Method based on atomic force microscope for researching microscopic characteristics of asphalt

A technology of atomic force microscope and asphalt, which is applied in the direction of scanning probe microscopy, measuring devices, instruments, etc., can solve the problems of one-sidedness and phenomenology, and achieve the effect of simple equipment, easy operation and sample preparation

Inactive Publication Date: 2014-01-22
SOUTHEAST UNIV
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Problems solved by technology

[0002] In recent decades, researchers have conducted extensive and in-depth research on the macroscopic properties of asphalt materia

Method used

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  • Method based on atomic force microscope for researching microscopic characteristics of asphalt
  • Method based on atomic force microscope for researching microscopic characteristics of asphalt
  • Method based on atomic force microscope for researching microscopic characteristics of asphalt

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] (1) Sample preparation

[0022] 1) Heat the asphalt to a liquid state, in which the base asphalt is heated to 120°C; the modified asphalt is heated to 160°C; 2) Take the heated asphalt and drop it on a 40mm×15mm×1mm glass slide; 3) Put the slide into Heat it in an oven for 10 minutes to spread the asphalt evenly, with a diameter of about 1 cm, and take it out to cool naturally as an asphalt sample.

[0023] (2) Surface topography imaging

[0024] The atomic force microscope uses a probe located at one end of the cantilever that is very sensitive to external forces to detect the interaction force between the tip and the sample to image the surface of the sample.

[0025] The imaging mode is tapping mode. The silicon nitride cantilever probe is used to scan and image the sample. The standard elastic number of the cantilever beam is 42N / m, the probe height is 11um, the cantilever length is 125um, the resonance frequency is 260kHz, and the scanning range is 40um. ×40um, i...

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Abstract

The invention provides a method based on an atomic force microscope for researching microscopic characteristics of asphalt. The method comprises the following steps: preparing an asphalt sample for atomic force microscope observation, imaging surface morphology, performing high-precision and quantitative analysis on roughness and analyzing adhesion; (1) preparing the asphalt sample so as to enable the asphalt sample to meet observation requirements of the atomic force microscope; (2) imaging the surface morphology: observing the size and density of a honeycomb structure in a selected area on the surface of the asphalt sample from a two-dimensional angle and with a high resolution by using the atomic force microscope; (3) performing high-precision and quantitative analysis on the roughness: acquiring a roughness parameter in the image area of the atomic force microscope by using proper data analysis software; (4) analyzing the adhesion: acquiring a force curve by using the atomic force microscope, and acquiring an adhesion value through the force curve; (5) quantitatively evaluating the adhesiveness and self-healing performance of the asphalt according to the roughness and adhesion. The method provides an effective way for recognizing and analyzing material properties from a microscopic view for researchers.

Description

technical field [0001] The invention relates to the field of asphalt microscopic performance evaluation, in particular to a research method based on an atomic force microscope for studying the change of asphalt material form before and after modification or aging, and evaluating the adhesion and self-healing ability of the asphalt. Background technique [0002] In recent decades, researchers have conducted extensive and in-depth research on the macroscopic properties of asphalt materials. However, due to the limitations of research scales and methods, these research results are mostly phenomenological and one-sided. If you want to fully understand the properties of asphalt and make physical and chemical modifications for a certain characteristic to design materials that meet actual needs, you must study asphalt from the micro level and deduce the macro and micro laws from the micro perspective. With the advancement of science and technology, more and more instruments make th...

Claims

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Application Information

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IPC IPC(8): G01Q60/24G01Q30/20
Inventor 杨军龚明辉朱薇薇
Owner SOUTHEAST UNIV
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