Field testing an acrylate grout

We do a lot of in-house testing of our products during and after development, as do most R&D operations, and we want to share some of those results from time to time.

One of our newest products, AR 800, is an acrylate chemical grout used for soil stabilization and sealing leaks. We recommend it for geotechnical applications in wet or very humid environments, and it is excellent in sandy to silty soils. The cured resin forms an elastomeric gel that can shrink or swell reversibly along with the moisture content of its environment.

One of its best features is the ability to vary the set time in the field through the concentration of additives SP (sodium persulfate) and TEA (triethanolamine). It’s great for permeation grouting in sandy soils because the resin stays liquid all the way until the moment of polymerization—rather than foaming or thickening before gelling—allowing for the grout to travel broadly and deeply through the soil.

What we tested: We recently did a field test pumping a high volume of resin under low pressure into standard, saturated sandy soil to test its permeation effects. We used 18 gallons of mixed resin at 50 percent concentration, injected in three lifts.

Results:  the AR 800 performed exactly as expected. The resin set in approximately 45 seconds—though that can be stretched to a few minutes if needed—and formed a solid mass.A large solid mass results from low pressure injection of acrylate chemical grout into sandy, wet soil.

When is this acrylate resin the right choice for permeation grouting and leak sealing versus a polyurethane foam?

  • It may be a more economical choice as a grout system given its concentration and large proportion of water in the mix.
  • It performs best in very fine, sandy soils due to remaining a very low viscosity liquid until the moment of polymerization.
  • In settings with very hot ground water—which will cause foam to collapse—such as deep tunneling and mining operations (proven during another of our field tests).
  • It can be used as a non-toxic alternative to acrylamide grouts.
  • It is NSF/ANSI Standard 61 compliant—verified through independent laboratory testing—for contact with drinking water, so it is good for situations where water will or may become part of a drinking water source or is part of another environmentally delicate scenario.
  • If you do not want expansive pressure when filling voids or stabilizing soils. This includes situations where there are existing underground structures that cannot or should not be subjected to expansive pressure—behind a retaining wall, where tanks are buried or where plastic pipes are located.

If you want more information about AR 800 or our other acrylate, AR 870, feel free to call your technical consultant or our main number at 800-321-7212.

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