<p><p><strong>References:<br></strong><em>Avalle (2004b)<br>Pinrad (1999, 2001)<br>Scott and Suto (2007)</em></p><p><strong>Method Summary</strong></p><p>IR can be used as a “proof compactor” or “proof roller” to visually identify soft spots that need additional compaction or rework. Avalle (2004b), Pinrad (1999, 2001), and Scot and Suto (2007) documented field observations effectively using the IR as a “proof roller”. The process typically involves visually monitoring surface depressions or ruts under the IR.</p><p><strong>Accuracy and Precision</strong></p><p>The accuracy and precision of this test method cannot be quantified.</p><p><strong>Adequacy of Coverage</strong></p><p>The coverage area depends on the number of inspectors on site.</p><p><strong>Implementation Requirements </strong></p><p>It is easy to implement but need field inspectors on-site to continuously monitor the operations.</p><p><strong> </strong><strong>General Comments </strong></p><p>The concept of “proof rolling” using heavy rollers has been widely used on earthwork construction projects for QA. Using IR as a “proof roller” also has similar potential in evaluating the quality of compacted fill materials. Visual observation only provides a qualitative measure. Quantitative measurement of surface depressions is discussed in the <em>Elevation Monitoring </em>individual QC/QA method.</p></p>