Moisture Diffusivity of AAC with Different Densities

Authors: Tomáš Korecký, Kamil Ďurana, Miroslava Lapková, Robert Černý

Abstract:

Method of determining of moisture diffusivity on two types of autoclaved aerated concretes with different bulk density is represented in the paper. On the specimens were measured one dimensional water transport only on liquid phase. Ever evaluation was done from moisture profiles measured in specific times by capacitance moisture meter. All values from capacitance meter were recalculated to moisture content by mass. Moisture diffusivity was determined in dependence on both moisture and temperature. The experiment temperatures were set at values 55, 65, 75 and 85°C.

Keywords: moisture diffusivity, autoclaved aerated concrete, capacitance moisture meter

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1071624

References:

[1] Saber Chemkhi, Féthi Zagrouba: Water diffusion coefficient in clay material from drying data. In: Desalination, Volume 185, Issues 1-3, 1 November 2005, Pages 491-498
[2] Pavlík, Z.: Methods for determination of moisture content of porous building materials. Habiliation lectures, CTU Building faculty, Prague 2010
[3] L. Pel, H. Brocken: Determination of moisture diffusivity in porous media using moisture concentration profiles. In: International Journal of Heat and Mass Transfer Volume 39, Issue 6, April 1996, Pages 1273-1280
[4] M.I. Nizovtsev - S.V. Stankus - A.N. Sterlyagov - V.I. Terekhov - R.A. Khairulin. Determination of moisture diffusivity in porous media using gamma-method. In International Journal of Heat and Mass Transfer. Volume 51, Issue 17 - 18, 2008, Pages 4161 - 41 67
[5] PEL L. - KETELAARS A. A. J. - ADAN O. C. G. - VAN WELL A. A. Determination of moisture diffusivity in porous media using scanning neutron radiography. In International Journal of Heat and Mass Transfer. Volume 36, Issue 5, 1993, Pages 1261-1267
[6] Ing. Semerák Petr: Moisture in porous materials - transport and measurement. Prague: CTU i Prague, 1999.
[7] O. Krischer, Die wissenschaftlichen Grundlagen der Trocknungstechnik, In Springer - Verlag, Berlin, 1963
[8] R. ČernÛ, Secondary influences on moisture transport in porous material, Habiliation work, Prague 1990
[9] Z. Pavlík - R. ČernÛ, Determination of Moisture Diffusivity as a Function of Both Moisture and Temperature, In: International Journal of Thermophysics, 2011
[10] P.J. Tumidajskia, G.W. Chana, R.F. Feldmana, G. Strathdee: A Boltzmann-Matano analysis of chloride diffusion. In: Cement and Concrete Research Volume 25, Issue 7, October 1995, Pages 1556- 1566
[11] R.ČernÛ, P. Rovnaníková, Transport processes in Concrete, In: Spon Press, London, 2002
[12] C. Matano, Jpn. J. Phys. 8, 109 (1933)
[13] Xella - technical parameters of products. URL: http://www.xella.cz/downloads/czk/product/ytongÔÇÉlambda.pdf
[vis. 2011-06-23]
[14] JERMAN M. - KO─î├ì V. - V├ØBORN├Ø J. - ─îERN├Ø R. Thermal and hygric properties of autoclaved aerated concrete. In Thermophysics 2010, Brno: University of Technology, 2010, p. 102-108. ISBN 978-80- 214-4166-8.
[15] KADET - Authorized software, Department of Material engineering and chemistry, Faculty of Civil engineering, CTU in Prague. Available on http://tpm.fsv.cvut.cz/vz/software17.php (vis. 2011-06-23)
[16] KRUIS J. - KOUDELKA T. - KREJČÍ T. Efficient computer implemnentation of coupled hydrothermo-mechanical analysis. In Mathematics and Computer Simulation, 2008
[17] JERMAN M. - KEPPERT M. - V├ØBORN├Ø J. - ─îERN├Ø R. Moisture and heat transport and storage characteristics of two commercial autoclaved aerated concretes In: Cement Wapno Beton. 2011, vol. 16/78, no. 1, p. 18-29. ISSN 1425- 8129.
[18] C. H. Tong - D. B. Lund, Effective moisture diffusivity in porous materials as a function of temperature and moisture content