CN218932757U - Asphalt pavement structure based on sandstone gravel base layer - Google Patents
Asphalt pavement structure based on sandstone gravel base layer Download PDFInfo
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- CN218932757U CN218932757U CN202222635896.3U CN202222635896U CN218932757U CN 218932757 U CN218932757 U CN 218932757U CN 202222635896 U CN202222635896 U CN 202222635896U CN 218932757 U CN218932757 U CN 218932757U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to the technical field of road engineering, in particular to an asphalt pavement structure based on a sandstone macadam foundation. Comprising the following steps: cement stabilized macadam base; the graded broken stone base layer is paved on the cement stabilized sandstone broken stone base layer; the transparent layer is paved on the graded broken stone sandstone base layer; an asphalt surface layer paved on the permeable layer; wherein the aggregate of the cement stabilized macadam base layer is sandstone macadam, and the cement stabilized macadam base layer adopts a cement stabilized macadam mixture CTB-30; the aggregate of the graded broken stone base layer is sandstone graded broken stone, the graded broken stone base layer is graded broken stone granule base layer, and the CBR strength is not less than 260. The asphalt pavement structure enables expressway projects with abundant sandstone resources along the lines to be available locally, utilizes sandstone rubble to pave a road base layer, saves cost, ensures the progress and quality of the projects, and has obvious economic and social benefits for fully utilizing the resources and protecting the environment.
Description
Technical Field
The utility model relates to the technical field of road engineering, in particular to an asphalt pavement structure based on a sandstone macadam foundation.
Background
With the rapid development of road transport network construction, more and more roads need investment construction, and the demand for road construction materials is continuously increasing, especially high-quality materials. At present, the cement stabilized macadam base layer in the highway industry generally adopts stones such as limestone, granite, gravel and the like, and the stones generally have higher strength and better crushing value, so that the technical requirements of semi-rigid base layer paving on materials can be met. Considering the lack of high-quality raw materials along the highway in partial areas, the situation of serious shortage of building stones is faced, and the high cost of material transportation and purchasing makes engineering cost difficult to bear. In order to shorten the transportation distance of materials, save engineering cost, ensure the progress and quality of projects, the road construction materials along the project should be utilized as much as possible, and natural resources should be fully developed and utilized.
Aiming at highways with abundant sandstone resources along the lines, taking nearby materials and cost reduction as starting points, the utility model provides an asphalt pavement structure based on a sandstone macadam base layer, which has great significance for fully utilizing resources and protecting environment from the viewpoints of meeting engineering properties of road raw materials and aggregates and mechanical property technology and durability technical requirements of cement stabilized macadam.
Disclosure of Invention
In view of the above, the utility model aims to provide an asphalt pavement structure based on a sandstone macadam base layer, which can fully utilize sandstone resources along a highway, reduce material cost and has good stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an asphalt pavement structure based on a sandstone gravel base layer, comprising:
cement stabilized macadam base;
the graded broken stone base layer is paved on the cement stabilized sandstone broken stone base layer;
the transparent layer is paved on the graded broken stone sandstone base layer;
an asphalt surface layer paved on the permeable layer;
wherein the aggregate of the cement stabilized macadam base layer is sandstone macadam, and the cement stabilized macadam base layer adopts cement stabilized macadam mixture CTB-30 (CTB is cement stabilized macadam for short; 30 is grading type);
the aggregate of the graded broken stone base layer is sandstone graded broken stone; the graded broken stone base layer is a graded broken stone granular base layer, and the CBR strength is not less than 260.
By adopting the inverted asphalt pavement structure base layer of the cement stabilized macadam base layer and the sandstone graded macadam base layer, sandstone macadam resources can be effectively utilized, and meanwhile, the pavement structure has excellent anti-reflection crack performance.
Preferably, in the above asphalt pavement structure, the cement stabilized macadam base is divided into two layers, wherein,
the thickness of the lower layer is 16-20cm, and the cement consumption of the lower layer is 3.4-3.6%;
the thickness of the upper layer is 16-20cm, and the cement consumption of the upper layer is 3.9-4.1%. The cement stabilized macadam base adopts an upper layer structure and a lower layer structure with the thickness and the cement consumption, so that the cost can be effectively saved on the basis of ensuring the bearing strength.
Further preferably, a lateral gradient of dumping from the middle to two sides of the road is arranged on one side of the upper layer of the cement stabilized macadam base layer, which is close to the graded macadam base layer, and the lateral gradient is more than 1.0%, so that a small amount of water of the graded macadam base layer can be conveniently collected and discharged to two sides.
Preferably, in the asphalt pavement structure, the thickness of the graded broken stone base layer is 16 cm-18 cm.
Preferably, in the asphalt pavement structure, the penetrating layer is a mixed layer formed by penetrating emulsified asphalt into the upper part of the graded broken stone base layer, and the thickness of the penetrating layer is 10-15 mm, so that the effects of consolidation, sealing and water resistance are achieved.
Further preferably, the emulsified asphalt is a high penetration modified emulsified asphalt.
Preferably, in the above-mentioned asphalt pavement structure, the asphalt surface layer is divided into three layers,
wherein, the liquid crystal display device comprises a liquid crystal display device,
the lower layer adopts asphalt mixture ATB-30 with the thickness of 7cm to 9cm;
the middle surface layer adopts asphalt mixture AC-20 with the thickness of 5cm to 7cm;
the upper layer adopts asphalt mixture SMA-13 with the thickness of 3-5 cm.
Further preferably, the lower surface layer and the middle surface layer are connected by adopting a modified emulsified asphalt bonding layer, and the middle surface layer and the upper surface layer are connected by adopting a modified emulsified asphalt bonding layer.
The beneficial effects obtained by the utility model are as follows:
aiming at the expressway construction project with rich sandstone resources along the line, the bituminous pavement structure based on the sandstone macadam base layer provided by the utility model can fully utilize sandstone macadam along the line of the project to lay the road base layer, shortens the transportation distance of materials, saves the engineering cost, ensures the progress and quality of the project, and has obvious economic and social benefits for fully utilizing the resources and protecting the environment.
Drawings
Fig. 1 is a schematic structural view of a pavement structure according to embodiment 1 of the present utility model; wherein, the lower floor of 1-cement stabilized macadam basic unit, the upper strata of 2-cement stabilized macadam basic unit, 3-graded macadam basic unit, 4-penetrating layer, the lower floor of 5-asphalt surface course, the middle surface course of 6-asphalt surface course, the upper surface course of 7-asphalt surface course.
Detailed Description
In order to facilitate the understanding of the present utility model, the following description of the asphalt pavement structure based on the sandstone-based layer, as described in the present utility model, is provided with reference to the accompanying drawings and examples, but is not intended to limit the scope of the present utility model.
Example 1
This embodiment provides an asphalt pavement structure based on sandstone rubble basic unit, as shown in fig. 1, includes:
cement stabilized macadam base;
a graded broken stone base layer 3 paved on the cement stabilized sandstone broken stone base layer;
a permeable layer 4 paved on the graded broken stone sandstone base layer 3;
an asphalt surface layer paved on the permeable layer 4;
wherein the aggregate of the cement stabilized macadam base layer is sandstone macadam, and the cement stabilized macadam base layer adopts a cement stabilized macadam mixture CTB-30; the cement mortar is divided into an upper layer and a lower layer, wherein the thickness of the lower layer 1 is 18cm, and the cement consumption of the lower layer 1 is 3.5%; the thickness of the upper layer 2 is 18cm, and the cement consumption of the upper layer 2 is 4.0%;
the upper layer 2 of the cement stabilized macadam base is provided with a transverse gradient which is inclined from the middle to two sides of a road and is arranged at 1.5% on one side close to the graded macadam base 3;
aggregate of the graded broken stone base layer 3 is sandstone graded broken stone, the graded broken stone base layer 3 is graded broken stone granular base layer, CBR strength is 286, and grading range meets the requirements of Table 1; the thickness of the graded broken stone base layer 3 is 16cm;
TABLE 1 sandstone graded crushed stone aggregate grading Range requirement
The permeable layer 4 is a mixed layer formed by permeation of high-permeation modified emulsified asphalt into the upper part of the graded broken stone base layer 3, and the thickness of the permeable layer 4 is 10mm;
the asphalt surface layer is divided into three layers, wherein,
the lower layer 5 adopts asphalt mixture ATB-30 with the thickness of 8cm;
the middle surface layer 6 adopts asphalt mixture AC-20 with the thickness of 6cm;
the upper layer 7 adopts asphalt mixture SMA-13 with the thickness of 4cm;
the lower layer 5 is connected with the middle layer 6 by adopting a modified emulsified asphalt bonding layer, and the middle layer 6 is connected with the upper layer 7 by adopting a modified emulsified asphalt bonding layer.
While the utility model has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (8)
1. An asphalt pavement structure based on a sandstone gravel base layer, comprising:
cement stabilized macadam base;
the graded broken stone base layer is paved on the cement stabilized sandstone broken stone base layer;
the transparent layer is paved on the graded broken stone sandstone base layer;
an asphalt surface layer paved on the permeable layer;
wherein the aggregate of the cement stabilized macadam base layer is sandstone macadam, and the cement stabilized macadam base layer adopts a cement stabilized macadam mixture CTB-30;
the aggregate of the graded broken stone base layer is sandstone graded broken stone, the graded broken stone base layer is graded broken stone granule base layer, and the CBR strength is not less than 260.
2. The asphalt pavement structure based on a sandstone gravel base according to claim 1, wherein the cement stabilized macadam base is divided into two layers, wherein,
the thickness of the lower layer is 16-20cm, and the cement consumption of the lower layer is 3.4-3.6%;
the thickness of the upper layer is 16-20cm, and the cement consumption of the upper layer is 3.9-4.1%.
3. The asphalt pavement structure based on a sandstone macadam base according to claim 2, wherein the upper layer of the cement stabilized macadam base is provided with a transverse gradient inclined from the middle of the road to two sides on one side near the graded macadam base, and the transverse gradient is set to be more than 1.0%.
4. The asphalt pavement structure based on a sandstone gravel base according to claim 1, wherein the graded gravel base has a thickness of 16cm to 18cm.
5. The asphalt pavement structure based on a sandstone macadam base according to claim 1, wherein the penetrating layer is a mixed layer formed by penetrating emulsified asphalt into the upper part of the graded macadam base, and the thickness of the penetrating layer is 10-15 mm.
6. The sandstone-based asphalt pavement structure of claim 5, wherein the emulsified asphalt is a high-permeability modified emulsified asphalt.
7. The asphalt pavement structure based on a sandstone-based layer according to claim 1, wherein the asphalt pavement layer is divided into three layers, wherein,
the lower layer adopts asphalt mixture ATB-30 with the thickness of 7cm to 9cm;
the middle surface layer adopts asphalt mixture AC-20 with the thickness of 5cm to 7cm;
the upper layer adopts asphalt mixture SMA-13 with the thickness of 3-5 cm.
8. The asphalt pavement structure based on sandstone macadam base according to claim 7, wherein the lower surface layer and the middle surface layer are connected by a modified emulsified asphalt bonding layer, and the middle surface layer and the upper surface layer are connected by a modified emulsified asphalt bonding layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222600312 | 2022-09-29 | ||
| CN2022226003129 | 2022-09-29 |
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| Publication Number | Publication Date |
|---|---|
| CN218932757U true CN218932757U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222635896.3U Active CN218932757U (en) | 2022-09-29 | 2022-10-08 | Asphalt pavement structure based on sandstone gravel base layer |
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- 2022-10-08 CN CN202222635896.3U patent/CN218932757U/en active Active
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