<p><p><strong>Reference(s):</strong></p><p><em>DeJong et al. (2010)</em></p><p><strong>Method Summary</strong></p><p>The compression wave corresponds to compression and dilation of material parallel to the direction of propagation. Compression waves can propagate through solids and fluids effectively, and is affected by bulk modulus, degree of saturation, and porosity. The properties of the particle matrix (e.g., density and stress level) will also influence the compression wave velocity, V_p.</p><p><strong> </strong></p><p><p style="text-align: center;"><strong>V_p = ((B + 4/3G)/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><p style="text-align: center;"><em> B </em>= bulk modulus</p><strong>Accuracy and Precision</strong></p><p>This method has medium accuracy and precision and could test the strength variation of specimens accurately.</p><p><strong>Adequacy of Coverage</strong></p><p>This method has medium adequacy of coverage and is focused on strength; other properties need to be monitored.</p><p><strong>Implementation Requirements </strong></p><p>This method has medium implementation requirements.</p><p><strong>General Comments</strong></p><p>The compression wave velocity test is important for quality control and quality assurance. The obvious variation in bio-treated subgrades is strength and permeability. So this method could be used to monitor these properties of soil.<em> </em></p></p>