<p><p><strong>References:<br></strong><em>Byrne et al. (1998)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Rogbeck et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>Soil nail walls utilizing shotcrete need to complete shotcrete inspection. For permanent walls, shotcrete core testing should be performed. Byrne et al. (1998) Appendix C 2.2.3 describes how to extract core samples from shotcrete walls to be tested for compressive strength. Cores from non-reinforced shotcrete test panels are tested for compressive strength while cores from reinforced test panels are inspected for air pockets and quality in comparison with photographs. According to Byrne et al (1998), three cores are tested at 3 days and three cores are tested at 28 days, per AASHTO T24/ACI C 42.</p><p><strong>Accuracy and Precision</strong></p><p>Confirming the quality of the materials for use in the project is a straightforward and accurate process.</p><p><strong>Adequacy of Coverage</strong></p><p>Representative inspections are typically performed for materials arriving in mass quantities.</p><p><strong>Implementation Requirements </strong></p><p>Confirming the quality of project materials is a straight forward process requiring minimal training or experience.</p><p><strong>General Comments</strong></p><p>Material testing ensures that the spray-on concrete has the necessary properties to support the soil nail wall. Once materials (nails, shotcrete, etc.) are in place, they can be difficult and costly to remove and replace. As a final pre-installation check, it should be confirmed that the material delivered to the site fulfills the design requirements. If shotcrete is mixed on the site, tests should be conducted to ensure the material meets the specifications. Shotcrete inspection and testing can be used for both method and performance approach specifications.</p></p>