Long-service-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, inconsistent structural values, structural damage, etc., to reduce consumption and overcome service life Effects of ambiguous design and in-service assessment

Active Publication Date: 2021-02-19
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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  • Long-service-life flexible base asphalt pavement structure
  • Long-service-life flexible base asphalt pavement structure
  • Long-service-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-service-life flexible base asphalt pavement structure, and belongs to the technical field of pavement structures. The pavement structure sequentially comprises, from topto bottom: an asphalt concrete upper surface layer with a thickness of 3-6 cm; a high-modulus anti-rutting asphalt concrete middle surface layer with a thickness of 6-12 cm; a high-modulus asphalt concrete lower surface layer with a thickness of 8-16 cm; an anti-fatigue asphalt concrete layer with a thickness of 4-6 cm; a graded broken stone base layer with a thickness of 10-16 cm; a reinforced graded broken stone subbase layer with a thickness of 12-18 cm; a roadbed improvement soil layer. According to the long-service-life flexible base asphalt pavement structure, the defect of inherent reflection cracks existing all the time is overcome, the consumption of non-renewable resource gravel aggregate is reduced from the perspectives of environment and resources, and the problem that the service life design and the service state evaluation of an asphalt pavement are not clear is solved.

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 Applications(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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