Large Void Filling Using An Expansive Foam
The injection of a single component expansive foam chemical grout into a void space within various types of strata, to fill the void and stop infiltration and to stabilize the remaining soil type.
The expansive foam is pressure injected from a remote pumping system. The liquid foam (with appropriate amount of catalyst) is pressurized directly into the void space, when the chemical grout comes into contact with groundwater or moisture from the soil, the chemical grout expands and fills the space to complete the reaction. The chemicals predictably react in minutes, but the reaction times can be increased by adding additional catalysts to the resin.
These types of chemical grouts are generally pressure injected at higher pressures with lower volumes of material.