The process is basically a permeation grouting technique. By filling the pores of a granular soil, with a resin (whether polyurethane or acrylate), we are able to bind the soils together, to form a stabilised mass of soil, with vastly improved bearing capacity; resulting in the soils becoming self-supporting. With the resins being hydrophobic or hydrophilic, we are also able to dramatically reduce water movement through the treated soils.
HOW IT’S USED
The resins are injected through bespoke injection lances at horizontal and vertical centres to suit the soil conditions. Angles and depths of lance installation and volumes of resin are pre-determined by H2Ox Engineers. The resins are then injected to form overlapping bulbs of stabilised soils. This is particularly useful in forming cut off walls in the ground, or stabilising soils in advance of underpinning; to act as support to adjoining land and provide stable working environments for excavations.
Ground that requires stabilisation does not need to be dewatered in advance or during the injection works.
The kit is small and highly mobile, allowing access in very tight locations; through doorways etc.
The resin is injected in low viscosity liquid form, allowing it to penetrate into pores inaccessible to conventional cementitious grouts.
The resins used are either hydrophilic acrylates or hydrophobic polyurethanes. Acrylates are used in very fine silty soils, whereas polyurethanes are used in most granular soils, with larger particle sizes.
The resin reaction times can be fully adjusted by varying the volumes of catalyst and initiators. This is particularly useful in soils where water movement is evident and we are trying to seal leaks through soils.
Low pressure injection prevents the possibility of hydro-fracture of soils and damage to adjoining structures. Pump pressure is always set to zero and gradually increased just enough to move the resin through the soils. There is no need to increase pressure beyond this point.
The foaming action of the polyurethane resin significantly reduces the volume and weight of injected product. A foaming factor of 4 times the injected volume is generally used in calculations. In 40% voided soils, this equates to 100litres of resin injected per m3. The equivalent in cementitious grout would be approximately 400 litres.
The environmental impact of the resin is minimal. Once cured, the resin becomes inert and can be easily excavated for further developments.
Minimal impact on groundwater. the resin displaces it locally rather than drawing it out of the ground.
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