In this work, multi-wall carbon nanotubes (MWCNT) are added (0–0.5 wt%) into a cement matrix to improve the flexural performance of the resulting nanocomposites. Under static testing, the compressive and flexural strengths were found to increase with MWCNT content with an optimum content of 0.2% and 0.1%, respectively, before decreasing because of dispersion problems (agglomeration). But it was observed that increasing the mixing time and adding silica fume improved the MWCNT dispersion. Under fatigue testing, similar trends were obtained with respect to MWCNT content as the maximum fatigue life was observed at 0.2%. A comparison between nano-silica and MWCNT reinforced concrete is also made showing that MWCNT provides better improvement at lower content. The MWCNT reinforced cement-based composite results were well fitted using linear regressions. Finally, a morphological analysis via scanning electron microscopy (SEM) was performed to explain the results based on the micro-mechanical mechanism of MWCNT reinforced composites.

在这项工作中，将多壁碳纳米管（MWCNT）添加到水泥基质中（0–0.5 wt％），以改善所得纳米复合材料的抗弯性能。在静态测试下，发现抗压强度和抗弯强度随MWCNT含量的增加而增加，最佳含量分别为0.2％和0.1％，然后由于分散问题（聚结）而降低。但是观察到增加混合时间和添加硅粉改善了MWCNT的分散性。在疲劳测试下，就MWCNT含量而言，获得了相似的趋势，因为观察到最大疲劳寿命为0.2％。还对纳米二氧化硅和MWCNT增强混凝土进行了比较，结果表明MWCNT在较低含量下可提供更好的改进。MWCNT增强水泥基复合材料的结果通过线性回归得到很好的拟合。