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A long-life flexible base asphalt pavement structure

A technology of flexible base and asphalt pavement, which is applied to cohesive pavement paved on site, roads, roads, etc., can solve the problems of water damage to the asphalt layer, poor economic benefits, and inconsistent structural values, etc., to improve service life, Improved rutting resistance, effect of increased stress levels

Active Publication Date: 2022-04-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Semi-rigid base asphalt pavement is the main structural form of expressways in my country at present. Although it is widely used, it has insurmountable disadvantages: 1. Due to the drying and temperature shrinkage of the base stabilized by inorganic binders, it will A large number of cracks are generated, so that the modulus of the structure does not match the value at the time of design; 2. The cracks in the base layer will be reflected upwards to the asphalt surface layer, causing a large number of transverse cracks; 3. The asphalt layer and the inorganic binder stabilize the base layer. Differences in porosity are prone to water damage at the bottom of the asphalt layer, etc.
Although some diseases can make the structure continue to serve through timely maintenance methods, when the structure reaches the end of its service life, it will face structural damage in the full depth range, and the economic benefits in the whole life cycle are poor

Method used

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  • A long-life flexible base asphalt pavement structure
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  • A long-life flexible base asphalt pavement structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The long-life flexible base asphalt pavement structure of this embodiment, such as figure 1 As shown, the composition is as follows:

[0060] Asphalt concrete upper layer 1, its material is SMA-13;

[0061] High modulus anti-rutting asphalt concrete middle surface layer 2, the material is SUP-20;

[0062] The lower layer 3 of high modulus asphalt concrete is made of SUP-25;

[0063] Anti-fatigue asphalt concrete layer 4, the material of which is AC-10;

[0064] Graded crushed stone base 5;

[0065] Reinforced graded crushed stone subbase 6;

[0066] The roadbed improved soil layer 7 is composed of a 6% cement improved soil roadbed, a 4% cement improved soil upper embankment and a 4% cement improved soil lower embankment.

[0067] The thickness, modulus, Poisson's ratio and other parameters of each layer are shown in the table below:

[0068] Material Thickness / m Modulus / MPa Poisson's ratio SMA-13 0.04 11000 0.25 SUP-20 0.08 12000 0....

Embodiment 2

[0073] The long-life flexible base asphalt pavement structure of this embodiment, such as figure 1 As shown, the composition is as follows:

[0074] Asphalt concrete upper layer 1, its material is SMA-13;

[0075] High modulus anti-rutting asphalt concrete middle surface layer 2, the material is SUP-20;

[0076] The lower layer 3 of high modulus asphalt concrete is made of SUP-25;

[0077] Anti-fatigue asphalt concrete layer 4, the material of which is AC-10;

[0078] Graded crushed stone base 5;

[0079] Reinforced graded crushed stone subbase 6;

[0080] The roadbed improved soil layer 7 is composed of a 6% cement improved soil roadbed, a 4% cement improved soil upper embankment and a 4% cement improved soil lower embankment.

[0081] The thickness, modulus, Poisson's ratio and other parameters of each layer are shown in the table below:

[0082] Material Thickness / m Modulus / MPa Poisson's ratio SMA-13 0.03 11000 0.25 SUP-20 0.06 12000 0....

Embodiment 3

[0087] The long-life flexible base asphalt pavement structure of this embodiment is composed as follows:

[0088] Asphalt concrete upper layer 1, its material is SMA-13;

[0089] High modulus anti-rutting asphalt concrete middle surface layer 2, the material is SUP-20;

[0090] The lower layer 3 of high modulus asphalt concrete is made of SUP-25;

[0091] Anti-fatigue asphalt concrete layer 4, the material of which is AC-10;

[0092] Graded crushed stone base 5;

[0093] Reinforced graded crushed stone subbase 6;

[0094] The roadbed improved soil layer 7 is composed of a 6% cement improved soil roadbed, a 4% cement improved soil upper embankment and a 4% cement improved soil lower embankment.

[0095] The thickness, modulus, Poisson's ratio and other parameters of each layer are shown in the table below:

[0096] Material Thickness / m Modulus / MPa Poisson's ratio SMA-13 0.06 11000 0.25 SUP-20 0.12 12000 0.25 SUP-25 0.16 12000 0.25 ...

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Abstract

The invention discloses a long-life flexible base asphalt pavement structure, which belongs to the technical field of pavement structures. The pavement structure includes from top to bottom: asphalt concrete upper layer, its thickness is 3~6cm; high modulus anti-rutting asphalt concrete middle layer, its thickness is 6~12cm; high modulus asphalt concrete lower layer, its thickness 8~16cm; anti-fatigue asphalt concrete layer, its thickness is 4~6cm; graded crushed stone base, its thickness is 10~16cm; reinforced graded crushed stone subbase, its thickness is 12~18cm; roadbed improvement soil layer . The long-life flexible base asphalt pavement structure of the present invention solves the disadvantages of inherent reflection cracks that have always existed, reduces the consumption of non-renewable resource gravel aggregates from the perspective of environment and resources, and overcomes the service life design and service state of asphalt pavement The assessment does not clarify the problem.

Description

technical field [0001] The invention belongs to the technical field of pavement structures, and more specifically relates to a long-life flexible base asphalt pavement structure. Background technique [0002] Asphalt pavement refers to various types of pavement paved with asphalt materials mixed with mineral materials. Asphalt binder improves the ability of paving aggregates to resist road damage from driving and natural factors, making the pavement smooth and less dusty. Permeable and durable, asphalt pavement is the most widely used high-grade pavement in road construction. [0003] Semi-rigid base asphalt pavement is the main structural form of expressways in my country at present. Although it is widely used, it has insurmountable disadvantages: 1. Due to the drying and temperature shrinkage of the base stabilized by inorganic binders, it will A large number of cracks are generated, so that the modulus of the structure does not match the value at the time of design; 2. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/32E01C7/26E01C3/04C04B28/00
CPCE01C7/32E01C7/262E01C3/04C04B28/00C04B2111/0075C04B18/12C04B14/42C04B2103/302C04B16/0683C04B14/48C04B2103/0068
Inventor 马涛张靖霖刘世同刘朝晖邵学富龚仁峥陆宇张孝胜
Owner SOUTHEAST UNIV
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