Material models for the simulation of early-age cement-based materials are nowadays applied to a wide range of engineering problems, allowing to assess the risk of cracking and the level of loading of young concrete, shotcrete, and jet-grouted soil. However, the unknown composition of the described materials still introduces uncertainties in the material description which might cause significant errors in the analysis. An adequate tool to introduce mixture variations in material models is provided by the multiscale concept, with the mixture characteristics serving as input. Moreover, processes taking place in early-age cement-based materials can be taken into account at the respective scale of observation by adapting the composition and/or the mechanical properties of the constituents. In this paper, the multiscale concept is incorporated into a thermochemomechanical material model for shotcrete. The material model is applied in the context of hybrid analyses of shotcrete tunnel shells, providing new insight into the influence of mixture variations of shotcrete on the loading of tunnel shells. Moreover, once this influence is identified, performance-oriented fine-tuning of the shotcrete mix design becomes possible.
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