Geofill cellular (foam) concrete has been used successfully to solve a variety of tunnel backfill grouting challenges.

Geofill's unique set of characteristics makes it an ideal choice for either wet or dry tunnels, as well as critical path projects or jobs where access to injection points is limited.

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Geofill LD and Geofill LD Hybrid offer several advantages for tunnel backfill grouting applications, including:

  • Mix designs can be customized to project requirements including density, strength, and access issues.
  • Lightweight nature of the material will reduce the possibility of pipe floatation or buckling in comparison to heavier conventional grouts and concretes.
  • Flowable and pumpable, Geofill LD ensures complete filling of the tunnel at low pumping pressures that are easily maintained.
  • Low density cellular concrete backfill is energy absorbent and will protect finished tunnels from ground movement.

Geofill LD cellular concrete can be batched and pumped at rates of over 200 cubic yards per hour at distances of more than two miles. Material density is monitored at the plant and inside the tunnel at the point of injection.