Hydrophobic Polyurethane Grout
Hydrophobic polyurethane is usually used to fill voids and stabilize soil because of its low viscosity, high expansion rate, and ability to set up under wet conditions without diluting.
When injected into loose soil or voids, it expands to form a rigid foam that displaces any water present. The material expands up to 1000% in soil and forms a strong, impermeable mass by binding the soil particles together. Because rigid hydrophobic material is not affected by fluctuation in the moisture content of the soil, it is virtually unaffected by water table level. It retains its strength, size and impermeability under almost all soil conditions. This makes it a popular choice for curtain grouting manholes and seawalls.