Combined Effect of Nanosilica and Multi-walled Carbon Nanotubes on Properties of Concrete

Abstract

This work is aimed to improve the mechanical properties of concrete with nanosilica (NS) and multi-walled carbon nanotubes (MWCNTs). The specimens such as cubes and cylinders were prepared for 1–2% nanosilica by weight of cement, and three different percentage of MWCNTs 0.005, 0.0025, 0.05% were used to study the effect of concrete with nanosilica and combination of nanosilica and MWCNTs on different properties such as compressive strength, split tensile strength, bond strength, and impact strength. Results indicated that the combination of nanosilica and MWCNTs provides better results than control specimens at all curing periods. In addition, NS 20.05% mix presents the highest improvement in compression, split tension, bond slip behavior, number of blows, and impact energy at first and final failure crack, among all of other tested mixes.