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Effect of Carbon Nanotubes’ Diameter on Freeze-Thaw Resistance of Cement Paste

Published online by Cambridge University Press:  30 April 2020

Wei Tian  and
Fangfang Gao Open the ORCID record for Fangfang Gao [Opens in a new window]
Wei Tian
Affiliation:
School of Civil Engineering, Chang’an University, Xi’an, China
Fangfang Gao*
Affiliation:
School of Civil Engineering, Chang’an University, Xi’an, China
*
*Corresponding author (429757009@qq.com)
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Abstract

This paper aims to investigate the freeze-thaw resistance of cement-paste containing with different diameter and content of multiwalled carbon nanotubes (MWCNTs) in terms of mechanical properties and microstructure. Three groups of cement-paste with MWCNTs diameter of 10-20 nm, 20-40 nm and 40-60 nm were prepared by incorporating 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt% MWCNTs by cement weight. Experimental results showed that the addition of 0.1 wt% MWCNTs with diameters of 10–20 nm effectively improved the freeze-thaw resistance of cement-paste. In addition, microstructural analysis of these cement-paste specimens showed that MWCNTs addition increased the materials’ initial porosity, but a proper amount of MWCNTs decreased the porosity of cement-paste after freeze-thaw cycles and effectively improved the pore size distribution. MWCNTs 10–20 nm in diameter were found to be the optimal size for improving the microstructure of these MWCNTs cement-paste

Keywords

MWCNTsMechanical propertiesFreeze-thaw cyclesPore structure
Type
Research Article
Information
Journal of Mechanics , Volume 36 , Issue 4 , August 2020 , pp. 437 - 449
Copyright
Copyright © 2020 The Society of Theoretical and Applied Mechanics

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