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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。
In order to study the sensibility of carbon nanotube composites under cyclic loading, multiwalled carbon nanotubes (MWCNTs) were used as reinforcing phase and non-covalent surfactant sorption and dispersion technique to disperse the MWCNTs as uniformly as possible Preparation of carbon nanotube cement-based composites in cement paste, the influence of carbon nanotubes content, specimen size, cyclic loading and other factors on its alertness performance were analyzed. The experimental results show that the resistivity ρ of nanotube-cement-based composites exhibits reversible cyclic changes with cyclic loading, and exhibits good alertness. The optimal content of multi-walled carbon nanotubes is 0.2 %, And smaller size of the specimen showed better alertness. Therefore, carbon nanotube composites can be developed into a new type of sensor for structural health monitoring.