Composite asphalt concrete pavement structure based on RUHPC
By introducing a composite asphalt concrete layer based on RUHPC into the pavement structure, the problem that traditional asphalt pavement cannot meet the requirements of modern roads under complex traffic and environmental conditions is solved, and the road surface is highly compressive, durable and resource-saving effects are achieved.
Patent Information
- Application Number
- CN202421239116.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-06-03
AI Technical Summary
When traditional asphalt pavement faces complex and changing traffic loads and environmental conditions, it cannot meet the comprehensive requirements of modern road traffic for load-bearing strength, long-term durability, comprehensive safety performance and economy, especially on road sections with large longitudinal slopes, there are problems such as rut formation, cracks, and water damage.
The composite asphalt concrete pavement structure based on RUHPC is adopted, including a surface layer, a base layer and a base layer. The surface layer is composed of asphalt layer, an adhesive layer and an ultra-high performance concrete layer. The ultra-high performance concrete layer is composed of cement, composite blends, quartz sand, high-efficiency water reducer, gravel and steel fibers, and has high compressive strength, bending strength and elastic modulus.
It significantly improves the damage resistance and durability of the road surface, extends the service life of the road, reduces material consumption and environmental burden, saves raw materials, reduces carbon emissions, and achieves the goal of efficient resource utilization and low-carbon environmental protection.
Smart Images
Figure CN222575157U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of road engineering, and in particular relates to a composite asphalt concrete pavement structure based on RUHPC. Background Art
[0002] In the current field of road construction, asphalt pavement has become the preferred solution for high-grade road paving because of its good road surface flatness, easy construction and maintenance, and high-quality driving experience. However, with the continuous growth of transportation volume and the continuous improvement of pavement performance requirements, traditional asphalt pavement faces a series of challenges, including but not limited to rutting, cracks, damage caused by water damage, and potholes, which seriously affect the safety, traffic capacity and maintenance costs of roads.
[0003] Although significant progress has been made in materials science and engineering technology, pavement structures that rely on a single material such as ordinary cement or standard asphalt cannot fully meet the comprehensive requirements of modern road traffic for load-bearing strength, long-term durability, comprehensive safety performance, and economy when dealing with complex and changing traffic loads and environmental conditions. The above problems are particularly prominent in sections with large longitudinal slopes, which puts higher requirements on the design of pavement structures and material selection. Summary of the invention
[0004] The purpose of the embodiment of the utility model is to provide a composite asphalt concrete pavement structure based on RUHPC to improve the damage resistance of the pavement and extend the service life of the road.
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is a composite asphalt concrete pavement structure based on RUHPC, including a surface layer, a base layer and a subbase layer. The surface layer is composed of an asphalt layer, a bonding layer and an ultra-high performance concrete layer from top to bottom, the base layer is composed of cement-stabilized gravel with a mass fraction of 5% to 6%, and the subbase layer is composed of cement-stabilized gravel with a mass fraction of 4% to 5%.
[0006] Furthermore, the surface layer has a thickness of 4 to 10 cm.
[0007] Furthermore, the thickness of the asphalt layer is 2 to 5 cm, and the asphalt layer is modified asphalt concrete. The specific components of the modified asphalt concrete include SBS-70# road petroleum asphalt, limestone crushed rock, and mineral powder.
[0008] Furthermore, the ultra-high performance concrete layer has a thickness of 2 to 5 cm, a compressive strength of ≥120 MPa, a flexural strength of ≥12 MPa, and an elastic modulus of ≥40 GPa.
[0009] Furthermore, the total thickness of the ultra-high performance concrete layer and the bonding layer is 3 to 6 cm.
[0010] Furthermore, the ultra-high performance concrete layer includes cement, composite admixtures, quartz sand, high-efficiency water reducing agent, crushed stone, and steel fiber.
[0011] Furthermore, the specific components of the bonding layer include modified emulsified asphalt and crushed stone.
[0012] Furthermore, the modified emulsified asphalt is 0.9-1.1 kg / ㎡, the crushed stone particle size is 9.5-13.2 mm, the crushed stone is embedded in the modified emulsified asphalt to a depth of 1 / 2; the crushed stone spreading area accounts for 50% of the modified emulsified asphalt area.
[0013] The beneficial effects of the utility model are:
[0014] The utility model road structure uses a layer of ultra-high performance concrete (RUHPC) material for roads, which shows significant performance improvement and resource saving potential compared with traditional asphalt pavement structures. The RUHPC layer effectively suppresses rutting deformation with its high modulus characteristics, prevents fatigue cracking with high tensile strength, and reduces water damage with excellent compactness, significantly enhancing the durability and comprehensive performance of the road. This innovative design optimizes the pavement structure layer, simplifies the traditional multi-layer into a RUHPC lower layer and an AC upper layer, so that the overall thickness of the surface layer can be maintained in a relatively thin range of 4 to 10 cm. Compared with the original 14-18 cm asphalt concrete surface layer thickness, it saves 1 / 2 to 2 / 3 of raw materials, significantly reducing material consumption and environmental burden. The thickness design of the utility model RUHPC layer is flexible and adaptable. In the range of 2 to 5 cm, the base and roadbed structure maintain the original design, ensuring the integrity and functional stability of the pavement structure; and it can greatly replace the base thickness, making the overall pavement structure significantly lighter, further reducing the amount of raw materials used, and reducing carbon footprint. The utility model not only embodies the pursuit of efficient utilization of resources, but also actively responds to the development trend of low-carbon and environmental protection, and demonstrates the technological progress and sustainable advantages of the utility model in the field of road construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 It is a three-dimensional structural diagram of the composite asphalt pavement according to this embodiment.
[0017] Figure 2 It is a schematic diagram of the cross section of the composite asphalt pavement according to this embodiment.
[0018] Figure 3 It is a schematic diagram of the bonding layer of the composite asphalt pavement according to this embodiment.
[0019] In the figure, 1, surface layer; 2, base layer; 3, subbase layer; 11, asphalt layer; 12, bonding layer; 13, ultra-high performance concrete layer; 121, crushed stone; 122, modified emulsified asphalt. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] like Figures 1 to 3 The utility model provides a composite asphalt concrete pavement structure based on RUHPC, which mainly includes a surface layer 1, a base layer 2, and a subbase layer 3 laid from top to bottom; wherein the surface layer 1 has a thickness of 4 to 10 cm, and is composed of an asphalt layer 11, an adhesive layer 12, and an ultra-high performance concrete layer 13 from top to bottom. The asphalt layer 11 is paved with modified asphalt concrete. In this embodiment, the modified asphalt concrete is composed of SBS-70# road petroleum asphalt, limestone crushed rock, and mineral powder, with an oil-stone ratio of 5.04% and a thickness of 2 to 5 cm; the ultra-high performance concrete layer 13 has a thickness of 2 to 5 cm, a compressive strength of ≥120 MPa, a flexural strength of ≥12 MPa, and an elastic modulus of ≥40 GPa. In this embodiment, the ultra-high performance concrete (RUHPC) used in the ultra-high performance concrete layer 13 has good strength, toughness, and crack resistance, and can withstand a large vehicle load, thereby avoiding excessive damage to the road surface, reducing the number of major and medium repairs of the road surface during its service life, extending the service life of the road, and reducing the full life cycle cost of the road. Comprehensive fatigue life analysis, road performance analysis and full life cycle cost analysis show that the total thickness of the bonding layer 12 and the ultra-high performance concrete layer 13 is 3 to 6 cm, which can achieve better road performance and economic benefits. In this embodiment, the main components of ultra-high performance concrete (RUHPC) are cement, composite admixture, quartz sand, high-efficiency water reducing agent, crushed stone and steel fiber.
[0022] The bonding layer is to quickly embed the crushed stone 121 before the initial setting of the ultra-high performance concrete layer 13, and apply the modified emulsified asphalt 122 after the curing is completed; the amount of modified emulsified asphalt 122 is 0.9-1.1 kg / ㎡, and the interface roughening is selected to embed the crushed stone 121 with a particle size of 9.5-13.2 mm, the crushed stone 121 is embedded to a depth of 1 / 2, and the spreading area of the crushed stone 121 is 50%. This embodiment compares the shear strength of the three particle size ranges of 2.36-4.75 mm, 4.75-9.5 mm, and 9.5-13.2 mm. The results show that if a smaller particle size of crushed stone 121 is used, the shear effect between layers is not obvious. The shear strength increases with the increase of particle size. At a particle size of 9.5-13.2 mm, the shear strength increases the most with the increase of the spreading area. When the spreading area is 50%, the shear strength of the three sizes of embedded stones increases the most; therefore, in this embodiment, the interface roughening selects crushed stones 121 with a particle size of 9.5 to 13.2 mm for embedding, the embedding depth of the crushed stones 121 is 1 / 2, and the spreading area of the crushed stones 121 is 50%. The modified emulsified asphalt 122 uses SBS modified asphalt, which comprehensively considers the shear strength, tensile strength and economic benefits of the structure.
[0023] In some possible implementations, the base layer 2 is composed of cement-stabilized crushed stone 121 with a mass fraction of 5% to 6%, and the subbase layer 3 is composed of cement-stabilized crushed stone 121 with a mass fraction of 4% to 5%.
[0024] Compared with the conventional asphalt pavement structure, this embodiment adopts a layer of ultra-high performance concrete (RUHPC) material for roads. The advantages of the RUHPC layer, such as high modulus resistance to rutting deformation, high tensile strength resistance to bending fatigue cracking, and high compactness resistance to water damage, significantly improve its durability and road performance. The three layers of the conventional high-grade asphalt pavement, namely the upper layer, the middle layer, and the lower layer, are changed into two layers, namely the AC upper layer and the RUHPC lower layer. The total thickness of the surface layer 1 is reduced from the original about 14-18cm to about 4-10cm, saving about 1 / 2-2 / 3 of the amount of raw materials. The fatigue life of the surface layer 1 structure can be increased by more than 5 times, reaching the long-life structure life standard; the three layers of AC layers constructed at high temperature are changed into one layer of AC layers constructed at high temperature and one layer of RUHPC layers constructed at normal temperature, reducing the carbon emissions of the AC layer construction by more than 60%. When the thickness of the RUHPC layer is ≥5cm, the functions of the base layer 2 and the roadbed structure layer remain unchanged, the thickness of the overall pavement structure layer can be greatly reduced, the amount of raw materials used is greatly reduced, and the carbon emissions are further reduced.
[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims
1. A composite asphalt concrete pavement structure based on RUHPC, comprising a surface layer (1), a base layer (2) and a subbase layer (3), characterized in that: The surface layer (1) is composed of an asphalt layer (11), an adhesive layer (12), and an ultra-high performance concrete layer (13) from top to bottom; the base layer (2) is composed of cement-stabilized crushed stone (121) with a mass fraction of 5% to 6%; and the subbase layer (3) is composed of cement-stabilized crushed stone (121) with a mass fraction of 4% to 5%.
2. A composite asphalt concrete pavement structure based on RUHPC according to claim 1, characterized in that: The surface layer (1) has a thickness of 4 to 10 cm.
3. A composite asphalt concrete pavement structure based on RUHPC according to claim 1, characterized in that: The asphalt layer (11) has a thickness of 2 to 5 cm.
4. The composite asphalt concrete pavement structure based on RUHPC according to claim 1, characterized in that: The ultra-high performance concrete layer (13) has a thickness of 2 to 5 cm, a compressive strength of ≥120 MPa, a flexural strength of ≥12 MPa, and an elastic modulus of ≥40 GPa.
5. The composite asphalt concrete pavement structure based on RUHPC according to claim 1, characterized in that: The total thickness of the ultra-high performance concrete layer (13) and the bonding layer (12) is 3 to 6 cm.
6. The composite asphalt concrete pavement structure based on RUHPC according to claim 1, characterized in that: The bonding layer (12) comprises modified emulsified asphalt (122) and crushed stone (121).
7. The composite asphalt concrete pavement structure based on RUHPC according to claim 6, characterized in that: The modified emulsified asphalt (122) has a concentration of 0.9-1.1 kg / m2, the crushed stone (121) has a particle size of 9.5-13.2 mm, and the crushed stone (121) is embedded to a depth of 1 / 2 of the modified emulsified asphalt (122); the spreading area of the crushed stone (121) accounts for 50% of the area of the modified emulsified asphalt (122).