Crack resistance properties of carbon nanotube-modified concrete

被引：51

作者：

Lan, Yingjia ^{[1
]}

Zheng, Bingmiao ^{[1
]}

Shi, Tao ^{[1
,2
]}

Ma, Chengchang ^{[1
]}

Liu, Yanming ^{[1
]}

Zhao, Zhifang ^{[1
]}

机构：

[1] Zhejiang Univ Technol, Coll Civil Engn, Hangzhou, Peoples R China

[2] Key Lab Civil Engn Struct & Disaster Prevent & Mi, Hangzhou, Peoples R China

来源：

MAGAZINE OF CONCRETE RESEARCH | 2022年 / 74卷 / 22期

基金：

中国国家自然科学基金;

关键词：

carbon nanotubes; composite materials; concrete; crack resistance; high-performance cementitious composites; FRACTURE-TOUGHNESS; MECHANICAL-PROPERTIES; CEMENT PASTE;

D O I：

10.1680/jmacr.21.00227

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Incorporating carbon nanotubes (CNTs) into concrete can improve its fracture toughness. The crack resistance properties of reinforced concrete with CNTs were tested by ring test and three-point bending beam fracture test. The fracture parameters of reinforced concrete with CNTs were analysed by using double-K fracture parameters and the results showed that CNTs can improve the crack resistance properties. When the CNT content was 0.10 wt%, the compressive strength at 28 days and the splitting tensile strength of concrete were increased by 1.7 and 11.7%, respectively. When the CNT content was 0.15 wt%, the cracking time of concrete under semi-closed and closed conditions was extended by 42.1 and 41.2%, respectively. The initiation fracture toughness, the unstable fracture toughness and the fracture energy of concrete were increased by 31.0, 32.4 and 24.6%, respectively. It was found that CNTs delay the propagation of micro-cracks by bridging across the micro-cracks in concrete and strengthening the interfacial transition zone.

引用

页码：1165 / 1175

页数：11

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