Treatment for salt expansion of sulphate saline soil

In order to decrease the salt expansion of sulphate saline soil,NaCl and CaCl2 were used to treat the sulphate saline soil respectively.NaCl and CaCl2 were added in the soil samples with salt content of 2%,4% and 6% in the experiment.The amounts of NaCl and CaCl2 were based on the value of Cl-/SO42-which was at 2,4,6 and 8.The results were compared.Moreover,the function mechanism of NaCl and CaCl2 when they were used to treat the sulphate saline soil could be proved through analyzing the change of salt expansion of the sulphate saline soil when the salt content was different.The results show that Cl-has a good effect and the effect is especially good when Cl-/SO42-is between 4 and 6;CaCl2 has double action when the amount of which is low;however,when the amount of CaCl2 is high,it has some side effect which is caused by the expansion of CaCl2 and CaSO4.The results of the study can provide effective reference for the ground treatment of sulphate saline soil in the practical projects.3 tabs,4 figs,15 refs.