Coarse aggregate angularity evaluation method based on digital image analysis technology

Abstract

The invention relates to a coarse aggregate angularity evaluation method based on the digital image analysis technology. The method comprises the following steps that coarse aggregate is selected, and the performance of the coarse aggregate is tested; washing and screening are carried out, and the coarse aggregate with the single grain size is obtained; digital image collecting equipment is utilized for acquiring images of the coarse aggregate; an image processing system is utilized for processing and recognizing the acquired images; the area, perimeter, long axis, short axis and other basic parameters of a single coarse aggregate particle are acquired; the coarse aggregate angularity is quantized, and quantitative indexes comprise roundness, angularity, the average minimum curvature radius, circularity and other indexes; the angularity of the coarse aggregate is evaluated, and reference is provided for coarse aggregate selection. The coarse aggregate angularity evaluation method is based on the digital image technology, the angularity of the coarse aggregate can be evaluated through the quantitative indexes, reference value is provided for coarse aggregate selection, and therefore the coarse aggregate angularity evaluation method has obvious practical value.

Description

technical field [0001] The invention belongs to the field of road building materials, and relates to a method for evaluating the angularity of coarse aggregates based on digital image analysis technology. Background technique [0002] Angularity of coarse aggregates mainly reflects the degree of protrusion on the particle outline of coarse aggregates, and is an important factor affecting the formation of intercalated structure of coarse aggregates. The impact on the ease of construction and road performance of asphalt mixture is very significant. [0003] Wang Hainian and others proposed to use the MASCA (Morphology analysis system of coarse aggregate) method to evaluate the angularity of coarse aggregates. The evaluation methods include particle perimeter method and fractal geometry method. The results of the study found that the evaluation results of the two methods for the angularity of coarse aggregates are basically consistent, showing similar changes. [0004] Wang H...

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Problems solved by technology

However, the disadvantage of the indirect method is that it cannot directly and effectively characterize the morphological characteristics of each individual coarse aggregate particle, and the target is not clear

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