This investigation develops some important data on the mechanical properties, bond strength between concrete and steel rebar and microstructure of crude Oil-Soaked Concrete containing silica fume and Nano silica. Experiments were performed in eight mixes with different percentages of Nano silica and different water-cement ratios. Concrete samples were cured in the petrol, gas-oil, 2.5% solution of sulfuric acid and water. To conclude, considering the results, recommendations on optimization of Nano silica, silica fume and water-cement ratio for this type of concrete for use in the construction of concrete tanks holding petroleum products are offered. The result shows that Nano silica can improves various properties of the concrete in corrosive conditions.