Mahdi ZamaniSabzi - Civil Engineering & Chemical Engineering Departments of Amirkabir University
Ali Parniabaran - Semiconductor Chemistry Lab of INLC۲,
Behrang Sabrlouy kolian۲ - Semiconductor Chemistry Lab of INLC
A.A Roghanizad - Department of Civil Engineering of Ottawa University,Otawa,Canada

Concrete is by far the most important building material in the world. Worldwide, more than 10 billion tons are produced each year. Electrical infrastructures also possess a considerable proportion. Some researchers suggest a limit of aggregate replacement by weight in order to maintain the standard requirements of 5% of absorption capacity for aggregates in structural concrete. Micronised silica is a potentially available resource that was used as an aggregate replacement in this research. As a result, because of its filler characteristic it can decrease the porosity ofconcretes. Tests were carried out in order to evaluate the mechanical properties and the durability of this concrete. The main effects of Micronised silica fillers are because of their physical nature. Tests include compressive strength, electrical resistivity, and modulus of elasticity. Moreover, in order to reach constant workability, polycarboxylate base super plasticizers were used. It causes a better packing of cement granular skeleton and a larger dispersion of cement grains. Results show that the replacement of aggregate with Micronised silica in concrete not only may increase the mechanical properties of concrete but also decrease the amount of consumed aggregate in construction projects as well.

micronised silica, mechanical properties, filler, durability