Summary

On this examine, multi-walled nanotubes (MWCNTs) functionalized with carboxyl group are used as components with totally different morphologies of chiral, zigzag and armchair to analyze the results of three MWCNTs on the mechanical and water absorption properties of cement-based composites. Accordingly, two totally different concentrations of 0.05 and 0.1 wt.% of MWCNTs are included within the cement paste with a water-to-cement ratio of 0.4. The outcomes point out that the chiral pattern for 0.05 wt.% on the age of seven and 28 days and 0.1 wt.% at 7 days, and the armchair pattern with 0.1 wt.% on the age of 28 days have the best compressive energy. The flexural energy at 7 and 28 days present that the chiral MWCNT composite has the best improve in energy for each 0.05 and 0.1%. The rating of water absorption is chiral < zigzag < armchair < PC and armchair < chiral < zigzag < PC for 0.05 and 0.1 wt.% MWCNT at 28 days, respectively. The outcomes, thus, present that the bottom proportion of water absorption is obtained by 0.05% chiral MWCNT-COOH and 0.1% armchair MWCNT-COOH on the age of 28 days. The impact of bridging, connecting MWCNTs and hydration merchandise offered by MWCNTs-COOH, is, thus, confirmed by SEM.