Test of Four Different Experimental Methods to Determine Sorption Isotherms
Publication: Journal of Materials in Civil Engineering
Volume 14, Issue 6
Abstract
One important property of materials is their moisture fixation capacity, i.e., their ability to hold moisture at different relative humidities. The sorption isotherm is one of the main input data in moisture diffusion models, and it can also be used to evaluate properties of the microstructure. We have used four different methods to measure the sorption isotherm of sandstone and porous glass. The first method was to equilibrate samples over saturated salt solutions. The second was a sorption balance in which small material samples were weighed as they were exposed to different relative humidities. The third method was the pressure plate extractor, in which a totally wet sample was equilibrated at various overpressures, corresponding to certain relative humidities. The fourth method was a newly developed microcalorimetric technique to measure sorption isotherms. Despite the different natures of the methods, a satisfying agreement was found.
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References
Brocken, H. J. P. (1998). Moisture transport in brick masonory: The gray area between bricks, Eindhoven Univ. of Technology, Eindhoven, The Netherlands.
Janz, M. (1997). “Methods of measuring the moisture diffusivity at high moisture levels.” Rep. TVBM-3077, Lund Institute of Technology, Lund, Sweden.
Krus, M. (1995). Moisture transport and storage coefficients of porous mineral building materials: Theoretical principles and new test methods, Der Fakultät Bauingenieur und Vermessungswesen der Universität Stuttgart, Stuttgart, Germany.
Krus, M., and Kießl, K. (1991). “An experimental comparison between pore size distributions obtained with mercury porosimetry and pressure extractors.” Rep. Ftb-11, Fraunhofer-Institut für Bauphysik, Holzkirchen, Germany (in German).
Nordtest Standard. (1997). “Retention curve and pore size distribution.” NT BUILD 481.
Penner, E. (1965). “Suction and its use as measure of moisture contents and potentials in porous materials.” Humidity and Moisture, Vol. 4, Reinhold, New York.
Richards, L. A.(1948). “Porous plate apparatus for measuring moisture retention and transmission by soil.” Soil Sci., 66, 105–109.
Wadsö, I., and Wadsö, L.(1996). “A new method for determination of vapour sorption isotherms using a twin double microcalorimeter.” Thermochim. Acta, 271, 179–187.
Wadsö, I., and Wadsö, L.(1997). “A second generation twin double microcalorimeter: Measurements of sorption isotherms, heats of sorption and sorption kinetics.” J. Therm. Anal., 49, 1045–1052.
Wessman, L., and Carlsson, T. (1995). Characterization of some Swedish natural stones with thin section microscopy, Lund Institute of Technology, Lund, Sweden (in Swedish).
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Copyright © 2002 American Society of Civil Engineers.
History
Received: Nov 20, 2000
Accepted: May 22, 2001
Published online: Nov 15, 2002
Published in print: Dec 2002
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