<p><p><strong>References:<br></strong><em>Bruce (1997b)<br>Bruce and Juran (1997)<br>Cadden et al. (2004)<br>Gomez et al. (2008a, 2008b)<br>Sabatini et al. (2005)</em></p><p><strong>Method Summary</strong></p><p>A specific gravity test is performed as part of grout inspection and is used to confirm the water content (i.e. water-cement ratio) of the grout. Confirming the water-cement ratio of grout is an important quality control measure because water content is the prime determinant of grout properties and strength. Specific gravity is determined with a calibrated mud balance following the American Petroleum Institute (API) Recommended Practice (RP) 13b-1 “Recommended Practice Standard Procedure for Field Testing Water-Based Drilling Fluids”.</p><p><strong>Accuracy and Precision</strong></p><p>Confirming the specific gravity of grout for use in the project is a straightforward and highly precise process.</p><p><strong>Adequacy of Coverage</strong></p><p>The specific gravity should be measured at least once per micropile or batch.</p><p><strong>Implementation Requirements </strong></p><p>Measuring specific gravity of the grout is quick and inexpensive.</p><p><strong>General Comments</strong></p><p>Measuring the specific gravity prior to and during grouting verifies that the grout is being prepared as the design specifies. Specific gravity testing is timely, simple, and provides real-time results. In addition, specific gravity testing is a more reliable indicator of grout consistency and quality because the test is more sensitive to water-cement ratio. For these reasons, specific gravity is preferred to cube testing.</p></p>