c. To Enhance Soil Properties when Mixed with the In-place Material 

  Stabilized road bases can be produced by mixing fly ash and a calcium rich material with aggregates.  The calcium rich material can be Portland cement, lime or kiln dust.  Class C fly ash frequently has sufficient calcium to serve both functions.  Then it need only be mixed with the aggregates and water followed by compaction to achieve optimum density to generate the required in-place strength.
  A typical mixture will contain 8 to 14 % fly ash and 3 to 8% lime by weight.  Type I Portland cement can be used to accelerate early strength gain.  The aggregates should have a gradation such that a dense easily compacted mixture results that has low permeability and adequate strength.  The mixture can be mixed in-place using part or all of the original material.

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