<p><p><div></p><p><figure id='attachment_3483' style='max-width:769px' class='caption aligncenter'><img class="wp-image-3483" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photography of a Caterpillar CS-653 vibratory smooth drum roller compacting soils on Trunk Highway in Minnesota." width="769" height="646" /><figcaption class='caption-text'> Caterpillar CS-563 vibratory smooth drum roller. (From White, D., M. Thompson, P. Vennapusa, and J. Siekmeier. Implementing Intelligent Compaction Specification on Minnesota TH-64: Synopsis of Measurement Values, Data Management, and Geostatistical Analysis. In Transportation Research Record: Journal of the Transportation Research Board, No. 2045, Figure 2 (a), p. 3. Copyright, National Academy of Sciences, Washington, D.C., 2008. Reproduced with permission of the Transportation Research Board.)</figcaption></figure></p><p></div><div><h2>Project Summary/Scope:</h2>The TH64 reconstruction project in Akeley, MN was the first earthwork project in the United States to require IC technology as part of QC/QA. The project comprised of widening and reconstructing 10 km of an existing alignment. LWD tests performed at the surface were affected by the loose surface material, which in turn affected the correlations with Compaction Meter Value (CMV).</p><p>Subsurface Conditions: Fill material comprised of material classified as poorly graded sand (SP) to well-graded sand with silt (SW-SM).</p><p>Prior to production compaction, control sections were constructed to determine target values (referred to as IC-TV) for CMV. Separate control sections were constructed and tested for different types of fill sections of the project. For establishing the target values from collected CMV data, an iterative method was adopted. Following each roller pass, the data were grouped into following tolerance bins: &lt; 70%, 70 to 80%, 80 to 90%, 90 to 130%, and &gt; 130%. The target value was adopted as quality criteria when the distribution of the data in the five bins met the specification criteria of 90% of the data exceeding 90% of the target value. These target values were established at the beginning of the project and were used by the contractor in production operations.</p><p></div><div></p><p>Project-scale correlations by averaging data from different areas on the project showed R² values ranging from 0.52 for density and 0.79 for DPI. Correlations with LWD showed poor agreement due to the effect of loose surficial material. The coefficient of variation observed in the CMV data was similar to DCP and LWD measurements but not to density measurements.</p><p></div><div>A geodatabase was developed with full project-scale data. Geostatistical analysis of spatially referenced roller CMV measurements was performed to better characterize uniformity of compacted fill materials.</div><h2>Performance Monitoring:</h2><div>Modulus (E_LWD) determined using Zorn LWD and penetration resistance determined using DCP along with roller-integrated CMV measurements were used for QC/QA on the project. Comparison results between roller-integrated CMV and density, E_LWD using Zorn and Keros, and DCP index measurements are presented in this paper.</div><h2>Case History Authors/Submitters:</h2><div></p><p>John Siekmeier, P.E.<br>Senior Research Engineer<br>Minnesota Department of Transportation<br>Email: <a href="mailto:John.Siekmeier@state.mn.us">John.Siekmeier@state.mn.us</a></p><p… J. White, Ph.D. Pavana KR. Vennapusa, Ph.D.<br>Iowa State University Iowa State University<br>Email: <a href="mailto:djwhite@iastate.edu">djwhite@iastate.edu</a&gt; Email: <a href="mailto:pavanv@iastate.edu">pavanv@iastate.edu</a><h2>Project Technical Papers:</h2>White, D., Thopmson, M., Vennapusa, P., and Siekmeier, J. (2008). “Implementing intelligent compaction specifications on Minnesota TH 64: Synopsis of measurement values, data management, and geostatistical analysis.” <em>Transportation Research Record, </em>2045, 1-9.</p><p>White, D.J, Thompson, M., Vennapusa, P. (2007a). <em>Field Validation of Intelligent Compaction Monitoring Technology for Unbound Materials</em>, Mn/DOT Report No. MN/RC 2007-10, Iowa State University, Ia.</p><p></div><div><h2>Date Case History Prepared:</h2>November 2012</p><p></div></p></p>