Abstract: Carbon nanotubes could be widely used to enhance the flexural toughness of cement-based materials due to the excellent mechanical properties. However, the weak interfacial adhesion between carbon nanotubes and cement-based materials is an urgent problem need to be solved. In this research, the surface of multi-walled carbon nanotubes was modified by self-assembly method, and the core-shell structure nanowires (CNTs@SiO2) of silicon dioxide coated carbon nanotubes were synthesized. The original carbon nanotubes (O-CNTs), purified carbon nanotubes (P-CNTs) and CNTs@SiO2 were incorporated into cement to investigate the influence of carbon nanotubes on the mechanical properties of cement-based materials. Hydration heat, X-ray diffraction analysis (XRD), thermal analysis (TG-DTG), scanning electron microscopy analysis (SEM) and other test methods were applied to explore the mechanism of their effect on the mechanical properties of cement-based materials. Compared with O-CNTs and P-CNTs, the incorporation of CNTs@SiO2 can significantly improve the early mechanical properties of cement, and with the increase of content of CNTs@SiO2, the flexural strength shows a tendency to increase first and then decrease; when the content of CNTs@SiO2 is 0.08% (mass fraction, the same below), the effect of improving the flexure strength of cement is the best, and the 3 d flexural strength can be increased by up to 18.8%. The reason is that the incorporation of CNTS@SiO2 promoted the hydration rate of cement, the nano-silica on the surface of CNTs@SiO2 could react with the calcium hydroxide in the hardened cement to form a second hydration product, which enhanced the interfacial adhesion. Therefore, the mechanical properties of cement are improved. The research provides a new idea for the modification of carbon nanotubes on the cement-based materials.
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2023, Vol. 37 
