Implementation of a Porous Media Model for Simulating Pressure Development in Heated Concrete
When concrete is subjected to high temperature, capillary water evaporates and chemically bound water is released due to dehydration. This results in an increase of pore pressure, which is believed to be one of the mechanisms leading to spalling. Spalling of concrete is of high concern for the fire safety of concrete structures. We consider a model implemented in COMSOL® using the Weak Form interface. Most of the material properties are pressure- and temperature-dependent and described by analytical expressions fit to experimental data, only valid in a certain pressure or temperature range. Simulations of an experiment from the literature are presented. In this experiment, a concrete plate of 120 mm thickness is heated from above by a radiant heater. The specimen contains combined temperature and pressure sensors located at different depths. In addition, we compare the results with a model implemented in Cast3M.
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