Plural component polyurethanes can be used for soil grouting similarly to cement based grouts. Features and conditions which can be addressed with polyurethane compaction grouting include:
- Karst feature & sinkhole sealing/filling
- Loose or uncontrolled fill densification
- Groundwater cutoff
- Binding granular materials
There are a few key differences between compaction grouting with cement grouts and compaction grouting with geotechnical polyurethanes.
- Unlike low mobility cement grouts, where slump doesn’t change during placement, polyurethane grouts are highly mobile initially, then lose that mobility within seconds to minutes.
- Polyurethane grouts used for compaction grouting generally have short gel times, so stop moving laterally before they stop expanding.