<p><p><h2>Commentary</h2>The costs of deep mixing on a highway project are typically captured in a contract bid item measured by the cubic yard (CY). Included in this bid item are the material, equipment, labor, and incidentals to construct a deep mixed column.

<p><p><figure id='attachment_2569' style='max-width:953px' class='caption alignnone'><img class="wp-image-2569 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photograph showing equipment used to install deep-mixed method columns." width="953" height="663" /><figcaption class='caption-text'> After Elias et al.

<p><p><strong>Reference(s):</strong></p><p><em>Broms (2003)<br>Bruce (2001)<br>Cali et al. (2005a)<br>CDIT (2002)<br>Lambrechts (2005)<br>Terashi and Kitazume (2009)</em></p><p><strong>Method Summary</strong></p><p>Installation and testing of field test columns is a key pre-production QC/QA process for many DMM projects.

<p><p><strong>Reference(s):</strong></p><p><em>Åhnberg et al. (2009)<br>Larsson (2005)<br>Staab et al. (2005)</em></p><p><strong>Method Summary</strong></p><p>Geophysical methods consist of both seismic and electromagnetic imaging methods. Geophysical tests are able to determine general properties of an entire column of treated soil as opposed to a small sample from within a column. Seismic testing methods include down-hole and cross-hole logging.

<p><p><figure id='attachment_3403' style='max-width:1024px' class='caption aligncenter'><img class="wp-image-3403 size-large" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photograph of the completed overpass at the intersection of Glen Road and U.S.

<p><p><div></p><p><figure id='attachment_3401' style='max-width:626px' class='caption alignleft'><img class="wp-image-3401 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photograph of equipment used to install lime-cement columns during construction of I-15 in Utah." width="626" height="329" /><figcaption class='capti