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Air-void Structure Characteristics, Water Penetration Resistance and Freeze-thaw Resistance of Hardened Shotcrete
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Luping ZENG1, Shuang ZHAO1, Wei WANG1, Min QIAO1, Song MU1, Qianping RAN2, Jinxiang HONG1, Min HU1
Journal of the Chinese Ceramic Society | 2020, 48(11) : 1781 - 1790
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Journal of the Chinese Ceramic Society | 2020, 48(11): 1781-1790
• Research Articles •
Air-void Structure Characteristics, Water Penetration Resistance and Freeze-thaw Resistance of Hardened Shotcrete
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Luping ZENG1, Shuang ZHAO1, Wei WANG1, Min QIAO1, Song MU1, Qianping RAN2, Jinxiang HONG1, Min HU1
Affiliations
  • 1.State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China
  • 2.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

    • ZENG Luping (1993-), male, Master, Assistant Engineer. E-mail:

About Author:

ZENG Luping (1993-), male, Master, Assistant Engineer. E-mail:

Published: 2020-11-20 doi: 10.14062/j.issn.0454-5648.20200187
Outline
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Air-void structure characteristics, water penetration resistance and freeze-thaw resistance of hardened shotcrete with different spraying methods were evaluated. Also, the micro-characteristics of freeze-thaw damage zone in shotcrete were analyzed. The results show that circle-like and polygon-like air bubbles with the diameter of < 40 μm in shotcrete prepared with wet-mix spraying increase, which behave less independently with adjacent air bubbles, thus leading to a decreased later mechanical strength. However, shotcrete prepared with dry-mix spraying has poor mechanical strength and water penetration resistance, compared to that with wet-mix spraying, due to its high proportion of air bubbles with the diameter of > 280 μm. For 150-175 freeze-thaw times in a quick freezing method, the compressive strength loss ratio of shotcrete reaches nearly 40%-48%, which is worse than that of ordinary concrete with the similar water-cement ratio, but better than that with the similar 28-d compressive strength. The less independent air bubbles in wet-mix shotcrete connect each other due to the hydrostatic pressure under a freezing heave effect, thus leading to the microstructure damage in shotcrete with a poor freeze-thaw resistance.

sprayed molding operation  /  air-void structure characteristics  /  water penetration resistance  /  freeze-thaw resistance
曾鲁平, 赵爽, 王伟, 乔敏, 穆松, 冉千平, 洪锦祥, 胡敏. 硬化喷射混凝土的气泡结构特性、抗水渗透及抗冻性能. 硅酸盐学报, 2020 , 48 (11) : 1781 -1790 . DOI: 10.14062/j.issn.0454-5648.20200187
Luping ZENG, Shuang ZHAO, Wei WANG, Min QIAO, Song MU, Qianping RAN, Jinxiang HONG, Min HU. Air-void Structure Characteristics, Water Penetration Resistance and Freeze-thaw Resistance of Hardened Shotcrete[J]. Journal of the Chinese Ceramic Society, 2020 , 48 (11) : 1781 -1790 . DOI: 10.14062/j.issn.0454-5648.20200187
Appendix
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Year 2020 volume 48 Issue 11
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Article Info
doi: 10.14062/j.issn.0454-5648.20200187
  • Receive Date：2020-03-20
  • Online Date：2026-10-29
  • Published：2020-11-20
Article Data
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History
  • Received：2020-03-20
  • Revised：2020-05-04
Funding
Affiliations
    1.State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China
    2.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Corresponding:

WANG Wei (1987-), male, Master, Engineer. E-mail:
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Citations
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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