Experimental Study On Effects Of Chemical Solution On Permeability Of Cemented Soil

Over the past decade, cemented soil has been widely used in water conservancy engineering, civil engineering and other engineering fields due to its good anti permeability and other engineering advantages. Many scholars have carried on a more in-depth study of engineering properties on cemented soil. At present, environmental pollution problems have become more serious. Industrial emissions sewage and exhaust are changed into common corrosive media on cemented soil engineering applications, some of which become sulphate solution and acid alkali solution. Cemented soil were soaked in the chemical solution which has an effect on antipermeability and mechanical properties. How to evaluate the corrosive ions impact on the strength properties of cemented soil, ensuring the life of the project, is the key of cemented soil material in the presence of corrosive ion pollution conditions to promote the application. The research has important theoretical significance and engineering application value.In this paper, review of recent research progress at home and abroad, on the basis of the existing research on the cemented soil material corrosion to analyze different chemical solutions environment, different cement content and different corrosion age on the permeability and mechanical properties of cemented soil by laboratory simulation experiments. The main work:(1)Prepare 150 specimens of diameter 60 mm, height 40 mm. Prepare 225 specimens of the flowing inside diameter 70 mm, the mouth inside diameter 80 mm, height 30 mm. Prepare 225 specimens of side length 70.7 mm× 70.7mm × 70.7 mm.(2)By corrosion of cemented soil test with different concentrations of sodium sulfate solution got cemented soil unconfined compressive strength, shear strength, cohesion, internal friction angle, permeability coefficient of variation.(3)By cemented soil penetration test with different pH solution conditions(curing 7d, 15 d, 30 d and 60d) and unconfined compression test(curing 7d, 15 d, 30 d, 60 d and 90d) got the variation of cemented soil permeability and cemented soil unconfined compressive strength variation. By cemented soil triaxial tests with different pH solution(curing 60d) got cemented soil shear strength, cohesion, internal friction angle variation.(4)Scanning electron microscope cemented soil microstructure of test specimens after the destruction, the effects of different acid alkali environment on cemented soil microstructure, to explore the mechanism of acid alkali environment effect on permeability and mechanical properties of cemented soil.