<p><p><strong>Reference(s):</strong></p><p><em>Aiban (2006)<br>Benson and Khire (1994)<br>Cieselski and Collins (1993)<br>FHWA (1998)<br>FIRST (2004)<br>Griffiths &amp; Krstulovich (2002)<br>IEC (2008)<br>IMTIAZ (1991)</em></p><p><strong>Method Summary</strong></p><p>California Bearing Ratio (CBR) is used to evaluate the potential strength of subgrade, subbase, and base course material, including recycled materials for use in road and airfield pavements. The CBR value obtained in this test forms an integral part of several flexible pavement design methods.</p><p><strong>Accuracy and Precision</strong></p><p>The CBR 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><strong>General Comments</strong></p><p>The CBR test is used in the evaluation of these blends and was considered the decisive parameter. In all CBR tests, samples were prepared according to ASTM Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort 56,000 ft-lbf/ ft³ (2700 kN-m/m³) (D 1557), Method D, using the modified Proctor compaction.</p></p>