General information on carbon fibre (C-fibre) Carbon fibre is a proven construction material in the aerospace industry. Carbon fibre's high apparent density (approximately 1700 kg/m3) and high tensile strength (approx. 3000 to 5000 N/mm2) led to interesting applications in this industry long before the fibre was introduced into civil engineering. Reinforced synthetic materials have provided an innovative impulse to aesthetic design of bearing surfaces and hybrid constructions. Carbon fibre is suitable in a variety of combinations for internal and external reinforcement of load-bearing structures. Thanks to its flexibility and favourable mechanical properties, carbon fibre is being used increasingly for strengthening of RC (reinforced concrete) structures. In a few more years, structural preservation in Europe will predominate as the share of new construction projects in the area of civil engineering falls below 50%. However, changes in utilization patterns, damaged components and errors occurring during planning and implementation phases also generate a requirement for strengthening of RC structures.