GeoGrout’s pressure grouting procedures and site specific mixes have been utilized for void filling applications, such as: abandoned underground pipes, concrete slab construction joints, structural steel pipe columns and heavy equipment base frames.
Abandoned Underground Pipes
Pressure grouting of abandoned underground pipes is carried out by initially installing grout plugs along with the required injection and vent ports at each end of the pipe. Pressure grouting is performed from the low end injection pipe. This method ensures total displacement of fluids within the pipe enclosure through the high end pipe vent. For this application, Geo Grout produces a grout mix with the following minimum properties:
- Grout has flow properties that permit total displacement of fluid from the pipe enclosure
- Grout will maintain its material integrity during injection and not mix with fluid present in the pipe enclosure
Pressure grouting annular spaces of slip liners poses additional challenges, due to the minimal available void space between the liner and host pipe. GeoGrout has produced grout mixes to fill annular spaces of less than 20mm, over spans of 100m. Grout pressures to place these mixes are maintained within pipe manufacturers tolerance.