Crack resistance properties of carbon nanotube-modified concrete

被引:48
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
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
收藏
页码:1165 / 1175
页数:11
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