Untersuchungen zur Frostbeanspruchung geneigter Oberflächen aus hochfestem Spritzbeton.

Investigations on freeze‐thaw stressing of TWIST components In the experimental building CUBE – a flagship project of carbon concrete construction –, two double‐curved components made of shotcrete are visible. There are increased demands on its appearance and especially on the quality of the exposed concrete of the building envelope. A special feature is the production technology of the shell structures made of shotcrete. Due to the special shape of the components, there are increased moisture stresses and the resulting damage potential due to frost. Computational studies show significantly higher frost loads on inclined exposed concrete surfaces compared to wall surfaces. The generally higher water content of inclined concrete surfaces means that the water contained in the pore spaces freezes at temperatures just below 0 °C. In the case of wall surfaces, the water contained is more frequently stored in very fine pores. The capillary pressure prevailing here means that ice only forms at temperatures below –20 °C. [ABSTRACT FROM AUTHOR]