Compressive strength of pile foundation concrete in permafrost environment in China

被引：15
|
作者：
Wang, Xiaoxiao [1 ,2 ]
Liu, Chang [2 ]
Liu, Shuguang [1 ,3 ]
Yan, Changwang [3 ]
Zhang, Ju [3 ]
Li, Heng [2 ]
机构：
[1] Inner Mongolia Univ Technol, Sch Mat Sci & Engn, Hohhot 010051, Peoples R China
[2] Inner Mongolia Univ Technol, Sch Civil Engn, Hohhot 010051, Peoples R China
[3] Inner Mongolia Univ Technol, Sch Min & Technol, Hohhot 010051, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 247卷
基金：
中国国家自然科学基金;
关键词：
Permafrost region; Pore icing; Pile foundation concrete; Compressive strength; MECHANICAL-PROPERTIES; LOW-TEMPERATURE; MODEL; RELAXATION; POROSITY; SYSTEM; WATER; SIZE;
D O I：
10.1016/j.conbuildmat.2020.118431
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study aimed to investigate the influence of low temperature ranging from -20 degrees C to 0 degrees C on the compressive strength and pore structure of a certain pile foundation concrete in the permafrost regions in China. This study analyzed concrete microstructure by low-temperature SEM. To quantify the influence of freezing amount, the relationship model of the compressive strength of concrete in a low-temperature environment was established based on the theory of accumulative curve of liquid saturation. Compressive strength increased with decreasing temperature. This finding was due to the gradual decrease in the pore radius of the water-ice phase transformation of concrete, and the amount of ice increased. This condition forms a complete and compact ice body and concrete bond, which gradually reduces concrete porosity. The calculated value of concrete compressive strength model established under pore icing is consistent with the experimental value. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：8
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