the effect of temperature on the behavior of an expansive soil during drying and wetting cycles

in this research the mechanical behavior of an expansive soil (with different pore fluid) was investigated under the constant and variable temperature through experimental tests. the soil samples with different pore fluid (distilled water, nacl and cacl2 with concentration of 250 gr/lit) were prepared by static compaction method. experimental testes were conducted in two modified odometer under 10 kpa surcharge pressure at constant and variable temperature. the axial deformation of samples were determined during each test. the results showed that equilibrium condition is achieved nearly after 5 cycles. the reduction of swelling potential at equilibrium condition for sample with distilled water as pore fluid is more than samples with nacl and cacl2 solutions. in addition comparing the results for samples with nacl and cacl2 solution in variable and constant temperature indicated that reduction of swelling potential is not the same.