New Test Method for Determining Coarse Aggregate Size and Shape Characteristics Using Digital Imaging
1. Scope
This test method covers the determination of particle size and shape characteristics of coarse aggregate using digital imaging techniques. It is applicable to aggregates that can be visually resolved and segmented using image processing software. While physical sieving is not required for this method, it may be used to complement image-based results or to support specific quality control objectives.
Keywords
Coarse aggregate, digital imaging, particle size, particle shape, angularity, aspect ratio, image analysis, Feret diameter, roundness, roughness, flatness, two-dimensional segmentation, particle size distribution, image-based measurement
Rationale
Traditional methods such as sieve analysis and manual shape classification remain widely used and effective, but they have limitations. While well standardized for measuring particle size, they offer limited insight into particle shape and surface features. In contrast, image-based methods enable more frequent and objective measurements, providing richer data on particle characteristics.
This standard provides a method for capturing appropriate digital images of coarse aggregate and outlines how to calculate standardized size and shape metrics such as aspect ratio, angularity, flatness, and more. These definitions support consistent communication and reduce confusion between research and industry, where terminology and calculation methods often differ.
The method accommodates various imaging setups and does not require major changes to existing workflows. It is intended to complement traditional tests, offering an additional tool to improve understanding of aggregate variability and support better quality control.
The title and scope are in draft form and are under development within this ASTM Committee.
Work Item Status
Date Initiated: 10-14-2025
Technical Contact: Alex Hanmore
Item: 001
Ballot: C09.20 (25-05)
Status: In Balloting