论文部分内容阅读
The cement stabilized soil in natural condition, as well as stabilization in corrosive site, will be influenced by environmental pollution such as acid rain, seawater invasion or industrial pollution, which will lead to deterioration of the structure.In order to simulate and study the erosion effect process such as the changes of corrosive degree of surface, compression strength of cement soil samples and SO42-concentration of corrosive solutions, a series of tests are conducted on the cement soil blocks cured in different concentrations of MgSO4, H2SO4 and Na2SO4 solutions, including taking photos, compressive strength tests, and measuring SO42-concentrations and Mg2+, H+ or Na+ concentrations.The test results show that the corrosive degree of the sample surface increases while the compression strength decreases with the increase of the corrosive solution concentration at the same erosion time, and that the corrosive degree increases with the corrosive time.Inorganic compound solutions can be arranged in a series for the influence as follows: Na2SO4 > MgSO4> H2SO4, When the solutions exist SO42-ion, the influence degrees of cations Na, Mg2+, H+ are Na+> Mg2+> H+.The relationship of the compressive strength and anion/cation concentrations are analyzed, the relationship between the SO42-concentration and the compressive strength of cement soil is belong to a triangle area, and the compressive strength is decreases with the increase of the Mg2+ concentration of MgSO4 solutions and Na+ concentration of Na2SO4 solutions and is increases with the increase of pH value of H2SO4 solutions.By calculating main chemical ingredients and analyzing the mechanism, the corrosive type of H2SO4 and MgSO4 solutions to cemented soil is a composite type of resolving and crystallizing combination, that of Na2SO4 solution to cemented soil is a composite type of dissolving and crystallizing combination.