A determination method of asphalt material fatigue evaluation index based on Fourier rheology
A technology of asphalt material and fatigue evaluation, applied in the direction of using stable shear force to test material strength, analyze materials, material inspection products, etc., can solve problems such as lack
Active Publication Date: 2021-11-09
HARBIN INST OF TECH
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Problems solved by technology
However, the above fatigue evaluation indicators are all proposed on the basis of the stress / strain response peak value, and they all have a certain average meaning, which conceals the information of each time node of the output response waveform during the fatigue damage process of the asphalt material, and lacks the specificity of the strain-time response. Analysis of the complete spectrum
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[0052] The dynamic shear rheometer in the stress control mode used in this example is the DHR series rheometer of TA Company in the United States. The asphalt material is 70# base asphalt with a flat plate shape, a thickness of 2mm, and a diameter of 8mm. The test temperature is 25°C at room temperature. The loading frequency of the dynamic shear rheometer is 10rad / s.
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Abstract
The invention discloses a method for determining fatigue evaluation indexes of asphalt materials based on Fourier rheology, and relates to a method for determining fatigue evaluation indexes of asphalt materials. First, the stress sweep test is carried out on the asphalt material to determine the stress value imposed by the fatigue test; secondly, the standard mode time sweep test is carried out to determine the time required for the end of the test; and then the transient time sweep is selected according to the dynamic shear modulus versus time curve The test node of the test; then the standard mode time-sweep test is carried out first, and then the transient mode time-sweep test is carried out at the test node, and the cycle is completed until the end of the test; then the analysis based on the Fourier rheology method is based on the transient mode time-sweep test. The strain response waveform is used to study the change law of the third-order harmonic strength ratio with the number of loads; finally, the fatigue evaluation index of asphalt material is determined according to the slope change of the curve. A new method for fatigue evaluation of asphalt materials is provided, which is helpful to further understand the evolution law of fatigue damage.
Description
technical field [0001] The invention relates to a method for determining an asphalt material fatigue evaluation index, in particular to a method for determining an asphalt material fatigue evaluation index based on Fourier rheology, which belongs to the technical field of material mechanical performance detection. Background technique [0002] Under the coupling effect of complex environment and traffic load, the performance of asphalt pavement gradually declines, resulting in frequent occurrence of rutting and fatigue cracks, which seriously affect the service life of asphalt pavement. Among them, the fatigue damage problem is the original problem of the basic theory and design maintenance of asphalt pavement structure. Therefore, it is important to propose an accurate asphalt material fatigue evaluation index for selecting high-quality asphalt materials, improving the performance of asphalt pavement, prolonging the service life, and reducing maintenance and repair costs. s...
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IPC IPC(8): G01N3/32G01N3/24G01N33/42
CPCG01N3/24G01N3/32G01N33/42G01N2203/0005G01N2203/0025G01N2203/0073G01N2203/0075
Inventor 齐小飞单丽岩谢紫菀王亚杰欧祖馨
Owner HARBIN INST OF TECH