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Soil Stabilization Presentation

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Presented By:

Muhammad Bilal
L1F21MSCE0004
DEFINITION:
 Chemical or mechanical treatment designed to
increase the stability of a soil mass and improve its
engineering properties.
 Modification of soil structure and the reduction of the
moisture content of cohesive soils lead to a
considerable improvement in bearing capacity.
Modification of soil structure is the concept of soil
stabilization.
 strength  improvement
 Dust control
 Soil waterproofing
 Slope Failures
 Bridge Failures
 Structural failures
 These above failures can be eliminated by stabilizing
the soil.
 Shear strength
 Density
 Permeability.
 Surface Area.
 Atmospheric Conditions.
Compaction
Altering size distribution
 Drying
Compaction has following effects on the soil:
 Increases density
 Increases strength
 Reduces permeability
 Performance of soil can be greatly improved by drying
in sun or oven
Combination of chemical & physical reactions.
Materials known as stabilisers:
 Lime
 Cement
 Bitumin
Lime +
clay

Flocculation - fine
particles stick Lime + silica
together -size +
distribution alumina
changes

cemen
t
gels

Physical
chemical
reaction
reaction
LIME STABILIZATION PROCEDURE.
Pulverization and scarification
Lime content
Uniformity of mixing
Compaction
curing
Low volume road construction -base coarse &
wearing coarse.
Sub grade improvement for low & high volume
roads.
CEMENT STABILIZATION PROCEDURE
Pulverization
Cement content
Moisture content
Uniformity of mixing
Compaction
Curing.
• Cement stabilised soils usually stronger than lime
stabilised soils.
• Similar uses to lime stabilised soils.
The factors that seem most important to control are
 Surface moisture content
 Viscosity of the asphalt
 Asphalt content
 Uniformity of mixing
 Aeration
 Compaction and curing.
GROUTING METHODS:
 Grouting pressures shall be sufficiently in excess of
confining overburden pressures to adequately
compact the soil and fill all voids in the soil beneath
the indicated areas. In no cases, however, shall the
pressures be high enough to cause structural damage
to the building.
 Where drilling indicates the presence of small voids,
grouting shall begin at ledge rock elevation and
continue upward in 12 inch maximum increments.
USES:Soil stabilization by compaction grouting is to
improve supporting characteristics of the silty clay
sub soils, and prevent any further settlement from
occurring within the area indicated on the Contract
Drawings.
 Preserve Vegetation
 Mulching
 Hydraulic Mulch
 Hydroseeding
 Soil Binders
 Straw Mulch
 Rolled Erosion Control Products
 Wood Mulch
 Improves the strength and durability
 Stabilisation of sub-grade to increase CBR
 Reductions in bulk dig quantities
 This technique is a cost effective alternative to
importing aggregates for both temporary and
permanent works.
THANK YOU

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