Bituminous mixture uniformity evaluation method based on virtual split test

Abstract

The invention discloses a bituminous mixture uniformity evaluation method based on a virtual split test. The method comprises the following steps: firstly acquiring a cylindrical bituminous mixture test piece; then acquiring multiple two-dimensional horizontal cross section images of the bituminous mixture test piece, and converting the acquired images into grayscale images; and then obtaining boundary coordinates of each aggregate and each gap by utilizing the cross section and grayscale images of the bituminous mixture test piece, building a three-dimensional discrete element model for a bituminous mixture test piece split test and performing the virtual split test, thus obtaining split strength, and calculating a variable coefficient of the split strength index, so that uniformity of abituminous mixture is evaluated. The method disclosed by the invention is based on the virtual split test, can perform quantitative evaluation on the uniformity of the bituminous mixture by adopting the variable coefficient of the split strength index and has strong industrial applicability and operability; and compared with other methods, the method disclosed by the invention is more scientific and representative in uniformity parameter selection, and an evaluation result on the uniformity of the bituminous mixture is more accurate.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for evaluating the uniformity of asphalt mixture based on a virtual splitting test. Background technique [0002] The uniformity of asphalt mixture (application number 201310542528.7) directly determines the road performance and service life of asphalt pavement, and affects the maintenance cost of asphalt pavement. Among the many factors that potentially cause early failure of hot mix asphalt pavement, the most serious is the inhomogeneity of the asphalt mixture. Asphalt mixture is composed of four parts: asphalt mortar, (coarse / fine) aggregates, additives and voids. The inhomogeneity of asphalt mixture is a comprehensive reflection of the inhomogeneity of components in asphalt mixture. The gradation of aggregates and (or) asphalt content in uneven asphalt mixtures does not match the requirements of the initial on-site mix ratio, resulting in large changes in ...

AI Technical Summary

Problems solved by technology

The main reasons are as follows: (1) The influence of uniformity on the performance of asphalt mixture is ignored, and people do not give enough understanding to the importance of the uniformity of asphalt mixture

(2) The internal structure of asphalt mixture is very complex. Through traditional research methods, it is difficult to obtain the internal structure of asphalt mixture, and it is difficult to determine the uniformity of asphalt mixture.

[0006] However, the above research on the uniformity of asphalt mixture, the selection and determination of the uniformity index parameters are not scientific, not comprehensive, not strong representative, limited to the aggregate and two-dimensional layer, the results are biased, and can only partially reflect the uniformity the reality of sex

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