Effect of ultrasonication energy on engineering properties of carbon nanotube reinforced cement pastes

被引:249
作者
Zou, Bo [1 ]
Chen, Shu Jian [1 ]
Korayem, Asghar H. [1 ]
Collins, Frank [1 ]
Wang, C. M. [2 ,3 ]
Duan, Wen Hui [1 ]
机构
[1] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia
[2] Natl Univ Singapore, Engn Sci Programme, Singapore 119260, Singapore
[3] Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 119260, Singapore
基金
澳大利亚研究理事会;
关键词
RHEOLOGICAL BEHAVIOR; MICROSTRUCTURE; DISPERSION; STRENGTH; CONCRETE; SUPERPLASTICIZERS; WORKABILITY; COMPOSITES; ADMIXTURES; MECHANISMS;
D O I
10.1016/j.carbon.2014.12.094
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Carbon nanotubes (CNTs) are attractive candidates as nanofillers in reinforcing ordinary Portland cement (OPC) due to their superior mechanical properties. In this study, the engineering properties of CNT-OPC pastes were investigated with varied ultrasonication energy (UE) and CNT concentration. It was found that UE could effectively improve the aqueous dispersion of surface functionalized CNTs with the aid of a polycarboxylate-based cement admixture (PC). A PC to CNTs mass ratio of 8 is recommended for ensuring effective dispersion of CNTs and maintaining workability of CNT-OPC pastes under sufficient ultrasonication. Furthermore, the mechanical property results of the hardened pastes obtained from pre-notched beam tests revealed the existence of an optimal UE for achieving mechanically superior CNT-OPC pastes, which was found to be 50 J/mL per unit CNTs to suspensions weight ratio. The Young's modulus E, flexural strength sigma(f), and fracture energy G(F). of CNT-OPC pastes were significantly improved compared to plain OPC pastes. These results clearly demonstrate the reinforcing effect of CNTs on cement pastes because they decrease the porosity and increase crack bridging capacity of cement pastes at nanoscale level, which will be complementary to conventional microfibers in reinforcing OPC pastes. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:212 / 220
页数:9
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