5 ME T HOD S OF S OI L S T A B I L I Z A T I ON Following are the 5 Methods of Soil Stabilization: Mechanical, Chemical, Cement, lime
Mechanical Soil Stabilization. ⇰ In this method, the stability of the soil is increased by blending the available soil with imported soil or aggregates so as to obtain a desired particle size distribution and by compaction of the mixture to achieve the desired density.
⇰ This method is generally adopted for the construction of sub-base and base courses. It is also useful for the construction of a surface course of lowcost roads such as village roads when the traffic and rainfall are low.
Soil-Cement Stabilization ⇰ Soil cement is an intimate mixture of soil, cement, and water that is well compacted to form a strong base course. The addition of cement in small proportion to soil improves its strength and modifies the properties of soil.
⇰ Soil-cement stabilization can be used as a subbase or base-course for all types of pavements. But this method can not be used as a surface course due to its poor resistance to abrasion and impact.
Soil-lime Stabilization ⇰ Soil-lime is widely used either as a modifier for clayey soil or as a binder. When clayey soil with high plasticity is treated with lime, the plasticity index is decreased and the soil becomes brittle and easy to be pulverized having less attraction with water. Lime also imparts some binding action.
⇰ Soil lime is quite suitable as a sub-base course for the high type of pavements with low traffic. But this method can not be used as a surface course due to its poor resistance to abrasion and impact. This method is quite suitable in warm regions, but not very suitable under freezing temperature.
Soil-Bitumen Stabilization ⇰ The basic principles in bituminous stabilization are waterproofing and binding. Generally, both the binding and waterproofing actions are provided to the soil by adding bituminous material. The most commonly used bituminous materials are cutback and emulsion.
⇰ Bituminous stabilized layer can be used as a subbase or base course of ordinary roads and even as a surface course for roads with low traffic in low rainfall regions.
Chemical Stabilization
⇰ Granular soils lack stability when they are too dry. If their moisture content is stabilized by the addition of some chemicals, then these soils can be used successfully.
⇰ The addition of chemicals with the soil helps to retain moisture & to impart some cohesion and thus retain stability. These chemicals also reduce the dust nuisance in un-surfaced roads.
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