High performance semi-flexible poured asphalt pavement for highway toll station

Abstract

The utility model relates to a kind of high-performance semi-flexible filling type asphalt pavement of highway toll station, it is laid on old base after pretreatment, from bottom to top sequentially include: composite limiting layer, composite stress absorption layer and surface layer;The composite limiting layer includes the geogrid laid on the old base and the fiberglass mesh cloth covered on the geogrid;By setting composite limiting layer, the stability of asphalt pavement base is enhanced and the emission of crack is inhibited, by setting composite stress absorption layer, stress is absorbed and dispersed, to reduce deformation, to realize the service life of extension pavement;Among them, by the geogrid and fiberglass mesh cloth in composite limiting layer through slurry form anti-crack barrier, old base crack can be inhibited to expand upwards;Three-dimensional random fiber layer of composite stress absorption layer can realize dispersion stress, prevent fatigue crack, prolong the service life of pavement.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt pavement construction, and specifically designs a high-performance semi-flexible grouting asphalt pavement for highway toll stations. Background Technology

[0002] Due to frequent vehicle starts and stops, heavy loads, and turns, highway toll stations subject the road surface to high shear forces and dynamic loads, making it prone to rutting, cracking, and fatigue failure. Traditional paving methods mostly involve directly laying asphalt on the old base layer to form an asphalt pavement. Asphalt pavements paved in this way have insufficient fatigue resistance and are prone to cracking. While some existing semi-flexible pavements have certain characteristics of both flexibility and rigidity, the bonding force between the base layer and the surface layer is weak, resulting in limited crack resistance and low utilization of the old base layer. Utility Model Content

[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a high-performance semi-flexible grouting asphalt pavement for highway toll stations.

[0004] The technical solution adopted by this utility model is as follows: it is laid on the pretreated old base layer and includes, from bottom to top, a composite limiting layer, a composite stress absorbing layer and a surface layer.

[0005] The composite limiting layer includes a geogrid laid on the old base layer and a fiberglass mesh covering the geogrid;

[0006] The composite stress-absorbing layer comprises, from bottom to top, a lower asphalt binder layer, a three-dimensional randomized fiber layer, an upper asphalt binder layer, and a crushed stone layer. The randomized fiber layer is formed by multiple fine fibers randomly and uniformly distributed.

[0007] As a preferred embodiment of this invention, the fiberglass mesh is bonded to the geogrid using slurry.

[0008] As a preferred embodiment of this invention, the slurry is a modified asphalt emulsion or a polymer cement slurry.

[0009] As a preferred embodiment of this utility model, the geogrid is a high-strength polyester geogrid with a tensile strength of not less than 100kN / m.

[0010] As a preferred embodiment of this invention, the lower asphalt binder layer is made of high-viscosity modified asphalt with a thickness of 10-20 mm.

[0011] As a preferred embodiment of this invention, the fiber filaments are polypropylene fibers or glass fibers, and their length is 10-30 mm.

[0012] As a preferred embodiment of this invention, the upper asphalt binder layer is made of high-viscosity modified asphalt with a thickness of 15-25mm.

[0013] As a preferred embodiment of this invention, the crushed stone layer has a crushed stone particle size of 5-10 mm and a compaction degree of not less than 98%.

[0014] As a preferred embodiment of this invention, the surface layer is high-modulus asphalt concrete.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention relates to a high-performance semi-flexible grouted asphalt pavement for highway toll stations. It enhances the stability of the asphalt pavement base layer and inhibits crack propagation by incorporating a composite restraint layer. A composite stress-absorbing layer absorbs and disperses stress, alleviating shear and tensile stresses from vehicle loads, thus reducing deformation and extending pavement service life. Specifically, the geogrid and fiberglass mesh in the composite restraint layer form a crack-resistant barrier through grouting, inhibiting the upward propagation of cracks in the old base layer. The three-dimensional randomized fiber layer of the composite stress-absorbing layer disperses stress, preventing fatigue cracks and extending pavement service life. Simultaneously, the three-dimensional randomized fiber layer absorbs micro-strains caused by repeated loading, while high-viscosity modified asphalt provides flexible support, significantly improving fatigue resistance and meeting the high-frequency heavy-load requirements of toll stations. The interlocking of the geogrid mesh and the high compaction of the crushed stone layer enhance pavement rigidity, and the mechanical anchoring structure improves interlayer shear strength, giving the asphalt pavement high tensile strength. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial cross-sectional structural schematic diagram of the present invention.

[0020] In the diagram: 1. Composite confinement layer;

[0021] 2. Composite stress-absorbing layer, 21. Crushed stone layer, 22. Upper asphalt binder layer, 23. Three-dimensional random fiber layer, 24. Lower asphalt binder layer;

[0022] 3 surface layer, 31 geogrid, 32 fiberglass mesh;

[0023] 4. Old grassroots level. 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 for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The following is combined with Figure 1-2 This invention describes a high-performance semi-flexible grouting asphalt pavement for highway toll stations, laid on a pre-treated old base course 4, comprising, from bottom to top: a composite limiting layer 1, a composite stress absorbing layer 2, and a surface layer 3.

[0027] The composite limiting layer 1 includes a geogrid 31 laid on the old base course 4 and a fiberglass mesh 32 covering the geogrid 31. The geogrid 31 provides a vertical fixing frame in the composite limiting layer 1 to evenly distribute the load. The fiberglass mesh 32 is bonded to the geogrid 31 with grout to form a crack-resistant barrier and inhibit the upward reflection of cracks in the old base course 4. At the same time, the geogrid 31 is laid on the old base course 4 with grout. The mesh structure of the geogrid 31 is interlocked with the old base course 4 with grout to improve the load-bearing capacity of the asphalt pavement on the old base course 4.

[0028] The composite stress-absorbing layer 2 is used to absorb and disperse stress, enhance crack resistance, and improve fatigue resistance. From bottom to top, the composite stress-absorbing layer 2 includes a lower asphalt binder layer 24, a three-dimensional randomized fiber layer 23, an upper asphalt binder layer 22, and a crushed stone layer 21. The randomized fiber layer is formed by multiple fine fibers evenly distributed in a randomized direction. The lower asphalt binder layer 24 provides initial bonding and buffering. The three-dimensional randomized fiber layer 23 forms a high-toughness mesh structure through randomized distribution, dispersing stress in multiple directions. The upper asphalt binder layer 22 further enhances bonding. The crushed stone layer 21 fills the pores in the lower asphalt binder layer 24, increasing the composite effect. The stress-absorbing layer 2 is rigid overall. The high-toughness fiber filaments of the three-dimensional random fiber layer 23 are evenly distributed and can absorb the micro-strain caused by repeated loading, preventing fatigue cracks in the composite stress-absorbing layer 2. The high-viscosity modified asphalt of the upper and lower asphalt binder layers provides flexible support. The crushed stone layer 21 can also enhance the overall stability. The three-dimensional random fiber layer 23 and the lower asphalt binder layer 24 are both embedded in the asphalt interlayer, forming an interlocking structure, which improves the shear resistance between layers. At the same time, the corrosion resistance of the fiber layer and the weather resistance of the asphalt binder can resist environmental erosion. The high compaction of the crushed stone layer 21 can ensure the rigidity of the structure to cope with dynamic loads and temperature changes.

[0029] Please refer to Figure 1 As shown, the fiberglass mesh 32 is bonded to the geogrid 31 by slurry. The slurry penetrates the mesh of the geogrid 31 to form a mechanical anchoring structure, thereby improving the shear strength between layers. At the same time, after the slurry is completely filled, the fiberglass mesh 32 forms a continuous and dense layer, reducing the permeability of the base layer.

[0030] Please refer to Figure 2 As shown, the slurry is a modified asphalt emulsion or polymer cement slurry. It utilizes its own strong adhesive force to ensure a tight bond between the fiberglass mesh 32 and the geogrid 31, improve the integrity of the composite restraint layer 1, and inhibit the expansion of cracks to extend the service life of the pavement.

[0031] Please refer to Figure 2 As shown, the geogrid 31 is a high-strength polyester geogrid 31, and its tensile strength is not less than 100kN / m. The high tensile strength is used to enhance the stability of the base layer.

[0032] Please refer to Figures 1-2 As shown, the lower asphalt binder layer 24 is made of high-viscosity modified asphalt. High-viscosity modified asphalt has strong adhesion, which can enhance the adhesion with the composite stress absorption layer 2 and the upper limiting layer, prevent slippage between layers, and resist deformation caused by high-frequency heavy load, keeping the road surface smooth. The thickness of the lower asphalt binder layer 24 is preferably 10-20mm.

[0033] Please refer to Figures 1-2As shown, the fiber filaments are polypropylene fibers or glass fibers, and their length is 10-30mm. They enhance the tensile strength of the three-dimensional random fiber layer 23 and resist road surface cracking. The fiber filaments form a random mesh structure, which absorbs the micro-strain caused by repeated loading to suppress fatigue cracks.

[0034] Please refer to Figure 2 As shown, the upper asphalt binder layer 22 is made of high-viscosity modified asphalt. The high-viscosity modified asphalt has strong adhesion, which can enhance the adhesion with the composite stress absorption layer 2 and the upper limiting layer, prevent slippage between layers, and resist deformation caused by high-frequency heavy load, keeping the road surface smooth. Its thickness is preferably 15-25mm.

[0035] Please refer to Figure 2 As shown, the crushed stone layer 21 has a crushed stone particle size of 5-10 mm and a compaction degree of not less than 98%.

[0036] Please refer to Figure 2 As shown, the surface layer 3 is high-modulus asphalt concrete.

[0037] Working principle of this utility model:

[0038] Pre-treatment of the old base layer 4, such as milling and cleaning, is carried out.

[0039] A high-strength polyester geogrid 31 is laid, a modified asphalt emulsion slurry is sprayed, and a fiberglass mesh 32 is covered to form a composite confinement layer 1.

[0040] After the composite limiting layer 1 is formed, high-viscosity modified asphalt lower layer binder is laid, and fiber filaments are sprayed to form a three-dimensional random fiber layer 23. High-viscosity modified asphalt upper layer binder is laid, and aggregate is spread and compacted to form a composite stress-absorbing layer 2. The lower asphalt binder layer 24, the three-dimensional random fiber layer 23, the upper asphalt binder layer 22, and the aggregate layer 21 can be laid simultaneously using paving equipment.

[0041] After the composite stress-absorbing layer 2 is formed, the surface layer 3 is laid to form a semi-flexible grouted asphalt pavement.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A high-performance semi-flexible grouting asphalt pavement for highway toll stations, laid on a pre-treated old base course, characterized in that, From bottom to top, it includes: a composite limiting layer (1), a composite stress absorbing layer (2), and a surface layer (3); The composite limiting layer (1) includes a geogrid (31) laid on the old base layer (4) and a fiberglass mesh (32) covering the geogrid (31); The composite stress-absorbing layer (2) consists of a lower asphalt binder layer (24), a three-dimensional random fiber layer (23), an upper asphalt binder layer (22), and a crushed stone layer (21) from bottom to top. The random fiber layer is formed by multiple fiber filaments randomly and uniformly distributed.

2. A high performance semi-flexible poured asphalt pavement for a highway toll booth according to claim 1, characterized in that: The fiberglass mesh (32) is bonded to the geogrid (31) by grout.

3. A high performance semi-flexible poured asphalt pavement for a highway toll booth according to claim 2, characterized in that: The slurry is a modified asphalt emulsion or a polymer cement slurry.

4. The high-performance semi-flexible grouting asphalt pavement for highway toll stations according to claim 1, characterized in that: The geogrid (31) is a high-strength polyester geogrid (31).

5. A high performance semi-flexible poured asphalt pavement for a highway toll booth according to claim 1, characterized in that: The lower asphalt binder layer (24) is made of high-viscosity modified asphalt with a thickness of 10-20 mm.

6. The high-performance semi-flexible grouting asphalt pavement for highway toll stations according to claim 1, characterized in that: The fiber filaments are polypropylene fibers or glass fibers, and their length is 10-30 mm.

7. The high-performance semi-flexible grouting asphalt pavement for highway toll stations according to claim 1, characterized in that: The upper asphalt binder layer (22) is made of high-viscosity modified asphalt with a thickness of 15-25 mm.

8. A high performance semi-flexible poured asphalt pavement for a highway toll booth according to claim 1, characterized in that: The gravel particle size of the gravel layer (21) is 5-10 mm.

9. A high performance semi-flexible poured asphalt pavement for a highway toll booth according to claim 1, characterized in that: The surface layer (3) is high-modulus asphalt concrete.

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