Crack resistance properties of carbon nanotube-modified concrete-Reference-Cited by-同舟云学术

Crack resistance properties of carbon nanotube-modified concrete

Published:2022-11 Issue:22 Volume:74 Page:1165-1175
ISSN:0024-9831
Container-title:Magazine of Concrete Research
language:en
Short-container-title:Magazine of Concrete Research

Author:

Lan Yingjia¹,Zheng Bingmiao¹,Shi Tao²^ORCID,Ma Chengchang³,Liu Yanming⁴,Zhao Zhifang⁵

Affiliation:

1. Postgraduate, College of Civil Engineering, Zhejiang University of Technology, Hangzhou, China

2. Professor, College of Civil Engineering, Zhejiang University of Technology, Hangzhou, China; Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou, China (corresponding author: )

3. Associate Professor, College of Civil Engineering, Zhejiang University of Technology, Hangzhou, China

4. PhD candidate, College of Civil Engineering, Zhejiang University of Technology, Hangzhou, China

5. Professor, College of Civil Engineering, Zhejiang University of Technology, Hangzhou, China

Abstract

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.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction,Civil and Structural Engineering

Link

https://www.icevirtuallibrary.com/doi/pdf/10.1680/jmacr.21.00227

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