International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 5878 Study on the Effect of Salt Solution on Geotechnical Properties of Clayey Soil Shanu Joseph 1 , Nirmal John Joy 2 1 PG Student, Geomechanics and Structures, Dept. of Civil Engineering, Saintgits College of Engineering, Kottayam, Kerala, India 2 Assistant Professor, Dept. of Civil Engineering, Saintgits College of Engineering, Kottayam, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – Studies on soil- pollutant interactions are essential in the field of geoenvironmental engineering due to increase in soil contamination problems. Soil pollutant interaction changes soil behavior and also can lead to various geotechnical problems. In the present study effect of salt solution on geotechnical properties like consistency limit, compaction test, unconfined compressive strength and CBR were determined. Salt solution used is sodium chloride with different concentrations deionized water. Clayey soil belonging to CH classification was used for the study. Experimental results shows considerable changes in the properties. Key Words: Clay, Salt solution, Consistency limit, Compaction, UCS, CBR 1. INTRODUCTION At present, as economy develops rapidly and industrialization pushes on world, soil pollution is getting more and more serious. Major sources which cause ground contamination can be of disposal of oil field brines, hazardous chemical waste, land fill leaching, sea water intrusion, surface impoundments etc. All type contamination have direct or indirect effect on various soil properties. Modification of soil properties can lead to several geotechnical engineering problems such as landslides, ground subsidence and settlement, structural instability of substructures, corrosion and durability of foundation problems. Based on geotechnical researches pore properties of the fluid have a direct impact on behavior of clay like fabric and the bonding mechanism. In this investigation influence of these parameters by salt solution is determined. The term ‘salinity’ represents the soluble salts total concentration in the soil. Increase in salt content leads to salinization. Salinity in pore water influence on the behavior of clay particles as a result to the chemical interaction that may occur between the soil particles and the ions in the pore water. Salt mainly consists of positively charged cation and a negatively charged anion (ie, mainly Cl - anion). The Cl − anion shows little affinity in its adsorption to soil components. Thus, Cl − movement within the soil is largely determined by water flows. The current study deals with the effect of adding salt solution like NaCl in various concentrations to study the variation in the properties of soil. 1.1 Scope  Understand the soil response to salt contamination and find available methods to control them.  Give attention to mineralogical changes caused due to the behavior of soil interacted with contaminants. 2. LITERATURE SURVEY Recently a number of studies have been performed to look into the effect of the chemistry of pore water and its impacts on the geotechnical characteristics of soil. The salinity of the water has been shown to effects on the geotechnical properties of fine soils used in Korchay dam core had been studied Ajalloeian, et al.[10]. Several soil measurments as Atterberg limits, compaction, consolidation, direct shear and dispersion have been carried out by the use of waters of different salt concentrations like distilled, half saline and saline waters. The charges in the geotechnical properties of the soil were neglected. Results revealed the values of the Atterberg limits, compression index and swelling index decrease and consolidation coefficient and shear strength parameters increase as the amount of pore water salinity increases. When comparing those results with other tests carried out using water that has been desalinized, the effect of water salinity on consolidation under high pressures is not consideration. The sea water effects on consistency limits and compressibility properties of clayey soils of low and high plasticity were examined by Aksoy, et al. [12]. The results shows that sea water impacts were almost negligible on the tested consistency limits and compressibility characteristics of soils when they have liquid limits up to 110%. The sea water effect is mostly noticed on the consistency limits and compressibility of Na-bentonites. Influence of NaCl and CaCl 2 at various concentrations on compressibility of mixtures of basalt soil and bentonite was examined by Mazzieri et al. [2]. Along with this impact of distilled water and calcium chloride in a modified bentonite on hydraulic conductivity and effect of NaCl on hydraulic properties of Bentonite and Bentonite – palygorskite mixture were studied. It can be concluded that the compressibility of the soil mixture was reduced with increasing salt concentration of the pore fluid. In the case of hydraulic conductivity it is increased