Study On The Corrosion Resistance Of Graphite Oxide Modified Cement-Based Materials To Sulfuric Acid And Ammonium Sulfate

Concrete structures are widely used in industrial buildings due to their excellent performance.Sulfuric acid and ammonium sulfate are widely used as industrial raw materials in chemical,metallurgical,and petroleum industries.The corrosion damage of concrete caused by sulfuric acid and ammonium sulfate is an important reason for the decrease in durability of industrial buildings.As a new type of two-dimensional lamellar carbon nano material,Graphite oxide oxide(GO)has the advantages of high strength,large specific surface area and many active functional groups,and is considered to be one of the most ideal cement-based material modification materials.However,the current research is mostly to explore its impact on the mechanical properties of cement-based Strength of materials,and there is less research on the impact of GO on the corrosion resistance of cement-based materials to sulfuric acid and ammonium sulfate.This article adopts a combination of experimental research and theoretical analysis to systematically study the influence of GO on the corrosion resistance of cement-based materials,and reveals the improvement mechanism of GO on the corrosion resistance of cement-based materials to sulfuric acid and ammonium sulfate,providing an effective way to improve the lifespan of concrete structures in industrial corrosive environments.The main research content is as follows:(1)We conducted erosion tests on GO modified cement mortar under the action of sulfuric acid and ammonium sulfate,and analyzed the effects of erosion age,p H value of sulfuric acid,type of corrosion solution,GO content on physical properties such as erosion depth,mass loss rate,saturated surface dry water absorption,and relative dynamic elastic modulus of cement mortar,as well as the degradation of mechanical properties such as compressive strength and flexural strength.The results indicate that both erosion solutions can increase the depth of erosion,mass loss rate,and saturated surface dry water absorption of cement mortar,while reducing the relative dynamic modulus of elasticity,compressive strength,and flexural strength.The lower the p H value of sulfuric acid solution,the more severe the degradation of physical and mechanical properties.In a mixed solution of sulfuric acid and ammonium sulfate,the degree of degradation of physical and mechanical properties of cement mortar is greater than that of a single corrosive solution.At the same age,the degradation of ordinary mortar is more severe than that of modified mortar.A small amount of GO(with an optimal dosage of 0.04%)can significantly improve the resistance to sulfuric acid and ammonium sulfate corrosion of cement-based materials.When p H=2 sulfuric acid corrosion for 120 days,the quality loss of modified mortar is reduced by 31.6% compared to ordinary mortar,while the compressive strength is increased by 35%.(2)The changes in pore structure,corrosion products,and microscopic morphology characteristics of GO modified cement mortar after erosion were studied through nuclear magnetic resonance,X-ray diffraction testing,and scanning electron microscopy analysis.When the erosion age in the mixed solution is 120 days,the pore size in ordinary mortar is greater than 1 μ The number of multi damage holes in m is three times that of 0.04%GO modified mortar.The addition of GO not only significantly improves the pore size distribution,reduces the number and proportion of macropores,hinders the transport of erosion ions within the matrix,but also inhibits the initiation and propagation of microcracks during the erosion process.(3)Using MATLAB software,the Convolutional neural network prediction model program was compiled,and the prediction model of compressive strength of cement mortar under the action of sulfuric acid and ammonium sulfate that meets the accuracy requirements was constructed.The trained Convolutional neural network is used to predict the test data of the compressive strength of cement mortar,and the error between the predicted value of the compressive strength of mortar and the test results is small.