CN211446439U - Long-life pavement structure based on semi-flexible base pavement - Google Patents
Long-life pavement structure based on semi-flexible base pavement Download PDFInfo
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- CN211446439U CN211446439U CN201921952316.5U CN201921952316U CN211446439U CN 211446439 U CN211446439 U CN 211446439U CN 201921952316 U CN201921952316 U CN 201921952316U CN 211446439 U CN211446439 U CN 211446439U
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Abstract
The utility model provides a long-life road surface structure based on semi-flexible basic unit road surface, this semi-flexible basic unit road surface structure include the road bed, semi-flexible basic unit and surface course have been laid in proper order on the road bed, semi-flexible basic unit is including opening grading macroporous bituminous mixture and cement base mucilage. The utility model provides a semi-rigid or flexible basic unit of present road surface structure, there is the problem that easily ftractures, high temperature season easily produce the rut disease.
Description
Technical Field
The utility model relates to a road construction technical field, concretely relates to long-life road surface structure based on semi-flexible basic unit road surface.
Background
At present, in the pavement structure adopted by high-grade road construction in China, two main base layers of the pavement structure are a semi-rigid base layer and a flexible base layer.
The semi-rigid base layer has the characteristics of low cost, good compression resistance and the like, but is easy to crack, and influences the long-term performance of the pavement; the flexible base layer has good crack resistance, but the high-temperature stability is insufficient, and the track disease is easy to generate to a greater extent in high-temperature seasons.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, a long-life pavement structure based on a semi-flexible base pavement is provided so as to solve the problems that the semi-rigid or flexible base pavement structure is easy to crack and track diseases are easy to generate in high-temperature seasons.
In order to realize above-mentioned purpose, provide a long-life road surface structure based on semi-flexible basic unit road surface, include:
the semi-flexible asphalt pavement comprises a roadbed, wherein a semi-flexible base layer and a surface layer are sequentially paved on the roadbed, and the semi-flexible base layer comprises a grading macroporous asphalt mixture and cement-based mortar.
Further, the semi-flexible base layer comprises a open-graded macroporous asphalt mixture with the weight ratio of 70% -80% and cement-based adhesive cement with the weight ratio of 20% -30%.
Further, the open-graded macroporous asphalt mixture comprises coarse aggregates, fine aggregates, fillers and asphalt.
Further, the coarse aggregate comprises a first component with the particle size of 10-15 mm and a second component with the particle size of 5-15 mm, the fine aggregate comprises a third component with the particle size of 0-5 mm, and the weight ratio of the first component to the second component to the third component is 45-50: 40-45: 5 to 15.
Further, the filler is used in an amount of 1.0% to 2.0% of the sum of the weights of the first component, the second component and the third component.
Further, the amount of the asphalt is 3.0 to 5.0 percent of the sum of the weights of the first component, the second component and the third component.
Further, the cement-based cement paste comprises cement, fly ash, slag powder, a water reducing agent, water and polymer emulsion.
Further, the cement-based mortar comprises, by weight, 1-2 parts of cement, 0.15-0.3 part of fly ash, 0.2-0.4 part of slag powder, 0.1-0.2 part of a water reducing agent, 0.3-0.6 part of water and 0.6-1.2 parts of a polymer emulsion.
Further, the porosity of the open-graded macroporous asphalt mixture is 20-30%.
The beneficial effects of the utility model reside in that, the utility model discloses a long-life road surface structure based on semi-flexible basic unit road surface is used for the basic unit of road with semi-flexible material, when improving road surface structure's the performance of being on active service, improving road surface structure's life, still does not change the surface course structure on road surface, does not influence the characteristics of being on active service of original pavement, has better suitability and changes in popularization and application. Further, the semi-flexible base layer is based on the open-graded macroporous asphalt mixture, and cement-based mortar is poured into the semi-flexible base layer to form a compact structure, so that the integrity of the base layer structure of the road is ensured, pavement cracks can be prevented from occurring, the high-temperature stability of the overall structure of the pavement can be improved, and the occurrence of pavement track diseases is prevented.
Drawings
Fig. 1 is the utility model discloses long-life road surface structure's based on semi-flexible basic unit road surface schematic structure.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
Referring to fig. 1, the utility model provides a long-life road surface structure based on semi-flexible basic unit road surface, include: a roadbed 1, a semi-flexible base layer 4 and a surface layer 6.
Specifically, a semi-flexible base layer 4 and a surface layer 6 are sequentially paved on the roadbed 1. The semi-flexible base layer 4 comprises open-graded macroporous asphalt mixture and cement-based cement. The open-graded macroporous asphalt mixture is laid on the roadbed 1, the cement-based mucilage is poured on the open-graded macroporous asphalt mixture, and the cement-based mucilage permeates and is filled in the pores of the open-graded macroporous asphalt mixture to form the semi-flexible base layer 4. The facing layer 6 is laid on the semi-flexible base layer 4.
The utility model discloses a long-life road surface structure based on semi-flexible basic unit road surface is used for the basic unit of road with semi-flexible material, when improving road surface structure's the performance of being in active service, improving road surface structure's life, still does not change the surface course structure on road surface, does not influence the characteristics of being in active service of original pavement, has better suitability and changes in popularization and application. Further, the semi-flexible base layer is based on the open-graded macroporous asphalt mixture, and cement-based mortar is poured into the semi-flexible base layer to form a compact structure, so that the integrity of the base layer structure of the road is ensured, pavement cracks can be prevented from occurring, the high-temperature stability of the overall structure of the pavement can be improved, and the occurrence of pavement track diseases is prevented.
In this embodiment, a roadbed improving layer 2 is laid on the roadbed 1. A lower base layer 3 is laid on the roadbed improving layer 2. The semi-flexible base layer 4 is laid on the lower base layer 3. An anti-cracking layer 5 is laid on the semi-flexible base layer 4. A surface layer 6 is laid on the anti-cracking layer 5. The face layer 6 includes a lower face layer 61, an intermediate face layer 62 and an upper face layer 63. The lower layer 61 is laid on the crack-preventing layer 5, and the middle layer 62 and the upper layer 63 are laid on the lower layer 61 in this order.
Specifically, the roadbed improving layer 2 is made of a gravel material with good water permeability, and the thickness is not less than 15 cm.
The lower base layer 3 is water-stable macadam. Sufficient cement and water are added into the crushed stone with certain gradation, and after the mixture obtained by mixing is compacted and cured, when the strength of the mixture meets the specified requirement, the mixture is called cement-stabilized crushed stone. The thickness of the lower base layer is not less than 30cm, cement with the strength of 42.5 is adopted, and the consumption of the cement is 4% of the weight of the broken stone.
The upper base layer is a semi-flexible base layer 4, and the total thickness is 6 cm-8 cm.
The anti-cracking layer 5 is made of geotextile, hot asphalt permeable layer oil and hot asphalt viscous layer oil. Specifically, geotextile is laid between the semi-flexible base layer 4 and the lower layer 61. After the construction of the semi-flexible base layer 4 is completed, the sharp and abrupt parts of the upper surface of the semi-flexible base layer 4 are shoveled, the seriously damaged, sunken and broken parts of the upper surface of the semi-flexible base layer 4 are shoveled, and the shoveled and broken parts are filled with cement mortar. After the upper surface of the semi-flexible base layer 4 is ensured to be dried, hot asphalt permeable layer oil is sprayed on the upper surface of the semi-flexible base layer 4, and the using amount of the hot asphalt permeable layer oil is about 0.8kg/m2～1.2kg/m2The spraying is uniform. And laying the geotextile on the sprayed hot asphalt permeable layer oil. After the geotextile is laid, hot asphalt bonding layer oil is sprayed on the geotextile. The hot asphalt viscous layer oil is used in an amount of about 0.4kg/m2～0.6kg/m2Note that the distribution is uniform.
The total thickness of the surface layer 6 is 16 cm-18 cm.
The lower surface layer 61 is an AC-20 mixture and adopts 70# matrix petroleum asphalt.
The middle surface layer 62 is a SMA-16 mixture and adopts SBS modified asphalt.
The upper surface layer 63 is a SMA-13 mixture and adopts SBS modified asphalt.
In the embodiment, the semi-flexible base layer 4 comprises 70-80% by weight of open-graded macroporous asphalt mixture and 20-30% by weight of cement-based cement paste.
Specifically, the open-graded macroporous asphalt mixture comprises coarse aggregates, fine aggregates, fillers and asphalt.
The coarse aggregate is basalt or diabase.
The fine aggregate is limestone.
The filler is mineral powder. Further, the mineral powder is limestone mineral powder.
In this embodiment, the coarse aggregate includes a first component having a particle size of 10mm to 15mm and a second component having a particle size of 5mm to 15 mm. The fine aggregate includes a third component having a particle size of 0mm to 5 mm. The weight ratio of the first component to the second component to the third component is 45-50: 40-45: 5 to 15.
The amount of the filler is 1.0-2.0% of the total weight of the first component, the second component and the third component.
The amount of the asphalt is 3.0-5.0% of the sum of the weight of the first component, the second component and the third component.
The porosity of the open-graded macroporous asphalt mixture is 20-30%.
Specifically, the main parameter requirements of the open-graded macroporous asphalt mixture are as follows:
in this example, the cement-based cement paste includes cement, fly ash, slag powder, water reducer, water, and polymer emulsion.
The cement-based mortar comprises, by weight, 1-2 parts of cement, 0.15-0.3 part of fly ash, 0.2-0.4 part of slag powder, 0.1-0.2 part of water reducing agent, 0.3-0.6 part of water and 0.6-1.2 parts of polymer emulsion.
The cement is ordinary portland cement with the reference number of 42.5.
The water reducing agent is a polycarboxylic acid water reducing agent.
The polymer emulsion is styrene-butadiene emulsion.
The utility model discloses a long-life road surface structure based on semi-flexible basic unit road surface has high strength, good high temperature stability and anti rutting performance, good anti fracture performance, low temperature resistant, water-fast harm, long service life, and later stage maintenance is with low costs, easily promotes.
The utility model also provides a construction method of long-life road surface structure based on semi-flexible basic unit road surface, including following step:
and S1, preparing open-graded macroporous asphalt mixture and cement-based cement paste.
S11, preparing a open-graded macroporous asphalt mixture.
S111, providing coarse aggregate, fine aggregate, filler and asphalt in parts by weight.
The coarse aggregate is basalt. The fine aggregate is limestone. Limestone mineral powder is filled.
And S112, mixing and stirring the coarse aggregate, the fine aggregate, the filler and the asphalt provided by the step S111 to prepare the open-graded macroporous asphalt mixture.
S12 preparation of cement-based cements.
S121, providing cement, fly ash, slag powder, a water reducing agent, water and a polymer emulsion in parts by weight.
S122, mixing the cement, the fly ash, the slag powder, the water reducing agent, the water and the polymer emulsion provided in the step S121.
And S2, laying the prepared open-graded macroporous asphalt mixture on the roadbed 1 and compacting.
And S3, pouring the prepared cement-based cement paste on the surface of the compacted open-graded macroporous asphalt mixture, wherein the cement-based cement paste penetrates into and fills the pores of the compacted open-graded macroporous asphalt mixture to form a semi-flexible base layer 4 on the roadbed 1.
And S4, paving the surface layer 6 on the semi-flexible base layer 4.
Example one
A long-life pavement structure based on a semi-flexible base pavement comprises a semi-flexible base. The semi-flexible base layer comprises a grading macroporous asphalt mixture and cement-based cement.
The open-graded macroporous asphalt mixture comprises the following components in parts by weight: 95 parts of coarse aggregate, 5 parts of fine aggregate, 2 parts of filler and 5 parts of asphalt.
The coarse aggregate is basalt. The fine aggregate is limestone. Limestone mineral powder is filled.
Wherein the coarse aggregate comprises 50 parts of the first component and 45 parts of the second component. The fine aggregate includes 5 parts of the third component.
The amount of filler used is 2 parts.
The amount of asphalt is 5 parts.
The cement-based mortar comprises the following components in parts by weight: 10 parts of cement, 1.5 parts of fly ash, 2 parts of slag powder, 1 part of water reducing agent, 6 parts of water and 6 parts of polymer emulsion.
The embodiment has the advantages of high asphalt consumption, better bonding property of the matrix of the macroporous asphalt mixture, higher structural stability, and capability of obtaining a pavement structure with better performance by matching with cement-based mortar.
Example two
A long-life pavement structure based on a semi-flexible base pavement comprises a semi-flexible base. The semi-flexible base layer comprises a grading macroporous asphalt mixture and cement-based cement.
The open-graded macroporous asphalt mixture comprises the following components in parts by weight: 90 parts coarse aggregate, 10 parts fine aggregate, 1.5 parts filler and 4 parts asphalt.
The coarse aggregate is basalt. The fine aggregate is limestone. Limestone mineral powder is filled.
Wherein the coarse aggregate comprises 48 parts of the first component and 42 parts of the second component. The fine aggregate includes 10 parts of the third component.
The amount of filler used was 1.5 parts.
The amount of asphalt is 4 parts.
The cement-based mortar comprises the following components in parts by weight: 15 parts of cement, 2.3 parts of fly ash, 3 parts of slag powder, 1.5 parts of water reducing agent, 4.5 parts of water and 9 parts of polymer emulsion.
The asphalt of the embodiment has the advantages of moderate consumption, good compatibility with structural stability and deformation resistance, economy and easy popularization.
EXAMPLE III
A long-life pavement structure based on a semi-flexible base pavement comprises a semi-flexible base. The semi-flexible base layer comprises a grading macroporous asphalt mixture and cement-based cement.
The open-graded macroporous asphalt mixture comprises the following components in parts by weight: 85 parts of coarse aggregate, 15 parts of fine aggregate, 1 part of filler and 3 parts of asphalt.
The coarse aggregate is basalt. The fine aggregate is limestone. Limestone mineral powder is filled.
Wherein the coarse aggregate comprises 45 parts of the first component and 40 parts of the second component. The fine aggregate includes 15 parts of the third component.
The amount of filler used is 1 part.
The amount of asphalt is 3 parts.
The cement-based mortar comprises the following components in parts by weight: 20 parts of cement, 3 parts of fly ash, 4 parts of slag powder, 2 parts of water reducing agent, 3 parts of water and 12 parts of polymer emulsion.
The asphalt consumption of the embodiment is lower, the porosity of the matrix of the macroporous mixture is larger, the construction quality of the cement-based mortar is easier to guarantee, the deformation resistance of the whole structure is stronger, and the asphalt mortar is more economical and practical and convenient to popularize.
It should be noted that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
The present invention has been described in detail with reference to the embodiments shown in the drawings, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the present invention, which are intended to be limited only by the scope of the appended claims.
Claims (1)
1. The long-life pavement structure based on the semi-flexible base pavement is characterized by comprising a roadbed, wherein the roadbed is sequentially paved with a semi-flexible base layer and a surface layer, and the semi-flexible base layer comprises a grading macroporous asphalt mixture and a cement-based adhesive cement;
an anti-cracking layer is laid on the semi-flexible base layer;
the surface layer is laid on the anti-cracking layer;
the porosity of the open-graded macroporous asphalt mixture is 20-30%.
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| CN201921952316.5U CN211446439U (en) | 2019-11-11 | 2019-11-11 | Long-life pavement structure based on semi-flexible base pavement |
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| CN201921952316.5U CN211446439U (en) | 2019-11-11 | 2019-11-11 | Long-life pavement structure based on semi-flexible base pavement |
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