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Reinforced concrete structures are considered permanent structures. But reinforced concrete is considered a composite material where reinforcement is embedded in concrete to act as one unit. One of the issues that threatens the area of steel and the bond between concrete and reinforcement is corrosion, especially in marine environments. In marine structures, one of the most attacking materials is chlorides, which cause corrosion. The good quality of concrete has an effective influence on reducing corrosion. In this paper, 9-specimens were fabricated to evaluate the effects of the addition of Nano-Silica on the structural behavior of corroded R.C. beams. 5 concrete mixes with different ratios of Nano-Silica (0%, 1%, 1.5%, and 2% as a replacement for cement weight) were used to cast the specimens. Specimens were divided into 2 groups. Group A consisted of 4-beams that were corroded by a constant electrical current density. Also, Group B consisted of 5-beams, which were corroded by wetting and drying cycles of salty solution. The experimental results included the compressive strength of concrete, steel mass loss, ultimate capacity load, and load deflection behavior. Finally, it was noticed that Nano-Silica improved the structural properties of corroded beams. [ABSTRACT FROM AUTHOR]