Multifunctional polymer reactive base layer durable pavement structure

Abstract

The utility model discloses a multifunctional durable pavement structure with a polymer reactive base layer. A high-viscosity drainage asphalt concrete upper surface layer, a first asphalt waterproof bonding layer, a high-performance asphalt concrete middle surface layer, a second asphalt waterproof bonding layer, a modified asphalt concrete lower surface layer, a high-performance waterproof bonding layer, an asphalt stabilized macadam upper base layer, a high-shear-strength graded macadam lower base layer and a cement stabilized macadam upper subbase layer are sequentially arranged from top to bottom. A cement stabilized macadam lower subbase layer, a graded macadam layer and a roadbed; and the high-shear-strength graded broken stone lower base layer is a high-performance polymer HPM cemented graded broken stone base layer. Layered structures in the pavement structure are selected, and various different layered structures are matched with one another, so that the problem of reflection cracks generally existing in a semi-rigid base layer can be effectively solved, the durability of the pavement is improved, and the service life of the pavement is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of pavement structures, in particular to a multifunctional polymer reactive base durable pavement structure capable of suppressing reflective cracks. Background Art

[0002] The pavement structure of highways generally includes roadbed, semi-rigid base and surface layer. The main types of defects include rutting, cracking, oil spilling, and water damage potholes. Among them, reflective cracks in the semi-rigid base are the most important defects; this type of defect seriously affects the service life of asphalt pavement. One of the main reasons for this type of defect is the unreasonable design of the pavement structure, weak bearing capacity, poor durability, and difficulty in reaching the expected design service life.

[0003] In view of the above-mentioned defects, the prior art uses sealing materials to solve the problem of cracks in the pavement base, such as "A method for repairing cracks in a water-stable base in a pavement structure" with application publication number CN115125790A, which discloses that after the construction of the water-stable base is completed, a drilling device is provided, and a plurality of holes are opened at intervals on the cracks of the water-stable base by using the drilling device, and the plurality of holes are distributed at intervals along the length direction of the crack; a sealing material is provided, and the sealing material is dripped into the holes so that the sealing material penetrates and fills the crack; a self-adhesive anti-cracking sticker is provided, and the self-adhesive anti-cracking sticker is adhered and fixed to the crack along the length direction of the crack to seal the crack, but the process is relatively cumbersome.

[0004] At present, some patents in the prior art also disclose composite pavement structures with different structural forms for suppressing base cracks, such as "a composite pavement structure containing polypropylene fiber material" with authorization announcement number CN219568510U, which includes: a first pavement unit, an asphalt pavement body, a first glass fiber polyester anti-cracking cloth, asphalt concrete, a second pavement unit, a second glass fiber polyester anti-cracking cloth, polypropylene fiber concrete, a first polyester geotextile, a third pavement unit, lime sand soil, a second polyester geotextile and a gravel cushion layer. The gravel cushion layer cooperates with the lime sand soil to support the second pavement unit and the first pavement unit, solving the brittleness problem of the current semi-rigid base material; such as "a new type of crack-resistant composite pavement structure" with authorization announcement number CN219709972U, which includes: a lower layer, an adhesive layer and an upper layer are laid in sequence from bottom to top, and tie rods are fixedly installed on both sides of the roadbed skeleton, and the tie rods are pre-buried in the base of the unit pavement module, and a shoulder block is laid at the shoulder, and the end of the tie rod is connected to the shoulder block. That is, the above patents also disclose composite pavement structures for suppressing base cracks in different structural forms. It can be seen that this type of design has various forms and has great room for development.

[0005] Therefore, how to create a base durable pavement structure that is different from the prior art, has a novel structure and can suppress reflective cracks has become a goal that the industry urgently needs to improve. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a multifunctional polymer reactive base durable pavement structure which is different from the prior art, has a novel structure and can inhibit reflective cracks, thereby overcoming the shortcomings of the prior art.

[0007] In order to solve the above technical problems, the utility model provides a multifunctional polymer reactive base durable pavement structure, wherein the pavement structure comprises, from top to bottom, a high-viscosity drainage asphalt concrete upper layer, a first asphalt waterproof bonding layer, a high-performance asphalt concrete middle layer, a second asphalt waterproof bonding layer, a modified asphalt concrete lower layer, a high-performance waterproof bonding layer, an asphalt stabilized gravel upper base layer, a high shear strength graded gravel lower base layer, a cement stabilized gravel upper subbase layer, a cement stabilized gravel lower subbase layer, a graded gravel layer and a roadbed; the high shear strength graded gravel lower base layer adopts a high-performance polymer HPM bonded graded gravel base layer.

[0008] As a further improvement of the utility model, the upper layer of high-viscosity drainage asphalt concrete adopts high-viscosity drainage asphalt concrete PAC-13 with a thickness of 4-6cm; the middle layer of high-performance asphalt concrete adopts high-performance asphalt concrete GAC-20 with a thickness of 6-8cm; the lower layer of modified asphalt concrete adopts SBS modified asphalt concrete GAC-25 with a thickness of 8-10cm.

[0009] Furthermore, the first asphalt waterproof bonding layer and the second modified asphalt waterproof bonding layer are SBS modified asphalt waterproof bonding layer, modified emulsified asphalt waterproof bonding layer or rubber powder modified asphalt waterproof bonding layer; the dosage of the first asphalt waterproof bonding layer is 1.6-2.0kg / m 2 The dosage of the second modified asphalt waterproof bonding layer is 1.8-2.2kg / m 2 .

[0010] Furthermore, the asphalt-stabilized gravel upper base layer adopts an ATB-25 asphalt-stabilized gravel layer with a thickness of 8-14 cm.

[0011] Furthermore, the high performance polymer HPM bonded graded crushed stone base is filled with water-based road polymer SRX with a thickness of 14-20 cm.

[0012] Furthermore, the thickness of the cement-stabilized crushed stone upper base layer is 20-25 cm; the thickness of the cement-stabilized crushed stone lower base layer is 25-30 cm.

[0013] Furthermore, the graded crushed stone layer between the cement-stabilized crushed stone subbase and the roadbed has a thickness of 15-20 cm.

[0014] Furthermore, the roadbed adopts modified special cement to improve the reinforcement layer with a thickness of 25-30cm.

[0015] Furthermore, the pavement structure is a pavement structure for double lanes.

[0016] By adopting the above technical solution, the utility model has at least the following advantages:

[0017] 1. The utility model selects the layered structure above the base layer in the pavement structure, and a variety of different layered structures cooperate with each other, which can effectively improve the pavement base cracks on the expressway and solve the reflection cracks.

[0018] 2. In addition, by using high-performance polymer HPM to bond the base layer and setting up a combination of improved roadbed and base layer, the cracking of the base layer and other defects can be avoided, thus extending the service life of the road surface.

[0019] 3. The multifunctional polymer reactive base durable pavement structure of the utility model for suppressing reflective cracks adopts a high-performance polymer HPM bonded graded crushed stone base, which is a high shear strength graded crushed stone base with stronger performance. At the same time, it gives full play to the advantages of different high-performance asphalt materials and can ensure a service life of more than 30 years.

[0020] 4. During the design life, the pavement structure of the utility model will not produce structural damage and reflective cracks. It only needs daily maintenance and does not require major repairs to the main load-bearing layer, which significantly reduces the cost of road repair and maintenance. The multifunctional polymer reactive base durable pavement structure that inhibits reflective cracks established by the utility model can also effectively improve pavement durability, driving safety and comfort, save life cycle costs, and reduce the time of traffic congestion caused by maintenance, which has very important social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 This is a schematic diagram of a multifunctional polymer reactive base durable pavement structure for suppressing reflective cracks of the utility model;

[0023] Description of reference numerals:

[0024] 1-high-viscosity drainage asphalt concrete upper layer; 2-first asphalt waterproof bonding layer; 3-high-performance asphalt concrete middle layer; 4-second asphalt waterproof bonding layer; 5-modified asphalt concrete lower layer; 6-high-performance waterproof bonding layer; 7-asphalt stabilized gravel upper base layer; 8-high shear strength graded gravel lower base layer; 9-cement stabilized gravel upper subbase layer; 10-cement stabilized gravel lower subbase layer; 11-graded gravel layer; 12-roadbed. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0026] This embodiment provides a multifunctional polymer reactive base durable pavement structure that suppresses reflective cracks, which is applied to double lanes of highways.

[0027] like Figure 1 As shown, the multifunctional polymer reactive base durable pavement structure for suppressing reflective cracks provided in this embodiment comprises, from top to bottom, a high-viscosity drainage asphalt concrete upper layer 1, a first asphalt waterproof bonding layer 2, a high-performance asphalt concrete middle surface layer 3, a second asphalt waterproof bonding layer 4, a modified asphalt concrete lower layer 5, a high-performance waterproof bonding layer 6, an asphalt-stabilized gravel upper base layer 7, a high-shear strength graded gravel lower base layer 8, a cement-stabilized gravel upper subbase layer 9, a cement-stabilized gravel lower subbase layer 10, a graded gravel layer 11 and a roadbed 12.

[0028] The high-viscosity drainage asphalt concrete upper layer 1 adopts high-viscosity drainage asphalt concrete PAC-13, with a thickness of 4-6cm, which can be 4cm, 5cm, 6cm, and 4cm is preferred in this example. PAC is high-viscosity drainage asphalt concrete. The performance indicators of the mixture of the high-viscosity drainage asphalt concrete upper layer 1 are: 60℃ dynamic stability ≥5000 times / mm; residual stability ≥85%, freeze-thaw residual strength ratio ≥85%; scattering ≤15%; immersion scattering ≤20%; water permeability coefficient ≥5000mL / min; dynamic compression modulus is

[0029] ≥9000Mpa.

[0030] The high-performance asphalt concrete middle surface layer 3 adopts high-performance asphalt concrete GAC-20, with a thickness of 6-8 cm, which can be 6 cm, 7 cm, 8 cm, and 6 cm is preferred in this example. Among them, AC-20 represents that the nominal maximum particle size of the asphalt concrete is 20.

[0031] The modified asphalt concrete lower layer 5 is SBS modified asphalt concrete GAC-25, with a thickness of 8-10 cm, which can be 8 cm, 9 cm, 10 cm, and 8 cm is preferred in this example. AC-25 represents that the nominal maximum particle size of the asphalt concrete is 25.

[0032] The first asphalt waterproof bonding layer 2 and the second asphalt waterproof bonding layer 4 are both SBS modified asphalt waterproof bonding layers, and can also be modified emulsified asphalt waterproof bonding layers, or rubber powder modified asphalt waterproof bonding layers. The first asphalt waterproof bonding layer 2 is used to bond the high-viscosity drainage asphalt concrete upper layer 1 and the high-performance asphalt concrete middle layer 3, and the dosage is 1.6-2.0kg / m 2 The second asphalt waterproof bonding layer 4 is used to bond the high-performance asphalt concrete middle surface layer 3 and the modified asphalt concrete lower layer 5, with a dosage of 1.8-2.2kg / m 2 .

[0033] The asphalt stabilized gravel upper base 7 adopts ATB-25 asphalt stabilized gravel layer with a thickness of 8-14cm, which can be 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm, and 8cm is preferred in this example. ATB-25 represents the nominal maximum particle size of asphalt concrete is 25. Index requirements: dynamic modulus> 10000Mpa.

[0034] The high shear strength graded gravel subbase 8 adopts a high-performance polymer HPM bonded graded gravel base; in this example, the high-performance polymer HPM bonded graded gravel base is preferably filled with a water-based road polymer SRX. SRX is a polymer solution mixed with a variety of special pressure-sensitive resins and a variety of organic additives. It is not a derivative of petroleum. The SRX water-based polymer material can be dissolved in water and evenly dispersed on the surface of stable granular materials such as soil and stone with water as the conductive medium. After paving this new mixture, the effective compaction process is accompanied by a large amount of water volatilization. After the SRX polymer solution and the graded gravel are mixed, an organic mucous film is formed on the surface of the soil and stone solid particles inside the road structure layer, which is firmly bonded to form a high-performance polymer HPM road polymer gravel base with a certain integrity. The HPM road polymer polymer gravel base has the characteristics of high strength, low modulus, strong toughness, etc.; its rebound modulus can generally reach more than 750MPa. The thickness is 14-20cm, which can be 14cm, 15cm, 16cm, 17cm, 18cm, 19cm, 20cm. In this example, 14cm is preferred. The 14cm HPM high shear strength graded crushed stone subbase can replace the water-stabilizing layer to solve the reflective cracking problem commonly existing in the semi-rigid base, inhibit the reflective cracking of the base, and strengthen the construction control. Index requirements: dynamic stability of the rutting plate> 10000 times / mm, when the compaction degree is 98%, CBR≥250%.

[0035] The thickness of the cement stabilized crushed stone upper subbase 9 is 20-25 cm, which can be 20 cm, 21 cm, 22 cm, 23 cm, 24 cm, 25 cm, and 20 cm is preferred in this example. Index requirements: unconfined compressive strength 4-6 Mpa.

[0036] The thickness of the cement stabilized crushed stone subbase 10 is 25-30 cm, which can be 25 cm, 26 cm, 27 cm, 28 cm, 29 cm, 30 cm, and 25 cm is preferred in this example. Index requirements: unconfined compressive strength 4-6 Mpa.

[0037] A graded crushed stone layer 11 is used between the cement-stabilized crushed stone lower subbase 10 and the roadbed 12, with a thickness of 15-20 cm, which can be 15 cm, 16 cm, 17 cm, 18 cm, 19 cm, 20 cm, and 15 cm is preferred in this example.

[0038] The roadbed 12 uses modified special cement to improve the reinforcement layer, with a thickness of 25-30 cm, which can be 25 cm, 26 cm, 27 cm, 28 cm, 29 cm, 30 cm, and 25 cm is preferred in this example. Special cement is added to solidify the soil, thereby improving the overall resistance of the road surface.

[0039] In summary, the utility model adopts a variety of asphalt mixtures with different gradations, uses a variety of different asphalts, and uses a high-performance polymer HPM for a high-shear graded crushed stone layer. It combines the comprehensive advantages of high-performance polymer bonded base, graded crushed stone, and asphalt mixture, and gives full play to the advantages of different high-performance asphalt materials. It can suppress reflective cracks in the semi-rigid base, improve the durability of the road surface, and extend the life of the road surface.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which are all within the protection scope of the present invention.

Claims

1. A multifunctional polymer reactive base durable pavement structure, characterized in that: The pavement structure is, from top to bottom, a high-viscosity drainage asphalt concrete upper layer, a first asphalt waterproof bonding layer, a high-performance asphalt concrete middle layer, a second asphalt waterproof bonding layer, a modified asphalt concrete lower layer, a high-performance waterproof bonding layer, an asphalt stabilized gravel upper base layer, a high shear strength graded gravel lower base layer, a cement stabilized gravel upper subbase layer, a cement stabilized gravel lower subbase layer, a graded gravel layer and a roadbed; the high shear strength graded gravel lower base layer adopts a high-performance polymer HPM cemented graded gravel base layer.

2. The multifunctional polymer reactive base durable pavement structure according to claim 1, characterized in that: The top layer of the high-viscosity drainage asphalt concrete is made of high-viscosity drainage asphalt concrete PAC-13, with a thickness of 4-6 cm; The high-performance asphalt concrete middle surface layer adopts high-performance asphalt concrete GAC-20 with a thickness of 6-8 cm; The modified asphalt concrete lower layer adopts SBS modified asphalt concrete GAC-25 with a thickness of 8-10 cm.

3. The multifunctional polymer reactive base durable pavement structure according to claim 2, characterized in that: The first asphalt waterproof bonding layer and the second modified asphalt waterproof bonding layer are SBS modified asphalt waterproof bonding layer, modified emulsified asphalt waterproof bonding layer or rubber powder modified asphalt waterproof bonding layer; the dosage of the first asphalt waterproof bonding layer is 1.6-2.0kg / m 2 The dosage of the second modified asphalt waterproof bonding layer is 1.8-2.2kg / m 2 .

4. The multifunctional polymer reactive base durable pavement structure according to claim 3, characterized in that: The asphalt-stabilized crushed stone upper base layer adopts an ATB-25 asphalt-stabilized crushed stone layer with a thickness of 8-14 cm.

5. The multifunctional polymer reactive base durable pavement structure according to any one of claims 1 to 4, characterized in that: The thickness of the high performance polymer HPM bonded graded crushed stone base layer is 14-20 cm.

6. The multifunctional polymer reactive base durable pavement structure according to claim 5, characterized in that: The thickness of the cement-stabilized crushed stone upper base layer is 20-25 cm; the thickness of the cement-stabilized crushed stone lower base layer is 25-30 cm.

7. The multifunctional polymer reactive base durable pavement structure according to claim 6, characterized in that: The graded crushed stone layer between the cement-stabilized crushed stone lower subbase and the roadbed has a thickness of 15-20 cm.

8. The multifunctional polymer reactive base durable pavement structure according to claim 7, characterized in that: The roadbed adopts modified special cement to improve the reinforcement layer with a thickness of 25-30cm.

9. The multifunctional polymer reactive base durable pavement structure according to claim 1, characterized in that: The pavement structure is a pavement structure for double lanes.

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