Ashkan KhodaBandehLou - Doctor of philosophy of Technical sciense, Faculty of Engineering ,Civil Engineering Department,Urmia Branch, Islamic Azad University, Urmia, Iran.
Masoud sabzchi - M.A.Student o structure, Faculty of Engineering ,Civil Engineering Department,Urmia Branch, Islamic Azad University, Urmia, Iran.

In order to be able to make nano-technology appear in the concrete industry, researchers were faced with special concrete that is different from any conventional concrete in every dimensions. This paper introduced nanotechnology, statedreasons of its usage in concrete technology with design and construction of Pozzolanicconcrete samples containing nano-silica and compares their mechanical properties such as compressive strength and tensile strength of control sample at different ages. Moreover it has reviewed the effects and properties of this material in improvingpozzolanic weaknesses which can be seen in projects using too much concrete.

nano-silica, mechanical properties, compressive strength, tensile strength