Structure of asphalt pavement applicable to very heavy traffic

A technology for asphalt pavement and traffic, which is applied in the field of asphalt pavement structure to ensure the bearing capacity, improve the density and durability, and improve the permanent deformation resistance and durability.

Inactive Publication Date: 2012-05-02
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the defects existing in the above-mentioned prior art field, and provides an asphalt pavement structure suitable for heavy traffic, so as to solve the problems of anti-rutting deformation and durability of asphalt pavement suitable for heavy traffic, and prolong the service life

Method used

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  • Structure of asphalt pavement applicable to very heavy traffic

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Embodiment 1

[0017] A coal-transporting main road was originally a cement concrete pavement. Due to heavy loads, the cement concrete panels were seriously broken, and the base course was cracked and scoured severely, so it needed to be rebuilt. Trucks account for about 45% of the road's traffic composition. Axle load conversion is carried out according to the asphalt pavement, and the accumulated equivalent axle times within the design period of the lane are 8.3×10 7 times / lane. The overlay plan that can be adopted is: 4cm SBS modified AC-13+SBS modified emulsified adhesive layer+8cm SBS modified densely graded large particle size asphalt mixture LSAM-25+SBS modified emulsified adhesive layer+6cmLSAM-20+ 36cm anti-cracking cement stabilized (fly ash + crushed stone) base + treated original cement concrete pavement (the old cement concrete slab is crushed and compacted as the subbase). Among them, the SBS content of SBS-modified AC-13 in the wear layer is 4.5%; the SBS content of SBS-modi...

Embodiment 2

[0019] An expressway was originally an asphalt pavement structure. Due to heavy loads, it was cracked and seriously damaged by subsidence, so it needed to be rebuilt. The proportion of large trucks in the traffic composition of the expressway accounts for 50% to 60%. According to the conversion of the existing axle load, the accumulated equivalent axle times within the design period of the lane are 6.5×10 7 times / lane. The overlay structure that can be used is: 4cm SBS modified Superpave12.5+SBS modified emulsified adhesive layer+8cm SBS modified densely graded large particle size asphalt mixture LSAM-25+SBS modified emulsified adhesive layer+6cmLSAM-20 +36cm anti-cracking cement stabilized (fly ash + gravel) base + original asphalt pavement after treatment. Among them, the SBS content of SBS-modified Superpave12.5 in the wearing layer is 4.5%; the SBS content of SBS-modified densely-graded large particle size asphalt mixture LSAM-25 in the middle layer is 4%; the content of ...

Embodiment 3

[0021] For a new expressway, the proportion of large trucks in the predicted traffic composition accounts for more than 43%, and the cumulative equivalent axle times within the design period are 7.2×10 7 times / lane. The structural form that can be used is: 4cm SBS modified Superpave12.5+SBS modified emulsified adhesive layer+10cm SBS modified densely graded large particle size asphalt mixture LSAM-25+SBS modified emulsified adhesive layer+6cmLSAM-20+36cm Anti-cracking cement stabilized (fly ash + gravel) base + 18cm anti-cracking cement (fly ash + gravel) subbase. Among them, the SBS content of SBS-modified Superpave12.5 in the wearing layer is 4.5%; the SBS content of SBS-modified densely-graded large particle size asphalt mixture LSAM-25 in the middle layer is 4%; the content of LSAM-20 in the anti-fatigue layer 4.3%; the same amount of fly ash in anti-cracking cement stabilization (fly ash + crushed stone) replaces 8% of stone chips. The above constitutes the present inve...

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Abstract

The invention discloses a structure of an asphalt pavement applicable to very heavy traffic. A wearing layer of the structure adopts 4cm of SBS (styrene butadiene styrene) modified Superpave 12.5 type or AC-13 type modified asphalt concrete; a middle layer of the structure adopts 8-10cm of SBS modified dense gradation LSAM (large stone asphalt mixture)-25; an anti-fatigue layer of the structure adopts 6cm of rich oil LSAM-20 asphalt concrete; a base layer of the structure adopts 36cm of anti-crack stabilized cement; and a subbase layer of the structure adopts treated original cement concrete pavement and treated original asphalt pavement or 18cm of anti-crack stabilized cement. The asphalt pavement structure resists the breaking such as penetrating, cracking, loosing, deforming and the like, resists high-temperature permanent deformation, resists fatigue loading damage, disperses the load, and slows down the reflection crack, so that the problems of rutting deformation resistance and the durability of the very heavy traffic asphalt pavement can be solved, and the service life of the asphalt pavement can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of highway engineering construction and maintenance, and in particular relates to an asphalt pavement structure suitable for heavy traffic. Background technique [0002] The practice of high-grade highway construction and operation at home and abroad shows that with the increase of traffic volume, the increase of axle load and tire pressure, the application of rigid tires and radial tires, and the channelization of traffic vehicles, the anti-rutting ability of asphalt pavement (high temperature resistance Accumulative deformation) and the durability of the road surface have deteriorated significantly, which cannot withstand the severe test of modern transportation development. Of course, there are also factors of insufficient strength of asphalt mixture, but road construction has not deeply understood the roles and differences played by the upper layer, middle layer, and lower layer of asphalt in structural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/08E01C7/24E01C7/26
Inventor 李文良许艳红樊英华王志强张亚娟苏强李旭华李强杨玉东张志伟常爱国兰建丽王向前
Owner SHANXI PROVINCIAL RES INST OF COMM
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