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Fabrication and fracture toughness properties of carbon nanotube-reinforced cement composite

Published online by Cambridge University Press:  22 February 2011

J. L. Luo ,
Z. Duan ,
G. Xian ,
Q. Li  and
T. Zhao
J. L. Luo*
Affiliation:
School of Civil Engineering, Qingdao Technological University, Qingdao, 266033, P.R. China
Z. Duan
Affiliation:
Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, P.R. China
G. Xian
Affiliation:
School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, P.R. China
Q. Li
Affiliation:
School of Civil Engineering, Qingdao Technological University, Qingdao, 266033, P.R. China
T. Zhao
Affiliation:
School of Civil Engineering, Qingdao Technological University, Qingdao, 266033, P.R. China
*
[email protected]
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Abstract

Multi-walled carbon nanotube (MWNT) reinforced cement composites (MWFRCs) were prepared with surfactant dispersion,ultrasonic treatment, and subsequently high-speed shear mixing processes. These MWFRCs were characterized in the fracturetoughness property with single edge notch bend method. As found, the addition of nanotubes improves the stress-intensityfactor (K IC ), critical crack mouth opening displacement (δ C ) and flexural strength(σ s ) of the cured nanocomposite, significantly. The maximal enhancement arrives up to 56.4%,119.4%, and 54.8%, compared to the baseline, respectively. These achievements are mainly attributed to the superiorpulling-out effect of dispersed and tough MWNT fiber upon the notched cracks. Incorporation of acid-treated MWNT balances the σ s , K IC , and δ C values. Additional nanophase carbon black mixed intothe above MWFRC further increases the corresponding fracture toughness, while additional short carbon fiber shows a negativeeffect.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 53 , Issue 3: Focus on Telecom 2009 & JFMMA , March 2011 , 30402
Copyright
© EDP Sciences, 2011

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