<p><p><strong>References:<br></strong><em>Adams, et al. (2011)<br>Berg, et al. (2009)<br>Morrison, et al. (2006b)<br>Tanyu, et al. (2008)</em></p><p><strong>Method Summary</strong></p><p>Establishing control measures for the reinforced material fill is imperative for construction of MSE structures. The backfill in MSE structures is the key element in satisfactory performance. The use of appropriate material and its correct placement are important properties. Reinforced backfill is normally specified to meet certain gradation, plasticity, soundness, and electrochemical requirements.</p><p><strong>Accuracy and Precision</strong></p><p>The accuracy and precision through which the reinforced backfill material is analyzed is dependent on the type of contract established and the proper monitoring of material performed by the owner, engineers, and contractor.</p><p><strong>Adequacy of Coverage</strong></p><p>Depending on the type of contract, tests to ensure compliance may be performed by either the contractor or the owner. The tests conducted prior to construction and periodically during construction for quality assurance form the basis for approval.</p><p><strong> </strong><strong>Implementation Requirements</strong></p><p>During construction these tests include gradation and plasticity index testing at the rate of one test per 1,500 m³ (2,000 yd3) of material placed and whenever the appearance and behavior of the backfill changes noticeably.</p><p><strong>General Comments </strong></p><p>Placement and compaction of reinforced material is just as important as material choice itself. Therefore, it is really important to monitor all aspects of fill from backfill selection to placement in field.</p></p>