Effects of Dual Incorporation of Nano-SiO₂ and Nano-CaCO₃ on the Abrasion Resistance and Microstructure of Concrete

Abstract

Seven sets of concrete containing different mass ratios of nano-SiO₂ (0%–5.0%) and nano-CaCO₃ (0%–1.5%) were designed. A total of 28 concrete cube specimens cured for 7 and 28 days were tested for compressive strength (14 specimens) and split tensile strength (14 specimens), while 7 cylindrical specimens cured for 28 days were tested for impact resistance. The impact resistance of the concrete specimens was quantitatively analyzed by using impact strength (f_a) and wear rate (L_a), and the effect of dual incorporation of nano-SiO₂ and nano-CaCO₃ on the microstructure of concrete was further investigated by XRD and SEM. The experimental results indicate that the incorporation of 5.0% nano-SiO₂ and 1.5% nano-CaCO₃ improves the mechanical properties and impact resistance of concrete most significantly, and the compressive strength, split tensile strength, and impact resistance increase by around 37.80%, 35.31%, and 183.36%, respectively, compared with that of ordinary concrete. At the microscopic level, nano-SiO₂ reacts with C-H in a secondary hydration reaction to increase the number of C-S-H gels, which improves the pore structure in the matrix and favorably enhances the adhesion between aggregate and cement paste in the weakened layer, thus improving the abrasion resistance of concrete.

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