Compaction grouting is a method of soil stabilization where a low flow cementitious grout is injected into the soil to form a grout bulb. The grout does not permeate soil pores, but displaces the soil and compacts it in the process.
The compaction grouting process is typically carried out in vertical stages, progressing upwards from the deepest unstable zone. In shallow fills the upper zone may require grouting initially to densify the upper layer and also increase the overburden pressure.
This grouting application is most suitable in stabilizing areas of low density fills, since the maximum effect is realized in the least stable zone.
GeoGrout has applied compaction grouting techniques to stabilize low density fills on high maintenance roadways.