CN112359669A - Road intersection height anti-deformation road surface structure and method - Google Patents
Road intersection height anti-deformation road surface structure and method Download PDFInfo
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- CN112359669A CN112359669A CN202011127689.6A CN202011127689A CN112359669A CN 112359669 A CN112359669 A CN 112359669A CN 202011127689 A CN202011127689 A CN 202011127689A CN 112359669 A CN112359669 A CN 112359669A
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- 239000002131 composite material Substances 0.000 claims abstract description 26
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- 239000003795 chemical substances by application Substances 0.000 claims description 6
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
Abstract
The invention discloses a road intersection high-degree anti-deformation road surface structure and a method in the technical field of road engineering road surface structures, and aims to solve the technical problems that ruts are easy to deform and the structural durability is low at a road intersection. The pavement structure comprises a high-cohesiveness asphalt micro-top-coat wearing layer, a high-strength rigid-flexible composite material upper surface layer, a high-modulus asphalt middle surface layer, a modified asphalt lower surface layer and a cement stabilized macadam semi-rigid base layer from top to bottom, the surface layers are connected through modified emulsified asphalt bonding layers, and a high-elasticity asphalt stress absorbing layer is laid between the surface layers and the base layer. The pavement structure has high deformation resistance, long service life and high driving safety and comfort; meanwhile, the wearing layer is required to be maintained in daily life, the rapid and convenient maintenance method has the advantages of being rapid and convenient, the influence on traffic can be reduced to the maximum extent, and the maintenance of the use quality of the pavement is facilitated.
Description
Technical Field
The invention relates to the technical field of road engineering and discloses a road intersection high-altitude deformation-resistant road surface structure and a method.
Background
With the rapid development of the transportation industry of China, the traffic load borne by roads is heavier and heavier, and various diseases begin to be generated on the original asphalt pavement under the increasingly heavy traffic load action, particularly the deformation and the damage of the asphalt pavement at the road intersection are serious. Relevant studies have shown that: at a road intersection, the vehicle is frequently decelerated, stopped and accelerated, so that the asphalt pavement is subjected to a large horizontal load, the shear stress in the asphalt pavement is overlarge, and then deformation and damage occur. The proportion of deformation damage of road intersections in the damaged area of the road surface shows a trend of increasing year by year, and the deformation damage of the road intersections becomes an important object of maintenance and repair of the asphalt road surface. Therefore, the deformation resistance of the road surface of the road intersection is improved, the method has important significance for improving the safety, comfort and durability of the road, and is necessary requirement for the development of high-quality traffic facilities in China.
Accordingly, under the background of development of high-quality road traffic in China, how to design and provide a road intersection high-deformation-resistance road surface structure and method solves the problem that the road intersection is easy to deform and damage, improves the safety, comfort and durability of the road surface, and becomes a problem to be solved urgently. The invention patent of application No. 201920623152.5 discloses a crossing rut-preventing road surface reinforcing structure; the invention patent application No. 201810977917.5 discloses a road intersection rut resistant pavement structure and method. Above-mentioned patent is all adopts reinforced concrete slab in the basic unit, strengthens road surface basic unit structural strength to improve road surface structure bulk strength. However, from the viewpoint of mechanical properties, the reinforcing of the structural strength of the base course is beneficial to the improvement of the service life of the pavement, but the shear stress in the asphalt surface layer cannot be reduced, and even the trend is increased. Therefore, the method for improving the deformation and damage conditions of the asphalt pavement at the road intersection by adopting the mode of strengthening the strength of the base layer is yet to be further verified.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a road intersection high-degree anti-deformation road surface structure and a method, so as to solve the technical problem that the road intersection is easy to deform and damage.
In order to achieve the purpose, the technical scheme of the invention is as follows: a road intersection high anti-deformation pavement structure comprises a high cohesiveness asphalt micro-top surface wearing layer, a high-strength rigid-flexible composite material upper surface layer, a high-modulus asphalt middle surface layer, a modified asphalt lower surface layer and a cement stabilized macadam semi-rigid base layer which are sequentially arranged from top to bottom; the surface layers are connected by modified emulsified asphalt adhesive layers, and a high-elasticity asphalt stress absorption layer is laid between the surface layer and the base layer.
Preferably, the thickness of the high-cohesiveness asphalt micro-surfacing wearing layer is 12mm, and the void ratio is 4%; the thickness of the upper surface layer of the high-strength rigid-flexible composite material is 40-50 mm; the thickness of the surface layer in the high-modulus asphalt is 60-70 mm, the void ratio is 3-5%, and the SBS resin composite modified asphalt mastic broken stone mixture is adopted; the thickness of the lower surface layer of the modified asphalt is 80-90 mm, the void ratio is 3-5%, and the SBS modified asphalt mastic gravel mixture is adopted.
Preferably, the high cohesiveness asphalt micro-overlay wearing layer adopts a material with the water-soaking Marshall residual stability of not less than 90%, and the residual strength ratio of the freeze-thaw splitting test is not less than 90%.
Preferably, the high-cohesiveness asphalt micro-overlay wearing layer is made of high-cohesiveness modified asphalt and aggregates, and the mass percentage of the high-cohesiveness modified asphalt to the aggregates is 1: 13.33-1: 11.49; the high-cohesiveness modified asphalt comprises the following components in percentage by mass: 82-87% of No. 70 matrix asphalt, 5.3-10.3% of net structure type SBS modifier, 1.2-6.2% of resin rubber composite tackifier, 1.2-6.2% of plant light oil and 0.3% of non-amine anti-stripping agent; the maximum nominal aggregate size was 4.75mm and the percent passage of aggregate critical openings is shown in table 1.
TABLE 1 percent Key Aperture Range
Preferably, the high-strength rigid-flexible composite material adopted by the upper layer of the high-strength rigid-flexible composite material is prepared by pouring cement-based slurry into an asphalt mixture with a porosity of 25% -30%, the mass ratio of the asphalt to the cement-based slurry is 1: 5.15-1: 6.25, the dynamic stability of the high-strength rigid-flexible composite material at 60 ℃ is not lower than 60000 times/mm, and the Young modulus is not lower than 7000 MPa. )
Preferably, the thickness of the high-elasticity asphalt stress absorption layer is 10-15 mm, a sand-type high-elasticity modified asphalt mixture is adopted, and the 25-DEG C elasticity recovery rate of the adopted high-elasticity modified asphalt is not lower than 95%.
Preferably, the modified emulsified asphalt adhesive layer is an SBS modified emulsified asphalt adhesive layer, and the drawing strength of the SBS modified emulsified asphalt at 50 ℃ after demulsification is not lower than 0.05 MPa.
The method for preventing the road intersection from deforming at the high height is characterized in that the road intersection anti-deforming road surface structure is paved within 10 meters in front of an entrance lane parking mark line.
The pavement structure has high deformation resistance, long service life and high driving safety and comfort; meanwhile, the wearing layer is required to be maintained in daily life, the rapid and convenient maintenance method has the advantages of being rapid and convenient, the influence on traffic can be reduced to the maximum extent, and the maintenance of the use quality of the pavement is facilitated. Compared with the prior art, the invention has the beneficial technical effects that:
1. the invention can effectively prevent each structural layer from slipping by enhancing the cohesiveness among each layer of the pavement structure; meanwhile, the high-elasticity modified asphalt stress absorbing layer is adopted, so that the cracking of the semi-rigid base layer of the cement stabilized macadam can be effectively restrained and delayed, and further the deformation of the pavement caused by the cracking damage of the base layer is prevented.
2. According to the invention, the high-strength rigid-flexible composite material is adopted in the surface layer structure, so that the shear stress in the asphalt structure layer can be effectively reduced, the shear resistance of the asphalt structure layer is obviously enhanced, and the deformation damage of the asphalt structure layer due to insufficient shear resistance is restrained and delayed.
3. According to the invention, the high-cohesiveness asphalt micro-top wearing layer is laid on the high-strength rigid-flexible composite material, so that the driving comfort and safety of the road surface can be effectively improved; meanwhile, the wearing layer is required to be maintained in daily life, the rapid and convenient maintenance method has the advantages of being rapid and convenient, the influence on traffic can be reduced to the maximum extent, and the maintenance of the use quality of the pavement is facilitated.
Drawings
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
FIG. 2 is a schematic view of a fine structure of a high-strength rigid-flexible composite material;
FIG. 3 is a curved view of the maximum shear stress distribution in the asphalt structural layer in the area below the wheels under the same wheel load conditions for two road surface structures;
the asphalt cement mortar is characterized in that 1 is a high-cohesiveness asphalt micro-cover wearing layer, 2 is a high-strength rigid-flexible composite material upper surface layer, 3 is a high-modulus asphalt middle surface layer, 4 is a modified asphalt lower surface layer, 5 is a cement stabilized macadam semi-rigid base layer, 6 is formed by connecting the surface layers by modified emulsified asphalt bonding layers, 7 is formed by laying a high-elasticity asphalt stress absorbing layer between the surface layer and the base layer, 8 is asphalt mixture particles, and 9 is high-strength cement-based slurry.
Detailed Description
The invention provides a road intersection high-altitude deformation-resistant road surface structure and a method.
The examples described herein are specific embodiments of the present invention, are intended to illustrate the concept of the present invention, are exemplary, and are not intended to limit the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to utilize other embodiments which are obvious from the disclosure of the present patent application, including those which utilize any obvious substitutions or modifications to the embodiments described herein.
Some of the raw material sources used in the following examples are as follows: the No. 70 petroleum asphalt is medium petrochemical A-70 base asphalt; the light vegetable oil is vegetable asphalt prepared from castor oil, and is purchased from Alibah; the anti-stripping agent is kg80 anti-stripping agent provided by Shanghai Jiancheng trade company Limited.
Examples
Example 1: as shown in fig. 1, the road intersection high-deformation-resistance pavement structure comprises a high-cohesiveness asphalt micro-surfacing wearing layer 1, a high-strength rigid-flexible composite material upper surface layer 2, a high-modulus asphalt middle surface layer 3, a modified asphalt lower surface layer 4, a cement-stabilized macadam semi-rigid base layer 5, a modified emulsified asphalt bonding layer 6 adopted between the surface layers, and a high-elasticity asphalt stress absorption layer 7 paved between the surface layers and the base layer, which are sequentially arranged from top to bottom.
The thickness of the high-cohesiveness asphalt micro-mat wearing layer 1 is 12mm, the void ratio is 4%, the water-soaking Marshall residual stability of the material is 94%, and the ratio of the residual strength of the freeze-thaw splitting test is 91%.
The high-cohesiveness asphalt micro-overlay wearing layer is made of high-cohesiveness modified asphalt and aggregates in a mass percentage of 1: 13.33-1: 11.49, wherein the high-cohesiveness modified asphalt comprises the following components in percentage by mass: 84.5% of No. 70 matrix asphalt, 7.8% of a net structure type SBS modifier, 3.7% of a resin rubber composite tackifier, 3.7% of plant light oil and 0.3% of a non-amine anti-stripping agent; the maximum nominal particle size of the aggregate was 4.75 mm.
The thickness of the upper surface layer 2 of the high-strength rigid-flexible composite material is 40mm, the high-strength rigid-flexible composite material is prepared by pouring high-strength cement slurry produced by UNIKRETE company of France into asphalt mixture with the porosity of 30%, the mass ratio of asphalt to cement-based slurry is 1: 5.15-1: 6.25, the dynamic stability of the high-strength rigid-flexible composite material at 60 ℃ is 63000 times/mm, the Young modulus is 8000MPa, and the microstructure of the prepared high-strength rigid-flexible composite material is shown in figure 2.
The thickness of the surface layer 3 in the high-modulus asphalt is 60mm, the void ratio is 4%, and the SBS resin is adopted to modify the asphalt mastic broken stone mixture; the thickness of the lower surface layer 4 of the modified asphalt is 80mm, the void ratio is 4 percent, and the SBS modified asphalt mastic gravel mixture is adopted; the thickness of the semi-rigid cement stabilized macadam base 5 is 360 mm.
In other embodiments, the material of the surface layer 3 in the high-modulus asphalt is replaced by a modified asphalt mastic macadam mixture added with an anti-rutting agent.
The modified emulsified asphalt adhesive layer 6 adopts Firmzol emulsified asphalt material produced by Shanghai city-built Nippon asphalt Co; the thickness of the high-elasticity asphalt stress absorption layer 7 is 12mm, a sand-type high-elasticity modified asphalt mixture is adopted, and the 25 ℃ elasticity recovery rate of the adopted high-elasticity modified asphalt is 99%;
the utility model provides a road intersection height resistance to deformation road surface structure lays this road surface structure in the import lane, promptly in the 10 meters within range before the import lane parking marking lay this road surface structure.
As shown in fig. 3, the maximum shear stress distribution curve diagram in the asphalt structure layer in the area below the wheels is shown under the same wheel load condition (vertical load 0.7Mpa, horizontal force coefficient 0.5). Wherein, 1 is the curved surface picture of the pavement structure of the invention, 2 is the curved surface picture of the general bituminous pavement structure, obviously, compared with general bituminous pavement structure 2, the shear stress value in the bituminous structural layer of the pavement structure 1 of the invention is obviously reduced, thus can promote the anti-deformability of the pavement structure by a wide margin, lengthen the service life of the pavement structure.
The operation and use method of the pavement structure comprises the following steps:
the invention provides a high-performance pavement structure by means of enhancing continuity among layers, enhancing strength of an upper surface layer, improving surface layer functionality, prolonging service life of a semi-rigid base layer and the like; in addition, the pavement structure has the characteristics of quickness and convenience in pavement maintenance. Above, effectively solved the road intersection entrance lane bituminous paving and easily taken place the deformation problem of damaging, can ensure the high-quality service level of this department road surface.
Through a large amount of pavement structure mechanics computational analysis and pavement deformation damage field investigation, the main reasons for deformation damage of the asphalt pavement at the road intersection comprise three aspects: the shear stress in the asphalt surface layer is overlarge; the cohesiveness between asphalt surface layers and between the surface layers and the base layer is insufficient; structural deformation damage from damage to the substrate, where excessive shear stress is the primary cause of deformation. In recent years, with the development of material technology, high-performance cement-based slurry is generated, and a composite material with high rigidity and flexibility is developed on the basis of the high-performance cement-based slurry, so that the composite material has high deformation resistance, but is dense and high in rigidity, and has poor driving comfort, slip resistance and noise reduction capability, and therefore, the safety and comfort of the whole pavement can be improved by additionally paving a micro-cover wearing layer on the composite material; the laying of the stress absorption layer can enhance the bonding between the surface layer and the base layer, protect the base layer structure and be beneficial to prolonging the service life of the base layer.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art are all covered by the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A road intersection high anti-deformation pavement structure comprises a high cohesiveness asphalt micro-top surface wearing layer, a high-strength rigid-flexible composite material upper surface layer, a high-modulus asphalt middle surface layer, a modified asphalt lower surface layer and a cement stabilized macadam semi-rigid base layer which are sequentially arranged from top to bottom; the surface layers are connected by modified emulsified asphalt adhesive layers, and a high-elasticity asphalt stress absorption layer is laid between the surface layer and the base layer.
2. The road intersection high deformation-resistant pavement structure according to claim 1, characterized in that: the thickness of the high-cohesiveness asphalt micro-surfacing wearing layer is 12mm, and the void ratio is 4%; the thickness of the upper surface layer of the high-strength rigid-flexible composite material is 40-50 mm; the thickness of the surface layer of the high-modulus asphalt is 60-70 mm, the void ratio is 3-5%, and the SBS resin is adopted to compositely modify the asphalt mastic broken stone mixture; the thickness of the lower surface layer of the modified asphalt is 80-90 mm, the void ratio is 3-5%, and the SBS modified asphalt mastic gravel mixture is adopted.
3. The road intersection high deformation-resistant pavement structure according to claim 1, characterized in that: the high-cohesiveness asphalt micro-mat wearing layer is made of a material with a soaking Marshall residual stability of not less than 90% and a freeze-thaw cleavage test residual strength ratio of not less than 90%.
4. The road intersection high deformation-resistant pavement structure according to claim 1, characterized in that: the high-cohesiveness asphalt micro-surfacing wearing layer is made of high-cohesiveness modified asphalt and aggregates, and the mass percentage of the high-cohesiveness modified asphalt to the aggregates is 1: 13.33-1: 11.49; the high-cohesiveness modified asphalt comprises the following components in percentage by mass: 82-87% of No. 70 matrix asphalt, 5.3-10.3% of a net structure type SBS modifier, 1.2-6.2% of a resin rubber composite tackifier, 1.2-6.2% of plant light oil and 0.3% of a non-amine anti-stripping agent; the maximum nominal particle size of the aggregate was 4.75 mm.
5. The road intersection high deformation-resistant pavement structure according to claim 1, characterized in that: the high-strength rigid-flexible composite material adopted by the upper layer of the high-strength rigid-flexible composite material is prepared by pouring cement-based slurry into an asphalt mixture with the porosity of 20-30%, the mass ratio of the asphalt to the cement-based slurry is 1: 5.15-1: 6.25, the dynamic stability of the high-strength rigid-flexible composite material at 60 ℃ is not lower than 60000 times/mm, and the Young modulus is not lower than 7000 MPa.
6. The road intersection high deformation-resistant pavement structure according to claim 1, characterized in that: the thickness of the stress absorption layer of the high-elasticity asphalt is 10-15 mm, a sand-type high-elasticity modified asphalt mixture is adopted, and the 25 ℃ elasticity recovery rate of the adopted high-elasticity modified asphalt is not lower than 95%.
7. The road intersection high deformation-resistant pavement structure according to claim 1, characterized in that: the modified emulsified asphalt adhesive layer is an SBS modified emulsified asphalt adhesive layer, and the drawing strength of the SBS modified emulsified asphalt at 50 ℃ after demulsification is not lower than 0.05 MPa.
8. A method for preventing deformation of a road intersection height is characterized by comprising the following steps: the road intersection high-degree anti-deformation road surface structure of claims 1-7 is paved within 10 meters in front of an entrance lane parking mark line.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113062166A (en) * | 2021-03-26 | 2021-07-02 | 中交路桥建设有限公司 | Covering method for transverse road intersection |
| CN113462177A (en) * | 2021-07-08 | 2021-10-01 | 江苏聚科特新材料科技有限公司 | Polymer composite modified asphalt and highway pavement structure thereof |
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| CN113462177A (en) * | 2021-07-08 | 2021-10-01 | 江苏聚科特新材料科技有限公司 | Polymer composite modified asphalt and highway pavement structure thereof |
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