Pore morphology based on graphene oxide modified steel fibre concrete for freeze–thaw resistance

The effect on frost resistance of the pore morphology and pore space distribution of graphene oxide-steel fiber reinforced concrete (GO-SFRC) has been researched systematically by X-ray computed tomography (X-CT) technology. As graphene oxide is added to steel fiber concrete, the pore morphology and spatial distribution will be altered. Combined with the strength loss and dynamic elastic modulus loss of GO-SFRC specimens after freeze–thaw cycles, the effect that graphene oxide shows significant effect on the frost resistance of steel fiber concrete through analyzed. The results demonstrate that GO-SFRC concrete has significantly better frost resistance than ordinary SFRC concrete based on the analysis of compressive strength loss and dynamic elastic modulus loss of the specimens. Experiments show that the porosity and pore distribution was different for the five GO-SFRCs and the pore sphericity was closely related to the content and dispersion of graphene oxide. Overall, the GO coordination regulates the relationship between porosity, sphericity, and pore size. In addition, the compressive strength of graphene oxide-steel fiber-reinforced concrete was also analyzed in terms of pore parameters, such as pore sphericity, flatness, and porosity.