Asphalt mixture gap distribution uniformity evaluation method
A technology for asphalt mixture and distribution uniformity, which is applied in the fields of material analysis, material analysis, and image analysis using wave/particle radiation. It is convenient for computer simulation modeling, good discrimination, simple and efficient operation
Active Publication Date: 2019-11-12
NANJING FORESTRY UNIV
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Problems solved by technology
In view of the complex distribution of voids, the above indicators are not accurate and deep enough, far from meeting the research requirements
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[0034] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0035] The idea of the present invention is to first obtain the vectorized image of the internal void distribution of the entire asphalt mixture by using industrial CT scanning technology and digital image processing technology; then refine it into several regions, and obtain the characteristics of the voids in each image region parameters to calculate the void uniformity coefficient; finally, the void distribution uniformity of the entire specimen is evaluated according to the variation coefficient of the void uniformity coefficient in different image regions.
[0036] In order to further understand the technical characteristics of the present invention, the evaluation method for the uniformity of void distribution of asphalt mixture will be described below in conjunction with examples. The specific steps are:
[0037] Step 1. Prepare a standard Mar...
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The invention discloses an asphalt mixture gap distribution uniformity evaluation method, and belongs to the technical field of highway asphalt mixture tests. The evaluation method comprises: using industrial CT scanning equipment and an image processing technology to obtain vectorized images of void distribution in different sections of an asphalt mixture test piece; refining the gap distributionvectorized image into a plurality of regions, obtaining gap characteristic parameters in each image region, and calculating a gap uniformity coefficient; and evaluating the gap distribution uniformity of the whole test piece by utilizing the variable coefficients of the gap uniformity coefficients in different image areas. According to the method, the spatial characteristics and the uniformity ofthe internal gap distribution of the asphalt mixture can be comprehensively and accurately obtained. The method has good distinction degree for different mixture types and forming modes, the operation is simple and efficient, and a solid foundation can be laid for the construction of subsequent numerical test pieces and the development of mechanical simulation tests.
Description
technical field [0001] The invention belongs to the technical field of road asphalt mixture test, and relates to a method for evaluating the uniformity of void distribution of asphalt mixture. Background technique [0002] Asphalt mixture can be regarded as a three-phase composite material consisting of asphalt, aggregate and voids. Generally speaking, under certain other conditions, the mechanical and pavement performance of asphalt mixture is affected by the comprehensive effect of void ratio and void distribution characteristics. A large amount of data have shown that the characteristics of porosity are directly related to the water permeability, anti-rutting performance, fatigue life and crack resistance of asphalt pavement. If the porosity is too small, especially for ordinary densely graded mixtures, the asphalt will start to float when it is heated and expanded in summer. Under load, oil flooding and rutting are prone to occur. If the void ratio is too large, water...
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IPC IPC(8): G06T7/00G06T7/13G06T5/00G06T7/62G01N23/046
CPCG06T7/0008G06T7/13G06T7/62G01N23/046G01N2223/03G01N2223/1016G01N2223/401G01N2223/648G06T2207/10081G06T2207/30132G06T5/73G06T5/70
Inventor 李强张卓宇许傲高磊罗桑
Owner NANJING FORESTRY UNIV