风积沙混凝土的气泡参数对其强度的影响

doi:10.11896/cldb.21010006

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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.

Key words： aeolian sand concrete compressive strength air void parameter pore structure grey correlation degree fractal theory

Published: 25 June 2022 Online: 2022-06-24

CLC number:

TU528

Fund:National Natural Science Foundation of China(51878239,51769025).

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	Articles by authors
	DONG Ruixin
	SHEN Xiangdong
	XUE Huijun
	LIU Qian
	WEI Lisi
	MU Ru

Cite this article:

DONG Ruixin,SHEN Xiangdong,XUE Huijun, et al. Influence of Air Void Parameters of Aeolian Sand Concrete on Its Strength[J]. Materials Reports, 2022, 36(12): 21010006-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21010006 OR http://www.mater-rep.com/EN/Y2022/V36/I12/21010006

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