▎ 摘　　要

Modified graphene oxide (GO) has widened the spectrum of its applications in the preparation of highly effective composite materials. This paper reports the effect and mechanism of modified butylated GO (C4H9-GO) on the mechanical properties of reinforced cement-based composites. Experimental findings showed that compared with the pristine GO/cement composite, the fluidity of 0.03 wt% C4H9-GO/cement was slightly improved while its bending strength and compressive strength were increased by 10.50% and 17.00%, respectively, after curing for 28 days. Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, mercury intrusion porosimetry, and surface area analysis revealed that C4H9-GO can effectively increase the degree of hydration, promote the formation of C-S-H bonds, Aft and Afm crystals (two kinds of calcium sulfoaluminate hydration), and inhibit the generation and development of cracks and pores thus increasing the bending and compressive strengths of the C4H9-GO/cement composite. Based on the experimental and characterization findings, a suitable mechanism for the enhancement in mechanical properties of C4H9-GO/cement was proposed. This study provides useful findings for the simplified and cost-effective preparation of C4H9-GO/cement for applications in highway and bridge construction industries.