Abstract

Abstract: The purpose of this study is to investigate the compressive strength and workability of concrete by partial replacement of cement with nano-phase TiO 2 particles. TiO 2 nanoparticles with the average diameter of 15 nm were used with four different contents of 0.5%, 0.1%, 1.5% and 2.0% by weight. The results showed that the use of nano-TiO 2 particles up to maximum replacement level of 2.0% produces concrete with improved strength. However, the ultimate strength of concrete was gained at 1.0% of cement replacement. The workability of fresh concrete was decreased by increasing the content of TiO 2 nanoparticles. It is concluded that partial replacement of cement with nanophase TiO 2 particles improves the compressive strength of concrete but decreases its workability.