Prime Resins manufactures polyurethane resins for both permeation and compaction grouting operations. Permeation grouting saturates the soil with an extremely low viscosity resin (Prime Flex 910 injected neat or Hydro Gel SX mixed with water). Compaction grouting results from injecting a two component, rapid set, highly expansive structural foam (Prime Flex 985 series) which fills voids and compacts soil by its expansive pressure. This is a similar procedure we use to raise concrete slabs on highways, bridge approaches, and industrial floors via our Precision Lift™ process.
http://www.youtube.com/watch?v=kG1ZxZmaurY&hl=en
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