Identification method of fatigue failure of asphalt under dynamic shear load

A technology of fatigue failure and identification method, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, and can solve problems such as characterizing and distinguishing the fatigue resistance of asphalt

Active Publication Date: 2017-08-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The linear amplitude sweep test with controlled strain (i.e. linear strain sweep test) is currently the commonly used test method for asphalt accelerated fatigue specification in the world. [1] , since this method was proposed in 2010, the problem of judging the critical point of asphalt fatigue failure during the test has been in the research state, and there are no good indicators and parameters to characterize and distinguish the pros and cons of different asphalt fatigue resistance

Method used

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  • Identification method of fatigue failure of asphalt under dynamic shear load
  • Identification method of fatigue failure of asphalt under dynamic shear load
  • Identification method of fatigue failure of asphalt under dynamic shear load

Examples

Experimental program
Comparison scheme
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specific Embodiment approach 1

[0027] Specific implementation mode 1: In this implementation mode, the accelerated fatigue test of controlled strain is carried out by using matrix asphalt and SBS modified asphalt (referred to as SBS asphalt), the test temperature is 19°C, the test frequency is 10Hz, and the linear strain scanning range is 0.1% to 30%. , The scanning time is designed to be completed in 5 minutes. After the test, the fatigue life of the two kinds of asphalt under this working condition was identified according to the above data analysis process. The identification results are shown in the attached Figure 4 shown.

specific Embodiment approach 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the scanning time of the linear strain scan is designed to be 10 minutes, and the others are the same as Embodiment 1. The identification results are attached Figure 5 shown.

specific Embodiment approach 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the scanning time of the linear strain scan is designed to be 15 minutes, and the others are the same as Embodiment 1. The identification results are attached Image 6 shown.

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Abstract

The invention discloses a method for identifying fatigue failure of asphalt under the action of a dynamic shear load, which relates to a test method for testing the fatigue performance of road asphalt with a dynamic shear rheometer. It solves the problem of judging the critical point of fatigue failure in the current asphalt accelerated fatigue test, and improves the scientific validity of the test data analysis process. The present invention analyzes the accelerated fatigue test data of asphalt under virtual strain coordinates, quantitatively analyzes the occurrence and accumulation of fatigue damage by calculating the virtual strain energy stored in the material during the test, and finally proposes to use the peak point of stored virtual strain energy as the asphalt The critical point criterion for the occurrence of fatigue failure.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a recognition method for judging fatigue failure of road asphalt under the action of dynamic shear load. Background technique [0002] Fatigue cracks will occur on the asphalt pavement due to the repeated action of the wheel load, and the fatigue cracks on the pavement seriously affect the comfort and safety of road driving. The pros and cons of asphalt fatigue resistance have an important contribution to the ability of asphalt pavement to resist fatigue cracks, so it is necessary to evaluate and distinguish the fatigue resistance of different asphalt materials scientifically and effectively. The linear amplitude sweep test with controlled strain (i.e. linear strain sweep test) is currently the commonly used test method for asphalt accelerated fatigue specification in the world. [1] , since the method was proposed in 2010, the critical point identification of asphalt fatigue fail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
Inventor 王超张金喜
Owner BEIJING UNIV OF TECH
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