Milad Razaghiyan Pour - Graduate Student, Civil Engineering, Islamic Azad University, Taft Branch
Mohammad Ali Dashti Rahmat Abadi - Assistant Professor and Scientific Secretary of Yazd Islamic Azad University

In this research, the mechanical properties of concrete containing carbon black, including bending strength, which have not been seen in any research so far have been investigated. So far, this additive has not been used for filling with internal materials. Increasing resistance by working with additional carbon monoxide is one of the most recent research topics. The ability to use carbon black to improve concrete properties, including resistance, can be the cause of research. On the other hand, the reduction of environmental pollution due to reduced consumption of cement could provide a new era in the concrete industry. The present study investigates the flexural strength of concrete with carbon black additive. Five mix designs have been used for this purpose. A plan of control and four schemes containing carbon nanotube were considered in percentages of replacement of 12%, 8%, 4% and 2% by weight (relative to cement weight). Each of these five schemes for cement values was 0.40 and 0.45 and 0.5 was designed and built. The samples made in this study are considered for flexural strength, which is the flexural strength of the samples made at different ages of 7 and 28 days of concrete. The results of this study indicate that the use of carbon black for 4% by weight of cement leads to the highest bending strength in the samples.

carbon black; bending strength; optimal percentage