CN203668790U - Improved graded broken stone base pavement structure - Google Patents

Improved graded broken stone base pavement structure Download PDF

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Publication number
CN203668790U
CN203668790U CN201320767946.1U CN201320767946U CN203668790U CN 203668790 U CN203668790 U CN 203668790U CN 201320767946 U CN201320767946 U CN 201320767946U CN 203668790 U CN203668790 U CN 203668790U
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broken stone
graded broken
stone base
antiseepage
tack coat
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CN201320767946.1U
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Inventor
周志刚
冯永平
袁秀湘
苏应全
张军
蒋腾腾
孙绪康
蒋少稀
罗竞
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Changsha University of Science and Technology
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Changsha University of Science and Technology
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Abstract

The utility model discloses an improved graded broken stone base pavement structure which comprises an asphalt concrete surface layer, a seepage-proofing bonding layer and a soil matrix, wherein the seepage-proofing bonding layer is paved on the soil matrix; the asphalt concrete surface layer is paved on the seepage-proofing bonding layer; a low-dose cement modified graded broken stone base is paved between the asphalt concrete surface layer and the seepage-proofing bonding layer. The improved graded broken stone base pavement structure has the advantages that the structure is simple, the construction is convenient, and the phenomenon of early stage damage can be avoided.

Description

A kind of modification graded broken stone base road structure
Technical field
The utility model relates to road structure, relates in particular to a kind of modification graded broken stone base road structure.
Background technology
Highway in China traffic develop rapidly, in order to adapt to the growing needs of Heavy Traffic, the Pavement on Semi-rigid Type Base structure that the stabilized with inorganic binder rubbles such as road bound pair cement, lime form has been carried out a large amount of research.Semi-rigid type base has good plate body, larger rigidity, higher diffusion weight bearing power and supporting capacity, and the maximum flexural tensile stress value of asphalt surface course on it is reduced, thereby has improved the ability of asphalt surface course opposing driving fatigue failure.Therefore, semi-rigid type base is widely used in the sub-surface of high-grade highway, in domestic built speedway, more than 90% is Pavement on Semi-rigid Type Base.But semi-rigid type base self intrinsic be easy to shrinkage cracking, the poor defect of self-healing ability, cause pavement cracking serious; Road structure drainage condition is poor, after rainwater is built up, easily produces purt mud, thereby cause asphalt surface course check crack to destroy under high speed traveling.
The flexible material of graded broken stone and so on loose type is set between asphalt surface course and semi-rigid type base, is a kind of method that effectively delays asphalt pavement reflection cracking.Adopt high-quality graded broken stone as Semi-Rigid Pavement Structure transition zone, can work to subdue stress, effectively prevent the appearance of semi-rigid pavement reflection crack disease, thereby delay or eliminate other disease of flexible pavement.
Graded broken stone base, above semi-rigid type base, is good thermal insulation topping for semi-rigid type base.It protects uncracked semi-rigid type base to avoid producing temperature shrinkage crack, and the impact of the existing crack that also can cut off semi-rigid type base on asphalt surface course, even eliminates reflection crack.Meanwhile, due to the interlock action between aggregate, make graded broken stone become the deck that can bear certain traffic loading.
But because graded broken stone is a kind of discrete material, generally there is plastic strain large, rigidity is little, stress dispersion capacity is poor, the shortcomings such as flushing resistance is poor, simultaneously in Practical Project (especially for secondary and to get down the highway), the material source of graded broken stone is poor, broken processing, stack, mix and stir, transport, pave, a series of production and construction link quality such as levelling are difficult to strict control, easily cause material structure grating unreasonable, mixture uniformity after moulding is poor, its effect can not always be guaranteed, under heavy traffic effect, can produce excessive post-construction deformation, cause Asphalt Pavement Surface Evenness to be affected, when serious, can make asphalt surface course produce shears and fatigue failure.Meanwhile, erosion resistibility is low, has more aggravated the destruction of flexible pavement.In order to address these problems, continue to keep graded broken stone to stop or delay the effect of Reflective Crack over Asphalt Pavement with Semi-rigid simultaneously, be necessary to research and propose a kind of novel road structure.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, a kind of simple in structure, easy construction is provided, can avoids occurring a kind of modification graded broken stone base road structure of early damage phenomenon.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of modification graded broken stone base road structure, comprise asphalt concrete pavement, antiseepage tack coat and soil matrix, described antiseepage tack coat is layed in soil matrix top, described asphalt concrete pavement is layed in antiseepage tack coat top, is equipped with low dosage modified cement graded broken stone base between described asphalt concrete pavement and antiseepage tack coat.
In described low dosage modified cement graded broken stone base, be equipped with geotechnological member.
Described geotechnological member is geo-grid or geotechnological graticule mesh or geotechnical grid.
Between described antiseepage tack coat and soil matrix, be provided with semi-rigid material basic unit.
Described antiseepage tack coat is anti-seepage geotextile layer or waterproof viscous oil layer.
Compared with prior art, the utility model has the advantage of:
The utility model is laid low dosage modified cement graded broken stone base between asphalt concrete pavement and antiseepage tack coat, the intensity of cement by low dosage to graded broken stone, water stability and durability etc. are improved, test and theoretical research and engineering practice prove, meeting under the prerequisite of structural strength requirement, this modification graded broken stone material can reduce the shrinkage cracking of semi-rigid material effectively, improve graded broken stone water stability energy, the drainage performance of performance graded broken stone, improving existing graded broken stone volume stability, mechanical property, there is many advantages in long-term behaviour and application property aspect.The utility model can further be equipped with geotechnological member in low dosage modified cement graded broken stone base, strengthens the globality of graded broken stone material structure, improves its rigidity, supporting capacity and non-deformability.Antiseepage tack coat can prevent to ooze and invade low dosage modified cement graded broken stone base bottom under the internal water of road surface, strengthens road structure anti-water damage ability.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model the first embodiment.
Fig. 2 is the structural representation of the utility model the second embodiment.
In figure, each label represents:
1, asphalt concrete pavement; 2, low dosage modified cement graded broken stone base; 3, geotechnological member; 4, antiseepage tack coat; 5, semi-rigid material basic unit; 6, soil matrix.
Detailed description of the invention
Fig. 1 shows the first modification graded broken stone base road structure embodiment of the present utility model, this basic unit road surface comprises asphalt concrete pavement 1, antiseepage tack coat 4 and soil matrix 6, antiseepage tack coat 4 is layed in soil matrix 6 tops, asphalt concrete pavement 1 is layed in antiseepage tack coat 4 tops, between asphalt concrete pavement 1 and antiseepage tack coat 4, be equipped with low dosage modified cement graded broken stone base 2, the intensity of cement by low dosage to graded broken stone, water stability and durability etc. are improved, test and theoretical research and engineering practice prove, meeting under the prerequisite of structural strength requirement, this modification graded broken stone material can reduce the shrinkage cracking of semi-rigid material effectively, improve graded broken stone water stability energy, the drainage performance of performance graded broken stone, improving existing graded broken stone volume stability, mechanical property, there is many advantages in long-term behaviour and application property aspect.
The present embodiment is equipped with geotechnological member 3 in low dosage modified cement graded broken stone base 2, can strengthen the globality of graded broken stone material structure, improves its rigidity, supporting capacity and non-deformability.Geotechnique's member 3 is geo-grid or geotechnological graticule mesh or geotechnical grid, antiseepage tack coat 4 is anti-seepage geotextile layer or waterproof viscous oil layer, antiseepage tack coat 4 can prevent to ooze and invade low dosage modified cement graded broken stone base 2 bottoms under the internal water of road surface, strengthens road structure anti-water damage ability.The present embodiment selects geo-grid as geotechnological member 3, selects anti-seepage geotextile layer as antiseepage tack coat 4.
In the present embodiment, in low dosage modified cement graded broken stone base 2, add 1%~2.5% mass percent cement as bonding material, these are different from the research starting point of conventional cement stabilized macadam, the cement dose size adding has obvious difference, the utility model adds the modification graded broken stone obtaining after 1%~2.5% mass percent cement still to belong to the material of loose class instead of the plate body material of class cement stabilized macadam in graded broken stone; In the utility model, low dosage modified cement graded broken stone base 2 had both improved stability, can meet again the requirement of macadam base material pavement performance, when it continues the prevention of maintenance graded broken stone or delays the effect of Reflective Crack over Asphalt Pavement with Semi-rigid, drainage, overcome the defect of graded broken stone as discrete material, avoided using the flexible pavement of graded broken stone base to occur early damage phenomenon.
In low dosage modified cement graded broken stone base 2, graded broken stone compositing range meets: 0.075mm sieve aperture corresponding mass percent of pass 0~7%, 0.6mm sieve aperture corresponding mass percent of pass 6%~25%, 2.36mm sieve aperture corresponding mass percent of pass 16%~40%, 4.75mm sieve aperture corresponding mass percent of pass 22%~55%, 9.50mm sieve aperture corresponding mass percent of pass 31%~80%, 19.0mm sieve aperture corresponding mass percent of pass 60%~95%, 26.5mm sieve aperture corresponding mass percent of pass 79%~100%, 31.5mm sieve aperture corresponding mass percent of pass 100%; Liquid limit <28%, moulds and refers to <9%, crush values <26%.Due to using 1%~2.5% mass percent cement as bonding material, can improve physico mechanical characteristic, pavement performance and the durability of the graded broken stone of poor quality, thereby can relax the requirement of graded broken stone compositing range, adapt to the reality of graded broken stone difficult quality guarantee in Practical Project, strengthen grating crushing technique economic advantages, to apply.
In the present embodiment, 0.075mm sieve aperture corresponding mass percent of pass 0%, 0.6mm sieve aperture corresponding mass percent of pass 8%, 2.36mm sieve aperture corresponding mass percent of pass 18.8%, 4.75mm sieve aperture corresponding mass percent of pass 29%, 9.50mm sieve aperture corresponding mass percent of pass 44.4%, 19.0mm sieve aperture corresponding mass percent of pass 68%, 26.5mm sieve aperture corresponding mass percent of pass 87.6%, 31.5mm sieve aperture corresponding mass percent of pass 100%; Liquid limit 18.2%, plastic limit 16.3%, moulds and refers to be 1.9%, crush values 24.3%.
Fig. 2 shows the second modification graded broken stone base road structure embodiment of the present utility model, and the present embodiment and a upper embodiment are basic identical, and difference is only: between antiseepage tack coat 4 and soil matrix 6, be provided with semi-rigid material basic unit 5.
Although the utility model discloses as above with preferred embodiment, but not in order to limit the utility model.Any those of ordinary skill in the art, in the situation that not departing from technical solutions of the utility model scope, all can utilize the technology contents of above-mentioned announcement to make many possible variations and modification to technical solutions of the utility model, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solutions of the utility model,, all should drop in the scope of technical solutions of the utility model protection any simple modification made for any of the above embodiments, equivalent variations and modification according to the utility model technical spirit.

Claims (6)

1. a modification graded broken stone base road structure, comprise asphalt concrete pavement (1), antiseepage tack coat (4) and soil matrix (6), described antiseepage tack coat (4) is layed in soil matrix (6) top, described asphalt concrete pavement (1) is layed in antiseepage tack coat (4) top, it is characterized in that: between described asphalt concrete pavement (1) and antiseepage tack coat (4), be equipped with low dosage modified cement graded broken stone base (2).
2. a kind of modification graded broken stone base road structure according to claim 1, is characterized in that: in described low dosage modified cement graded broken stone base (2), be equipped with geotechnological member (3).
3. a kind of modification graded broken stone base road structure according to claim 2, is characterized in that: described geotechnological member (3) is geo-grid or geotechnological graticule mesh or geotechnical grid.
4. according to a kind of modification graded broken stone base road structure described in any one in claims 1 to 3, it is characterized in that: between described antiseepage tack coat (4) and soil matrix (6), be provided with semi-rigid material basic unit (5).
5. according to a kind of modification graded broken stone base road structure described in any one in claims 1 to 3, it is characterized in that: described antiseepage tack coat (4) is anti-seepage geotextile layer or waterproof viscous oil layer.
6. a kind of modification graded broken stone base road structure according to claim 4, is characterized in that: described antiseepage tack coat (4) is anti-seepage geotextile layer or waterproof viscous oil layer.
CN201320767946.1U 2013-11-29 2013-11-29 Improved graded broken stone base pavement structure Active CN203668790U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103628380A (en) * 2013-11-29 2014-03-12 长沙理工大学 Low-dose cement modified graded broken stone base pavement
CN113668362A (en) * 2021-07-21 2021-11-19 桂林理工大学 Semi-rigid base layer for preventing bumping at bridge head and construction process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103628380A (en) * 2013-11-29 2014-03-12 长沙理工大学 Low-dose cement modified graded broken stone base pavement
CN113668362A (en) * 2021-07-21 2021-11-19 桂林理工大学 Semi-rigid base layer for preventing bumping at bridge head and construction process

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