Investigations of high-temperature-induced concrete spalling. The spalling phenomenon particularly affects concretes with a dense structure, such as those used for carbon-reinforced concrete. For the widespread practical application of carbon-reinforced concrete, achieving a high fire resistance class is essential. In addition to the importance of the material properties of the components concrete and reinforcement, the test methods used to determine these properties are also of particular importance. Fire tests using the standard temperature-time curve are complex and therefore unsuitable for the initial characterization of new materials or minor modifications. Here, we present a simplified, space-saving test setup to examine high-temperature-induced concrete spalling, based on the PTM (pressure temperature mass) test. The functionality of the test setup was tested using a High-Performance Concrete (HPC) specially developed for the production of carbon-reinforced concrete structures. By adding short polypropylene fibers, concrete spalling was completely prevented, and the processability required for the production of carbon reinforced concrete using the casting or lamination process was maintained through minor modifications of the concrete composition.