Stabilization of expansive soils with lime (A Case Study on the Adura-Burbey DS6 Road Segment)

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Addis Ababa University


Expansive soils occurring in arid and semi-arid climate regions of the world cause serious problems on civil engineering structures. Such soils swell when given an access to water and shrink when they dry out. Several attempts are being made to control the swell-shrink behavior of these soils. Soil stabilization using chemical admixtures is the oldest and most widespread method of ground improvement. In this study, hydrated lime, were used for stabilization of expansive soils. Hydrated lime is one of the chemical stabilizers used in expansive soils. Hydrated lime of percent varying from 2 to 12 percent (by dry weight of the soil) is used to investigate the physical and chemical properties of the expansive soils. The following tests are conducted to evaluate the properties of the expansive soils before and after the addition of lime.  Atterberg limits  Shrinkage limits  Linear shrinkage  Specific gravity  Free swell  Moisture density relation ships  California bearing ratio (Soaked CBR) CBR Swell  Unconfined Compressive strength( immediate and 7 days cured) The liquid limit has decreased, with the increase of plastic limit. As a result of this the plasticity index of the stabilized soil has improved to the required level. The shrinkage limit, specific gravity, CBR and Unconfined compressive strength of the stabilized sample have increased with the addition of lime. Swelling percentage (CBR Swell) decreased with increasing stabilizer percentage. The lime content of which the CBR values improved for the use of improved subgrade is found out to be 12% by dry weight of the soil. But further investigations are needed for its cost and other stabilization techniques and chemical stabilizer.



Road & Transport Engineering