Effects of Micron-Al2O3 and Nano-Al2O3 on Mechanical Properties andDurability of Cement-based Material

WU Fu-fei; DONG Shuang-kuai; ZHAO Ben-rong; LIU Chun-mei; HE Xing-xing

doi:10.11988/ckyyb.20190129

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (5) : 163-169. DOI: 10.11988/ckyyb.20190129

HYDRAULIC STRUCTURE AND MATERIAL

Effects of Micron-Al₂O₃ and Nano-Al₂O₃ on Mechanical Properties andDurability of Cement-based Material

WU Fu-fei, DONG Shuang-kuai, ZHAO Ben-rong, LIU Chun-mei, HE Xing-xing

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Abstract

By replacing cement with Al₂O₃ of 1 μm and 10 nm, respectively, cement-based materials with low water-binder ratio were prepared for researching the modification effect of micron-Al₂O₃ and nano-Al₂O₃ on the mechanical properties and durability of cement-based material. Macro-and-microscopic approaches were adopted to examine the change law of mechanical performance and durability and to analyze the modification mechanism. Results demonstrated that both micron-Al₂O₃ and nano-Al₂O₃ at a dosage of 0.5%-4.0% could enhance the mechanical performance while reducing the drying shrinkage of cement-based material. Micron-Al₂O₃ at a dosage of 0.5%-2.0% or nano-Al₂O₃ at a dosage of0.5%-4.0% could reduce the permeability coefficient; however, a 4.0% micron-Al₂O₃ would increase the permeability coefficient. The modification effect of nano-Al₂O₃ is superior to that of micron-Al₂O₃. SEM result and previous research findings prove that in the process of cement-based material’s hydration and hardening, micron-Al₂O₃and nano-Al₂O₃ ameliorate the mechanical performance and durability through size effect, filling effect and surface activity effect.

Key words

cement-based material / micron-Al₂O₃ / nano-Al₂O₃ / modification / mechanical properties / durability / mechanism

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WU Fu-fei, DONG Shuang-kuai, ZHAO Ben-rong, LIU Chun-mei, HE Xing-xing. Effects of Micron-Al₂O₃ and Nano-Al₂O₃ on Mechanical Properties andDurability of Cement-based Material[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(5): 163-169 https://doi.org/10.11988/ckyyb.20190129

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