Thin-layer asphalt pavement overlaid with old cement concrete suitable for heavy-duty coal transportation traffic

A technology of old cement and concrete, which is applied to cohesive pavement, roads, roads and other directions paved on site, can solve the problems of short operation observation time, few projects for adding asphalt surface, and no design method, etc. Achieve excellent bearing capacity and high temperature stability, good crack resistance and waterproof performance, excellent anti-reflection crack effect

Inactive Publication Date: 2011-12-28
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's current "Code for Design of Highway Cement Concrete Pavement" (JTG D40-2002) has made guiding requirements for the thickness of the asphalt layer on the old cement concrete pavement. Or the operation observation time after overlaying is short, and there is no mature system design method
Especially for the overlay structure of the old cement concrete pavement that mainly drives heavy traffic of large coal vehicles, the problem is even more serious. At present, there is still no technical and economically feasible thin layer of old cement concrete overlay suitable for heavy traffic of coal transportation asphalt road

Method used

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  • Thin-layer asphalt pavement overlaid with old cement concrete suitable for heavy-duty coal transportation traffic
  • Thin-layer asphalt pavement overlaid with old cement concrete suitable for heavy-duty coal transportation traffic

Examples

Experimental program
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Effect test

Embodiment 1

[0014] The original pavement of a main coal transportation line was made of cement concrete. Due to the heavy load, the cement pavement was severely damaged and needed to be rebuilt with "white plus black". The proportion of large trucks in the traffic composition of the main coal transportation line accounts for 40% to 50%, and through the survey of axle loads, it is found that the designed axle loads of single axle, double axle and three axles and double wheels are all 1.8 to 2.0 times the legal axle load. load limit. The 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 3.5×107 times / lane. The pavement is paved in the following form: the cement concrete slab is provided with a rubber mastic high elastic stress absorption belt, and the rubber mastic high elastic stress absorption belt is provided with a SBS modified rubber with a content of 5% and a thickness of 6mm. Poro...

Embodiment 2

[0016] The original pavement of a main coal transportation line was made of cement concrete. Due to the heavy load, the cement pavement was severely damaged and needed to be rebuilt with "white plus black". The proportion of large trucks in the traffic composition of the main coal transportation line accounts for 50% to 60%, and through the survey of axle loads, it is found that the designed axle loads of single axle, double axle and three axles and double wheels are all 2.0 to 2.2 times the legal axle load. load limit. The 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 9×107 times / lane. The following forms are used to overlay the pavement: the cement concrete slab is provided with a rubber mastic high elastic stress absorption belt, and the rubber mastic high elastic stress absorption belt is provided with a SBS modified rubber with a content of 5% and a thickness of 7mm...

Embodiment 3

[0018] The original pavement of a main coal transportation line was made of cement concrete. Due to the heavy load, the cement pavement was severely damaged and needed to be rebuilt with "white plus black". The proportion of large trucks in the traffic composition of the main coal transportation line accounts for 60% to 70%, and through the investigation of axle loads, it is found that the designed axle loads of single axle, double axle and three axles and double wheels are all 2.2 to 2.5 times the legal axle load. load limit. The 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 2×108 times / lane. The pavement is paved in the following form: the cement concrete slab is provided with a rubber mastic high elastic stress absorption belt, and the rubber mastic high elastic stress absorption belt is provided with a SBS modified rubber with a content of 5% and a thickness of 8mm. ...

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Abstract

The invention relates to a thin-layer asphalt pavement overlaid with old cement concrete suitable for heavy-duty coal transportation. The cement concrete slab is provided with a rubber mastic high elastic stress absorption belt and a rubber mastic high elastic stress absorption belt. SBS modified macroporous LSAM-25 with a thickness of 6-8 mm is arranged on the top, and a SBS modified slurry seal layer with a thickness of 1 cm is arranged on the top of the SBS modified macroporous LSAM-25, and the top of the SBS modified slurry seal layer SBS modified AC-13 with a thickness of 4cm is set, and SBS is passed between SBS modified AC-13 and SBS modified slurry seal layer, SBS modified macroporous LSAM-25 and rubber mastic high elastic stress absorption belt The porosity of the modified emulsified adhesive layer connected with SBS modified macroporous LSAM-25 ranges from 18% to 22%. The pavement has excellent bearing capacity and high temperature stability, good anti-reflective cracking effect, long service life of the pavement, and can meet the needs of heavy-duty traffic such as coal transportation.

Description

technical field [0001] The invention belongs to the field of highway engineering construction and maintenance, and in particular relates to a thin-layer asphalt pavement suitable for overlaying old cement concrete for heavy-duty coal transportation traffic. Background technique [0002] With the sustained and healthy development of the economy, the transportation industry has developed rapidly, and road transportation has shown a trend of multi-axis vehicles and high-efficiency intensification. Due to the weak original standard structure and inaccurate traffic volume prediction, the cement concrete pavement built in the early days in China A large number of early damage or fatigue damage occurred, and the pavement performance decay accelerated. Although the maintenance unit took maintenance measures such as plate replacement and slab bottom grouting, due to the rapid increase in traffic volume and axle load, the pavement was accelerated and damaged. The service life is short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/35
Inventor 赵队家韩萍虞文景申俊敏张启星武移风张晓燕李文良李志强王慧
Owner SHANXI PROVINCIAL RES INST OF COMM
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