Control of Dispersivity of Soil using Lime and Silica Fume
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2017, Vol 5, Issue 5
Abstract
Soils which collapse or disperse to form dissolved slurry when in contact with water are termed dispersive clay. Extend of dispersivity depend on the exchangeable sodium present in the structure. Dispersion of clay occur when it is wetted and the clay particles are forced apart. Thus even under a small seepage velocity it is seen dispersive soils erode and can affect the stability of earth and earth retaining structures. In these soils the attractive forces are less than the repulsive force under saturated conditions and this will help the particles to segregate and to move in suspension. Many structures are built on clay because of its low permeability. In the past dispersive clay soils were not recognized and failure occurs before dispersive action was identified. This paper mainly deals with dispersion study in sodium bentonite by performing crumb test and double hydrometer test, which proved that the soil is indeed highly dispersive. Hydrated lime (Ca(OH)2) and silica fume were chosen as stabilizing agents for making the soil non-dispersive. From the modified free swell and double hydrometer tests, it was found that the optimum amount of lime required was 5%, whereas the optimum amount of lime and silica fume was 2% and 12%. Using the optimum amount of lime and lime and silica fume, percentage dispersion was reduced to 18.75% and 13.45% respectively thereby making the soil non-dispersive.
Authors and Affiliations
Amina S M, Rani V
Keywords
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