Abstract The effect and the interaction mechanism of functionalized multi-walled carbon nanotubes (MWCNTs) on C-S-H gel were studied in this paper. Fourier infrared spectroscopy, acid-base titration, Raman spectroscopy and transmission electron microscopy were utilized to analyze the pristine MWCNTs and functionalized MWCNTs, showing that the degree of graphitization of the functionalized MWCNTs reduced. And the surface of the functionalized MWCNTs was grafted with acidic functions which the content was 2.5 × 10−3 mol/g. Afterward, the MWCNTs/C-S-H composite was prepared by well-dispersing the functionalized MWCNTs and the C-S-H. The experimental results showed that for the C-S-H produced with different designed molar ratios of CaO to nanosilica (C/SD), the measured molar ratio of Ca to Si (C/SM) of the C-S-H decreased and the interlayer spacing of the C-S-H increased with the increase of the amount of the functionalized MWCNTs. When C/SD = 0.8, the polymerization degree of the C-S-H decreased and the proportion of the capillary pores increased gradually with increasing the amount of the functionalized MWCNTs. When the values of C/SD were 1.5 and 2.0, the trends the polymerization degree and the proportion of the capillary pores of C-S-H were opposite to those of C/SD = 0.8. The reasons were further analyzed based upon the above experimental results.

中文翻译：

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功能化多壁碳纳米管（MWCNTs）对CSH凝胶的影响及机理分析

摘要 本文研究了功能化多壁碳纳米管(MWCNTs)对CSH凝胶的作用及其相互作用机制。傅里叶红外光谱、酸碱滴定、拉曼光谱和透射电子显微镜被用来分析原始多壁碳纳米管和功能化多壁碳纳米管，表明功能化多壁碳纳米管的石墨化程度降低。并且官能化的多壁碳纳米管表面接枝了酸性官能团，其含量为2.5×10-3 mol/g。然后，通过将功能化的 MWCNTs 和 CSH 良好分散来制备 MWCNTs/CSH 复合材料。实验结果表明，对于不同设计的 CaO 与纳米二氧化硅摩尔比 (C/SD) 产生的 CSH，随着功能化多壁碳纳米管数量的增加，测得的 CSH 的 Ca 与 Si 摩尔比 (C/SM) 降低，CSH 的层间距增加。当 C/SD = 0.8 时，CSH 的聚合度降低，毛细孔比例随着功能化 MWCNTs 数量的增加而逐渐增加。当C/SD为1.5和2.0时，CSH的聚合度和毛细孔比例与C/SD=0.8的趋势相反。根据上述实验结果进一步分析原因。随着功能化多壁碳纳米管数量的增加，CSH的聚合度降低，毛细孔比例逐渐增加。当C/SD为1.5和2.0时，CSH的聚合度和毛细孔比例与C/SD=0.8的趋势相反。根据上述实验结果进一步分析原因。随着功能化多壁碳纳米管数量的增加，CSH的聚合度降低，毛细孔比例逐渐增加。当C/SD为1.5和2.0时，CSH的聚合度和毛细孔比例与C/SD=0.8的趋势相反。根据以上实验结果进一步分析原因。