Introduction to the application of graphene in concrete
Key words
Graphene, Graphene Oxide, Concrete, Cement, Concretene
Graphene is a new type of two-dimensional nanomaterial with a thickness of only one carbon atom, which is formed by sp2 hybridization of carbon atoms. It has excellent mechanical, thermal and electrical properties, and is the nanomaterial with the best comprehensive properties. Graphene cement-based composites are expected to have excellent strength, toughness, durability, and electrical conductivity.
Both graphene and graphene oxide have been used to improve the flexural and resistive strength of cement. Functionalized graphene nanosheets have also been used and have been found to increase cement strength by forming crosslinks with the cement matrix.
In addition to increasing strength, it can also improve the appearance and environmental performance of concrete. Concrete cleans itself and provides a catalytic environment for harmful molecules to break down into harmless compounds. This contributes to the creation of ecological concrete and improves the implementation environment.
The incorporation of graphene can improve the chloride ion permeability and sulfate attack resistance of cement-based composites.
The self-shrinkage stress of the cement material incorporated with graphene can be relieved. Graphene can prolong the crack propagation path, effectively absorb and disperse the energy load, thereby improving the self-shrinkage performance of the cement matrix; the addition of graphene can promote the hydration of cement and reduce the porosity, Improve the impermeability of the matrix; when the matrix is eroded, the encapsulation effect and bridging effect of graphene can prevent the migration and diffusion of ions.
At present, the world's first graphene-enhanced concrete has been poured in the UK, named Concretene.
