Average Least Dimension (ALD) | Austroads
direct measurement (AS 1141.20.1 for 10 mm or larger nominal size or AS 1141.20.2 for 5 mm and 7 mm nominal sizes) AS 1141.20.3 involving calculating (or using a nomograph) the ALD from the grading, median size, and flakiness index; NZS 4407 using Test Method 3.13: The Size and Shape of Aggregate Particles.