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Method for evaluating rutting resistance of asphalt pavement structure

A technology of asphalt surface layer and evaluation method, which is applied in the direction of testing the strength of materials by applying repetitive force/pulse force, which can solve the problem of difficulty in ensuring the anti-rutting performance of pavement structures.

Inactive Publication Date: 2012-06-13
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, it is difficult to guarantee the anti-rutting performance of the pavement structure by the current normative anti-rutting performance evaluation method, and it is necessary to evaluate the rutting of asphalt pavement from the perspective of structure

Method used

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  • Method for evaluating rutting resistance of asphalt pavement structure
  • Method for evaluating rutting resistance of asphalt pavement structure
  • Method for evaluating rutting resistance of asphalt pavement structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The initial surface layer structure of an uphill section of an expressway is

[0052]4.5cmSMA-16+5.5cmAC-20+6cmAC-25. The proportion of heavy-duty vehicles on the original road surface is relatively large. After six months of opening to traffic, serious rutting occurred on the uphill section; later, the original road surface was milled and then re-paved. The road surface structure after treatment was 4.5cmFAC-13+5.5cm FAC-20+6cmFAC-25, all three layers use modified asphalt as binder. After maintenance, there are few road rutting diseases.

[0053] If the standard rutting test method is used to carry out rutting tests on the above six asphalt mixtures, the test conditions are standard test conditions: load 0.7Mpa, loading speed 42 times / min, uniform temperature field 60 °C. The test results are shown in Table 1.

[0054] Table 1 Standard rutting test results of asphalt mixture in each layer of surface course

[0055]

[0056] Compared with the relevant standards o...

Embodiment 2

[0063] A highway has a continuous uphill section of nearly 50 kilometers. The original pavement design surface structure is 4cmSMA-13+5cm modified asphalt AC-20+6cmAC-20. Due to the flaws in the code, the original design has not been tested for the anti-rutting performance of the structure, so it cannot be guaranteed that the structure is the most economical in terms of anti-rutting performance. In addition, the elevation difference of this road section is very large (the elevation of the foot of the slope is 920m, and the elevation of the top of the slope is 2350m); The foot temperature difference is about 9°C; continuous climbing will also cause the vehicle to travel slower and slower, especially for heavy-duty vehicles.

[0064] It can be seen that it is difficult to adopt uniform rutting test conditions for this ultra-long continuous uphill road section, and it needs to be processed in sections. It is divided into three sections, and the corresponding elevation ranges are...

Embodiment 3

[0071] The original design of the asphalt pavement structure of an expressway is 4cmSBS modified asphalt AC-13+6cmSBS modified asphalt AC-20+7cm AC-25. Due to the defects of the specification, the original design has not passed the structural anti-rutting performance test, so it cannot Ensure that the structure is the most economical from the point of view of anti-rutting performance. In addition, the traffic volume in the uplink direction and the downlink direction of the road is quite different. Here, the method of the present invention will be used for structural optimization to determine the respective optimal structural combinations for the uplink and downlink directions.

[0072] Representative rutting test conditions: Since the proportion of heavy-duty vehicles in the upward direction is larger than that in the downward direction, the corresponding rutting test loads are 1.1MPa and 0.9MP respectively: the temperature conditions of the road surface in the upward and downw...

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Abstract

The invention discloses a method for evaluating the rutting resistance of an asphalt pavement structure. The method is characterized by comprising the following steps of: firstly, setting a rutting test condition and carrying out full-depth rutting test on a test piece of an asphalt pavement combined structure; calculating according to the formula shown in the specification to obtain an overall dynamic stability DST of the asphalt pavement structure, wherein in the formula, d3 and d4 respectively represent displacement deformation corresponding to the 1890th milling and the 2520th milling; and finally, controlling the rutting resistance of each asphalt pavement combined structure according to a stability control standard [DS]T of the asphalt pavement structure, wherein if the DST is more than the [DS]T, the asphalt pavement structure meets the requirements of the rutting resistance. According to the method for evaluating the rutting resistance of the asphalt pavement structure, the rutting resistance of the asphalt pavement structure can be accurately reflected; and the method can be used as a beneficial guide to an asphalt pavement design.

Description

technical field [0001] The invention relates to a method for evaluating the anti-rutting performance of an asphalt pavement structure. Background technique [0002] my country's code requires that the anti-rutting performance of asphalt mixture be tested in the design of asphalt mixture materials, but this can only reflect the anti-rutting performance of asphalt mixture, and the asphalt pavement structure composed of qualified asphalt mixture, its overall How the anti-rutting performance is unknown. Engineering practice also shows that rutting defects are often found after the qualified asphalt mixture is actually applied to the project. That is to say, it is difficult to guarantee the anti-rutting performance of the pavement structure by the current normative anti-rutting performance evaluation method, and it is necessary to evaluate the rutting of asphalt pavement from the perspective of structure. Contents of the invention [0003] The technical problem to be solved by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
Inventor 关宏信郑健龙罗增杰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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