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Computers and Concrete
  Volume 2, Number 3, June 2005, pages 189-202

Effect of damage on permeability and hygro-thermalrnbehaviour of HPCs at elevated temperatures: Part 1. Experimental results
D. Gawin, C. Alonso, C. Andrade, C. E. Majorana and F. Pesavento

    This paper presents an analysis of some experimental results concerning micro-structural tests,rnpermeability measurements and strain-stress tests of four types of High-Performance Concrete, exposed tornelevated temperatures (up to 700oC). These experimental results, obtained within the ?ITECO?research programme are discussed and interpreted in the context of a recently developed mathematical model of hygro-thermal behaviour and degradation of concrete at high temperature, which is briefly presented in the Part 2 paper (Gawin, et al. 2005). Correlations between concrete permeability and porosity microstructure, as well as between damage and cracks?volume, are found. An approximate decomposition of the thermally induced material damage into two parts, a chemical one related to cement dehydration process, and a thermal one due to micro-cracks?development caused by thermal strains at micro- and meso-scale, is performed. Constitutive relationships describing influence of temperature and material damage upon its intrinsic permeability at high temperature for 4 types of HPC are deduced. In the Part II of this paper (Gawin, et al. 2005) effect of two different damage-permeability coupling formulations on the results of computer simulations concerning hygro-thermo-mechanical performance of concrete wall during standard fire, is numerically analysed.
Key Words
    high-performance concrete; permeability; micro-structure; elevated temperature; micro-cracking.
D. Gawin; Department of Building Physics and Building Materials, Technical University of Lodz,rnAl. Politechniki 6, 90-924 Lodz, PolandrnC. Alonso and C. Andrade; Istituto de Ciencias de la Construccion Eduardo Torroja, CSIC, c/Serrano Galvache, s/n, 28033 Madrid, SpainrnC. E. Majorana and F. Pesavento; Department of Constructions and Transportation Engineering, University of Padua, via Marzolo 9, 35131 Padua, Italy

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