Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

This study focuses on different techniques for dispersing Multi-Walled Carbon Nanotubes (MWCNTs) in cementitious materials. The impact of dispersion is observed through electrical resistivity and mechanical properties composites. Two contents (0.5 1% by mass cement) MWCNTs are investigated three were used to disperse CNTs water sonication: (i) pristine, P-CNT, (ii) functionalized carbon nanotubes classical approach (dispersive agent, D-CNT), (iii) an innovative (annealing, A-CNT). Self-sensing response the material under cyclic compressive loading measured with Wheatstone Bridge (WSB) circuit. Results showed a detrimental effect dispersive agent composites irrespective content CNTs. However, P-CNT A-CNT reduction slight. With use A-CNTs, stable saturation degree. indicates that higher than A-CNTs not required development smart structural health monitoring (SHM). test results self sensing measurements indicate poor repeatability plain mortar each cycle while, noticed specimens incorporating A-CNTs. maximum variation fractional change voltage (FCV) shown 6.3% indicating high resistance mortar, while case containing FCV 35% lower better sensitivity material.