi-flexible asphalt surface layer uses SMA-13 ​​discontinuous graded asphalt mixture with a porosity of 15-18% and a thickness of 3-5cm. The functional layer is sealed with water-based epoxy resin with a thickness of 0.3-0.5cm; in: A three-dimensional drainage network is pre-embedded in the cement-stabilized crushed stone base course. The spacing of the three-dimensional drainage network is 1.0-1.5m, and it is connected to the road edge drainage system. The stress-absorbing layer contains uniformly dispersed polyester fibers with a fiber length of 6-12 mm and a content of 0.3-0.5%. The porosity of the semi-flexible asphalt lower layer is 3-5% higher than that of the semi-flexible asphalt upper layer.

[0006] Preferably, the three-dimensional drainage net has a rhomboid mesh structure, with a mesh unit size of 10cm×10cm, and the vertical distance between the mesh node and the top surface of the cement-stabilized crushed stone base is 1 / 3 to 1 / 2 of the base thickness.

[0007] Preferably, the three-dimensional drainage net is connected to the drainage ditch at the edge of the road surface through a vertical conduit, the spacing between the conduits is the same as the spacing of the drainage net, and the diameter of the conduit is 5-8cm.

[0008] Preferably, the polyester fibers are randomly distributed in three dimensions within the stress-absorbing layer, and the fiber surface is roughened.

[0009] Preferably, the semi-flexible asphalt lower layer is filled with cement-based grouting material with a grouting filling rate of ≥95%; the semi-flexible asphalt upper layer is filled with high-strength cement mortar with a compressive strength of ≥30MPa.

[0010] Preferably, an interface transition layer is provided between the stress-absorbing layer and the semi-flexible asphalt lower layer. The interface transition layer is composed of quartz sand with a particle size of 0.3-0.6 mm and modified asphalt in a mass ratio of 1:3, and has a thickness of 2-4 mm.

[0011] Preferably, the surface of the functional layer is pressed with micro-groove textures with a depth of 0.5-1.0 mm, a texture density of 3-5 grooves / cm, and the texture direction is parallel to the longitudinal slope of the road surface.

[0012] Preferably, the thickness ratio of the semi-flexible asphalt lower layer to the semi-flexible asphalt upper layer is 1.2:1-1.5:1, and the fluidity of the semi-flexible asphalt lower layer grouting material is higher than that of the semi-flexible asphalt upper layer mortar.

[0013] The technical effects and advantages of this utility model are as follows: Significantly improved rutting resistance: Through a double-layer semi-flexible structure and gradient porosity design, the overall strength and deformation resistance of the pavement are enhanced; Strong interlayer adhesion: The composite adhesive layer design effectively improves the adhesion between the base layer and the surface layer, preventing interlayer slippage; Drainage performance optimization: Three-dimensional drainage network and edge drainage system quickly remove surface water and reduce water damage; Uniform stress dispersion: The application of stress-absorbing layers and polyester fibers effectively disperses stress concentration caused by vehicle loads. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a rut-free semi-flexible asphalt pavement structure provided in an embodiment of this application; In the picture: 1. Cement-stabilized crushed stone base layer; 2. Bonding layer; 3. Semi-flexible asphalt lower layer; 4. Stress-absorbing layer; 5. Semi-flexible asphalt upper layer; 6. Functional layer; 7. Three-dimensional drainage network; 8. Interface transition layer. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0016] Please see Figure 1 This embodiment provides a rutting-free semi-flexible asphalt pavement structure, which includes, from bottom to top: The cement-stabilized crushed stone base course 1 has a thickness of 20-30cm. A three-dimensional drainage net 7 is pre-embedded in the cement-stabilized crushed stone base course 1. The spacing of the three-dimensional drainage net 7 is 1.0-1.5m, and it is connected to the road edge drainage system. The pre-embedded three-dimensional drainage net 7 forms a water guiding channel to prevent water from stagnating and softening the cement-stabilized crushed stone base course 1, thus solving the drainage defects of the prior art. Adhesive layer 2 consists of a 0.5-0.8 kg / m² modified emulsified asphalt prime coat and a 2.0-2.5 kg / m² rubber asphalt tack coat. The double adhesive layer prime coat + tack coat provides a continuous interface between layers, forming the basic structure. The semi-flexible asphalt lower layer 3 uses OGFC-16 open-graded asphalt mixture with a porosity of 18-22% and a thickness of 4-6cm. The large porosity facilitates grouting penetration and also serves as a secondary drainage layer, working in conjunction with the three-dimensional drainage network 7 to form active drainage. The stress-absorbing layer 4 is made of highly elastic modified asphalt sand with a thickness of 1-2 cm. Polyester fibers are uniformly dispersed in the stress-absorbing layer 4. The polyester fibers are 6-12 mm in length and have a dosage of 0.3-0.5%. The three-dimensional distribution of polyester fibers forms a spatial grid, which disperses stress waves and inhibits the propagation of reflected cracks. The semi-flexible asphalt surface layer 5 uses SMA-13 ​​discontinuous graded asphalt mixture with a porosity of 15-18% and a thickness of 3-5cm. The smaller voids seal the surface and form a stepped interlocking body with the semi-flexible asphalt bottom layer 3, improving the overall rutting resistance stiffness. Functional layer 6 is sealed with water-based epoxy resin with a thickness of 0.3-0.5cm. The surface of functional layer 6 is pressed with micro-groove textures with a depth of 0.5-1.0mm and a texture density of 3-5 grooves / cm. The texture direction is parallel to the longitudinal slope of the road surface. The micro-groove textures increase frictional resistance and assist in anti-skid and noise reduction.

[0017] The porosity of the semi-flexible asphalt lower layer 3 is 3-5% higher than that of the semi-flexible asphalt upper layer 5.

[0018] The three-dimensional drainage net 7 has a rhomboid grid structure, with a grid unit size of 10cm×10cm. The vertical distance between the grid node and the top surface of the cement-stabilized crushed stone base 1 is 1 / 3 to 1 / 2 of the base thickness.

[0019] The three-dimensional drainage net 7 is connected to the drainage ditch at the edge of the road through vertical conduits. The spacing between the conduits is the same as the spacing between the drainage nets, and the diameter of the conduits is 5-8cm.

[0020] The semi-flexible asphalt lower layer 3 is filled with cement-based grouting material with a grouting filling rate of ≥95%; the semi-flexible asphalt upper layer 5 is filled with high-strength cement mortar with a compressive strength of ≥30MPa.

[0021] An interface transition layer 8 is provided between the stress-absorbing layer 4 and the semi-flexible asphalt lower layer 3. The interface transition layer 8 is composed of quartz sand with a particle size of 0.3-0.6 mm and modified asphalt in a mass ratio of 1:3, and has a thickness of 2-4 mm.

[0022] The thickness ratio of the semi-flexible asphalt lower layer 3 to the semi-flexible asphalt upper layer 5 is 1.2:1-1.5:1, and the fluidity of the grouting material of the semi-flexible asphalt lower layer 3 is higher than that of the mortar of the semi-flexible asphalt upper layer 5.

[0023] When using this utility model, Drainage process: Rainwater seeps into the voids of the semi-flexible asphalt surface layer 5 → flows into the semi-flexible asphalt bottom layer 3 through the gradient void difference → seeps down to the cement-stabilized crushed stone base layer 1; The three-dimensional drainage network quickly collects water and discharges it through a conduit to the roadside drainage ditch.

[0024] Crack resistance process: Cracks in cement-stabilized crushed stone base layer 1 extend to stress absorption layer 4 → Polyester fiber three-dimensional network blocks stress concentration at crack tip → Crack energy is dispersed and absorbed.

[0025] Anti-rutting process: The load is applied to functional layer 6 → gradient grouting body semi-flexible asphalt lower layer 3 grouting material + semi-flexible asphalt upper layer 5 mortar to form a rigid skeleton → semi-flexible asphalt lower layer 3 large void grouting body provides support, and upper semi-flexible asphalt upper layer 5 small void body inhibits deformation.

[0026] All materials mentioned in this article are existing materials. The detailed description of known functions and materials is omitted in the specific implementation of this disclosure. In order to ensure the compatibility of the equipment, the operating methods adopted are consistent with the parameters of materials available on the market.

[0027] In this solution, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this solution according to the specific circumstances.

[0028] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A rutting-free semi-flexible asphalt pavement structure, characterized in that, From bottom to top, this includes: Cement-stabilized crushed stone base course (1), with a thickness of 20-30cm; The bonding layer (2) consists of a 0.5-0.8 kg / m² modified emulsified asphalt prime coat and a 2.0-2.5 kg / m² rubber asphalt tack coat; The semi-flexible asphalt lower layer (3) uses open-graded asphalt mixture with a void ratio of 18-22% and a thickness of 4-6cm. The stress-absorbing layer (4) is made of highly elastic modified asphalt sand with a thickness of 1-2 cm; The semi-flexible asphalt surface layer (5) uses discontinuous graded asphalt mixture with a void ratio of 15-18% and a thickness of 3-5cm. The functional layer (6) is sealed with water-based epoxy resin with a thickness of 0.3-0.5cm; in: The cement-stabilized crushed stone base course (1) is pre-embedded with a three-dimensional drainage net (7), the spacing of the three-dimensional drainage net (7) is 1.0-1.5m, and it is connected to the road edge drainage system; The stress-absorbing layer (4) contains uniformly dispersed polyester fibers with a fiber length of 6-12 mm and a content of 0.3-0.5%. The porosity of the semi-flexible asphalt lower layer (3) is 3-5% higher than that of the semi-flexible asphalt upper layer (5).

2. The rutting-free semi-flexible asphalt pavement structure according to claim 1, characterized in that, The three-dimensional drainage net (7) has a rhomboid grid structure, with a grid unit size of 10cm×10cm. The vertical distance between the grid node and the cement-stabilized crushed stone base (1) is 1 / 3-1 / 2 of the base thickness.

3. The rutting-free semi-flexible asphalt pavement structure according to claim 2, characterized in that, The three-dimensional drainage net (7) is connected to the drainage ditch at the edge of the road through vertical conduits. The spacing between the conduits is the same as the spacing between the drainage nets, and the diameter of the conduits is 5-8cm.

4. The rutting-free semi-flexible asphalt pavement structure according to claim 1, characterized in that, The polyester fibers are randomly distributed in three dimensions within the stress-absorbing layer (4).

5. The rutting-free semi-flexible asphalt pavement structure according to claim 1, characterized in that, The semi-flexible asphalt lower layer (3) is filled with cement-based grouting material with a grouting filling rate of ≥95%; the semi-flexible asphalt upper layer (5) is filled with high-strength cement mortar with a compressive strength of ≥30MPa.

6. The rutting-free semi-flexible asphalt pavement structure according to claim 1, characterized in that, An interface transition layer (8) is provided between the stress-absorbing layer (4) and the semi-flexible asphalt lower layer (3). The interface transition layer (8) is composed of quartz sand with a particle size of 0.3-0.6 mm and modified asphalt in a mass ratio of 1:3, and has a thickness of 2-4 mm.

7. The rutting-free semi-flexible asphalt pavement structure according to claim 1, characterized in that, The surface of the functional layer (6) is pressed with micro-groove textures with a depth of 0.5-1.0 mm, a texture density of 3-5 lines / cm, and the texture direction is parallel to the longitudinal slope of the road surface.

8. The rutting-free semi-flexible asphalt pavement structure according to claim 1, characterized in that, The thickness ratio of the semi-flexible asphalt lower layer (3) to the semi-flexible asphalt upper layer (5) satisfies 1.2:1-1.5:1, and the fluidity of the grouting material of the lower semi-flexible asphalt lower layer (3) is higher than that of the mortar of the semi-flexible asphalt upper layer (5).

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