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Stabilization of Peat Soil using Lime

• Peat soil
• low shear strength
• High organic matter
• Low bearing capacity
• High compressibility

• Typical Chemical Soil Stabilizers
• Quicklime CaO, a caustic and alkaline
• substance formed during calcination of
• limestone in lime kiln.
• Hydrated Lime CaOH2 formed by
• exothermic reaction between CaO H2O.
• Lime Slurry A suspension of quicklime
• or hydrated lime in water.

• Disadvantage
• no drastic alterations in properties
• suitable only for plastic clay

• Advantage
• chemically transform clay soils
• permenantly increases strength
• eliminates soil expansion
• creates excellent free-thaw resistance
• resists cracking
• reduces thickness of overlying pavement layers,
• saving money, time
• permits reworking
• maximize use of low cost, on site materials

• Chemical Soil Stabilization Process
• Initial Soil Drying
• CaO H2O Ca(OH)2 Heat (Hydration, occurs
  instantly).
• Modification
• Flocculation and agglomeration process where
  calcium ions of hydrated lime replace sodium and
  hydrogen ions from surface of clay particles,
  resulting in a soil with friable and granular
  characterisics and reduced plasticity index.
  (Occurs within hours).
• Stabilization
• Breaking down clay particles, releasing silica
  and alumina, which react with calcium from lime
  into CSH and CAH cementious matrix. (Occurs
  within hours and can continue for years).

Soil Stabilization All soil modification
benefits, and permanently increase compressive
strength, increase load-deformation properties,
and improve durability during freeze-thaw and
wet-dry cycles, to be incorporated into
structural design.