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HomeKey Engineering MaterialsKey Engineering Materials Vol. 738An Engineering Heat and Mass Transport Model...

An Engineering Heat and Mass Transport Model Utilized for Concrete at Fire

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Abstract:

Mathematical models which can sufficiently describe processes proceeding in concrete during fire play an important role when assessing a load bearing capacity of concrete structures. In this paper a coupled heat and mass transport model based on principles of conservation of mass and energy is presented. A 2D computational solver using FEM was created to find three unknowns – a temperature, an amount of free water and a magnitude of pore pressure in concrete cross section during rapid heating. These variables, mutually connected through state equation, are necessary not only for determination the load bearing capacity of concrete element but also for prediction of concrete spalling. A parametric study of numerical results influenced by material properties of concrete (e.g. permeability, thermal conductivity) and initial conditions (e.g. relative humidity, temperature) is introduced and discussed in the end.

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Periodical:

Key Engineering Materials (Volume 738)

Pages:

58-68

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.738.58

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Online since:

June 2017

Authors:

Anna Matusikova*, Petra Rozehnalova, František Girgle, Vojtěch Kostiha, Petr Štěpánek

Keywords:

Concrete, Fire, Free Water, Parametric Study, Pore Pressure, Temperature

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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