Grey Entropy Analysis on Effect of Pore Structure on Compressive Strength of Aeolian Sand Concrete After Salt-freezing
DONG Wei1,*, FU Qianwang1, SHEN Xiangdong2, XUE Huijun2, WANG Yaohong3, LI Zhiqiang4
1 College of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China 2 College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China 3 College of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 4 College of Water and Architectural Engineering, Shihezi University, Shihezi 832003, Xinjiang, China
Abstract: To investigate the influence of pore structure on the compressive strength of aeolian sand concrete in salt-freezing environment, concrete samples with different aeolian sand content were tested for their the compressive strength and nuclear magnetic resonance pore structure. At the same time, the grey entropy method was used to analyze how freeze-thaw induced characteristic parameters of pore structure impact the compressive strength of concrete after freezing. Further, a composite compressive strength model under different freeze-thaw cycles was established with pore parameters and aeolian sand contribution rate as predictors. The results show that the increase of freeze-thaw cycles results in the decrease of the compressive strength and bound fluid saturation of concrete specimens and the increase of the porosity and free fluid saturation. When the content of aeolian sand is less than 30%, the frost resistance of concrete is enhanced, and when the aeolian sand content is 20%, the compressive strength, porosity and bound fluid saturation of concrete show the best damage resistance. The grey entropy analysis reveals that the saturation of the bound fluid and the proportion of pore volume with a pore diameter of less than 10 μm have a high correlation with the compressive strength. This research has established a well-fitted composite compressive strength model with predictors of bound fluid saturation, the proportion of pore volume with a diameter of less than 10 μm, and the effective contribution rate of aeolian sand. It will provide a theoretical basis for the promotion of aeolian sand concrete in the northwest region.
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2023, Vol. 37 
