Cellular Grouting

Better Methods, Better Results

Cellular grout is an ideal material for filling the annular space between the carrier pipe and tunnel, as well as for slipline projects. For decades, we’ve used lightweight cellular grout as backfill for lined tunnels on projects all over the country.

There are many advantages in using cellular grout instead of regular sand-cement grout. Major advantages of cellular grout include the considerably lower density, superior fluidity, and unique stress-deformation characteristics. The density of lightweight grout is one-third to one-half the weight of regular grout, thus the buoyancy effects of the conduits will be one-third to one-half as much. This greatly reduces the possibility of deflection and flotation of the conduit. With increased fluidity, the Cellular Grout readily flows into irregular voids, requires no consolidation, and improves the pumpability of the mix. Therefore, less pressure is needed to pump the mix, which reduces the risk of collapsing the ducts. The unique stress-deformation characteristics of the cured cellular grout allow it to adapt to movement of the confining media, without applying too much stress or distortion to the carrier pipe.

Midwest Mole is a trained and licensed contractor of cellular grout. We can install lightweight grout for geotechnical fills, abandoned structures, and annulus grouting for sliplining and carrier pipe installations.

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Cellular grout is just one way Midwest Mole can tackle a wide variety of tunnel and slipline projects. Contact us today to see if cellular grout is the right method to backfill your tunnels.