Asphalt microcosmic dynamic rheological property test method

A testing method and rheological technology, applied in flow characteristics, measuring devices, instruments, etc., can solve the problems of limited test frequency range, long test time, and inability to reflect the microscopic mechanical properties of asphalt, and achieve the effect of improving test efficiency

Active Publication Date: 2019-08-30
HARBIN INST OF TECH
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Problems solved by technology

The test time of this method is long, the test frequency range is ...

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  • Asphalt microcosmic dynamic rheological property test method
  • Asphalt microcosmic dynamic rheological property test method
  • Asphalt microcosmic dynamic rheological property test method

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Embodiment 1

[0015] Embodiment one: if Figure 1-3 As shown, a kind of asphalt microscopic dynamic rheology test method involved in this embodiment, the specific steps are:

[0016] Step 1: Keep the temperature of the test environment constant, use the atomic force microscope to test the asphalt sample, get the force curve, and use the Hertz model to fit the force curve to get the corresponding elastic modulus, repeat the test three times to get the average value of the modulus As the modulus of the asphalt sample; according to the corresponding relationship between the measured modulus of the asphalt sample and the scope of application of the probe, determine the stiffness coefficient of the probe required for the microscopic dynamic rheological performance test and the type of probe used;

[0017] Step 2: Scan the asphalt microscopic topography and select a specific range as the test area, establish a rectangular test lattice in the test area, use the points in the lattice as test points...

Embodiment 2

[0020] Embodiment two: if Figure 1-3 As shown, a kind of asphalt microscopic dynamic rheology test method involved in this embodiment, the specific operation process is:

[0021] Step 1: Under the test conditions of 23°C at room temperature (the test temperature range is relatively large, and the temperature can be controlled and can be carried out at room temperature), use an atomic force microscope (AFM) to test a No. 90 matrix asphalt sample, and obtain its force curve ( Such as figure 1 Shown), using the Hertz model to fit the corresponding elastic modulus through software, repeat the test three times and get the average value of 730MPa. According to the corresponding relationship between this value and the scope of application of the probe, it is determined that the probe stiffness coefficient required for this microscopic dynamic rheological test is 2.8N / m;

[0022] Step 2: Scan the asphalt microscopic topography and select a range of 25μm×25μm as the test area, estab...

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Abstract

The invention provides an asphalt microcosmic dynamic rheological property test method, and belongs to the field of a asphalt dynamic rheological property test. The asphalt microcosmic dynamic rheological property test method comprises the steps of: firstly, carrying out a common force curve test on an asphalt sample by utilizing an atomic force microscope so as to determine a type of a probe required for the test; then scanning an asphalt microcosmic topography and selecting a test point; controlling the atomic force microscope probe to be pressed into the surface of an asphalt material; whenan acting force between a tip of the probe and the asphalt sample reaches a certain value, keeping the position of the probe unchanged, vibrating inside asphalt under a certain frequency and amplitude and recording a force curve in the vibrating process; and after vibration is finished, lifting up the probe for a certain time until the surface of asphalt is stable, and repeating the steps above under the same amplitude and different frequencies. According to the invention, the microcosmic dynamic rheological property of the asphalt is tested, a microcosmic dynamic viscoelastic parameter of the asphalt can be obtained, and the asphalt microcosmic dynamic rheological property test method is helpful for knowing the microcosmic rheological property of the asphalt and has very important significance for establishing an asphalt microcosmic structure and macroscopic performance relationship and improving asphalt performance test efficiency.

Description

technical field [0001] The invention relates to a method for testing the microscopic dynamic rheology of asphalt, which belongs to the field of testing the dynamic rheology of asphalt. Background technique [0002] Dynamic rheology is one of the important rheological properties of asphalt, which can reflect the mechanical properties of asphalt under dynamic load. The conventional dynamic rheological test of asphalt refers to using a dynamic shear rheometer to apply a sinusoidal shear load to the asphalt and test its dynamic modulus, phase angle and other viscoelastic parameters, and analyze the storage modulus, loss modulus, phase angle, etc. Variation law of viscoelastic parameters such as angle with load frequency. The test time of this method is long, the test frequency range is limited, and the micromechanical properties of asphalt cannot be reflected. Therefore, a test method for asphalt microscopic dynamic rheology based on atomic force microscope is designed, which ...

Claims

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Application Information

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IPC IPC(8): G01N11/10
CPCG01N11/10
Inventor 单丽岩张恩浩李东盛王建杰刘爽
Owner HARBIN INST OF TECH
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