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Ash Grove Resources, L.L.C. supplies Ash Grove Durabase® CKD; to the construction industry. In this section, we will explain how this product is utilized in soil stabilization applications.

Application 1 - Drying Out Wet Soils

Ash Grove Durabase® CKD; is effective in reducing the moisture content of soils to levels suitable to achieve proper compaction. It can reduce the moisture content of soils by up to thirty percent (30%) and sometimes even more. Ash Grove Durabase® CKD; can accomplish this in just a few hours. Besides the speed in which this material dries out the soils, there is an additional benefit. Once mixed with the soil and compacted, the mixed product is more resistant to moisture penetration or disturbances during the duration of the project's construction phase.

Using Ash Grove Durabase® CKD; to dry out wet soils can be a more economical and time efficient solution to a wet soil. Buildings, structures, highways, bridges - anything that is constructed - must be placed on a stable, dependable soil base. In order to achieve an acceptable base, soils must be compacted to the specified densities. For this to occur, the moisture content of the soils must be within a specific range. If a soil has too much moisture, it cannot be compacted to the specified density. Consequently, there are two choices. One, all of the soil can be replaced with other materials or two, the soil must be dried out. Drying out can be accomplished by either aerating the soil or by adding a drying agent to the soil.

When the drying agent method is used, the construction industry gains several advantages. By using Ash Grove Durabase® CKD; as the drying agent the process becomes more time efficient and it can be less expensive than soil replacement or other methods. While the primary goal of using the drying agent is to reduce the moisture content to facilitate final compaction of the soil, a degree of stabilization also occurs validating the process.

Application 2 - Soil and Aggregate Stabilization

Stabilization applications usually address one or more of the following engineering properties:

  1. Shear strength
  2. Compressibility
  3. Permeability
  4. Swell Potential

There are two categories of soil stabilization. One is mechanical stabilization. This is achieved by compacting the soil to develop the desired engineering properties. The other is a chemical stabilization which involves the addition of a substance that reacts with the soil to achieve the desired stabilization or improvement. For this chemical reaction to occur, it requires a cementitious product that alters the soil to achieve the desired changes in engineering properties. Ash Grove Durabase® CKD; produces cementitious compounds that bind the soil particles and thereby achieve the desired stabilization. Ash Grove Durabase® CKD has certain amounts of free lime (CaO) available to react with clay minerals to further stabilize or alter the soil properties.

Ash GroveDurabase® CKD; presents some good news for the construction industry treatment of expansive clay soils. There have been two commonly used solutions for the industry when faced with expansive clay soils. The soils can be replaced with materials having a low shrink-swell potential or the soil can be treated with lime. Lime stabilizes expansive soils by means of a chemical alteration of the clay minerals in the soil as evidenced by the reduction in Atterberg limits. Ash Grove Durabase® CKD; is also effective in stabilizing expansive clays. However, since only limited amounts of free lime are available, the stabilization is achieved by physically binding the soil particles thereby restricting the expansion and contraction of such soils to acceptable limits. This product can be used to reduce the shrink/swell potential in expansive clay soils.

There are a number of additional benefits to mixing Ash Grove Durabase® CKD; in expansive clay soils. One is that the soil's strength is actually increased providing a more stable work base for construction. Another is the reduced sensitivity to additional moisture.

Ash Grove Durabase® CKD; gives the construction industry alternative solutions to a wide range of issues that occur on construction projects. No longer must these clay soils be replaced with nonexpansive materials. No longer is lime treatment the only chemical stabilization alternative to working with a clay soil. Using Ash Grove Durabase® CKD; to stabilize this type of soil is generally a more economical and time efficient construction procedure.

Stabilization of pavement subgrade with Ash Grove Durabase® CKD; can provide a significant increase in strength within the stabilized section. The stabilization can increase CBR (California Bearing Ratio) values from 3 to 5 for the untreated soils to values of 20 to 30 for the stabilized section. The stabilized section becomes a subbase for the concrete or asphalt pavement section and allows for a reduction in thickness of the more expensive components of the pavement. Strict control of mixing and compaction procedures is required to achieve full potential strength within the stabilized section. Moisture content of the Ash Grove Durabase® CKD; soil mixture at time of compaction greatly influences the strengths achieved and must be within the optimum range that is established through laboratory tests.