%0 Journal Article
%A WU Fu-fei
%A DONG Shuang-kuai
%A ZHAO Ben-rong
%A LIU Chun-mei
%A HE Xing-xing
%T Effects of Micron-Al<sub>2</sub>O<sub>3</sub> and Nano-Al<sub>2</sub>O<sub>3</sub> on Mechanical Properties andDurability of Cement-based Material
%D 2020
%R 10.11988/ckyyb.20190129
%J Journal of Yangtze River Scientific Research Institute
%P 163-169
%V 37
%N 5
%X By replacing cement with Al<sub>2</sub>O<sub>3</sub> of 1 μm and 10 nm, respectively, cement-based materials with low water-binder ratio were prepared for researching the modification effect of micron-Al<sub>2</sub>O<sub>3</sub> and nano-Al<sub>2</sub>O<sub>3</sub> 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-Al<sub>2</sub>O<sub>3</sub> and nano-Al<sub>2</sub>O<sub>3</sub> at a dosage of 0.5%-4.0% could enhance the mechanical performance while reducing the drying shrinkage of cement-based material. Micron-Al<sub>2</sub>O<sub>3</sub> at a dosage of 0.5%-2.0% or nano-Al<sub>2</sub>O<sub>3</sub> at a dosage of<sub> </sub>0.5%-4.0% could reduce the permeability coefficient; however, a 4.0% micron-Al<sub>2</sub>O<sub>3</sub> would increase the permeability coefficient. The modification effect of nano-Al<sub>2</sub>O<sub>3</sub> is superior to that of micron-Al<sub>2</sub>O<sub>3</sub>. SEM result and previous research findings prove that in the process of cement-based material’s hydration and hardening, micron-Al<sub>2</sub>O<sub>3</sub><sub> </sub>and nano-Al<sub>2</sub>O<sub>3</sub> ameliorate the mechanical performance and durability through size effect, filling effect and surface activity effect.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20190129