The effects of graphene and graphene oxide nanosheets and amine functionalized graphene on mechanical properties of mortar

In the present study, nanosheets of graphene and graphene oxide without functionalizing the surface were added to the mortar and the effects of these sheets on morphology and mechanical properties after 14 days curing in water were investigated. Three samples containing 0.28, 0.56 and 1.1 weight percent graphene, and 3 samples with these weight percents containing graphene oxide were prepared and the properties of these samples were compared with those of pure cement mortars. The results show that adding a little amount of graphene or graphene oxide nanosheets lead to a great decrease in the compressive strength of the samples, which is an unexpected result according to the mixture rule. To investigate the reason of this unusual result, the microstructure of the prepared specimens were observed by scanning electron microscope. The microstructure shows that in all of the samples there is not a good adhesion between the nanosheets and the mortar matrix. On other hand, the results show that the compressive strength of the sample containing 0.28 percent amine functionalized graphene sheets enhances by about 17.62 percent compared to the pure specimen and then begins to decreases as the nanosheets weight percent increases

کلیدواژه ها:

graphene ، graphene oxide ، amine functionalized graphene ، compressive strength