Carbon fibers (carbon fiber fabrics) are used as reinforcement in creating composite materials for repair-strengthening of structural frames. These composite materials are commonly known as Fiber Reinforced Polymers (FRP). Carbon fibers act as the reinforcing element, whilst epoxy resin is used as an adhesive material between the reinforcement and the structural frame. The end result is a material which combines very high durability with considerably low weight. Carbon fibers (carbon fiber fabrics) are used for the strengthening of concrete elements (columns, beams, slabs) as well as the strengthening of stone-frame constructions and load-bearing masonry. Their main advantages are: