Influence of Air Void Parameters of Aeolian Sand Concrete on Its Strength
DONG Ruixin1, SHEN Xiangdong2, XUE Huijun2, LIU Qian3, WEI Lisi2, MU Ru1
1 School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China 2 Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China 3 Civil Engineering and Architecture, Southwest University of Science and Technology,Mianyang 621010,Sichuan, China
Abstract: Aeolian sand from the Ulan Buh desert in the Inner Mongolia Autonomous Region was selected as the fine aggregate, and part of the river sand was replaced by aeolian sand with the mass fraction of 40%. The air void spacing meter and nuclear magnetic resonance technology were used to test the pore structure characteristics of the aeolian sand concrete, scanning electron microscope used to observe the micro morphology within the age of 28 d, and the influence of aeolian sand concrete air void parameters and box dimensions on its strength was explored. The results show that the air content decreases and then increases with the increase of the strength of aeolian sand concrete, and the air content is positively correlated with the specific surface area of bubbles but negatively correlated with the bubble spacing coefficient; the percentage of 10—160 μm pores in ASC20, ASC30 and ASC40 groups of aeolian sand concrete is 75.9%, 84.3% and 91.5%, respectively, and the bubbles larger than 500 μm do not exceed 5.2%; the average chord length of bubbles under the grey entropy theory has the greatest influence on the 28 d compressive strength, and the bubble spacing coefficient has the least influence; the fractal dimension of pores of aeolian sand concrete ranges from 3.514 to 4.015, the correlation coefficient R2 is greater than 0.937, and the increasing trend of fractal dimension of pore volume is more obvious in ASC40 group.
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2022, Vol. 36 
