Cellular grout is an engineered portland cement slurry combined with precise amounts of density controlled foam. The portland cement slurry and foam are mixed producing a lightweight mixture containing uniformly distributed air cells. In it’s rigid form it can be thought of as cement based grout having air as the aggregate. Density can be varied from 20-120 lb./ft3. Compressive strength ranges from 20 to 3,500 psi. are available. Cellular grouting is becoming more and more commonly used and accepted within the engineering and construction community as a technology for filling voids. Some relevant applications include but are not limited to: pipe abandonment, voided slab fill, decommissioning and abandonment of underground tanks and structures, mine stabilization and abandonment, and annular space grouting.