Journal of Engineering Science and Technology Vol. 12, No. 12 (2017) 3188 - 3202 © School of Engineering, Taylor’s University 3188 EFFECTS OF INORGANIC SALT SOLUTION ON SOME PROPERTIES OF COMPACTED CLAY LINERS KHALID R. MAHMOOD AL-JANABI*, BASIM MOHAMMED ABDULLAH College of Engineering, University of Anbar, Ramadi Campus, Anbar Province-Ramadi, Iraq *Corresponding Author: kr_aljanabi@uoanbar.edu.iq Abstract Processed and natural clays are widely used to create impermeable liners in solid waste disposal landfills. The engineering properties of clay liners can be significantly affected by the leachate from the waste mass. In this study, the effect of inorganic salt solutions will be investigated. These solutions used at different concentrations. Two type of inorganic salt MnSO 4 and FeCl 3 are used at different concentration 2%,5%, 10%. Clay used in this study was the CL- clay (kaolinite). The results show that the consistency limits and unconfined compressive strength increased as the concentration of salts increased. While the permeability tends to decrease as salt concentration increased. Also, the compression index decreases as the concentration increased from 2% to 5%. The swelling index tends to increase slightly as the concentration of MnSO 4 increased, while its decrease as the concentration of FeCl 3. In this paper, it is aimed to investigate the performance of compacted clay liner exposed to the certain chemicals generated by the leachate and their effects on the geotechnical properties of compacted clay liner such consistency limits, permeability coefficient, compressibility characteristics and unconfined compressive strength. Keywords: Inorganic salts, compacted Clay, liners, Engineering properties. 1. Introduction Landfills used as an engineering system for the disposal of waste and prevent its impact on the environment and the health of human. Modern landfill barriers consist of impermeable layers called compacted clay liner (CCL), which may be defined as a layer of clay used as a hydraulic barrier to prevent the transport of pollutants into the soil and groundwater, as well as prevent the emission of gas into the atmosphere. Mitchell [1] showed that the mechanicals and hydraulic behavior of clay soil can be strongly affected by the clay-fluid system interaction. For this reason