Subgrade consists of either natural or imported soil to form an embankment
. Stabilization is used when the soil used as a subgrade and improved using traditional
methods with cannot support a certain loading or has weak physical properties.
Soil Stabilisation
Soil stablisation is the permanent physical and chemical
alteration of soils to enhance their physical properties . It can increase the
shear strength of soil and control the shrink-swell properties of soil, thus
improving the load-earing capacity of a subgrade to support pavements and
foundations.
Chemical stabilization have 5 types :
1. Cement
2. Lime
3. Fly Ash
4. Bitumen
5. Ionic
Stabilisation with cement
Cement can be used either to modify and improve the quality of
soil or to transform it into a cemented mass with increased strength and
durability. The amount of cement used depends on whether the soil is to be
modified or stabilized.
Stabilisation with lime
In general, all time treated grained soils exhibit decreased
plasticity, improved workability and reduced volume characteristics.
Stabilization with Fly Ash ( Abu Arang Batu)
Fly Ash is a by-product of the pulverized coal comdustion process
usually associated with electric power generation plants. It is pozzolanic na nature and can react with
hydrated lime to produce cementitious products. For that reason, lime-dly ash
mixtures can be to stabilize subgradeand subbase.
Stabilization with bitumen
The mechanism involvedin the stabilization of soil with a
bituminous material (usually hot bitumtn, cutback bitumen or anionic bitumen
amulsion)
Stabilization with Ionic
This is a method to stabilize soils using migration induced by
applied electric fields. It can be increase soil shear strength an d reduce
water content.
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