Secondary Effects on Water Vapor Transport Properties Measured by Cup Method

Authors: Z. Pavlík, J. Fořt, J. Žumár, M. Pavlíková, R. Černý

Abstract:

The cup method is applied for the measurement of water vapor transport properties of porous materials worldwide. However, in practical applications the experimental results are often used without taking into account some secondary effects which can play an important role under specific conditions. In this paper, the effect of temperature on water vapor transport properties of cellular concrete is studied, together with the influence of sample thickness. At first, the bulk density, matrix density, total open porosity and sorption and desorption isotherms are measured for material characterization purposes. Then, the steady state cup method is used for determination of water vapor transport properties, whereas the measurements are performed at several temperatures and for three different sample thicknesses.

Keywords: Water vapor transport, cellular concrete, cup method, temperature, sample thickness.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1081327

References:

[1] M. Krus, Moisture Transport and Storage Coefficients of Porous Mineral Building Materials. Theoretical Principles and New Test Methods. Fraunhofer IRB Verlag, 1996.
[2] R. Černý (ed.), Complex System of Methods for Directed Design and Assessment of Functional Properties of Building Materials: Assessment and Synthesis of Analytical Data and Construction of the System. Czech Technical University in Prague, Prague, 2010.
[3] O. Krischer, Die wissentschaftlichen Grundlagen der Trocknungstechnik. Springer Verlag, Berlin, 1963.
[4] P. Mukhopadhyaya, M. K. Kumaran, J. Lackey, “Use of the modified cup method to determine temperature dependency of water vapor transmission properties of building materials”, J. Test. Eval., vol. 33, pp. 316-322, 2005.
[5] A. Tveit, Measurements of Moisture Sorption and Moisture Permeability of Porous Materials, Norwegian Building Research Institute, Report 45. Oslo, 1966.
[6] L. Piergiovanni, P. Fava, A. Siciliano, “A Mathematical Model for the Prediction of Water Vapour Transmission Rate at Different Temperature and Relative Humidity Combinations”, Packag. Tech. Sci., vol. 8, pp. 73-83, 1995.
[7] P. W. Gibson, “Effect of temperature on water vapor transport trough polymer membrane laminates”, Polym. Test., vol. 19, pp. 673-691, 2000.
[8] R. J. Osczevski, “Water vapor transfer through a hydrophilic film at subzero temperatures”, Text. Res. J., vol. 66, 1996.
[9] D. Wildenschild, J. J. Roberts, “Experimental Tests of Enhancement of Vapor Diffusion in Topopah Spring Tuff”, J. Porous Media, vol. 4, pp. 1-13, 2001.
[10] J. R. Philip, D.A. de Vries, “Moisture movement in porous materials under temperature gradients”, Trans. Am. Geophys. Union, vol. 38, pp. 222-232, 1957.
[11] M. Pavlíková, Z. Pavlík, M. Keppert, R. Černý, “Salt transport and storage parameters of renovation plasters and their possible effects on restored buildings' walls”, Const. Build. Mat., vol. 25, pp. 1205-1212, 2011.
[12] M. Jiřičková, Application of TDR Microprobes, Mini-tensiometry, and Minihygrotmery to the Determination of Moisture Transport and Moisture Storage Parameters of Building Materials, CTU Press, Prague, 2004.
[13] D. Burnett, A. R. Garcia, M. Naderi, M. Acharya, “Vapour Sorption Properties of Building Materials Using Gravimetric Sorption Instrumentation – an Overview. Application Note 104. Surface Measurement Systems, 2009.
[14] Z. Pavlík, J. Žumár, I. Medveď, R. Černý, “Water vapor adsorption in porous building materials: experimental measurement and theoretical analysis”, Transport Porous Med., vol. 91, pp. 939-954, 2012.
[15] R. Schirmer, “Die Diffusionszahl von Wasserdampf-Luft-Gemischen und die Verdampfungsgeschwindigkeit“, Beiheft VDIZeitschrift, Verfahrenstechnik 6, pp. 170-177, 1938.