Abstract

In this study, nano-CaCO3 and nano-SiO2 were effectively employed to reduce the permeability of carbon fibre-reinforced concrete (CFRC) with a water-cement ratio (W/C) of 0.3 and 0.4. Further, the mechanism of these nanomaterials when modifying the microstructure of CFRC is discussed. It was found that the addition of carbon fibre demonstrated a decrease and increase effect for the permeability of plain concrete (PC) with W/Cs of 0.3 and 0.4. The addition of the nanomaterials makes the microstructure of CFRC with a W/C of 0.3 with a lower porosity, while significantly reducing the connectivity of the microstructure of CFRC with a W/C of 0.4. The effect of these nanomaterials on decreasing the permeability of CFRC is more obvious when the W/C increases from 0.3 to 0.4. Additionally, the effect of nano-CaCO3 and nano-SiO2 on improving the post-peak behaviour of CFRC with a W/C of 0.3 is equally more obvious.

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