CN216999135U

CN216999135U - Bituminous paving semi-rigid base course microcrack homogenization regeneration punishment road surface structure

Info

Publication number: CN216999135U
Application number: CN202122969310.2U
Authority: CN
Inventors: 吴超凡; 李会安; 陈燕琴
Original assignee: XI'AN CHANGDA HIGHWAY MAINTENANCE TECHNOLOGY CO LTD
Current assignee: XI'AN CHANGDA HIGHWAY MAINTENANCE TECHNOLOGY CO LTD
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-07-19
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to the technical field of highway engineering, in particular to a microcrack homogenization treatment pavement structure for a semi-rigid base course of an asphalt pavement. The problem that a flexible base layer is prone to net cracking and sinking is solved. The structure of the utility model comprises a long-life asphalt pavement typical structure and a durable asphalt pavement typical structure, wherein the long-life asphalt pavement typical structure comprises a microcrack homogenization treatment base layer, a large-particle size cement regeneration base layer and a surface layer; the microcrack homogenizing regeneration treatment base layer, the large-particle-size cement regeneration base layer and the surface layer are sequentially laid from bottom to top; the typical structure of the durable asphalt pavement comprises a microcrack homogenized regenerative treatment base layer and a surface layer, wherein the microcrack homogenized regenerative treatment base layer and the surface layer are sequentially paved from bottom to top.

Description

Bituminous paving semi-rigid base course microcrack homogenization regeneration punishment road surface structure

Technical Field

The utility model relates to the technical field of highway engineering, in particular to a microcrack homogenization treatment pavement structure for a semi-rigid base course of an asphalt pavement.

Background

Since the eighties of the last century, most expressways, national provincial roads and municipal roads in China adopt semi-rigid base layers, and the semi-rigid base layers are not provided with expansion joints, so when the strain generated by dry shrinkage and warm shrinkage exceeds the deformation resistance of the materials or the multiple expansion and contraction deformation of the dry shrinkage and the warm shrinkage exceeds the fatigue life of the materials, the semi-rigid base layers crack, and as the cracked blocks are large, the expansion and contraction deformation amount of the end parts of the blocks exceeds the tensile strain of asphalt paving materials or the expansion and contraction deformation of the end parts of the blocks exceeds the fatigue life of the asphalt paving layers, the reflection cracks of asphalt pavements are further caused. Rainwater seeps down along the crack and then accumulates in the impervious base layer or the pavement structure layer and the road bed, under the action of vehicle load, slurry pumping and interlayer emptying of the base layer are caused, the road bed is wet and soft, and further, diseases such as pavement network cracks, settlement and the like are caused.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model aims to solve the problems that the existing pavement has the defects of reflection cracks, the heavy load resistance is low, and the flexible base layer is easy to generate net cracks and sink, and provides a microcrack homogenizing regeneration treatment pavement structure for a semi-rigid base layer of an asphalt pavement.

In order to achieve the purpose, the technical scheme of the utility model is as follows: the utility model provides a bituminous paving semi-rigid base course microcrack homogenization regeneration punishment road surface structure which characterized in that: the structure is a typical structure of a long-life asphalt pavement, and comprises a microcrack homogenization treatment base layer, a large-particle-size cement regeneration base layer and a surface layer; the microcrack homogenizing regenerative treatment base layer, the large-particle-size cement regenerative base layer and the surface layer are sequentially paved from bottom to top.

Further, the structure is a typical structure of the durable asphalt pavement, and comprises a microcrack homogenization regeneration treatment base layer and a surface layer, wherein the microcrack homogenization regeneration treatment base layer and the surface layer are sequentially paved from bottom to top.

Further, the surface layer is an asphalt surface layer, and the additional paving form is 5-8 cm asphalt lower surface layer + 3-5 cm asphalt surface layer.

Further, the microcrack homogenization treatment treats that microcracks exist in the regenerated base layer, the bottom surface cracks, the top surface does not obviously crack, and the strength is between that of the semi-rigid base layer and that of the flexible base layer.

Further, the large-particle-size cement regeneration base layer is 18-20 cm thick and is formed by stirring main aggregates and cement cold regeneration asphalt surface layer milling materials serving as caulking materials and filling materials, wherein the particle size of the main aggregates is 53-73 mm or 37.5-63 mm.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model depends on a visual maintenance platform of the pavement to comprehensively treat an old semi-rigid base layer to form a microcrack homogenized treatment base layer, and milling and planing materials of an old asphalt surface layer to form a large-particle-size regenerated base layer, so that the old pavement base layer is converted into a permanent pavement structure layer, and then an asphalt concrete surface layer is paved, so that the pavement has better crack resistance and durability, reflection cracks caused by cracking of the semi-rigid base layer are fundamentally solved, and the reconstruction and pavement of the durable or long-life asphalt pavement are realized.

Description of the drawings:

FIG. 1 is a cross-sectional view of a typical structure of a long-life asphalt pavement of a semi-rigid base course of a semi-rigid asphalt pavement according to the present invention;

FIG. 2 is a cross-sectional view of a typical structure of a durable asphalt pavement of a semi-rigid base course of an asphalt pavement according to the present invention.

Description of the labeling: in the figure: 1-microcrack homogenization regeneration treatment base layer, 2-large particle size cement regeneration base layer and 3-surface layer.

The specific implementation mode is as follows:

in order to make the objects, embodiments and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The first embodiment is as follows:

the present embodiment provides a microcrack homogenized regenerative treatment pavement structure for a semi-rigid base layer of an asphalt pavement, as shown in fig. 1, the pavement structure is a typical structure of a long-life asphalt pavement, and a microcrack homogenized regenerative base layer 1, a large-particle size cement regenerative base layer 2, and an asphalt surface layer 3 are sequentially laid from bottom to top.

The thickness of the large-particle-size cement regeneration base layer 2 is 18-20 cm, and the large-particle-size cement regeneration base layer is formed by mixing main aggregate and cement cold regeneration asphalt surface layer milling materials serving as caulking materials and filling materials by special equipment; the main aggregate comprises two specifications, one is 53-73 mm in nominal particle size and is suitable for highways with large traffic volume and heavy load; a particle having a nominal particle diameter of 37.5 to 63 mm.

The second embodiment:

the present embodiment provides a microcracked homogenized recycled pavement structure of a semi-rigid base layer of an asphalt pavement, as shown in fig. 1, the pavement structure is a typical structure of a durable asphalt pavement, and a microcracked homogenized recycled base layer 1 and an asphalt surface layer 3 are sequentially laid from bottom to top.

The surface layer 3 of the two embodiments is an asphalt surface layer, and the additional paving form is 5-8 cm of asphalt lower surface layer and 3-5 cm of asphalt surface layer.

The microcrack homogenized treated regenerative base layer 1 is characterized in that the depth and the position of the grouting hole are determined according to the 'physical examination' of a road by a visual cloud platform for road surface maintenance and by the aid of special detection to diagnose that the road structure layer has defects, and generally the road structure layer needs to be penetrated from top to bottom; the geopolymer grouting material can be used for reinforcing a pavement structure, treating diseases and reinforcing a road bed, so that the structural strength of the flexible semi-rigid base layer is homogenized; the semi-rigid base layer after milling the asphalt surface layer is obtained by milling the asphalt surface layer after the construction of the old asphalt pavement in the geopolymer grouting reinforcement treatment is completed.

The treatment of the regenerated base layer by the microcrack homogenization treatment comprises the following steps:

(1) firstly, carrying out physical examination on a road by adopting a pavement maintenance visual cloud platform, carrying out road condition grade division according to the obtained PCI, assisting with special detection, diagnosing the position of a road structure layer with defects, and identifying the position of a damaged area; (2) performing geopolymer grouting reinforcement on the damaged area of the old asphalt surface layer, laying grouting damaged holes according to the damaged shape, inserting grouting heads into the holes, and performing grouting construction;

(3) milling the old asphalt surface layer to obtain a 500m working surface, discarding the milling material on the 500m working surface, continuing milling the rest road section, and treating the microcrack on the semi-rigid base layer by using special equipment.

The milling and planing system for the cement cold recycled asphalt surface layer in the large-particle-size cement recycled base layer 2 is formed by adding water and cement into an asphalt surface layer milling and planing material according to a construction ratio and mixing the mixture in special recycling equipment.

The pavement structure of the utility model depends on a visual maintenance platform of the pavement, adopts special mechanical equipment to carry out flexible regeneration on the semi-rigid base layer, so that the semi-rigid base layer generates internal pre-cracking or damage, forms a cement concrete slab with similar lower strength, is in a tight interlocking state, and has the performance of a flexible base layer; by adopting a geopolymer grouting reinforcement technology, the bottom of the base layer is eliminated, the road bed is reinforced, the bearing capacity of the road structure is improved, the strength of the road structure is homogenized, and the microcrack homogenization regeneration treatment base layer is formed.

Claims

1. The utility model provides a bituminous paving semi-rigid base course microcrack homogenization regeneration punishment road surface structure which characterized in that: the structure is a typical structure of a long-life asphalt pavement, and comprises a microcrack homogenization treatment base layer (1), a large-particle-size cement regeneration base layer (2) and a surface layer (3); the microcrack homogenizing regeneration treatment base layer (1), the large-particle-size cement regeneration base layer (2) and the surface layer (3) are laid in sequence from bottom to top.

2. The microcracked homogenized retreated pavement structure for an asphalt pavement semi-rigid base according to claim 1, characterized in that: the thickness of the large-particle-size cement regeneration base layer (2) is 18-20 cm.

3. The utility model provides a bituminous paving semi-rigid base course microcrack homogenization regeneration punishment road surface structure which characterized in that: the structure is a typical structure of a durable asphalt pavement and comprises a microcrack homogenization regeneration treatment base layer (1) and a surface layer (3), wherein the microcrack homogenization regeneration treatment base layer (1) and the surface layer (3) are sequentially paved from bottom to top.

4. The micro-crack homogenized retreated pavement structure for an asphalt pavement semi-rigid base layer according to claim 1 or 3, characterized in that: the surface layer (3) is an asphalt surface layer, and the additional paving form is 5-8 cm asphalt lower surface layer + 3-5 cm asphalt surface layer.

5. The micro-crack homogenized retreated pavement structure for the semi-rigid base layer of the asphalt pavement as claimed in claim 4, characterized in that: the microcrack homogenizing regeneration treatment base layer (1) is internally provided with microcracks, the bottom surface cracks, the top surface does not obviously crack, and the strength is between that of the semi-rigid base layer and that of the flexible base layer.