effect of pore water salinity on compaction and compressibility of clayey soils

the engineering properties of soils are generally affected by parameters such as mineral type, structure, and pore water salinity. the existing solutes of soil play a role in the electrochemical forces between particles and can change the index and mechanical properties of soil, including cohesion, compressibility, and compactibility. this study investigated the effect of sodium chloride, sodium sulfate, and sodium carbonate on compressibility and compactibility characteristics of clayey soil. for this purpose, 18 treatments were prepared using three types of salt at six concentrations (0%, 0.5%, 1%, 2%, 5%, 10% by weight of soil). consolidation and compaction tests were conducted with three replications on the samples to determine the compression index (cc), coefficient of consolidation (cv), optimum moisture content (ωopt) and maximum dry density (γdmax) of soil samples. statistical analysis using spss software showed that the salinity of the soil had no significant effect on the optimum moisture content and maximum dry density of the soil. the compression index and coefficient of consolidation were significantly affected by both the type and concentration of the solutes in the saturated extract of the soil.