Self sensing carbon nanotube (CNT) and nanofiber (CNF) cementitious composites for real time damage assessment in smart structures
Self sensing carbon nanotube (CNT) and nanofiber (CNF) cementitious composites for real time damage assessment in smart structures
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DOI：
10.1016/j.cemconcomp.2014.07.003
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发表时间：
2014-10-01
影响因子：
10.5
通讯作者：
Aza, Chrysoula A.
中科院分区：
文献类型：
--
作者：
Konsta-Gdoutos, Maria S.;Aza, Chrysoula A.
研究了分散良好的碳纳米管和碳纳米纤维增强水泥基复合材料的自感知性能。实验测定了在水泥质量分数分别为0.1wt%和0.3wt%时，分散良好的碳纳米管(CNTs)和纳米纤维(CNF)增强的w/c=0.3的水泥基纳米复合材料的电阻率，并与相同载荷下纳米纤维制备的纳米复合材料的电阻率进行了比较。结果表明，电导率测量除了是评估纳米复合材料智能性能的一个有价值的工具外，还可以在测量的电阻率值与材料在基质中的分散程度之间提供良好的相关性。碳纳米管和碳纳米纤维在不同负载下的加入均能降低复合材料的电阻，当碳纳米管含量为0.1wt%时，复合材料的电学性能较好。此外，循环压缩载荷下的电导率测量提供了对所选纳米复合材料的压阻特性的洞察。结果表明，0.1wt%碳纳米管和碳纳米纤维增强的纳米复合材料的电阻率变化较大，这表明该材料在应变传感方面具有放大的灵敏度。(C)2014爱思唯尔有限公司。保留所有权利。
The self sensing properties of cementitious composites reinforced with well dispersed carbon nanotubes and carbon nanofibers were investigated. The electrical resistance of cementitious nanocomposites with w/c = 0.3 reinforced with well dispersed carbon nanotubes (CNTs) and nanofibers (CNFs) at an amount of 0.1 wt% and 0.3 wt% of cement was experimentally determined and compared with resistivity results of nanocomposites fabricated with "as received" nanoscale fibers at the same loading. Results indicate that conductivity measurements, besides being a valuable tool in evaluating the smart properties of the nanocomposites, may provide a good correlation between the resistivity values measured and the degree of dispersion of the material in the matrix. The addition of CNTs and CNFs at different loadings was proven to induce a decrease in electrical resistance, with the nanocomposites containing 0.1 wt% CNTs yielding better electrical properties. Furthermore, conductivity measurements under cyclic compressive loading provided an insight in the piezoresistive properties of selected nanocomposites. Results confirm that nanocomposites, reinforced with 0.1 wt% CNTs and CNFs, exhibited an increased change in resistivity, which is indicative of the amplified sensitivity of the material in strain sensing. (c) 2014 Elsevier Ltd. All rights reserved.