Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 10, Issue 3, 2008; Page No.(481-485)

A STUDY ON THE EFFICACY OF ELECTROLYTES IN THE STABILISATION OF EXPANSIVE SOIL SUBGRADE

SRINIVAS MANCHIKANTI AND G.V.R. MASADA RAJU

Abstract

Black Colton soils also known as problemetic soils, are basically susceptible to detrimental volumetric changes, with changes in moisture. The swelling properties or the expansive soil, depends on the type of clay mineral, crystal lattice structure, cation-exchange capacitt, ability or water absorption, density and water content. All over the world, efforts have been made to device ways and means to solve the problems due to expansive soils. Many techniques have been tried to alleviate the problems posed by expansive soils, which have met with limited success and hence the attempts to device better techniques are still going on. In order to control the deterioration and distress of the pavements, there is a need for a systematic study, for understanding the behaviour of expansive soils. Chemical modification by adding lime and lime-pozzolana mixes has been practiced for the last two decades. However, due to low solubility (about 1.2 g/lit @ 20°C) of lime and mixing problems involved, many researchers have reported that, CaC1, could be an effective alternative to conventional lime treatment, due to its ready dissolvability in water and to supply adequate calcium ions, for exchange reactions. In this paper an attempt is made to study the efficacy of electrolytes on the properties of expansive clay. It is observed from the study that, the FeC13 - treated test track showed better performance when compared with that of the untreated track.

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