In the process of engineering design and construction, the concrete cover thickness is very critical. If the concrete cover thickness does not reach to design specifications and drawing requirements, it will be easy to cause some defects, such as surface cracks on building components and even reduce the structure strength and durability etc. In this paper, strength criteria is consider with three specimens with gradual removal of clear cover thickness (50-25-0 mm) of different grade of concrete to investigate the flexure behavior of over reinforced concrete beam. The results of laboratory investigation on removal clear concrete are present. Data presented includes load v/s deflection characteristics, crack width and stiffness when tested on 28 days.