Research On Strength And Mechanism Of Cemented Soil Under Erosion Environment And Freezing-thawing Condition

Cemented soil is a kind of mixture consisting of Portland cement, soil,aggregate and water. It gets the advantages of low price, wide material source, goodperformance in convenience construction etc.. So it has been used for groundstabilization, building excavation engineering, underpinning and many other projects.Therefore, many scholars have made a lot of researches on strong influence factorsand its mechanical properties. The ambient environment has seriously erosion effecton cemented soil. It may lead to reduction of bearing capacity for buildingfoundation, differential settlements and other engineering problems. Furthermore,freezing and thawing in the northern region cause serious harm to the durability ofcement soil. It becomes more important for researching on mechanical properties ofthe soil erosion condition in a complex environment. Currently, experts at home andabroad are studying on the environmental pollution or the strength of cemented soiland freezing and thawing cycle effecting change law is studied. However, study ondual effect of cemented soil in mechanical properties is very little. Dual effect ismore close to the actual engineering condition. Therefore, the research of dual effecton mechanical properties of cement soil will become a hot research field.The experimental soil of this paper is silty clay in the Hohhot, the compressivestrength variation rule of cemented soil in different environmental pollution erosion(different chemical solution, the concentration of the solution with differentconcentration and different dual corrosion effect cycles) were studied by using theresearch methods of laboratory simulation. The surface erosion phenomenon of thespecimen was recorded by real time observation. The causes of variation rule ofcompressive strength were analyzed.The content of this paper are as follows:1. The cement content of soil quality is determinate to10%, the additive agentfor fly ash and ganister sand. The water cement ratio is determinate by multiple trialtest. At the same time, the strength of cemented soil under different additive agent isanalyzed and studied; the optimal ratio is selected and employed in follow-up test.2. The strength variation rule of cemented soil under acid and alkali erosion is studied. The acidic solution and alkaline solution includes H2SO4, NaOH andNa2CO3. The erosion mechanism of the PH is analyzed.3. The strength variation rule of cemented soil under salt erosion is studied. Thesalt solution includes MgSO4, CaCl2and MgCl2. The salt erosion mechanism isanalyzed.4. Leading the freezing and thawing cycle test on cemented soil under differentchemical erosion. Chemical solution includes NaOH, MgSO4, Na2CO3and CaCl2.The compressive strength is tested. The strength variation rule of cemented soilunder dual corrosion is researched and analyzed. The dual corrosion mechanism isanalyzed.