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Properties of Concrete Modified by Nano-Metakaolin Under Coupled Effect of Salt Lake Brine and Dry-Wet Cycles
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Huimei ZHU, Qiqng SONG, Jun ZHANG
Journal of the Chinese Ceramic Society | 2020, 48(2) : 237 - 245
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Journal of the Chinese Ceramic Society | 2020, 48(2): 237-245
Properties of Concrete Modified by Nano-Metakaolin Under Coupled Effect of Salt Lake Brine and Dry-Wet Cycles
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Huimei ZHU, Qiqng SONG, Jun ZHANG
Affiliations
  • College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

    • ZHU Huimei (1986-), female, Ph.D., Letcturer. E-mail:

About Author:

ZHU Huimei (1986-), female, Ph.D., Letcturer. E-mail:

Published: 2020-02-20 doi: 10.14062/j.issn.0454-5648.20190261
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The influence of nano-metakaolin on the compressive strength of concrete under the coupled effect of Salt Lake brine and dry-wet cycles was investigated, and the mechanism was analyzed by mercury intrusion analysis, X-ray diffraction, infrared spectroscopy, scanning electron microscopy and energy dispersive spectroscpy. The results show that the proportion of nano-metakaolin has a great effect on the compressive strength of concrete under dry-wet cycles, and more than 2% nano-metakaolin decreases the loss rate of compressive strength. The modification mechanism is since nano-metakaolin reduces the proportion of harmful holes in concrete, improves the pore size distribution and makes the microstructure of concrete more compact. The erosion depth and intrusion amount of Cl, Na, Mg and S ions in concrete are reduced due to the presence of nano-metakaolin, thus decreasing the content of NaCl in the corrosive layer of concrete and preventing the concentration of corrosion products such as Mg(OH)2, and CaSO4·2H2O. In consequence, the damage degree of concrete modified by nano-metakaolin with the coupled effect of brine and drying-wetting cycles decreases.

nano-metakaolin  /  concrete  /  Salt Lake brine and dry-wet cycles  /  strength  /  structure  /  durability
朱绘美, 宋强, 张军. 盐卤-干湿循环耦合作用下纳米偏高岭土改性混凝土的性能. 硅酸盐学报, 2020 , 48 (2) : 237 -245 . DOI: 10.14062/j.issn.0454-5648.20190261
Huimei ZHU, Qiqng SONG, Jun ZHANG. Properties of Concrete Modified by Nano-Metakaolin Under Coupled Effect of Salt Lake Brine and Dry-Wet Cycles[J]. Journal of the Chinese Ceramic Society, 2020 , 48 (2) : 237 -245 . DOI: 10.14062/j.issn.0454-5648.20190261
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Year 2020 volume 48 Issue 2
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doi: 10.14062/j.issn.0454-5648.20190261
  • Receive Date：2019-05-09
  • Online Date：2026-10-29
  • Published：2020-02-20
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  • Received：2019-05-09
  • Revised：2019-06-11
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    College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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