AASHTO T 381-18 PDF Download

AASHTO T 381-18 is a standard method of test that outlines the procedures for determining the shape properties of aggregates using digital image analysis. This technique involves analyzing digital images of aggregate particles to measure various shape parameters and properties. The purpose of this standard is to provide a standardized and reliable method for evaluating aggregate shape, which plays a significant role in the performance of asphalt and concrete mixtures.

The standard covers the equipment and materials required for conducting the test, including digital cameras, image analysis software, and calibration standards. It specifies the procedures for preparing the aggregate samples, capturing digital images, and processing the images to extract the desired shape parameters.

The digital image analysis technique allows for accurate and efficient measurement of aggregate shape properties such as angularity, flatness, elongation, and texture. These shape characteristics can influence the workability, compaction, and strength of asphalt and concrete mixtures, making them essential parameters to assess in the design and quality control of these materials.