<p><p><strong>Reference(s):</strong></p><p><em>Baker (1983)<br>Brachman et al. (2003)<br>Bruce (1994)<br>Dreese et al. (2003)<br>Karol (2003)<br>Lees and Chuaqui (2003)<br>Müller et al. (2000)<br>Munfakah (1991)<br>Waller et al. (1983)</em></p><p><strong>Method Summary</strong></p><p>This method of quality control is integral to all grouting projects and includes monitoring of flow rate, gage pressure, effective pressure, Lugeon value, and mix properties with time. The monitoring technology ranges from point measurements to continuous computer based measurements with real-time feedback including interpreted spatial data. This type of information allows the grouting technician to make rapid changes to adjust for variations in grouting conditions. Automated control response is available to make a closed loop system. The use of monitoring is critical to success and the use of new technologies has proven to be effective in increasing the final performance of the product and efficiency of the process.</p><p><strong>Accuracy and Precision</strong></p><p>The accuracy and precision of the pumping/injection monitoring systems is not documented in the literature. It depends on the type of equipment used for monitoring. Computer based measurements with digital systems can be considered accurate and precise.</p><p><strong>Adequacy of Coverage</strong></p><p>If real-time process monitoring is used it records the entire grouting process. However, it does not provide any measure of the spatial extent of grout penetration.</p><p><strong>Implementation Requirements</strong></p><p>Monitoring grout pumping or injection is a very common process and is easy to implement. However, use of advanced computer based technologies with real time feedback may require some training and initial investment costs.</p><p><strong>General Comments</strong></p><p>The use of monitoring is applicable to all chemical grouting techniques and should be required on all projects.</p></p>