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Computers and Concrete
  Volume 2, Number 3, June 2005 , pages 203-214

Effect of damage on permeability and hygro-thermalrnbehaviour of HPCs at elevated temperatures: Part 2. Numerical analysis
D. Gawin, C. E. Majorana, F. Pesaventornand B. A. Schrelfer

    In the Part 1 paper (Gawin, et al. 2005) some experimental results concerning micro-structuralrntests, permeability measurements and stress-strain tests of four types of High Performance Concrete, exposed to elevated temperatures (up to 700oC) are presented and discussed. On the basis of these experimental results parameters of the constitutive relationships describing influence of damage and temperature upon material intrinsic permeability at high temperature were determined. In this paper the effects of various formulations of damage-permeability coupling on results of computer simulations are analysed and compared with the results obtained by means of the previously proposed approach, that does not take into account thernthermo-chemical concrete damage directly. Numerical solutions are obtained using the recently developedrnfully coupled model of hygro-thermal and damage phenomena in concrete at elevated temperatures. Highrntemperature effects are considered by means of temperature and pressure dependence of several material parameters. Based on the mathematical model, the computer code HITECOSP was developed. Materialrnparameters of the model were measured by several European laboratories, which participated in thern?ITECO?research project. A model problem, concerning hygro-thermal behaviour and degradation of a HPC structure during fire, is solved. The influence of two different constitutive descriptions of the concrete permeability changes at high temperature, including thermo-chemical and mechanical damage effects, upon the results of computer simulations is analysed and discussed.
Key Words
    high-performance concrete; temperature; permeability; thermo-chemical degradation; finite element analysis.
D. Gawin; Department of Building Physics and Building Materials, Technical University of Lodz, Al. Politechniki 6, 90-924 Lodz, PolandrnC. E. Majorana, F. Pesavento and B. A. Schrelfer; Department of Constructions and Transportation Engineering, University of Padua, via Marzolo 9, 35131 Padua, Italy

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