9.2.1 Batch and Pumping Systems

Virtually all grouting applications rely on pumps to place the grout and to provide the required pressures for various grouting methods.The grouting pressures may vary widely from a few thousand to tens of thousands of kPa.For cement grouts，the mixture of cement，water，and any other additives must be blended，continuously agitated，and pumped into the ground before the material sets.In these cases，the water is the catalyst and fluidizer，and must be part of the batch.Ideally，the pump system should have a volume capacity to batch all of the grout needed for a single injection process.