'Compaction grouting' as a ground improvement technique involves:
Choose the correct answer
Injecting liquid to permeate soil pores
Injecting very stiff grout bulbs that densify loose surrounding soil by lateral displacement
Mixing cement into soil with auger
Freezing the soil
Correct Answer
B. Injecting very stiff grout bulbs that densify loose surrounding soil by lateral displacement
Why is this the answer?
Compaction grouting: very low-slump (0–25 mm) cement-sand grout injected under high pressure into loose soil through small-diameter pipes. Grout forms a bulb; does NOT penetrate soil pores (like permeation grouting). Instead, the expanding bulb densifies surrounding soil by displacement. Used for: loose sand, collapsible soils, utility corridor remediation. Controlled by monitoring injection pressure and volume.
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