Arash Sohrabi - R&D director, Deputy of Civil Engineering, Tabriz municipality, Tabriz, Iran
Samad Dehghan - Education department, Director, East Azerbaijan Engineering Organization, Tabriz, Iran
Gholamreza Andalib - Department of Water Resources Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran

In recent years, with the increase of pollution problems of cement factories and its impact on the environment, there is always a great need to achieve high-strength structural lightweight concretes using local and inexpensive materials. To be sustainable development is also done. At present, an attempt has been made to use masonry powder to improve the mechanical properties of lightweight structural concrete. For this purpose, ۱۸۰ cylindrical concrete specimens in dimensions of ۱۵ x ۳۰ with ۲۵ types of mixing designs, including powdered concrete concretes with different selected times were considered. The results of this study, which was performed by performing the above tests on samples made in ۷-day, ۲۸-day and ۹۰-day time, showed that the use of masonry powder at the rate of ۱۸% of cement weight, while reducing the weight of concrete, increased strength has been. Concrete compression was ۵۰% if microsilica was used and its compressive strength was increased by ۳۰% if microsilica was not used.

Concrete, Mel powder, Light weight, structure, Masonry