Reinforcing bar and mesh often arrives on site with some rust on it. This is quite normal: hot-rolled bars and coil have a layer of what's called mill-scale on the surface when they leave the mill. This mill-scale provides a protective layer in the right conditions but if stored externally or if the steel has been handled, this mill-scale may be disturbed leading to light rusting.
Generally speaking, rust on your reinforcing steel isn't a problem where it's formed by fresh water and research has demonstrated that a light coating of rust may actually help to increase the bond with concrete
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Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including works like roads, bridges, canals, dams, and buildings..........