The Evaluation of the Performance of Lime and Sodium Chloride Behaviour on Expansive Soil
Expansive soils which expand when the moisture content of soils is increased. The clay mineral montmorillonite is mainly responsible for expansive characteristics of the soil. The expansive soils are called as swelling soils or black cotton soils. A large part of the central India and a part of the south India is covered with expansive soils. Another problem associated with expansive soils is, its strength decreases with increase in degree of saturation. Heavy damages may occur to buildings, roads, runways, pipe lines and other structures built on such soils if proper preventive measures are not adopted. Lime and soil mixtures are prepared by varying the lime as 2%, 3%, 4%, 5% and 6% of dry weight of soil. And also, another soil mixtures are prepared by varying the lime as 2%, 3%, 4%, 5% and 6% of dry weight of soil and Sodium chloride as 2%, 3%, 4%, 5% and 6% of Lime. The experimental results show that by adding lime to the soil liquid limit, plastic limit, plasticity index and flow index are reducing. And the mechanical properties dry density increases and OMC decreases and unconfined compressive strength also increases with the variation of lime. And by adding both Lime and Nacl the above parameters show the better results than Lime alone.