Percent Fractured Face Test

A sample retained on the 4.75 mm (No. 4) sieve is collected and the number of particles with fractured faces is compared to the number of particles without fractured faces. A fractured face is defined as an “angular, rough, or broken surface of an aggregate particle created by crushing, by other artificial means, or by nature” (ASTM, 2000[1]). In order for a face to be considered fractured it must constitute at least 25 percent of the maximum cross-sectional area of the rock particle.

Standard Test Methods

  • ASTM D 5821: Determining the Percentage of Fractured Particles in Coarse Aggregate

Footnotes    (↵ returns to text)
  1. American Society for Testing and Materials (ASTM).  (2000).  Annual Book of ASTM Standards, Section four: Construction.  Vol. 4.03.  American Society for Testing and Materials.  West Conshohocken, PA.