<p><p><strong>References:<br></strong><em>Christopher et al. (2010)<br>Uretek (2004)</em></p><p><strong>Method Summary</strong></p><p>The Dynamic Cone Penetration (DCP) test is used to assess the compaction improvement depth by comparing pre- and post-stabilization results. DCP is generally used as a QA method in pavement foundation layers down to 2-meter depths. Literature shows difficulties arise when using DCP in soil with large particles or boulders.</p><p>DCP test method is described in ASTM D6951. DCP test method involves driving a cone tip into the soil by lifting an 8-kg sliding hammer to a 575-mm drop height and then releasing it. The total penetration for a given number of blows is then measured and recorded as mm/blow (penetration resistance). ASTM D6951 provides correlations between California Bearing Ratio (CBR) and mm/blow for different soil types.</p><p><strong> </strong><strong>Accuracy and Precision</strong></p><p>For subsurface conditions with large boulders or rocks, testing may be difficult. ASTM D6951 indicates that the repeatability standard deviation of the DCP test is less than 2 mm/blow.</p><p><strong> </strong><strong>Adequacy of Coverage </strong></p><p>DCP testing can determine the soil condition locally. Adequacy of coverage will depend on the number of tests performed.</p><p><strong> </strong><strong>Implementation Requirements </strong></p><p>The equipment is easy to operate and the test requires minimal training but some experience.</p><p><strong>General Comments</strong></p><p>This test method is useful for QA. This method can also be used for QC to assess improvements in subsurface conditions during the injection of foam fill.</p></p>