High performance mortar (HPM) is a very compact handmade composite which has high compressive strength and low permeability and flexibility. HPMs are used in special structures due to their great specifications. The aim of the current research is concentrated on the influence of functionalized multi-wall carbon nanotubes (MWCNTs) on the impact resistance, compressive and flexural strength of HPM. The functionalized MWCNTs are characterized by using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). FTIR analysis confirmed the presence of oxygen containing groups such as hydroxyl and carboxyl on the surface of oxidized MWCNTs. The XRD results revealed a sharp peak at around 2θ = 26° and a broad peak centered at 2θ = 43° corresponding to the (002) and (100) Bragg reflection planes, respectively. The experimental results of reinforced high performance mortar (RHPM) containing 0.1 %wt MWCNTs show that the impact resistance, compressive and flexural strength is 1400%, 25.58% and 2% higher than that of HPM without any MWCNTs. Furthermore, Scanning Electron Microscopy (SEM) test results show that the presence of MWCNTs in mortar has a significant effect on the microstructure of HPM.

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