Effect of Graphene Oxide on Properties of Cement-based Self-leveling Mortar

In this paper, a graphene oxide (GO) dispersion at a concentration of 7.4 g/L was prepared by oxidation and ultrasonic dispersion, and was then added into the cement-based self-leveling mortar to determine the effects of GO dose on fluidity, setting time, mechanical properties and the durability of the fresh and hardened mortar. Moreover, the modification mechanism was analyzed by means of XRD, SEM and MIP. We found that the best dosage of GO is 0.04wt%, under which, compared to the control sample, the self-leveling mortar achieves increments in flexural strength, compressive strength, wear-resistance of 38.9%, 27.7% and 48.8%, respectively, the chloride ion permeability of the sample was 98.5% lower than that of the blank sample, although there can be observed slight decreases in fluidity and setting time. Microscopic test results indicated that the GO can promote the hydration process of Portland cement and regulate the microstructure of the hydration products, and in consequence, contribute to mechanical properties and durability improvements of the hardened cement-based self-leveling mortar. © 2019,Materials Review Magazine. All right reserved.