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Method for testing nonlinear rheological property of asphalt by Large amplitude oscillatory shear stress

A technology of rheological properties and test methods, applied in the direction of flow properties, measuring devices, instruments, etc.

Inactive Publication Date: 2019-08-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical applications, asphalt is unavoidably subjected to large oscillating shear loads and exhibits nonlinear rheological properties. However, at present, researchers mainly focus on the study of linear rheological properties, and there is little research on nonlinear rheological properties. A complete set of research system for nonlinear rheological properties of asphalt

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  • Method for testing nonlinear rheological property of asphalt by Large amplitude oscillatory shear stress
  • Method for testing nonlinear rheological property of asphalt by Large amplitude oscillatory shear stress
  • Method for testing nonlinear rheological property of asphalt by Large amplitude oscillatory shear stress

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Embodiment 1

[0022] Embodiment one: if Figure 1-5 As shown, the method for testing the nonlinear rheological properties of asphalt under large stress oscillation shear load involved in this embodiment, the specific steps are as follows:

[0023] Step 1: Use the dynamic shear rheometer in the stress control mode to carry out the stress scanning test on the asphalt to obtain the dynamic shear modulus, draw the modulus-stress relationship curve with the stress as the abscissa and the dynamic shear modulus as the ordinate, Determine the stress range of the nonlinear rheological region;

[0024] Step 2: On the modulus-stress relationship curve of step 1, select the stress within the range of 5-10 nonlinear rheological regions as the stress level in the time sweep test under the stress large oscillation shear load;

[0025] Step 3: Use the stress level selected in Step 2 to conduct a time-sweeping test on the asphalt under a large oscillating shear load. With time as the abscissa and strain as...

Embodiment 2

[0031] Embodiment two: if Figure 1-5 As shown, the method for testing nonlinear rheological properties of asphalt under large stress oscillation shear load involved in this embodiment, the specific operation process:

[0032] Step 1: At 30°C, use a dynamic shear rheometer to conduct a stress sweep test with a frequency of 10rad / s on the modified asphalt mixed with 5% SBS, and use an 8mm flat plate for the test. Draw the modulus-stress relationship curve with the stress as the abscissa and the dynamic shear modulus as the ordinate to determine the stress range in the nonlinear rheological region (the results are as follows figure 1 shown).

[0033] Step 2: Within the scope of the nonlinear rheological region ( figure 1 10 stresses are selected as the stress levels in the LAOS stress time sweep.

[0034] Step 3: Use the stress level selected in Step 2 to carry out a time-scanning test on the asphalt under a large oscillating load, with time as the abscissa and strain as the ...

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Abstract

The invention provides a method for testing nonlinear rheological property of asphalt by Large amplitude oscillatory shear stress (LAOS stress), belonging to the field of asphalt rheological propertytesting methods. The method comprises the steps of: utilizing a rheometer to perform stress scanning test for asphalt to determine the nonlinear rheological region of the asphalt; selecting a stress level of a time scanning test in a non-linear region; performing the time scanning test, and selecting a stable strain response waveform period for test analysis; preprocessing the strain response waveform to enable the absolute value of the wave crest to be equal to the absolute value of the wave trough; and finally, obtaining a change rule of parameters reflecting the nonlinear rheological behavior of the asphalt by utilizing the preprocessed waveform data. The method for testing nonlinear rheological property of asphalt by Large amplitude oscillatory shear stress facilitates analysis of thenonlinear rheological property of the asphalt and opens up a new way to accurately represent the complex viscoelastic mechanical behavior of the asphalt under the conditions of high temperature and large stress.

Description

technical field [0001] The invention relates to a method for testing nonlinear rheological properties of asphalt under a large stress oscillation shear load, and belongs to the field of testing methods for rheological properties of asphalt. Background technique [0002] Asphalt is a typical viscoelastic material, and its rheological properties play a vital role in the evaluation of road performance. In practical applications, asphalt is unavoidably subjected to large oscillating shear loads and exhibits nonlinear rheological properties. However, at present, researchers mainly focus on the study of linear rheological properties, and there is little research on nonlinear rheological properties. A complete research system for the nonlinear rheological properties of asphalt. Therefore, based on the LAOS stress time sweep test, a test method for the nonlinear rheological properties of asphalt under LAOS stress is proposed. This method helps to analyze the nonlinear rheological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
CPCG01N11/00
Inventor 单丽岩齐小飞刘爽段祥磊李壮
Owner HARBIN INST OF TECH
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