For a wider range of possible applications of carbon reinforced concrete as a building material, the material properties are also under high temperatures important. In order to guarantee the safety of building component in case of fire, the material behaviour must be known under this exposure. Based on this question, the currently most promising material combinations up to a temperature of 600°C were investigated with regard to their tensile behaviour. In particular, the possibilities of chemi-cal investigations on the reinforcement material and their effects on the tensile strength under high temperature as well as the test setup used for the tensile test are dealt with. Finally, obtained the results are presented, discussed and classified