Experimental investigation on the contribution of pristine multi-walled carbon nanotubes (MWCNTs) addition to the strength enhancement of cement composites

Abstract

This research discusses the different dosages of pristine carbon nanotubes added to the strength enhancement of cement composites. Carbon nanotubes (CNTs) dispersion in the cement composite was aided using silica fume particles. Dispersion of CNTs within the cement matrix is confirmed by FESEM analysis. Addition of silica fume was found to be helpful in strength increment by improving the bond between the nanotubes and cement matrix. The experimental results showed an increase in compressive strength up to 4.2% and 19% at 7 and 28 days testing for the MWCNTs dosage of 0.10% (by weight of binder) compared to the reference specimen. This strength increment is due to improved microstructure formed by the addition of nanotubes.