Asphalt surface layer structure of highway

An asphalt surface layer and highway technology, applied in the field of asphalt pavement structure, can solve the problems of high maintenance cost, large thickness of milling and hood, and high road operating cost, so as to reduce engineering cost, ensure anti-rutting performance and good service performance. and the effect of economic advantages

Inactive Publication Date: 2017-04-19
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the maintenance of asphalt pavement mostly adopts the method of milling and planing the upper layer and then adding a cover. For this traditional surface layer structure combination, due to the thicker thickness of the milling and cover, the maintenance cost is higher, resulting in the overall pavement within the life cycle. higher operating costs

Method used

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  • Asphalt surface layer structure of highway

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A kind of 2.5+7.5 novel expressway surface structure combination provided by the present invention, its structure is as follows figure 1 As shown, the structure includes an ultra-thin wear layer 1, an adhesive layer 2, and a middle surface layer 3 from top to bottom.

[0017] Ultra-thin wear layer 1 is designed to have a thickness of 2.5cm, using SMA-10 mixture, SBS modified asphalt, and the mass ratio of each grade of mineral material is 5-10mm diabase: 3-5mm diabase: 0-3 limestone: limestone ore Flour = 68:3:19:10, oil-stone ratio 6.4%, lignin fiber content 0.3% (external mixing). The synthetic gradation of SMA-10 is as follows:

[0018] Table 1 Synthetic gradation of SMA‐10

[0019]

[0020] Adhesive layer 2 adopts SBS modified emulsified asphalt, and the spreading amount is 0.5kg / m2.

[0021] The design thickness of the middle surface layer 3 is 7.5cm, using AC-20 mixture, SBS modified asphalt, and the mass ratio of each grade of mineral material is 10-20mm li...

Embodiment 2

[0036] An expressway asphalt pavement structure is composed of an ultra-thin wear layer with a thickness of 2cm and an intermediate layer with a thickness of 8cm, and modified emulsified asphalt adhesive layer oil is sprayed between the ultra-thin wear layer and the intermediate layer.

[0037] The maximum nominal particle size of the ultra-thin wearing layer mixture is 9.5mm, and the raw material for the mixture is made of modified asphalt, coarse aggregate, fine aggregate, and filler in a weight ratio of 4:42:16:4. Among them, the modified asphalt is SBS polymer modified asphalt, the coarse aggregate is basalt with a particle size of 5 mm and 3 mm, the fine aggregate is limestone machine-made sand with a particle size of less than 3 mm, and the filler is mineral powder obtained by grinding limestone.

[0038] The maximum nominal particle size of the mixture in the middle layer is 19mm. The raw materials for the mixture are modified asphalt, coarse aggregate, fine aggregate an...

Embodiment 3

[0040] An expressway asphalt pavement structure is composed of an ultra-thin wearing layer with a thickness of 3 cm and an intermediate layer with a thickness of 7 cm, and modified emulsified asphalt adhesive layer oil is sprayed between the ultra-thin wearing layer and the intermediate layer.

[0041] The maximum nominal particle size of the ultra-thin wear layer mixture is 9.5mm, and the raw material for the mixture is made of modified asphalt, coarse aggregate, fine aggregate, and filler in a weight ratio of 7:80:54:13. Among them, the modified asphalt is SBS polymer modified asphalt, the coarse aggregate is basalt with a particle size of 10mm and 5mm, the fine aggregate is limestone machine-made sand with a particle size of less than 3mm, and the filler is strong basic rock hydrophobic stone after grinding Fine mineral powder obtained.

[0042] The maximum nominal particle size of the mixture in the middle layer is 19mm. The raw materials for the mixture are modified aspha...

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Abstract

The present invention relates to an asphalt surface layer structure of a highway. The structure is composed of an ultra-thin wearing layer having the thickness of 2-3cm and an intermediate layer having the thickness of 7-8cm. The ultra-thin wearing layer and the intermediate layer are well bonded. Compared with the traditional surface layer structure, the novel surface layer combination can maintain the good performance, as the thickness is smaller, the cost is lower, maintenance and repairing are convenient, and the long life cycle benefit is good.

Description

technical field [0001] The invention relates to an asphalt pavement structure, in particular to a highway asphalt pavement structure, which is suitable for newly-built and reconstructed asphalt pavement. Background technique [0002] The phenomenon of rutting on asphalt pavement in our country is very common. In the road section with many heavy-duty vehicles, the unstable rutting caused by excessive shear stress in the structure is the main form of permanent deformation. The rutting mainly occurs in the upper and middle layers of the surface structure. Floor. Therefore, the shear performance of asphalt mixture in the middle and upper layers is very important for the performance of asphalt pavement. [0003] For a long time, the asphalt pavement of my country's expressway is usually divided into three layers, and the middle and upper layers are mostly composed of 4cm upper layer + 6cm middle surface layer structure. After years of engineering applications, this surface layer...

Claims

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Application Information

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IPC IPC(8): E01C7/18C04B26/26
CPCE01C7/18C04B26/26
Inventor 孙立军叶轩宇吴后选刘黎萍邢成炜王剑吴迎宾陈荣芬金学勤
Owner TONGJI UNIV
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