ASTM D4791

Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate

Applicability: ASTM D4791 is a standard test method used to determine the percentages of flat particles, elongated particles, or flat and elongated particles in coarse aggregates. Method A reflects the original procedure and is intended for non-Superpave applications, while Method B compares the maximum particle dimension to the minimum particle dimension and is intended for use with Superpave specifications.

Purpose: The purpose of ASTM D4791 is to evaluate the particle shape of coarse aggregate, which influences the properties of some construction materials and may affect their placement and consolidation. Results are used to check compliance with specifications that limit flat and elongated particles or to determine the relative shape characteristics of coarse aggregates.