<p><p><strong>Reference(s):</strong></p><p><em>Aiban (2006)<br>Hicks et al. (1995)<br>NAIK (2004)<br>Reindl (2003)<br>RMT NCASI (2003)<br>Schimmoller et l. (2000)<br>Solanski (2007)</em></p><p><strong>Method Summary</strong></p><p>Soils consist of particles with various shapes and sizes. This test method (ASTM D6913) is used to separate particles into size ranges and to determine quantitatively the mass of particles in each range. These data are combined to determine the particle-size distribution (gradation). The test method uses a square opening sieve criterion in determining the gradation of soil between the 3-inch (75-mm) and No. 200 (75-µm) sieves.</p><p><strong>Accuracy and Precision</strong></p><p>The particle gradation test is widely accepted in geotechnical engineering and provides consistent results for a wide range of materials and gradations.</p><p><strong>Adequacy of Coverage</strong></p><p>The QC/QA method can be implemented to provide an adequate assessment of the entire quantity of improved material, using a reasonable number of tests.</p><p><strong>Implementation Requirements</strong></p><p>Implementation requirements (cost, personnel, training, equipment, and time) for the QC/QA method are not excessive.</p></p>