Modifying performance of bridge deck concrete compositing graphene oxide/steel fibre

To enhance the mechanical properties and durability of bridge deck concrete, this paper uses graphene oxide to modify steel fibre-reinforced concrete. By selecting different graphene oxide pre-treatment methods and doses, compressive strength, flexural strength, chloride ion permeability and frost resistance tests are performed to investigate the influence of graphene oxide pre-treatment methods and doses on the properties of steel fiber reinforced concrete. The results showed that ultrasonic pretreatment of graphene oxide was better than mechanical mixing treatment on the performance of steel fibre. The strength development of both rise and then fall with the increase in dosage, and the optimal dosage was 0.075%. At this time, the compressive strength of the ultrasonic treatment group at 7 d and 28 d were 46.33 MPa and 64.58 MPa, respectively, and the flexural strength was 6.36 MPa and 8.13 MPa, respectively. The depth of penetration of the chloride ions is 3.87 mm and the rate of loss of mass after 300 freeze-thaw cycles is only 6.33%. Extensive research has shown that adding graphene oxide to fibre-reinforced concrete greatly improves its mechanical and durability properties, prolonging bridge deck concrete's service life.