Assessment of carbon nanotube’s bulk density property for improving flexural aspects of reinforcement steel-less concrete in construction projects-II

Carbon nanotubes are fibrous and porous materials made by regular concrete testing techniques. The influence of bulk densities of multi-walled carbon nanotubes (MWCNTs) utilized in concrete is investigated in this study. The findings reveal that specimens with a smaller bulk density range (0.04–0.06 g/cc) have reasonable mechanical behavior qualities than those with a higher bulk density range. MWCNTs are exclusively inserted in the bottom one-third of the specimen below the neutral axis, where the majority of the tensile region exists, without any joints, during flexural beam testing. The presence of CNT nano-particles enhanced pore structure by reducing matrix porosity and permeability, resulted in specimens with low chloride ion permeability. However, it was discovered that the addition of MWCNTs increased chloride ion permeability by 3.0–3.75 times above control specimens. This could be owing to the increased conductivity imparted to concrete by MWCNTs. This is demonstrated by the fact that the amount of current passed increases as the number of MWCNTs added increases. The results of morphological investigations on shattered samples of composites admixed with MWCNTs matched the results of pressure-sensitive characteristics well.