Dust-free pavement structure suitable for desert area

Abstract

The utility model provides a dust-free pavement structure suitable for a desert area. The utility model provides a dust-free pavement structure suitable for a desert area, which comprises an aeolian sand subgrade base layer, a geotechnical cloth isolating layer, an aeolian sand composite natural gravel cement gelling dust-free pavement layer and a nano silane-based coating which are sequentially arranged on the top surface of an old subgrade, the aeolian sand composite natural gravel cement stabilized soil composite edge covering layers are arranged on the surfaces of the two sides of the old roadbed. According to the utility model, the aeolian sand composite natural gravel cement gelling dust-free pavement layer and the aeolian sand composite natural gravel cement stabilized soil composite edge covering layer are arranged on the surface layer of the old roadbed, a rigid protective shell is formed through cement solidification, the old roadbed reinforcing layer (namely the nano silane-based coating) enhances the cohesiveness of sand grains, and the geotechnical cloth isolating layer disperses stress, so that the stability of the old roadbed is improved. And the aeolian sand subgrade base layer absorbs deformation, and multi-layer synergistic wind erosion resistance and dust falling are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dustless pavement structure suitable for desert area. BACKGROUND

[0002] In desert area, the traditional pavement structure often faces the following problems: 1) serious wind erosion: loose aeolian sand is easy to be carried by wind, leading to roadbed hollowing and pavement collapse; 2) dust pollution: dust is formed under the action of vehicle rolling and wind, affecting the environment and traffic safety; 3) insufficient stability: the conventional sand and gravel base has poor combination with desert sand, and is easy to produce cracks and settlement. In the prior art, the pavement structure using single sand and gravel or cement stabilized soil material is difficult to adapt to the desert environment. In addition, the traditional geotextile isolation layer is easy to be damaged under long-term wind and sand impact, leading to structure failure. Therefore, there is an urgent need for a pavement structure suitable for desert environment. SUMMARY

[0003] The utility model provides a dustless pavement structure suitable for desert area.

[0004] The utility model sets aeolian sand composite natural sand and gravel cement gel dustless pavement layer and aeolian sand composite natural sand and gravel cement stabilized soil composite bound layer on the surface of old road roadbed, which forms rigid protective shell through cement solidification, enhances sand particle adhesion through old road roadbed reinforcement layer (namely nano silane base coating), disperses stress through geotextile isolation layer, and absorbs deformation through aeolian sand roadbed base layer, realizing multi-layer synergistic wind erosion and dust reduction.

[0005] The utility model provides a dustless pavement structure suitable for desert area, which comprises aeolian sand roadbed base layer, geotextile isolation layer, aeolian sand composite natural sand and gravel cement gel dustless pavement layer and nano silane base coating arranged on the top surface of old road roadbed in sequence, and aeolian sand composite natural sand and gravel cement stabilized soil composite bound layer arranged on the surface of both sides of the old road roadbed.

[0006] In the dustless pavement structure suitable for desert area, the thickness of the nano silane base coating can be 3mm, the nano silane base coating invades the aeolian sand composite natural sand and gravel cement gel dustless pavement layer, and enhances water resistance and sand particle adhesion.

[0007] In the dustless pavement structure suitable for desert area, the thickness of the aeolian sand composite natural sand and gravel cement gel dustless pavement layer can be 23cm.

[0008] In the dustless pavement structure suitable for desert area, the aeolian sand roadbed base layer can be 50-80cm.

[0009] In the dustless pavement structure suitable for desert area, the aeolian sand composite natural sand and gravel cement stabilized soil composite bound layer can be 10cm.

[0010] In the dust-free pavement structure suitable for desert areas, the compaction degree of the material for forming the aeolian sand composite natural gravel cement gel dust-free pavement layer is 95% to 100%, and the aeolian sand, the natural gravel and the cement are mixed in proportion and then compacted to form the high-density base.

[0011] In the dust-free pavement structure suitable for desert areas, the aeolian sand composite natural gravel cement gel dust-free pavement layer is also made of aeolian sand composite natural gravel containing 4% cement in mass percentage.

[0012] In the dust-free pavement structure suitable for desert areas, the aeolian sand composite natural gravel cement gel dust-free pavement layer is also made of aeolian sand composite natural gravel containing 4% cement in mass percentage.

[0013] In the dust-free pavement structure suitable for desert areas, the aeolian sand composite natural gravel cement gel dust-free pavement layer is also made of aeolian sand composite natural gravel containing 4% cement in mass percentage.

[0014] (1) clean the original old road subgrade, and compact the aeolian sand subgrade base;

[0015] (2) lay geotextile as a geotextile isolation layer on the aeolian sand subgrade base, and the edge overlap width of two adjacent geotextiles is greater than or equal to 30 cm;

[0016] (3) layer by layer fill the aeolian sand and natural gravel and cement mixture on the geotextile isolation layer, and compact to form the aeolian sand composite natural gravel cement gel dust-free pavement layer;

[0017] (4) spray the nanometer silane-based coating on the aeolian sand composite natural gravel cement gel dust-free pavement layer;

[0018] (5) lay the aeolian sand composite natural gravel cement stabilized soil composite cover layer on the surfaces of the two sides of the old road subgrade, mechanically compact and maintain for 7 days.

[0019] The dust-free pavement structure suitable for desert areas has the following beneficial effects:

[0020] (1) dust-free: the cement aeolian sand composite cover layer adopts cement and natural gravel combination to form a rigid shell, effectively fixes sand particles and reduces vehicle rolling dust;

[0021] (2) wind erosion resistance: the nanometer silane-based coating penetrates into the sand particle gap to form a hydrophobic film, reduces the loosening of sand particles caused by water evaporation, and the nanometer silane-based coating and the rigid surface layer jointly resist wind and sand erosion, prolonging the service life;

[0022] (3) multi-layer structure synergy: the geotextile isolation layer and the aeolian sand subgrade base jointly improve the anti-deformation ability;

[0023] (4) Low cost: The aeolian sand subgrade base layer is used as the foundation layer, and local aeolian sand is used as the main material to reduce transportation and raw material costs;

[0024] (5) Environmental protection: Reduces the spread of sand and dust and improves the ecological environment in desert areas. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the dust-free road surface structure applicable to desert areas according to this utility model.

[0026] The markings in the diagram are as follows:

[0027] 1. Cement-aeolian sand composite edging layer; 2. Nano-silane coating; 3. Aeolian sand composite natural gravel water-stabilized base course; 4. Geotextile isolation layer; 5. Aeolian sand subgrade base course; 6. Old road subgrade. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0029] This utility model provides a dust-free road surface structure suitable for desert areas, such as... Figure 1 As shown, the roadbed includes, in sequence, the following layers on the top surface of the old roadbed: aeolian sand subgrade base layer 5, geotextile isolation layer 4, water-stabilized base layer (i.e., aeolian sand composite natural gravel layer) 3, old roadbed reinforcement layer (nanosilyl coating) 2, and cement aeolian sand composite edging layer 1.

[0030] Furthermore, the thickness of the nano-silyl coating 2 can be 3 mm, which penetrates the dust-free pavement structure.

[0031] Furthermore, the thickness of the water-stabilized base layer can be 23cm.

[0032] Furthermore, the aeolian sand roadbed base layer can be 50-80cm thick.

[0033] Furthermore, the composite edging layer of aeolian sand, natural gravel, cement-stabilized soil, and soil can be 10cm thick.

[0034] Furthermore, the compaction degree of the water-stabilized base course is 95% to 100%.

[0035] Furthermore, the cement-aeolian sand composite edging layer is made of aeolian sand composite natural gravel containing 1.5% cement by mass, and the surface's resistance to wind erosion is improved through cement curing.

[0036] Furthermore, the aeolian sand composite natural gravel cement-cemented dust-free pavement layer is also made of aeolian sand composite natural gravel containing 4% cement by mass.

[0037] The preparation method of the dust-free pavement structure suitable for desert areas comprises the following steps:

[0038] (1) cleaning the original old road bed, compacting the aeolian sand road bed base;

[0039] (2) laying geotextile as a geotextile isolation layer on the aeolian sand road bed base, and the edge overlap width of two adjacent geotextiles is greater than or equal to 30 cm;

[0040] (3) layer-by-layer filling aeolian sand, natural sand and gravel and cement mixture on the geotextile isolation layer, and compacting to form an aeolian sand composite natural sand and gravel cement gel dust-free pavement layer;

[0041] (4) spraying a nano silane-based coating on the aeolian sand composite natural sand and gravel cement gel dust-free pavement layer;

[0042] The material of the nano silane-based coating is prepared by the following steps: 90 grams of nano silane-based polymer (triethoxysilane) is added to 1000 milliliters of water, and a high-speed stirrer is used to stir at 1000 revolutions per minute to ensure that the components are fully dispersed and uniform.

[0043] When the thickness of the nano silane-based coating is controlled to be 3 mm into the dust-free pavement structure, the coated plate is placed in an experimental box simulating a natural environment to test the waterproof performance, air permeability and ultraviolet resistance. The test results show that the waterproof performance of the nano silane-based waterproof coating material reaches P12, and after 180 days of ultraviolet irradiation, the waterproof performance attenuation rate is only 0.3%, indicating that the material can meet the actual use requirements.

[0044] (5) laying aeolian sand composite natural sand and gravel cement stabilized soil composite hemming layer on the surfaces of the old road bed on both sides, mechanically compacting and curing for 7 days.

[0045] In the utility model, the surface composite hemming layer is formed into a rigid protective shell through cement solidification, the nano coating enhances the sand particle adhesion, the geotextile isolation layer disperses stress, and the tower base layer absorbs deformation, so that multi-layer synergistic wind and dust erosion and reduction are realized.

Claims

1. A dust-free pavement structure suitable for desert areas, characterized in that, The method includes sequentially setting a wind-blown sand subgrade base layer, a geotextile isolation layer, a wind-blown sand composite natural sand and gravel cement-cemented dust-free pavement layer, a nano-silyl coating layer on the top surface of the old road subgrade, and a wind-blown sand composite natural sand and gravel cement-stabilized soil composite edging layer on both sides of the old road subgrade.

2. The dust-free pavement structure suitable for desert areas according to claim 1, characterized in that, The thickness of the nano-silyl coating is 3 mm, which penetrates the dust-free pavement structure.

3. The dust-free pavement structure suitable for desert areas according to claim 1, characterized in that, The thickness of the aeolian sand composite natural gravel cement cement-cemented dust-free pavement layer is 23cm.

4. The dust-free pavement structure suitable for desert areas according to claim 1, characterized in that, The aeolian sand roadbed base layer is 50~80cm thick.

5. The dust-free pavement structure suitable for desert areas according to claim 1, characterized in that, The composite edging layer of aeolian sand, natural gravel, cement-stabilized soil, and soil is 10cm thick.

6. The dust-free pavement structure suitable for desert areas according to claim 1, characterized in that, The compaction degree of the material used to make the aeolian sand composite natural gravel cement cement-cemented dust-free pavement layer is 95%~100%.

Images