Study On The Mechanical Properties Of Sludge Reinforced With Basalt Fiber Reinforced Cement

In our country,a large amount of waste silt will be generated in actual projects such as the construction of highway projects and the dredging projects of rivers and seas.Untreated waste silt is difficult to be directly used as engineering materials.However,if it is directly dumped,it not only takes up valuable land resources,but also has a bad impact on the surrounding environment.In addition,as my country vigorously promotes the construction of infrastructure and various river and lake projects,sea-reclamation projects,dike projects and road projects,leading to a shortage of high-quality materials.Cement chemical materials are commonly used at home and abroad to chemically solidify them.However,the treated materials often show the phenomenon of water loss,shrinkage,cracking,and water disintegration,which are difficult to meet the requirements of long-term strength stability and deformation stability in the project.In order to solve this problem,some scholars proposed to use fiber reinforcement to improve its mechanical properties.Basalt fiber is a kind of green environmental protection,high strength and strong corrosion resistance.It is one of the four major fibers developed in China.Based on the above research background,this paper takes the dredged silt from a river bank in a certain project in Huangshi as the research object by adding basalt fiber and cement to solidify the silt.In this paper,unconfined compressive strength tests of fiber-reinforced cement-solidified silt samples with different curing ages,different fiber mixing ratios and cement mixing ratios are carried out,and the strength prediction formula is established.The research results show that adding fibers can effectively improve the compressive strength of the solidified sludge.In addition,by comparing the predicted value of the strength prediction formula with the measured value of the actual test,it is found that the model has a maximum difference of 9.3%,which verifies the feasibility of the strength prediction formula.In order to explore the effect of fiber incorporation on the improvement of the tensile strength of cement-solidified silt,this paper conducts indirect tensile strength tests on fiber-reinforced cement-solidified silt samples with different curing ages,different fiber mixing ratios and cement mixing ratios.And through the grey relational degree theory to analyze the order of the factors affecting the tensile strength: cement,curing age,fiber.Finally,based on the unconsolidated and undrained triaxial shear test,the changes in the shear strength parameters of the fiber reinforced cement-solidified silt soil under different fiber mixing ratios are studied and analyzed,and the stress of the sample is analyzed.-Strain characteristics.Finally,based on the Popovics model,the stress-strain curve is divided into 3sections and expressed in sections.Comparing the fitted curve of the model with the stress-strain curve obtained from the test,the results show that the fitting effect is better,which verifies the feasibility of using the Popovics model to fit the stress-strain curve of the basalt fiber-reinforced cement-solidified sludge in this paper.