Full Name

AASHTO T311 – Standard Method of Test for Grain-Size Analysis of Granular Soil Materials


This method covers the determination of the particle size distribution of granular soil material.

This method utilizes the 6.3-mm sieve size for separation purposes. However, the sample tester may use an alternative sieve size (i.e., 4.75 mm, 2.00 mm). In this case, the alternative sieve size used must replace the 6.3-mm size throughout this procedure.

Specifications for granular soil material, which reference this method, usually contain grading requirements that include both coarse and fine fractions in sizes between 100 mm and 0.075 mm.


coarse soil; fine soil; gradation; particle size; sieving; soil sizes