Journal ArticleDOI
Numerical analysis of hygro-thermal behaviour and damage of concrete at high temperature
TLDR
In this article, a computational analysis of hygro-thermal and mechanical behavior of concrete structures at high temperature is presented, and the evaluation of thermal, hygral and mechanical performance of this material, including damage effects, needs the knowledge of the heat and mass transfer processes.Abstract:
A computational analysis of hygro-thermal and mechanical behaviour of concrete structures at high temperature is presented. The evaluation of thermal, hygral and mechanical performance of this material, including damage effects, needs the knowledge of the heat and mass transfer processes. These are simulated within the framework of a coupled model where non-linearities due to high temperatures are accounted for. The constitutive equations are discussed in some detail. The discretization of the governing equations is carried out by Finite Elements in space and Finite Differences in time. Copyright © 1999 John Wiley & Sons, Ltd.read more
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Modelling of hygro-thermal behaviour of concrete at high temperature with thermo-chemical and mechanical material degradation
TL;DR: In this article, a mathematical model for analysis of hygrothermal behavior of concrete as a multi-phase porous material at high temperatures, accounting for material deterioration, is presented, starting from macroscopic balances of mass, energy and linear momentum of single constituents.
Journal ArticleDOI
Hygro‐thermo‐chemo‐mechanical modelling of concrete at early ages and beyond. Part I: hydration and hygro‐thermal phenomena
TL;DR: In this article, a new numerical model of hygro-thermal and hydration phenomena in concrete at early ages and beyond is presented, where all changes of material properties are expressed as functions of hydration degree, and neither as maturity nor as equivalent hydration period.
Journal ArticleDOI
How do polypropylene fibers improve the spalling behavior of in-situ concrete?
TL;DR: In this paper, the authors analyzed the effect of the amount of polypropylene (PP) fibers on the spalling behavior of normal-strength in-situ concrete without and with PP-fibers (1.5 kg/m3).
Journal ArticleDOI
Modelling of heated concrete
TL;DR: In this paper, a fully coupled non-linear formulation is designed to predict the behaviour and potential for spalling, of heated concrete structures for fire and nuclear reactor applications, with emphasis placed upon the real processes occurring in concrete during heated based on tests carried out in several major laboratories around Europe as part of the wider HITECO research programme.
Journal ArticleDOI
Effects and interactions of temperature and stress-level related damage on permeability of concrete
TL;DR: Gawin et al. as mentioned in this paper investigated damage-temperature-stress level-permeability interactions in structural concrete and found that at lower than 80% of the peak stress, the variation of permeability is small and it is slightly influenced by the stress.
References
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Simulation par volumes finis des transferts couplés en milieux poreux anisotropes : séchage du bois à basse et à haute température
Patrick Perré,A. Degiovanni +1 more
TL;DR: In this paper, a code bidimensionnel de calcul des transferts couples de chaleur, de masse and de quantite de mouvement en milieu poreux is presented.
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Fully coupled analysis of heat, moisture, and air transfer in unsaturated soil
TL;DR: In this paper, a new theoretical formulation of coupled heat, moisture, and air transfer in unsaturated soil is presented, and an application of the model to an example test problem is then presented, making use of thermophysical soil parameters that have been independently established for a range of soil properties specified in the formulation.
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Macroscopic modelling of transport phenomena in porous media. 2: Applications to mass, momentum and energy transport
Jacob Bear,Yehuda Bachmat +1 more
TL;DR: In this paper, the averaging rules presented in Part 1 are employed in order to develop a general macroscopic balance equation and particular equations for mass, mass of a component, momentum and energy, all of a phase in a porous medium domain.
Journal ArticleDOI
Condensation and isothermal water transfer in cement mortar Part I — Pore size distribution, equilibrium water condensation and imbibition
TL;DR: In this article, the pore size distribution of cement mortar is studied in relation to water sorption experiments with the help of mercury intrusion and nitrogen sorption, and the importance of adsorbed water is pointed out.
Thermal properties of selected masonry unit concretes
T Z Harmathy,L W Allen +1 more
TL;DR: In this paper, an analysis of the results from the point of view of mental behavior under fire exposure is given. /AUTHOR/ /AUBURN, et al.