<p><p><strong>References:<br></strong><em>Dumas and Beaton (1992)</em><em>Elias et al. (2006a)</em><em>Han (1998)</em><em>Lukas (1986)</em><em>Lukas (1995) </em><em>Mackiewicz and Camp (2007)</em><em>Mitchell (1981b)</em><em>Schaefer et al. (1997)</em></p><p><strong>Method Summary</strong></p><p>Cone penetration tests should be performed both before and after compaction to estimate relative changes in soil properties. When compaction has been completed, the CPTs should not be performed until the excess pore water pressures have dissipated.</p><p><strong>Accuracy and Precision<br></strong>CPTs provide a good estimate of the change in relative density.</p><p><strong>Adequacy of Coverage<br></strong>Cone penetration tests can be placed to get an accurate picture of the entire subsurface profile. However, they do not yield soil samples.</p><p><strong>Implementation Requirements<br></strong>CPTs are a standard test used in geotechnical investigation and are relatively inexpensive and simple to perform. The test generates no spoils, but does not perform well in gravels or soils with large debris.</p><p><strong>General Comments<br></strong>CPTs can be used in any deep dynamic compaction program for improvement of cohesionless soils that are free of excessive amounts of gravel or cobbles. CPTs can also be useful in soils with several different layers where each layer may experience a different degree of improvement. As post-compaction aging effects may be significant in many soils, a minimum time period between the end of compaction and the start of CPT testing should be specified.</p></p>