Effect Of Graphene Oxide On Cement-based Materials Corrosion Resistance Performance

Graphene oxide(GO)is a two-dimensional sheet nanostructures that have ultra high specific surface area and superior mechanical and flexibility properties,in which structure contains a large number of active groups: hydroxyl group(-OH)、carboxyl(-COOH)and an epoxy group(-O-).The presence of these reactive groups results GO possess good hydrophilic,and easy to be dispersed into nano dispersion prepared in water,and also easy to be composited with other compounds forming intercalation complexes.For the defect of cement concrete,there are a lot of micro-cracks and pores in its interior,it directly led concrete to be a high brittleness、low tensile strength and poor durability structure.Therefore,the main purpose of this paper is to explore the effect of graphene oxide on cement-based materials working performance、mechanical properties and corrosion resistance performance.GO were prepared by Hummers method and ultrasonic dispersion,and the structure of GO was characterized by SEM、TEM、FT-IR、XPS.The effect of different dosage of GO on the cement paste physical properties and hydration products were investigated.XRD results show that GO can participate in the hydration reaction,effectively regulate the growth rate of calcium hydroxide and refining the crystal structure,then makes the structure more compact when the GO were introduced on cement-based materials.The mechanical testing analysis show that when the dosage of GO and PC were 0.06% and 0.65%,the 3 days flexural strength and compressive strength respectively increased by 45.8 percent and 59.4 percent,while the 28 days flexural strength and compressive strength respectively increased by 33.1 percent and 29.1 percent when compared with the reference cement mortar.SEM fracture surface results show that the hydration products were neatly arranged and interlaced each other together,so that the overall structure were more compact when incorporated with GO on cement mortar.Therefore,the introduction of GO on cement-based materials can effectively improve the flexural strength and compressive strength.The effect of different dosage of GO in different salt solution respectively after long soak and wet and dry cycle function on the cement-based materials corrosion resistant were investigated.The results indicated that different dosage of GO play a different level improvement in the corrosion resistant effect after long soak and wet and dry cycle function.By analyzing the specimen mass loss rate,flexural strength and compressive strength corrosion coefficient shows that,the cement-based materials corrosion resistant were significantly improved when the dosage of GO was 0.03% and 0.06%.SEM results show that the effect on the reference specimens internal structure results in partial incompact and there were obvious corrosion signs be found inside the cement structure,while the effect on the dosage of 0.03% GO specimens internal structure results in compact and there weren’t corrosion signs be found inside the cement structure.Spectrum analysis show that the effect on the reference specimens internal structure finds quantities of corrosion ion,while the effect on the dosage of 0.03% GO specimens internal structure finds fewer of corrosion ion exist.The results indicated that when the dosage of GO were 0.03%,it can effectively hinder the corrosion ion penetrated into the concrete structure,then improve the corrosion resistance effect on the cement-based materials.