Road performance of graphene oxide modified cement-based composites

Abstract

In order to investigate the effect of graphene oxide (GO) on the pavement performance of cement-based composites, modified cement-based composites with different content of GO were prepared, and the pavement performance was evaluated by the fluidity, strength and frost resistance. The modification mechanism was investigated by scanning electron microscope (SEM) and X-ray diffraction. The results show that the mechanical properties and frost resistance of GO modified cement-based composites increase greatly and the fluidity decreases. When the content of GO is 0.04% (by mass), the strength of cement-based composites is the highest, and the compressive and flexural strength of the composites at 28 d increase by 31.3% and 44.2% compared with the group with the content of GO of 0. When the content of GO is 0.02%, the cement-based composites have the best frost resistance. After 300 cycles of freezing-thawing, the mass loss rate is only 0.6% as well as the residual compressive strength ratio and residual flexural strength ratio are 69% and 75% respectively. According to the micro-analysis, oxygen-containing hydrophilic groups (hydroxyl group, carboxyl group, etc) on the GO surface can provide growing points for the crystallization of cement hydration products and the calcium silicate gel (C-S-H) grows and cross-links on it and the effect of cross-linking increases with the hydration age.GO can improve the mechanical properties and frost resistance of cement-based composites.