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Effect of Mineral Admixtures on the Performance of Ceramsite Shotcrete for High Geothermal Underground Engineering.

作者信息

Yu Yongqiang, Yu Liwei, Fan Lidan, Sun Liang, Zhang Zijian

机构信息

School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China.

International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003, China.

出版信息

ACS Omega. 2022 Feb 11;7(7):5774-5781. doi: 10.1021/acsomega.1c05720. eCollection 2022 Feb 22.

DOI:10.1021/acsomega.1c05720
PMID:35224337
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8867540/
Abstract

Ceramsite concrete is used in lining structures of underground engineering in the geothermal environment. This study, by means of mixing fly ash and silica fume, aims at diminishing the adverse effects on concrete performance caused by elevated temperature in high geothermal underground engineering. Under simulated geothermal conditions (20, 40, and 60 °C, RH ≥ 90%), it was first proposed that 15 and 5 wt % cement replacements by fly ash and silica fume, respectively, were most optimal. Then, the effect of mineral admixtures on ceramsite shotcrete performance was investigated. The results show that the mixing of fly ash and silica fume could improve ceramsite shotcrete adaptability in elevated curing temperature. Particularly for silica fume, at 40 °C curing temperature, the 28-day compressive strength and splitting tensile strength increased by 12.6 and 50.9%, respectively. The improvement effect of silica fume on permeability resistance and resistance to chloride ion permeability was higher than that of fly ash. Nevertheless, the mixing of fly ash was more effective than silica fume for reducing thermal conductivity.

摘要
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/446762c04814/ao1c05720_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/f1b299081b02/ao1c05720_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/b6ce7cf0e064/ao1c05720_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/d4a1017de9bb/ao1c05720_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/0e286a72dc43/ao1c05720_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/039cd9815807/ao1c05720_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/446762c04814/ao1c05720_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/f1b299081b02/ao1c05720_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/b6ce7cf0e064/ao1c05720_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/d4a1017de9bb/ao1c05720_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/0e286a72dc43/ao1c05720_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/039cd9815807/ao1c05720_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9c3e/8867540/446762c04814/ao1c05720_0007.jpg

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