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Abstract

The uniformity of asphalt mixture has an important influence on its physical and mechanical properties and is an important component and research object of the asphalt mixture genome. In order to provide a reference for the fine design of asphalt mixture, this paper, based on digital image technology, analyzed the uniform characteristics of the coarse aggregate distribution of Marshall specimen under different compaction conditions for three groups of different gradation levels and then evaluated the relationship between the quantitative index of coarse aggregate distribution uniformity and the macroscopic mechanical properties of asphalt mixture. The results show that the coarse aggregate distribution of Marshall specimens has the characteristics of slightly less at both ends and more in the middle, and the maximum amount of coarse aggregate appears at 1/3–2/3 of the height of the specimen. The increase in compaction times helps to increase the distribution uniformity of the asphalt mixture. The coarse gradation has an important effect on the distribution uniformity of coarse aggregates. The coarse gradation has better uniformity. For aggregates with different particle sizes, smaller particle size indicates better distribution uniformity. The standard difference can be used as a quantitative evaluation index of distribution uniformity of coarse aggregate. With the decrease in standard deviation, the asphalt mixture has better and better rutting resistance.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.036

First Page

214

Last Page

218

Submission Date

March 2025

Reference

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