碳纳米管水泥基复合材料机敏性能研究-《混凝土与水泥制品》杂志社

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碳纳米管水泥基复合材料机敏性能研究

Study on Sensing Properties of Carbon Nanotubes Reinforced Cement-based Composite Materials

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关键词：

碳纳米管；电阻率；机敏性能；循环荷载

Key words：

Multi-walled carbon nanotubes; Resistivity; Sensing properties; Cyclic loading

刊期：

２０16年第3期

DOI：

文章编号：

1000-4637（2016）03-07-06

基金项目：

碳纳米管水泥基复合材料传感器技术及重大工程防灾减灾研究（2013YD02043）

作者：

李云峰1，孙章平1，孙静1，张弛1，张涛2

单位：

1.山东省土木工程防灾减灾重点试验室（山东科技大学），青岛 266590； 2. 山东锦华建设集团有限公司，日照 276826

摘要

摘要：为了研究碳纳米管水泥基复合材料在循环荷载下的机敏性能，将多壁碳纳米管作为增强相，采用非共价表面活性剂吸附分散技术，使多壁碳纳米管尽可能均匀地分散在水泥净浆中制备碳纳米管水泥基复合材料，分析了碳纳米管掺量、试件尺寸、循环荷载等因素对其机敏性能的影响。试验结果表明：在循环荷载作用下，纳米管水泥基复合材料的电阻率ρ随着加卸载出现可逆性循环变化，表现出了良好的机敏性能，多壁碳纳米管的较佳掺量为0.2%，且尺寸较小的试件表现出的机敏性更优。因此，碳纳米管复合材料可发展成为一种新型的传感器用于结构的健康监测。

Abstract: The sensing properties of carbon nanotubes reinforced cement-based composites under cyclic loading are studied in this paper. The multi-walled carbon nanotubes was used as strengthening phase in Portland cement composites, it was dispersed using the non-covalent surfactant adsorption dispersion technology. The influence of the multi-walled carbon nanotubes content, the specimen size and the cyclic load on the carbon nanotubes reinforced cement-based composites sensing properties was measured. The experimental results show that carbon nanotubes reinforced cement-based composites resistivity show reversible cycle changes with loading and unloading, they exhibit a strong sensing properties, the better multi-walled carbon nanotubes content is 0.2% in the tests, and the smaller size specimens are better than the bigger ones. Therefore, carbon nanotubes composite materials can be developed into a new type of sensor used for structural health monitoring.

结论

（1）在循环荷载作用下，两组试件的电阻率能够随着荷载的加卸载而变化，表现出电阻率的可恢复性与可重复性。

（2）同A组试件相比较，a组试件的电阻率在每次荷载全部卸载后能够恢复到最初的大小，没有呈现出和A组试件一样的每次循环后曲线整体上移的现象，且电阻率变化幅度呈现出慢慢变大的现象，故尺寸较小的试件表现出的机敏性更优。

（3）两组试件均在碳纳米管掺量为0.2%时，在循环荷载作用下应力和电阻率关系曲线形态最好，故0.2%碳纳米管掺量的复合材料机敏性较好。

（4）掺入少量碳纳米管的水泥基复合材料表现出良好的机敏性能，因此，碳纳米管复合材料可发展成为一种新型的传感器用于结构的健康监测。

参考文献

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