Method for reconstructing three-dimensional model of asphalt mixture

Abstract

The invention discloses a method for reconstructing a three-dimensional model of an asphalt mixture. The method comprises the following steps: firstly, performing CT scanning on an asphalt mixture test piece to obtain a mixture image; continuously reading a multi-layer CT image; then carrying out filtering, denoising and sharpening enhancement on the multi-layer CT image, and in the CT image, greywhite representing aggregate, black representing void, and dark grey representing asphalt mortar; segmenting the image, and segmenting the aggregate, the asphalt mortar and the void three-phase material; performing volume rendering on the segmented aggregate, asphalt and void three-phase material to generate a three-dimensional model of visual aggregate, asphalt mortar and voids; and finally, carrying out mesh generation on the generated visual three-dimensional model to generate a three-dimensional mesh model capable of numerical simulation. According to the method, avizo is used for directly carrying out image denoising, sharpening and other enhancement processing on the multi-layer CT image; the three-phase material of the multi-layer CT image is directly segmented, so that the workload is reduced, operation is easy, and the trueness is high; and the three-dimensional visualization model is directly converted into the three-dimensional grid model, so that the working efficiency isimproved.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for reconstructing a three-dimensional model of an asphalt mixture, in particular to a method for rapidly reconstructing a three-dimensional model of an asphalt mixture based on CT images and avizo software. Background technique [0002] Asphalt mixture is a heterogeneous multi-layer composite material composed of asphalt mortar, aggregate, and voids. How to effectively restore the three-phase material of asphalt mixture and generate virtual digital specimens is the key to simulate and analyze the mechanical properties of asphalt mixture. foundation and premise. [0003] The research on extracting three-phase materials of asphalt mixture based on images is mainly concentrated in two directions: two-dimensional plane and three-dimensional three-dimensional. The two-dimensional plane mainly studies the characteristics of plane aggregates and voids, an...

AI Technical Summary

Problems solved by technology

Although the extraction of two-dimensional and three-phase information and the simulation of plane mechanics can solve the analysis of information related to the xy plane of asphalt mixture, it cannot do the research on three-dimensional macroscopic mechanics and loses the information related to the three-dimensional z-axis direction. Extremely important

Both method 1 and method 2 above require a large amount of program writing in matlab, and the programming is difficult. In the follow-up, it is necessary to solve the problem of importing the built model into the finite element software (ansys), which is difficult to operate, and these two methods require computer Higher, in summary, method 1 and method 2 are more difficult to implement

The third is to use an infrared scanner to scan the asphalt mixture specimen to directly obtain the three-dimensional shape model. The three-dimensional model obtained by this method is an appearance model, which loses the internal aggregates, asphalt mortar, voids and other mesostructural properties of the asphalt mixture. It is generally used in Morphological analysis, mechanical analysis is not used

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