Method for testing micro-scale strain of asphalt cement

Abstract

The invention discloses a method for testing micro-scale strain of an asphalt cement. The method comprises the following specific steps: preparing an asphalt cement / graphene sample; preparing a Ramansystem; calibrating sensing parameters; carrying out the Raman spectrum measurement; and carrying out spectral data processing and strain calculation. Based on the characteristic that the Raman spectrum technology can perform mechanical test on the micro-scale of the material, the single-crystal single-layer graphene film is used as a strain sensing medium and covers the surface of the asphalt cement, so the method for testing the strain of the asphalt cement under the non-contact micro-scale is realized. The method is characterized in that the thickness of single-layer graphene is only the thickness of a single atomic layer; during loading, the load can be easily transferred to the graphene from the asphalt cementing material; the method has the advantages of simple process, no patch effect, only two-dimensional component transmission strain, no longitudinal distribution, avoiding of the complexity of the analysis process caused by the distribution of three-dimensional non-uniform stress, and the realization of the quantitative measurement of the micron-scale resolution strain and the distribution rule of the micron-scale resolution strain on the surface of the asphalt cement.

Description

technical field [0001] The invention belongs to the field of micro-scale stress / strain testing of asphalt cement, and specifically relates to the technical field of testing the deformation and stress of asphalt cement at the micron scale by using a spectroscopic analysis method, in particular to an asphalt cement microscale Test method for scale strain. Background technique [0002] With the continuous development and integration of solid mechanics and material science, the research scale of materials has gradually deepened from the initial single macro scale to the fine, micro and even nano scales, in order to study the relationship between the macro properties of materials and their fine and micro structures or defects. . Based on the composition of the multiphase composite structure of asphalt pavement materials, its characteristic scale can be divided into four levels: nanoscale, microscale, mesoscale, and macroscale. The difference in characteristic properties of engi...

AI Technical Summary

Problems solved by technology

For example, microscopic testing instruments represented by nano-indentation testers, atomic force microscopes, transmission electron microscopes, scanning electron microscopes, etc., can realize material characterization and morphology observation at the micron or even nanometer scale, but the above-mentioned instruments are difficult for the material to be tested due to the load Or the quantitative detection of the mechanical properties of the deformation of objects caused by environmental changes is powerless.

Among all kinds of spectroscopic measurement techniques, micro-Raman technology can realize the micron-scale strain measurement (with a resolution of 0.5 μm) of Raman active materials, but this technology cannot be directly used in non-Raman active materials. Mechanical measurement

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