ZeloGrout GPNS is a non-shrink cementitious grouting solution that has been carefully developed to generate an excellent-performing. pourable grout with high strength and slightly expanding qualities. It is a combination of portland cement, gradated fillers, and chemical additives that entirely fills the void between base plates and foundations in a single application of grout for gap widths ranging from 10 to 50 mm. and cause controlled expansion in the plastic, which states that while reducing water consumption.