<p><p><strong>References:<br></strong><em>Fox and Cowell (1998)</em></p><p><strong>Method Summary</strong></p><p>Fox and Cowell (1998) provide a good summary of DCP testing for this application, which is paraphrased below.</p><p><em>DCP testing is used to verify graded base course aggregate densification within the top few feet of the pier element after tamping energy has been applied. DCP testing does not need to be conducted on every pier element, unless unacceptable DCP test results, questionable aggregate moisture content, or questionable aggregate gradation requires additional verification of aggregate densification. DCP testing is inappropriate for clean stone and is only used for graded base course stone. </em></p><p><strong>Accuracy and Precision</strong></p><p>DCP blow counts are empirically correlated to density, and have proven to give reasonably accurate results.</p><p><strong>Adequacy of Coverage</strong></p><p>DCP testing only provides an indication of density in the vicinity directly beneath the cone.</p><p><strong>Implementation Requirements </strong></p><p>This method can be quickly and easily implemented.</p><p><strong>General Comments</strong></p><p>Aggregate density, and therefore DCP testing, is important for all rammed aggregate pier applications.</p></p>