عنوان مقاله [English]
Self–Compacting Concrete is one of the special concretes which can pass around bars and fill all corners of molds completely without any type of segregation and no need any type of vibration. For upgrading the strength, durability and consistency of samples, it is introduced to reduce the porous rate of concretes, and for this goal using different nano materials is a significant method in special concretes for construction of important concrete projects. Nano zinc oxide is selected for this research and for comparison of the effect of nano material on mechanical properties and workability of self-compacting concrete samples. Therefor two series of samples were made, one as control samples without nano zinc oxide and other one samples containing 0.2, 0.3 and 0.5 percent of cement weight of nano zinc oxide as test samples. Slump flow test and V-funnel test used for measurement the workability of samples. The samples were cured on time of 7, 28 and 56 days in normal water and concrete laboratory temperature. Mechanical properties tests showed that using nano zinc oxide increases the rheological properties in fresh concrete and mechanical properties as well as in hardened concrete. The results showed that samples with water to cement ratio (w/c=0.40) and containing o.35 percent of nano zinc oxide of cement weight in 28 days curing time were optimum. The ratio of (f’c(7) / f’c(28)) indicated the rapid setting of the samples by using the nano zinc oxide that is an important factor in construction time.