Study On Mechanical Properties And Modification Mechanism Of Multilayer Graphene Oxide-Cement-based Materials

Cement is one of the most used construction material today.It is widely used in many projects',such as housing construction,water conservancy and bridge engineering.However,the excessive use of cement materials and environmental pollution problems are extremely serious.In addition,cement-based materials have low flexural strength and poor cracking resistance,\which limit the development of cement-based materials.Macroscopic cracks in cement-based materials are formed by micro-crack propagation in hardened cement,affecting the macroscopic mechanical properties of the material.Multilayer graphene oxide is an oxidation product of grapheme.The excellent mechanical properties of multilayer graphene oxide have attracted wide attention in enhancing the properties of cement-based materials.Multilayer graphene oxide has high specific surface area and surface chemistry/active,it offers mechanical and chemical interactions with cement-based materials to improve the mechanical properties of the composites.Therefore,we consider adding multilayer graphene oxide to the cement-based material to improve the microstructure of the material and enhance its mechanical properties.In this study,the mechanical properties,microstructure and application prospects of multilayer graphene oxide-cement matrix composites were investigated by adding multilayer graphene oxide.The main research contents are as follows:(1)The microstructure and hydration products of the cement mortar were observed and tested by scanning electron microscope and X-Ray diffractometer.The test results show that multilayer graphene oxide acts as carriers for promoting the production of cement hydration products such as flower crystals and needle crystals,helps to the regular growth of cement hydration products and forms a dense structure.In addition,multilayer graphene oxide can form barriers to prevent crack propagation,the propagation of cracks in cement mortar is inhibited,and the mechanical properties of cement mortar were enhanced.(2)It was found that the doping of multilayer graphene oxide resulted in a significant increase in the compressive strength and flexural strength of the cement mortar.With the increase of graphene oxide content,the compressive strength and flexural strength of mortar show a trend of increasing first and then decreasing.The addition of 0.05 wt% multilayer graphene oxide has the greatest increase in compressive strength and flexural strength of cement-based materials.Therefore,multilayer graphene oxide nanosheets can be used to optimize the microstructure of cement-based materials and improve its mechanical properties.(3)Statistics and analysis of the influence of nanomaterials on the performance of cement-based materials.The application examples of nano-concrete in engineering are compiled.Explore the application prospects and economic feasibility of multilayer graphene oxide-cement based materials in engineering.