Abstract
Multi-walled carbon nanotubes (MWCNTs) were used to try and
eliminate the aggregate interfacial transition zone. Different concrete mixes were
used in fixed proportions along with varying concentrations of CNTs. The CNTs
were applied in different concentrations, namely, 0.05 wt%, 0.1 wt% and 0.2 wt%,
per dry weight. CNTs were dispersed using sonication. Concrete specimens were
tested for compressive, flexural and split-tensile strengths. For each test, thirteen
mix designs were investigated which included untreated aggregates and CNTs, and
treated aggregates and CNTs. The results were compared with the results of the
control concrete. The results showed that the use of CNTs improves the
compressive, flexural and split-tensile strengths. It was concluded that CNTs
minimize the ITZ.