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Semi-rigid pavement structure and joint type graded broken stone mixture used in semi-rigid pavement structure

A technology of pavement structure and graded gravel, applied in the direction of condensed pavement, roads, roads, etc. paved on site, can solve the problems of large permanent deformation, excessive rutting, surface network cracks, etc., to improve the road bearing capacity strength, extended service life, and improved pavement performance

Inactive Publication Date: 2013-08-21
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Compared with the above several measures to reduce cracks in semi-rigid pavement, the first method cannot fundamentally eliminate the cracking of semi-rigid base material
The second approach is not economically sound
The third method has obvious advantages in reducing reflection cracks and draining water; however, the graded crushed stone structure layer has problems such as low strength, large permanent deformation, surface layer cracks and excessive ruts after opening to traffic, and the graded crushed stone The stone rolling process is easy to loose and difficult to form a whole, which limits the application of graded gravel in my country's highways

Method used

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  • Semi-rigid pavement structure and joint type graded broken stone mixture used in semi-rigid pavement structure
  • Semi-rigid pavement structure and joint type graded broken stone mixture used in semi-rigid pavement structure
  • Semi-rigid pavement structure and joint type graded broken stone mixture used in semi-rigid pavement structure

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Embodiment Construction

[0015] The present invention will be described in further detail below through the accompanying drawings and specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0016] 1. The mixing ratio design of the coupled graded crushed stone mixture, the specific steps are:

[0017] (1) Raw material selection:

[0018] Choose crushed stone raw material: use limestone. Coarse aggregate in limestone has certain toughness, and the bonding type between limestone and asphalt is better, the workability of construction is better, it is easy to roll and form, and it is not suitable for segregation. The technical parameters of coarse aggregate are shown in Table 1, and the technical parameters of fine aggregate are shown in Table 2.

[0019] Table 1 Coarse Aggregate Technical Parameters

[0020]

[0021]

[0022] Table 2 Fine aggregate technical parameter table

[0023]

[0024] Selection o...

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Abstract

The invention belongs to the technical field of road engineering and discloses a semi-rigid pavement structure and a joint type graded broken stone mixture used in the semi-rigid pavement structure. The semi-rigid pavement structure comprises an asphalt surface layer and a semi-rigid base layer, and is characterized in that a graded broken stone layer is laid between the asphalt surface layer and the semi-rigid base layer, aggregate of the graded broken stone layer is joint type limestone graded broken stones, a binding agent is asphalt, and the used graded broken stone layer is the joint type graded broken stone mixture.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to a semi-rigid pavement structure and a connected graded gravel mixture used therein. Background technique [0002] As the most important structural form of high-grade highway pavement, semi-rigid pavement plays an important role in highway construction. The semi-rigid base asphalt pavement structure, material design methods and construction technical specifications are becoming more and more perfect. However, some serious problems gradually appeared in the semi-rigid base asphalt pavement during use. Under the repeated action of traffic loads, the semi-rigid base will produce random and irregular periodic stress-strain responses, which will cause the material to suffer from fatigue damage. When the accumulation of fatigue damage reaches the ultimate bearing capacity of the material, the pavement structure will As the number of traffic loads increases, the cracks will cont...

Claims

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Application Information

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IPC IPC(8): E01C7/32E01C7/35C04B26/26
Inventor 彭波李文瑛吕文全袁鹏丁智勇李昆赵洁程志豪许瑞芹张硕李凯峰
Owner CHANGAN UNIV
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