Compaction Grouting uses controlled displacement to increase the density of soft or loose soils. It is typically used for settlement control, structural re-leveling, and remediation of sinkholes. A small diameter (2" - 4") steel casing is advanced through the zone to be improved, and a stiff mortar-like grout is injected at high pressure to displace and compact and the surrounding soils. Pumping is continued as the grout casing is withdrawn, forming a larger diameter (12" - 18") column of interconnected grout bulbs. As they form, they intensely compact the soil around them. Compaction piles can be formed in the same manner to create a continuous structural support for foundations.
