<p><p><strong>Reference(s):</strong></p><p><em>DeJong et al. (2006)<br>DeJong et al. (2010)</em></p><p><strong>Method Summary</strong></p><p>Shear wave velocity can be readily measured with bender elements in the laboratory. In a specific study, a 20 V sine wave was applied at 10 kHz frequency to a parallel transmitting element and the received signal was detected by a series bender element. The peak-to-peak interpretation method was used to determine the shear wave velocity.<br><p style="text-align: center;"><strong><em>V</em>s = (<em>G</em>/ρ)^1/2</strong></p><p style="text-align: center;">where,</p><p style="text-align: center;"><em> G </em>= shear modulus</p><p style="text-align: center;">ρ = density</p>Results from DeJong et al. (2010) are shown below.</p><p><strong>Accuracy and Precision</strong></p><p>This method has high accuracy and precision and can test the strength variation of specimens accurately.</p><p><strong> </strong><strong>Adequacy of Coverage</strong></p><p>This test accurately measures the shear wave velocity of a treated sample in the lab but may not be representative of the entire treated area. This method is focused on strength; other soil properties need to be monitored.</p><p><strong>Implementation Requirements </strong></p><p>The equipment required method is industry-standard equipment. As such, it requires a working knowledge of the equipment and testing procedures.</p><p><strong>General Comments</strong></p><p>The shear wave velocity test is necessary for quality control and quality assurance. The obvious variation in bio-treated subgrades is strength and permeability.</p></p>