This book is intended to provide the reader with a clear and thorough presentation of the effect of localized corrosion on the structural behaviour of the concrete elements from both experimental and theoretical prospectives. Medium scale reinforced concrete beams were tested under different bond lengths, different steel corrosion severities, and different repair techniques. However, a mathematical model was provided to predict the behaviour of the tested specimens. The finding of this study provide useful information for design engineers and contractors because they offer a basis for decision making in terms of the selecting of the appropriate repair strategy and materials for such a deterioration case.