Macroscopic and microscopic fracture features of concrete used in coal mine under chlorine salt erosion

被引：29

作者：

Li Bing ^{[1
,2
]}

Yin Huiguang ^{[2
]}

Mao Xianbiao ^{[1
,3
]}

Li Yan ^{[2
]}

Zhang Lianying ^{[2
]}

Liu Ruixue ^{[2
]}

Qiu Peitao ^{[2
]}

机构：

[1] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221008, Peoples R China

[2] Xuzhou Inst Technol, Sch Civil Engn, Xuzhou 221008, Peoples R China

[3] China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou 221008, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY | 2016年 / 26卷 / 03期

关键词：

Concrete; Chlorine salt erosion; Mesoscopic characteristic; Damage fracture;

D O I：

10.1016/j.ijmst.2016.02.014

中图分类号：

TD [矿业工程];

学科分类号：

0819 ;

摘要：

The microscopic morphology and pore structure characteristics of concrete with composite admixtures (fly ash and mineral powder) after chlorine salt erosion were analyzed via scanning electron microscopy (SEM) and mercury injection porosimetry (MIP), providing the basis for the design and maintenance of concrete shafts in coal mines. The above-mentioned characteristics were compared with the macroscopic characteristic of concrete fractures under uniaxial compression. The results show that the macroscopic fracture characteristics of concrete under uniaxial compression change from longitudinal split fracture and oblique section shear fracture to conjugate cant fracture, and the degree of breakage increases. Interface cracks, cement paste cracks, spherical surface cracks, and aggregate cracks appear in concrete under uniaxial compression. In the early stages of corrosion, the original cracks which are obvious are repaired. When the corrosion becomes more serious, cement paste cracks appear, and the number of harmful holes increases while the number of harmless holes decreases. This study also reveals the relationship between the macroscopic properties and microscopic structure of concrete under chloride salt erosion. Finally, the paper preliminarily discussed the relationship between the macroscopic properties and mesoscopic characteristics of concrete under chlorine salt erosion. (C) 2016 Published by Elsevier B.V. on behalf of China University of Mining & Technology.

引用

页码：455 / 459

页数：5

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