High Solids Bentonite Grouts In Geothermal Applications
The bentonite, sand, and water are typically mixed in a paddle-type mixer and pumped through a tremie pipe into the annular space of the borehole. The annulus should be filled from bottom to top, displacing any water in the borehole. A positive displacement pump is often recommended, and the tremie pipe should be 1" to 1-1/4" I.D.
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