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Soil Stabilization

Green Mountain Strong

Soil Stabilization is a general term that relates to a method of changing an existing soil condition to meet an engineering purpose. It can be accomplished with various applications and materials, but in some cases, chemical grout injections are the clear choice to achieve optimal results. The most common Mountain Grout Materials used for soil stabilization are Mountain Grout Soil Stabilizer, an ultra-low viscosity polyurethane, HL-100, a slightly higher viscosity polyurethane resin, and Mountain Grout Acrylate, an ultra-low viscosity polymer with a reaction time ranging from a few seconds to over an hour.

Mountain Grout Polyurethanes satisfy several criteria common on job sites. They are chemically and biologically inert, unaffected by filtration, environmentally safe, and capable of forming an effective seepage barrier within most soils. Polyurethane grouts are able to expand beyond their liquid volume in order to provide confidence in the formation of a complete cut-off. Additionally, Mountain Grout Soil Stabilizer and HL-100 are both hydrophobic grouts, meaning they do not require contact with water to maintain their shape and volume. This trait mitigates the potential for void formation due to shrinkage of the grout from water loss.

Mountain Grout Acrylate

Mountain Grout Acrylate, a polymer resin almost as thin as water, utilizes environmentally safe acrylic resins in conjunction with catalysts and accelerators. The system is typically pumped at a ratio of 1:1 when controlling active water leaks and at higher ratios with water when ultra-low viscosity is needed to penetrate fine soil particles. At a 1:1 ratio, the resulting product is a flexible elastomer. At a higher ratio of water to resin, a pliable gel results.

In circumstances where installers want to stabilize soils at a depth up to approximately ten to twelve feet, installers may drive injection pipes to their desired depth and pump the product at a rate of up to one gallon per foot. This method is common under failing footers, large diameter pipes, and along zero lot lines. It is also used in mining applications ahead of drill rigs to consolidate the soil to facilitate drilling.

In other circumstances, installers may drillholes using air or water flush, setting the steel pipe for grout injection, injecting the grout in one-foot intervals, and extracting the casing with jacks as the grouting progresses.This was the application utilized at Eagle Mountain Dam and Levee, where over 57,000 gallons of HL-100 were pumped in specific grout zones, some as deep as 100 feet, in order to mitigate water loss under the dam.

Common applications for soil stabilization are earthen dams, tunnels, mines, and excavation sites and the best results occur in sandy soils.

Product Links

  • Mountain Grout Soil Stabilizer
  • TDSMountain Grout HL-100
  • TDSMountain Grout Acrylate TDS


  • Mountain Grout Resin of Choice
  • Mountain Grout Pump Flush
  • Injection Pump
  • Injection Pipes
  • Clean 5-gallon buckets
  • Personal Protective Equipment (PPE)
  • Rags or Mountain Grout UreClean Wipes

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Green Mountain Grout International LLC, Member of the ICRI & Member of the ASDSO.