<p><p><strong>Reference(s):</strong></p><p><em>Dreese et al. (2003)<br>Karol (2003)<br>Lees and Chuaqui (2003)<br>Krizek et al. (1983)<br>Müller et al. (2000)</em></p><p><strong>Method Summary</strong></p><p>Regular sampling and testing for grout gel time, set time, specific gravity and viscosity improves consistency of the grout. This is primarily for QC which ensures that grout properties have not changed during the construction process. ASTM D4219 describes a laboratory test method to determine unconfined compressive strength index of chemical grouted soil specimens prepared in laboratory. ASTM D4320 describes a laboratory test method for preparation and testing of chemically grouted soil specimens to obtain design strength parameters.</p><p><strong>Accuracy and Precision</strong></p><p>Accuracy and precision of the results depends on the test method used. Precision and bias statements were not provided in the ASTM standards (ASTM D4219 and D4320).</p><p><strong>Adequacy of Coverage</strong></p><p>Testing is not continuous so coverage is not 100%.</p><p><strong>Implementation Requirements</strong></p><p>Standards for testing exist and implementation is relatively low cost.</p><p><strong>General Comments</strong></p><p>The use of grout sampling and testing is applicable to all application techniques and should be required on all projects.</p></p>