Experimental Study On Mechanical Properties And Frost Resistance Of Recycled Graphene Oxide Concrete

Recycled concrete as a kind of green renewable resources,study the basic properties of the recycled concrete improvement which is of great significance.Due to the microstructure of concrete and the mechanical properties and frost resistance of recycled concrete durability plays an important role,many scholars through the adoption of nanometer materials to enhance macro mechanical properties and frost resistance of concrete durability,and gained considerable effect.Oxidized graphene is the derivatives of graphene,has a large specific surface area,oxygen containing functional groups good hydrophilic characteristics,of cement-based composite materials can have the effect of enhanced toughening,this paper USES the graphene oxide on the mechanical property and frost resistance of recycled concrete durability experiment research.1.The graphene oxide prepared by the Hummers method was characterized by elemental analysis,infrared spectroscopy and TEM analysis.The results showed that in the suspension of GO,the oxygen content was 39.95%,and there was a single single flake like structure in the structure,and there was a hydrophilic functional group in the structure.2.In terms of mechanical properties,the compressive strength,flexural strength and splitting tensile strength of recycled graphene oxide concrete under different ages were studied.Through the experimental study,it is found that the increase of the mechanical properties of recycled concrete and the content of graphene oxide is significantly increased,but when the amount of admixture is more than 0.06%,the increase of strength is reduced with the increase of the addition of graphene oxide;the influence of the amount of oxygen on the oxygen of the recycled concrete at different ages is slightly different.When the mixing amount is the same,the age of small concrete is slightly higher than that of the older concrete.3.After the 25,50,75 and 100 freezing and thawing cycles,the quality loss rate and the relative dynamic elastic modulus of the regenerated concrete were analyzed.The frost resistance of recycled concrete was found to increase with the content of graphene oxide,but the frost resistance decreased when the amount of admixture was over 0.06%..4.By measuring the gas permeability coefficient of recycled graphene oxide in freeze-thaw cycle and establishing the relationship between the mass loss rate,relative dynamic elastic modulus and ultrasonic wave velocity,and observing the micro structure of the micro crack,the change of gas permeability coefficient and microstructure morphology after the freeze-thaw cycle of graphene oxide has been observed.It is found that the gas permeability coefficient can be used to evaluate the frost resistance of the regenerated concrete of graphene oxide.The frost resistance of recycled concrete mixed with graphene oxide will be improved,because the number of Aft crystals in the regenerated concrete mixed with graphene oxide is increased and dense,and the gap width is reduced.Small,thus increasing the compactness and enhancing the frost resistance of recycled concrete.