High-temperature-resistant cold-recycled asphalt pavement structure
By using modified cold recycled asphalt mixtures and special structural layer design, the problem of easy deformation of asphalt pavement under high temperature is solved, realizing efficient recycling of old materials and resistance to deformation under high temperature, and reducing construction difficulty and cost.
Patent Information
- Application Number
- CN202422941710.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-30
AI Technical Summary
Traditional asphalt pavements are prone to deformation problems such as rutting under high temperature conditions, and old materials are not effectively utilized, resulting in resource waste and environmental pollution.
The modified cold recycled asphalt mixture and special structural layer design, including modified emulsified asphalt tack coat and fiberglass grid, are adopted to form a stable skeleton structure and high viscosity binder, optimize the stress transfer between pavement layers and enhance the pavement's resistance to deformation at high temperatures.
It effectively reduces road surface deformation and damage under high temperatures, improves the road surface's elastic recovery ability under high temperatures, reduces construction difficulty and cost, and achieves efficient recycling of old materials.
Smart Images
Figure CN223522928U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to road surface structure technical field, concretely is a kind of high-temperature-resistant cold recycling asphalt pavement structure. BACKGROUND
[0002] With the construction of a large number of roads and the growth of service life, the amount of old asphalt pavement materials is increasing. If these old materials are not effectively utilized, it will cause huge resource waste. Cold recycling technology can recycle old asphalt pavement materials and reduce the demand for new aggregates and asphalt. The old asphalt pavement materials generated by road repair each year amount to hundreds of millions of tons, and cold recycling technology provides an effective way for the reasonable disposal of these old materials.
[0003] Traditional road repair methods, such as discarding old asphalt pavement materials, not only waste resources but also may cause environmental pollution. The storage of old asphalt pavement materials may occupy land, and harmful substances such as asphalt may seep into soil and water bodies.
[0004] The high-temperature-resistant cold recycling asphalt pavement structure can effectively reduce the occurrence of diseases by improving the high-temperature resistance of the pavement, thereby reducing the maintenance cost of the road. Road diseases need to be repaired regularly, which consumes a lot of manpower, material resources and financial resources.
[0005] In high-temperature areas, ordinary asphalt pavement is prone to deformation problems such as rutting. This is because the viscosity of asphalt decreases at high temperatures, and under the repeated action of vehicle load, the asphalt mixture produces irreversible deformation. With the development of economy, the traffic flow in high-temperature areas is increasing, especially the proportion of heavy vehicles is also rising. Traditional asphalt pavement structure is difficult to withstand the dual pressure of increasing traffic load and high-temperature environment. SUMMARY
[0006] To solve the above problems, the utility model provides a high-temperature-resistant cold recycling asphalt pavement structure.
[0007] To achieve the above object, the utility model provides the following technical scheme: A kind of high-temperature-resistant cold regeneration asphalt pavement structure, including soil base, graded broken stone bottom base layer is laid on the upper end of the soil base, cold regeneration cement stabilized broken stone base is laid on the upper end of the graded broken stone bottom base layer, functional layer is laid on the upper end of the cold regeneration cement stabilized broken stone base, modified cold regeneration asphalt mixture lower layer is laid on the upper end of the functional layer, second modified emulsified asphalt adhesive layer is bonded with the upper end of the modified cold regeneration asphalt mixture lower layer, modified cold regeneration asphalt mixture middle surface layer is bonded with the upper end of the modified cold regeneration asphalt mixture lower layer by second modified emulsified asphalt adhesive layer, first modified emulsified asphalt adhesive layer is equipped on the upper end of the modified cold regeneration asphalt mixture middle surface layer, modified asphalt surface layer is bonded with the upper end of the modified cold regeneration asphalt mixture middle surface layer by first modified emulsified asphalt adhesive layer;
[0008] The functional layer includes a seal coat, a fiberglass grid, and a penetration layer, which are arranged in order from top to bottom.
[0009] Preferably, the modified asphalt surface layer generally uses fine-grained asphalt mixture, and the material of the modified asphalt surface layer is styrene, butadiene and styrene block copolymer modified asphalt.
[0010] Preferably, the modified cold regeneration asphalt mixture middle surface layer uses medium-grained cold regeneration asphalt mixture, which is prepared by adding appropriate amount of new aggregate, new asphalt binder and additives to the old asphalt pavement material after recycling and crushing.
[0011] Preferably, the modified cold regeneration asphalt mixture lower layer uses coarse-grained cold regeneration asphalt mixture, which uses skeleton dense type grading, and the coarse aggregate is embedded and extruded to form a stable skeleton structure.
[0012] Preferably, the cold regeneration cement stabilized broken stone base is formed by rearranging the aggregate in the old pavement material after crushing and stirring by cold regeneration equipment.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] 1. The road structure formed by the gradation enables the pavement to provide stronger interlocking at high temperatures, so that the aggregates support each other, reduce the flow deformation of the asphalt mixture, and the aggregate combination with intermittent gradation is adopted, the coarse aggregate forms a skeleton structure, and the fine aggregate fills the voids, which can effectively resist the lateral deformation caused by the vehicle load at high temperatures, and meanwhile, the binder is specially modified, the modified binder has higher viscosity at high temperatures, can better bond the aggregates together, and prevent the aggregates from displacement at high temperatures, so that the pavement does not easily appear rutting, displacement and other diseases even in the case of high temperature.
[0015] 2. The pavement structure can maintain good elastic recovery capacity at high temperatures, the deformation of the pavement when the vehicle passes can be quickly recovered after the vehicle load disappears, and the accumulation of permanent deformation is reduced, and in addition, by optimizing the pavement structure layer combination, a special stress absorbing layer or bonding layer is arranged between the pavement layers under high temperature stress, which can effectively transfer and disperse the stress, avoid the separation or sliding between the layers at high temperatures, and thus relieve the interlayer diseases caused by high temperatures.
[0016] 3. The pavement structure has a high recycling rate for the recycling of old pavement materials, can process old asphalt materials with different aging degrees and properties, and can flexibly adjust the performance of the mixture according to the needs during the recycling process, and the cold recycling process operation is relatively simple, and does not need complex high-temperature heating equipment, and it can be operated at normal temperature, such as milling, crushing, adding regenerant and new materials, stirring and the like, which reduces the construction difficulty and cost. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a schematic view of the overall structure of the utility model;
[0018] Figure 2 It is a front view schematic view of the utility model.
[0019] The figure mark description: 1, modified asphalt surface layer; 2, first modified emulsified asphalt adhesive layer; 3, modified cold recycled asphalt mixture middle surface layer; 4, second modified emulsified asphalt adhesive layer; 5, modified cold recycled asphalt mixture lower surface layer; 6, functional layer; 7, cold recycled cement stabilized macadam base layer; 8, graded gravel bottom base layer; 61, seal coat; 62, glass fiber grid; 63, primer. DETAILED DESCRIPTION
[0020] The embodiment of the utility model will be further described in detail in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.
[0021] Please refer to Figure 1 and Figure 2The application discloses a high-temperature-resistant cold recycling asphalt pavement structure, which comprises a soil foundation, a graded gravel bottom base layer 8 is arranged on the upper end of the soil foundation, a cold recycling cement stabilized gravel base layer 7 is arranged on the upper end of the graded gravel bottom base layer 8, a functional layer 6 is arranged on the upper end of the cold recycling cement stabilized gravel base layer 7, a modified cold recycling asphalt mixture lower layer 5 is arranged on the upper end of the functional layer 6, and the modified cold recycling asphalt mixture lower layer 5 adopts coarse-grained cold recycling asphalt mixture. In the design of the coarse-grained cold recycling asphalt mixture, it is very important to reasonably control the gradation of the aggregate. The skeleton dense type gradation is adopted, the coarse aggregate is embedded and extruded to form a stable skeleton structure, stress can be effectively dispersed when the load is borne at high temperature, and the rut depth is reduced. Meanwhile, in order to further improve the high-temperature-resistant performance, a high-temperature-resistant additive can be added, the adhesion between the asphalt and the aggregate is improved, the overall performance of the mixture is improved, the upper end of the modified cold recycling asphalt mixture lower layer 5 is bonded with a second modified emulsified asphalt adhesive layer 4, the upper end of the modified cold recycling asphalt mixture lower layer 5 is bonded with a modified cold recycling asphalt mixture middle layer 3 through the second modified emulsified asphalt adhesive layer 4, the middle-grained cold recycling asphalt mixture is adopted, and the cold recycling asphalt mixture is prepared by recycling and crushing old asphalt pavement materials and adding appropriate new aggregate, new asphalt binder and additives. In the cold recycling asphalt mixture of the middle layer, the high-temperature-resistant performance can be enhanced by adding fiber materials such as lignin fiber or polyester fiber. The fiber forms a network structure in the mixture, the anti-deformation capacity of the mixture is improved, the asphalt is prevented from flowing and the aggregate is prevented from being loose at high temperature, the upper end of the modified cold recycling asphalt mixture middle layer 3 is provided with a first modified emulsified asphalt adhesive layer 2, the first modified emulsified asphalt adhesive layer 2 and the second modified emulsified asphalt adhesive layer 4 are thin asphalt layers for improving the bonding performance between the asphalt layers and between the asphalt layer and the cement concrete pavement. The main function is to improve the interlayer bonding capacity, so that the overall strength of the pavement structure layers is formed, and the pavement shear deformation is resisted, the upper end of the modified cold recycling asphalt mixture middle layer 3 is bonded with a modified asphalt surface layer 1 through the first modified emulsified asphalt adhesive layer 2, the modified asphalt surface layer 1 usually adopts fine-grained asphalt mixture, in order to improve the high-temperature-resistant performance, modified asphalt, SBS modified asphalt is selected, the modified asphalt has high viscosity at high temperature, can effectively resist the shear force in the process of vehicle driving, and reduces the formation of diseases. In the area where the air temperature is often higher than 30 DEG C, the dynamic stability of the SBS modified asphalt surface layer can be increased by more than 50% than that of the ordinary asphalt surface layer, a stress absorbing layer with high bonding capacity is arranged between the recycled asphalt base layer and the surface layer, the stress absorbing layer can effectively transfer load stress, prevent the horizontal force caused by vehicle braking or acceleration at high temperature from causing interlayer sliding, and ensure that the whole pavement structure bears force cooperatively.
[0022] Please refer to Figure 1 and Figure 2The functional layer 6 comprises a sealing layer 61, a glass fiber grid 62 and a transparent layer 63, which are arranged in sequence from top to bottom. The glass fiber grid 62 has high tensile strength and low elongation, no long-term creep, good physical and chemical stability, good thermal stability, anti-fatigue cracking, high-temperature rut resistance, low-temperature shrinkage resistance, delay and reduction of reflection cracks, can enhance and reinforce the pavement, prevent pavement rutting fatigue cracks, thermal and cold expansion cracks and underlying reflection cracks, and can disperse the bearing stress of the pavement to prolong the service life of the pavement. The sealing layer 61 is a thin layer of asphalt and gravel provided for sealing surface voids and preventing water intrusion. The lower sealing layer is paved below the asphalt surface layer and on the surface of the base layer. The main function of the lower sealing layer is to seal water and prevent and absorb reflection cracks in the base layer. The transparent layer 63 is used to combine the asphalt surface layer and the semi-rigid base layer well. The transparent layer is formed by spraying emulsified asphalt on the base layer to a certain depth of the base layer surface. Its main function is to penetrate the sprayed liquid into the non-asphalt material base layer to promote the mutual adhesion of different media.
[0023] Please refer to Figure 1 and Figure 2 The cold recycled cement stabilized gravel base layer 7 and the graded gravel sub-base layer 8 refer to the use of old pavement materials such as asphalt pavement or cement pavement milling materials, adding a certain proportion of stabilizers such as cement, emulsified asphalt, new aggregate and water at room temperature, and using special cold recycling equipment for mixing, crushing, compaction and other processes to re-form a road base layer with certain strength and stability.
[0024] The aggregate in the old pavement material is rearranged to form a compact structure after crushing and mixing by the cold recycling equipment. For example, in the process of re-mixing the gravel in the old asphalt pavement, large-diameter gravel is embedded and extruded, and small-diameter gravel fills the voids, forming a relatively stable skeleton structure.
[0025] When the stabilizer such as cement is added, the cement undergoes hydration reaction when it comes into contact with water, and the generated hydration products bond the aggregate together. The products such as hydrated calcium silicate gel fill the voids between the aggregate, increasing the cohesion and stability of the material. If emulsified asphalt is used as a stabilizer, the emulsified asphalt breaks down, and the asphalt wraps the aggregate, playing a role in bonding and waterproofing. The semi-rigid base layer is the main load-bearing layer of the pavement, and the semi-rigid sub-base layer is the auxiliary load-bearing layer of the pavement. These two structural layers provide the required overall load-bearing capacity for the semi-rigid pavement. The above various materials are paved on the roadbed to form a layered structure, which together forms a high-temperature-resistant cold-recycled asphalt pavement structure for vehicle travel.
[0026] During the cold recycling process, the old asphalt pavement material can be effectively treated. The aging problem of old asphalt can be improved by adding a recycling agent. The recycling agent can penetrate into the old asphalt, restoring its flexibility and adhesion. For example, certain recycling agents contain special chemical components that can decompose oxidation products in old asphalt, allowing old asphalt to regain better rheological properties.
[0027] At the same time, the gradation of the mixture can be adjusted as needed during the recycling process, and new aggregates such as basalt, limestone, etc. can be added to improve the overall strength and stability of the mixture. The newly added aggregates and the recycled old material complement each other to form a cold recycled asphalt mixture with excellent performance. The cold recycled asphalt pavement structure takes into account the fatigue performance of the pavement under repeated vehicle loads during design. By optimizing the composition and structure of the mixture, the elasticity and toughness of the pavement are improved. A certain proportion of elastic materials such as rubber powder is added to the mixture, which can absorb and release energy under vehicle loads, reducing stress concentration inside the pavement, thereby improving the fatigue resistance of the pavement. Under long-term traffic loads, especially in high-temperature seasons, the pavement is subjected to large stress changes, and the fatigue resistance of the cold recycled asphalt pavement structure can effectively prevent premature cracking and other diseases of the pavement.
[0028] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the present application, which is defined by the appended claims and their equivalents.
Claims
1. A high temperature resistant cold recycled asphalt pavement structure comprising a subbase, characterized in that: The upper end of the soil base is paved with a graded gravel bottom base layer (8), the upper end of the graded gravel bottom base layer (8) is paved with a cold recycled cement stabilized gravel base layer (7), the upper end of the cold recycled cement stabilized gravel base layer (7) is paved with a functional layer (6), the upper end of the functional layer (6) is paved with a modified cold recycled asphalt mixture lower surface layer (5), the upper end of the modified cold recycled asphalt mixture lower surface layer (5) is bonded with a second modified emulsified asphalt adhesive layer (4), the upper end of the modified cold recycled asphalt mixture lower surface layer (5) is bonded with a modified cold recycled asphalt mixture middle surface layer (3) through the second modified emulsified asphalt adhesive layer (4), the upper end of the modified cold recycled asphalt mixture middle surface layer (3) is provided with a first modified emulsified asphalt adhesive layer (2), and the upper end of the modified cold recycled asphalt mixture middle surface layer (3) is bonded with a modified asphalt surface layer (1) through the first modified emulsified asphalt adhesive layer (2). The functional layer (6) comprises a sealing layer (61), a glass fiber grid (62) and a penetrating layer (63), and the sealing layer (61), the glass fiber grid (62) and the penetrating layer (63) are sequentially distributed from top to bottom.
2. The high temperature resistant cold recycled asphalt pavement structure according to claim 1, characterized in that: The modified asphalt surface layer (1) adopts fine-grained asphalt mixture, and the material of the modified asphalt surface layer (1) is styrene, butadiene and styrene block copolymer modified asphalt.
3. The high temperature resistant cold recycled asphalt pavement structure according to claim 1, characterized in that: The modified cold recycled asphalt mixture lower surface layer (5) adopts coarse-grained cold recycled asphalt mixture, the coarse-grained cold recycled asphalt mixture adopts a skeleton dense type grading, and the coarse aggregate is embedded and extruded to form a stable skeleton structure.
4. The high temperature resistant cold recycled asphalt pavement structure according to claim 1, characterized in that: The cold recycled cement stabilized gravel base layer (7) is formed by rearranging the aggregate in the old pavement material through crushing and stirring by a cold recycling device.