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Experimental Determination of Heat and Moisture Transport Properties of AAC in the Range of Subzero to Room Temperatures

  • 20th Symposium on Thermophysical Properties
  • Published:
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Abstract

Thermal and hygric parameters of porous building materials are often determined as single values only. Neglecting their dependence on temperature and moisture can though lead to higher uncertainties in hygrothermal and energy-related calculations. In this paper, thermal conductivity, specific heat capacity, water vapor diffusion permeability and moisture diffusivity of autoclaved aerated concrete are measured as functions of both temperature and moisture in the ranges characteristic for their application in building structures. Experimental results show temperature as a very significant factor affecting all parameters, but its combination with moisture in different forms is even more important. The combined effects of temperature and moisture are most remarkable for thermal conductivity and moisture diffusivity, which can vary within a range of two orders of magnitude. The water vapor diffusion permeability increases with decreasing temperature despite the decreasing amount of water vapor diffused through the sample. The specific heat capacity increases continuously with both temperature and moisture.

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Acknowledgement

This research has been financially supported by the Czech Science Foundation, under project No. 17-01365S.

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Authors and Affiliations

  1. Department of Materials Engineering and Chemistry Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7/2077, Prague, Czech Republic

    Jan Kočí, Jiří Maděra, Miloš Jerman & Robert Černý

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  1. Jan Kočí
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  2. Jiří Maděra
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  3. Miloš Jerman
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  4. Robert Černý
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Correspondence to Jan Kočí.

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Selected Papers of the 20th Symposium on Thermophysical Properties.

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Kočí, J., Maděra, J., Jerman, M. et al. Experimental Determination of Heat and Moisture Transport Properties of AAC in the Range of Subzero to Room Temperatures. Int J Thermophys 40, 2 (2019). https://doi.org/10.1007/s10765-018-2464-2

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  • DOI: https://doi.org/10.1007/s10765-018-2464-2

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