Wang Baomin, Deng Shuang, Han Yu
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China.
J Nanosci Nanotechnol. 2018 Dec 1;18(12):8186-8194. doi: 10.1166/jnn.2018.16394.
Multi-walled carbon nanotubes (MWCNTs) modified by gum arabic (GA) were incorporated into cement matrix composites to investigate their effect on intrinsic properties. Their ability to disperse the surface-modified MWCNTs uniformly in the cement matrix was also assessed using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The intrinsic mechanical properties of the cement composites were investigated using Nano Indenter. Results showed that the addition of treated nanotubes significantly improved the intrinsic properties of cement matrix composites. The porosity and pore size distribution of the composites were measured using mercury intrusion porosimetry (MIP), and the results indicated that cement paste containing MWCNTs had lower porosity and a more uniform pore size distribution. The morphological structure of samples was investigated using field emission scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X ray diffraction analysis (XRD), which showed that the MWCNTs acted as bridges across cracks and voided and formed a network that transferred the load in tension.
将经阿拉伯胶（GA）改性的多壁碳纳米管（MWCNTs）掺入水泥基复合材料中，以研究它们对固有性能的影响。还使用透射电子显微镜（TEM）和能量色散光谱（EDS）评估了它们将表面改性的MWCNTs均匀分散在水泥基体中的能力。使用纳米压痕仪研究了水泥复合材料的固有力学性能。结果表明，添加经处理的纳米管显著改善了水泥基复合材料的固有性能。使用压汞法（MIP）测量了复合材料的孔隙率和孔径分布，结果表明，含有MWCNTs的水泥浆体具有较低的孔隙率和更均匀的孔径分布。使用场发射扫描电子显微镜（SEM）、热重分析（TGA）和X射线衍射分析（XRD）研究了样品的形态结构，结果表明，MWCNTs起到了跨越裂缝和空隙的桥梁作用，并形成了一个在拉伸时传递载荷的网络。
