Open AccessSTRENGTH BEHAVIOR OF EXPANSIVE SOIL DEPOSIT DUE TO DIFFUSION OF CALCIUM CHLORIDE SOLUTION
Author(s) -
Sangita P. Lajurkar,
Y. S. Golait,
S. R. Khandeshwar
Publication year - 2019
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2019.v04i01.013
Subject(s) - expansive clay , expansive , diffusion , calcium , chloride , geotechnical engineering , geology , mineralogy , chemistry , materials science , soil science , metallurgy , composite material , thermodynamics , soil water , compressive strength , physics
Many investigators in the past have found that chemicals like calcium chloride, potassium chloride, sodium silicate, ferric chloride etc. are effective in expansive soil improvement. Extensive work is done on calcium chloride as admixture in expansive soil for its use as construction material. In the present domain of in-situ ground improvement study calcium chloride is used as this chemical is highly soluble in water, it is economical and also is easily available everywhere. From practice point of view the main aspects of importance are increase in the bearing capacity and stiffness of the ground. The present research paper focuses on the possibility of in-situ ground improvement with respect to increase in strength by chemical diffusion in the actual ground condition. The characteristics of chemical with respect to concentration may affect the ground improvement by diffusion technique. In order to arrive, at the optimum dose of calcium chloride solution for in-situ improvement of soft clay deposit, it was thought to study soft clay soil behavior due to diffusion of calcium chloride solution with different concentrations. In the field conditions, the wetness of the soil mass from the surface to a greater depth below the surface is varying due to seasonal cyclic variation i.e. rainy to summer season and summer to rainy season. This variation of moisture content regime is also incorporated in the present study to decide upon the suitable time for ground improvement by chemical diffusion. Similarly natural expansive soil deposit found in India at different location has the different degree of swellability, may also affect the degree of improvement of natural expansive ground characteristics. Hence this variation of degree of swellability of soil also incorporated. Under the lab test condition the percentage increase in strength for soil having higher degree of swellability with low up to 147 % was observed due to diffusion of calcium chloride solution. Keywords— expansive soil deposit; percentage strength improvement (PSI), improvement by diffusion technique, calcium chloride, degree of swellability, swelling behavior