Innovative Methods for Soil Densification and Compaction

Foundation repair, Sewer Repair and Soil Densification

Loose, low density, collapsible, or weak soil beneath concrete slabs and structures can cause major damage. Heavy rains, pockets of groundwater, underground streams, deep ground voids and underground soil fissures are just a few contributing factors to weak soil.

With our CST technologies, soil stabilization and soil densification is a quick, economical, non-destructive and long lasting solution for re-compaction and densification of weak soil strata. The process increases and improves load bearing capacity below and around structures, densifies poorly compacted fill, and provides efficient support for aging and deficient public infrastructure. Ideal solutions for foundations, footings, heavy machinery bases, equipment pads, tank pads, and more to solve settlement problems or weak soils.

CST Soil Densification and Compaction

CST polymers are unique, in that once injected, the polymer initially moves throughout the voids between the soil grains and then binds and densifies the soil into a single monolithic unit.  The monolith is light-weight and has high weight-bearing capacity.

The CST polymer injection soil densification process results in aggressive voidfill and soil stabilization within the treated area.

excavated material
This image displays material that has been excavated. The material held together as a single monolith, binding the soils together

Utilizing the CST deep injection process, a subsurface cutoff wall can be installed without excavation to the target location. The wall is formed of a high-density structural polyurethane and is injected at multiple depths in a horizontal and vertical pattern.  The soil densification result is a curtain wall that restricts groundwater movement.

This application can be used in:

  • Restricting Groundwater Migration
  • Construction Site Dewatering
  • Sealing Building or Subsurface Structures against Groundwater Infiltration
  • Inflow and Infiltration Mitigation

DI picture

swelling-soilTo mitigate expansive soils CST uses  AGSS-ICS, a state of the art Ionic Clay Soil Stabilizer that has been developed to treat swelling clays. The product works two ways. It reduces the swell potential of the clay soil and, because it dramatically reduces the capillary action of the clay particles, minimizes the shrinkage potential. When treated with the AGSS-ICS chemical, an irreversible change occurs in the molecular structure of the clay particles, and they no longer attract or hold on to water as they did before treatment. Treatment of pre-construction sites as well as existing structures is available. For preconstruction sites, the chemical is mixed or injected into native soils. For remedial/post construction problems, the chemical is injected into the soil, beneath and around the existing structure through small injection probes. The process alleviates swell and can sometimes even relax existing heaving.

  • Swell potential reductions are permanent
  • No Excavation required for existing structures
  • Allows for use of onsite soils
  • Reduces emissions and fuel usage by reducing trucking of large quantities of waste and fill soil
  • Will not produce sulfate heave caused by lime injection
  • Environmentally safe
  • Proven, verified results

Slope stabilization can be achieved by implementing polymer injection process soil densification.  The polymer can be injected in a horizontal and vertical gridded pattern to reduce the lateral movement of the support soils.    In addition the product is a great application for retaining wall stabilization. The polymers can be used to stabilize Mechanically Stabilized Earthen (MSE) Walls from being compromised by water movement or voids that form behind the the MSE wall.

Additional applications include lateral lifting of structures using the CST deep injection process that will be used to stabilize the weak soils to prevent horizontal movement, and then strategically injecting the product to move the support soils laterally.