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Advances in Materials Science and Engineering
Volume 2015, Article ID 308725, 9 pages
http://dx.doi.org/10.1155/2015/308725
Research Article

The Characteristics of CNT/Cement Composites with Acid-Treated MWCNTs

1Department of Civil Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan 712-714, Republic of Korea
2Ssangyong Remicon Co., Ltd., 17-12, Goegok 4-gil, Haepyeong, Gumi 730-871, Republic of Korea

Received 24 April 2015; Revised 1 July 2015; Accepted 2 July 2015

Academic Editor: Luigi Nicolais

Copyright © 2015 Su-Tae Kang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study investigated the effects of acid-treated MWCNTs on the workability, compressive and tensile strength, porosity, and microstructure of CNT/cement composites. While workability decreased with acid treatment of CNTs, compressive and tensile strength improved significantly. Strength was also enhanced by using acid-treated CNTs alone, compared to using a surfactant with acid-treated CNTs. MIP analysis revealed that the porosity decreases from using acid-treated CNTs and that using acid-treated CNTs without a surfactant was more effective in reducing the size of micropores. A SEM analysis revealed improved CNT dispersion and dense hydration products in cement composites containing acid-treated CNTs. Ultimately, the use of acid-treated CNTs improved the CNT dispersion within CNT/cement composites, enhanced the pore structure, and formed denser hydration products around CNTs.