Improved piezoresistive sensitivity and stability of CNT/cement mortar composites with low water-binder ratio

被引：186

作者：

Kim, H. K. ^{[1
]}

Park, I. S. ^{[2
]}

Lee, H. K. ^{[2
]}

机构：

[1] Chosun Univ, Sch Architecture, Kwangju 501759, South Korea

[2] Korea Adv Inst Sci & Technol, Dept Civil & Environm Engn, Taejon 305701, South Korea

来源：

COMPOSITE STRUCTURES | 2014年 / 116卷

基金：

新加坡国家研究基金会;

关键词：

Carbon nanotube (CNT); Cement composites; Piezoresistivity; Sensitivity and stability; Water-binder ratio; Moisture content; CARBON-FIBER; NANOTUBES; BLACK;

D O I：

10.1016/j.compstruct.2014.06.007

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

In previous studies by the authors, it was found that a lower water-binder ratio led to enhanced dispersion of carbon nanotube (CNT) in the cement matrix. The objective of this study was to investigate the piezoresistive sensitivity and stability of CNT/cement mortar composites with low water-binder ratio. The effect of absorbed water on the piezoresistivity of the composites was also investigated, since it strongly affects the electrical properties of the composites. The changes in the electrical resistance of composite specimens induced by external cyclic loading were measured to investigate their piezoresistive sensitivity and stability. The experimental results indicates that the stability of piezoresistivity under cyclic loading and their time-based sensitivity can be improved by decreasing the water-binder ratio of the cement composites. Moreover, the variation of piezoresistivity induced by the moisture content can be decreased by low water-binder ratio. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：713 / 719

页数：7

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