Soil Stabilization of Oklahoma, Inc.

SSOK Logo  Soil Stabilization of Oklahoma, Inc.           Soil Stabilization Injection Logo 

               Your source for Green solutions for

                   foundation and roadbed stabilization, clay soil improvement for plant growth,

                         plant propagation, and land reclamation from toxic wastes

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Information for Builders

Every commercial builder knows that expansive soils beneath a building foundation, paved surfaces, or floor slab must be addressed. Normally this is accounted for by removal of expansive soil and replacement with a non-expansive fill. This is a proven method for solving the problem but it can be expensive, especially if done properly.

We have noticed that large number of home builders in Oklahoma do not provide a foundation system adequate for the home. This was pointed out in a short newsletter published by the Oklahoma Professional Engineering Society. Foundations have been found to be inadequate in a number of areas such as non-expansive fill placement, weak pier and grade beam systems, shallow piers, etc. Many builders seem to think that merely installing non-expansive fill such as sand, gravel, or sandy loam below the slab and to the depth of the grade beam will provide the stability they need. Since most foundations in Oklahoma have grade beams that are only 18-24" below grade to prevent frost heave, means that most, if not all, grade beams are too shallow to avoid seasonal wet to dry fluctuations in soil moisture. While unstable moisture has no impact on non-expansive fills, expansive clay soils in Oklahoma can only be guaranteed to swell or shrink during our wide swings in seasonal moisture. For a grade beam system to remain stable in Oklahoma, it would either have to be 15 feet deep or be supported on piers with belled-footings that penetrate to the same depth. Most homes and many light commercial structures do not use such deep grade beams or foundations. Think about how much the cost of a home or light commercial structure would rise if all of the native soil down to a depth of 15 feet was required!

This where Condor SS can solve several problems for the builder. Condor SS can easily be injected into the soil to a depth of 10+ feet and stabilize all of the clay within the injection zone. This give you a non-expansive platform to build upon that will remain not only as stable but more stable than imported fill. It can be more stable because Condor SS can actually significantly increase the strength of the clay soil.

   

It can also replace the sub-base material under roadways. Application of Condor SS can be made by scarifying the surface and spreading a mixture with standard water trucks prior to final compaction. In fact, if you are importing soil that contains significant clay, you can spread the mixture over the top of each lift prior to compaction. This method is by far the least expensive method for install Condor SS because it involves little or no additional equipment or labor. Of course the actual ratio of water to Condor SS will vary depending upon the characteristics of the clay soil.

How Much Change Will There Be In The Potential Vertical Rise?

The exact amount that Condor SS will reduce the swelling of clay soil depends upon the application rates and density of the clay. Here are some long time wet-dry one-dimensional lab swell test made on an Oklahoma soil sample over a number of months. Standard ASTM one-shot tests were not appropriate because it takes some time for the chemical exchange to take place. These drying cycles simulated the slow drying that would naturally occur. Graphs show that after treatment the cyclic wet-dry swell-shrink was reduced to a negligible level. The ultimate goal is to reduce the swelling to less than 1% so that special foundation and slab designs or imported select backfill will not be required. It should also be pointed out during the tests graphed below that with time further consolidation of the clay occurred. The additional consolidation results in a higher strength soil.

Untreated Chart  Treated SS Chart

      Untreated Soil Cyclic Swell          Cyclic Swell After Treatment with Condor SS 

Costly?

No! Condor SS injection can be accomplished at a current cost of less than $8 / cu-yd, water truck spreading for pennies/cu-ft, and there is:

  • No excavating
  • No hauling of imported fill
  • No soil to compact in layers
  • Increased stability due to increased depth of stable earth
  • Cost savings on large sites have been in the hundreds of thousands of dollars!

Proven?

  • In use in the United States and internationally in 20 countries for clay soil stabilization
  • Development tracts exceeding 100 acres in Texas have been treated and reduced the swell to well below that required by geotechnical engineers
  • Used by U.S. Forestry Service and Dept. of Defense
  • Used for buildings, unpaved roads, airports, runways, etc.

Other Benefits

  • Permanent change to the clay characteristics
  • EPA approved
  • Will not harm vegetation
  • Diluted mixture meets California drinking water standards
  • Can be used to treat local imported fill containing large amounts of clay without resorting to select fill hauling