In order to enhance the interface properties of carbon fiber/concrete matrix,and investigate the effects of graphene oxide grafted carbon fiber reinforcement(CF-GO)on the mechanical properties of concrete,by using amino silane as bridge material,carbon fiber and graphene oxide were tightly bonded through chemical bonds and CF-GO was prepared.The microstructure and functional groups of CF-GO were characterized by scanning electron microscopy and infrared spectroscopy.Graphene oxide was successfully grafted to the surface of carbon fiber and the interfacial shear strength of CF-GO was tested.CF-GO modified concrete(CF-GO/C)was prepared,its mechanical properties were tested and compared with those of carbon fiber modified concrete.In addition,the modification mechanism of CF-GO on the mechanical properties of concrete was analyzed.The results show that the interfacial shear strength of CF-GO increases by 25.37％compared with that of carbon fiber.With the increase of CF-GO content,the flexural and compressive strength of CF-GO/C first increase and then decrease.The optimal content of CF-GO is 0.3vol％,and the optimal content of carbon fiber is 0.2vol％.The flexural and compressive strength of CF-GO/C increase by 33.21％and 24.63％respectively with the optimal CF-GO content.Graphene oxide on the surface of CF-GO enhances the interface of CF-GO/concrete matrix physically and chemically by improving the mechanical bite between CF-GO and concrete matrix and promoting the formation of hydration products on the surface of CF-GO.
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