a Hadid - Assistant Professor, Faculty of Civil Engineering, University of Tabriz
k Rahmati Shadbad - M.Sc. Civil Eng., Young Researchers Club, Shabestar Branch, Islamic Azad University, Shabestar
m Rastegar Farajzadeh - M.Sc. Applied Chemistry, Center of Chemistry and Chemical Engineering of Iran

In this paper, the effects of several nanostructured materials include SiO2, TiO2, Fe2O3 and Al2O3 on the strengths and other mechanical behaviors of concrete is being reviewed. The SiO2, TiO2, Fe2O3 and Al2O3 nanopartcles can be improved on mechanical behaviors of concrete. The investigation of the concretemechanical properties is necessary to determine the feasibility of use as well as the impact on durability of structures. The presented results, clearly confirm that by adding nanoparticles to the concrete matrix can significantly increase the overall strength. Mechanical properties were tested in normal and containingnanoparticles concrete. These results were compared together by different factors. Nano-SiO2 was found to be more efficient in enhancing strength than silica fume. Addition of 10% nano-SiO2 with dispersing agents was observed to increase the compressive strength of cement mortars at 28 days by as much as 26%, compared to only a 10% increase with the addition of 15% silica fume. Nano-TiO2 can accelerate the early-age hydration of Portland cement, improve compressive and flexural. Nano-Fe2O3 has been found to provide concrete as well as to improve its compressive and flexural strengths. Also, Nano-Al2O3 has been shown to significantly increase the modulus of elasticity (up to 143% at a dosage of 5%) but to have a limited effect on the compressive strength.

Concrete Strengths, Nanostructured Materials, Nano-SiO2, Nano-TiO2