Asphalt Fatigue Performance Test and Evaluation Method Separated from Thixotropy and Nonlinear Effects

A technology of fatigue performance testing and evaluation method, applied in the field of asphalt damage identification, which can solve the problem that asphalt cannot accurately characterize the degree of asphalt damage.

Active Publication Date: 2022-04-26
HARBIN INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing asphalt fatigue damage performance evaluation method is affected by thixotropy and nonlinearity and cannot accurately characterize the damage degree of asphalt, and provides a method for testing and evaluating asphalt fatigue performance that separates thixotropy and nonlinear effects , used to study the fatigue damage evolution law of asphalt

Method used

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  • Asphalt Fatigue Performance Test and Evaluation Method Separated from Thixotropy and Nonlinear Effects
  • Asphalt Fatigue Performance Test and Evaluation Method Separated from Thixotropy and Nonlinear Effects
  • Asphalt Fatigue Performance Test and Evaluation Method Separated from Thixotropy and Nonlinear Effects

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specific Embodiment approach 1

[0029] Specific implementation mode 1: In this implementation mode, the asphalt fatigue performance test and evaluation method that separates the influence of thixotropy and nonlinearity is implemented according to the following steps:

[0030] Step 1. Determine the load level

[0031] The dynamic shear rheometer (DSR) is used to carry out the strain scanning test on the asphalt sample, with the strain level ε as the abscissa and the dynamic shear modulus ratio As the ordinate, the strain-dynamic shear modulus ratio curve is obtained, and the strain value ε corresponding to the dynamic shear modulus reduced to 90% of the initial value is obtained through the strain-dynamic shear modulus ratio curve t , strain value ε t is the critical value of the linear viscoelastic range, and then select ε L and ε S As the load values ​​of high strain level time sweep and low strain level time sweep, where ε L >ε t , ε S t ;

[0032] Step 2. Determine the test node

[0033] High-strai...

specific Embodiment approach 2

[0044] Embodiment 2: This embodiment differs from Embodiment 1 in that the diameter of the parallel plates used in the strain scanning test in step 1 is 8 mm, the distance between parallel plates is 2 mm, the test temperature is 25° C., and the loading frequency is 10 Hz.

specific Embodiment approach 3

[0045] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is the dynamic shear modulus ratio in step one in is the dynamic shear modulus value corresponding to the kth strain level, is the dynamic shear modulus value corresponding to the first load level.

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Abstract

A test and evaluation method for asphalt fatigue performance that separates the effects of thixotropy and nonlinearity. It aims to solve the problem that the existing test method for asphalt fatigue damage performance based on dynamic shear modulus cannot accurately characterize the degree of asphalt damage due to the influence of thixotropy and nonlinearity. question. Test and evaluation methods: 1. Determine the critical value of the linear viscoelastic range; |G*| Set n low-strain level scanning test nodes on the curve; 3. Carry out an improved time-scanning test; 4. Based on the phase angle and dynamic shear modulus data obtained from the first test node, the δ‑|G*| relational model Carry out fitting to obtain the asphalt thixotropy characteristic relationship model; Fifth, calculate the damage degree. The asphalt fatigue performance test and evaluation method that separates the influence of thixotropy and nonlinearity proposed by the present invention can effectively eliminate the influence of thixotropy and nonlinearity on modulus, accurately quantify the real damage degree of asphalt, and is beneficial to analyze the evolution of asphalt fatigue damage law.

Description

technical field [0001] The invention belongs to the field of asphalt damage identification, and in particular relates to a method for testing and evaluating the fatigue performance of asphalt. Background technique [0002] Asphalt is an important component material of asphalt pavement, which plays a key role in the anti-fatigue performance of asphalt pavement. In-depth study of the fatigue damage mechanism of asphalt and accurate characterization of the fatigue damage degree of asphalt are of great significance for the construction and maintenance of asphalt pavement. [0003] At present, the time sweep test is the most important test method used to evaluate the fatigue performance of asphalt. The loading time-dynamic shear modulus curve obtained from the test is widely used in the analysis of asphalt fatigue performance. The characterization of asphalt fatigue damage based on dynamic shear modulus is an important means to study the evolution law of asphalt fatigue damage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32G06F30/20G06F119/02G06F119/04
CPCG01N3/32G06F30/20G01N2203/0005G01N2203/0073G06F2119/04G06F2119/02
Inventor 吕慧杰谭忆秋叶万里王伟任志彬张俊杰
Owner HARBIN INST OF TECH
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