TY  - GEN
TI  - Numerical modeling of chemical degradation of concrete
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/35719/
AV  - public
A1  - Tóth, Michal
N2  - Concrete is the most common building material. New admixtures are continuously developed to improve desired traits. However, testing is expensive and many experiments take decades. Numerical modeling is a crucial tool for estimating the qualities of the concrete from accelerated experiments.
Our models simulate a two-phase flow of water and air in a porous medium (concrete), the transport of chemicals present in one or both phases, and chemical reactions that can affect porosity. The first model represents the laboratory experiment on accelerated carbonation of the concrete. The second model encompasses three scenarios from the SiTraM benchmark [Hoo+24].
The model equations form a coupled system of partial differential equations, ordinary differential equations, and algebraic equations. The system is discretized using the finite volume method. Special attention is paid to parts where the system is nonlinear or degenerate. The program is implemented in the simulation framework DUNE.
The results of this work are of numerical character. In the first model, we add a projection step into the nonlinear solver (Newton or RASPEN) to address the convergence issues caused by the strong reaction terms. In the second model, we use complementarity constraints to deal with the phase disappearance.
Y1  - 2024///
CY  - Heidelberg
ID  - heidok35719
ER  -