The investigation of the material behavior of high-performance concretes (HPC and UHPC) in the temperature range up to 500°C, which is interesting and relevant for many applications, is the focus of this subproject. Due to their high resistance to external chemical influences and their high strengths, high-performance concretes are particularly predestined for applications with exceptional exposures. To date, high-strength and ultra-high-strength concretes have been used almost exclusively in structural applications. However, these concretes are also interesting for use as structural building materials in the chemical industry, power plant and chimney construction, as well as for special applications in the field of mechanical engineering, where temperatures of up to 500°C and dynamic stresses can occur in parallel. This gives rise to new issues, such as the change in microstructure under permanent and/or cyclic thermal stress in the temperature range up to 500°C. It is also unknown what effects this temperature exposure has on the durability and strength of the concretes as a function of time. In addition, material developments to improve the temperature resistance of high-performance concretes while maintaining their very good durability and strength properties also need to be discussed. New solution strategies will be developed in the project, using innovative material components and/or material combinations. Furthermore, the thermally induced damage mechanisms will be investigated, which ultimately form the basis for safe and reliable designs.