Fractal Characteristics of Pore Structure of Aeolian Sand Pumice Concrete Subjected to Freeze-thaw Cycles

XUE Huijun; ZHENG Jianting; ZOU Chunxia; HOU Yufeng; LIU Xin

doi:10.13204/j.gyjzG21090911

Volume 52 Issue 1

Apr. 2022

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XUE Huijun, ZHENG Jianting, ZOU Chunxia, HOU Yufeng, LIU Xin. Fractal Characteristics of Pore Structure of Aeolian Sand Pumice Concrete Subjected to Freeze-thaw Cycles[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(1): 187-193,142. doi: 10.13204/j.gyjzG21090911

Citation:

XUE Huijun, ZHENG Jianting, ZOU Chunxia, HOU Yufeng, LIU Xin. Fractal Characteristics of Pore Structure of Aeolian Sand Pumice Concrete Subjected to Freeze-thaw Cycles[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(1): 187-193,142. doi: 10.13204/j.gyjzG21090911

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Fractal Characteristics of Pore Structure of Aeolian Sand Pumice Concrete Subjected to Freeze-thaw Cycles

doi: 10.13204/j.gyjzG21090911

1. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. College of Energy and Traffic Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
3. Department of Civil Engineering, Ordos Institute of Technology, Ordos 017000, China

Received Date: 2021-09-09
Available Online: 2022-04-24

Abstract

Abstract

Natural pumice stone was used as coarse aggregate, and part of river sand was replaced by desert aeolian sand as fine aggregate. Aeolian sand pumice concrete was prepared and tested for frost resistance and durability. With the help of nuclear magnetic resonance, the pore structure of pumice concrete with different replacement rates of aeolian sand under the action of freeze-thaw cycles was tested, and the relations between the pore structure of aeolian sand pumice concrete under the action of freeze-thaw cycles and the fractal dimension was revealed. The results showed that:the replacement rate of aeolian sand lower than 40% had little effect on the frost resistance of pumice concrete, but the frost resistance of pumice concrete with the replacement rate of aeolian sand 60% did not meet the design requirements; a greater proportion of large pores in the aeolian sand pumice concrete (100 nm<r ≤ 1 000 nm) could increase its frost resistance, while a greater proportion of harmful pores (r>1 000 nm) could weaken its frost resistance; the change of fractal dimension D_max could reflect the change in the proportion micropores (r ≤ 100 nm) and harmful pores (r>1 000 nm) of concrete. The research could provide theoretical support for the applications of aeolian sand pumice concrete in civil and water conservancy projects in cold regions.
- freeze-thaw cycle,
- aeolian sand,
- pumice concrete,
- nuclear magnetic resonance,
- pore structure,
- fractal dimension

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References

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