As a result of the presence of moisture, water leakage and acids, this affects the concrete and the steel reinforcement. Thus, it might create cracks and steel rust and, in some cases, (if not repaired), reinforcement will reach to complete corrosion, which cause sudden collapse of the structural elements.  It is necessary not to ignore such cases, and find the drastic remedy.  Concrete and reinforcement technique can be applied through a specific technical method where damaged portions are rehabilitated. This section cannot be identified as with one case, each structural elements and problem vary regarding repair volume and rectification, some methods like enlargement structural element sections, concrete patching, epoxy injection, and etc as applicable technically to attain drastic repair and rehabilitation.