Technique for Measuring Moisture Storage Capacity at High Moisture Levels
Publication: Journal of Materials in Civil Engineering
Volume 13, Issue 5
Abstract
Knowledge of moisture storage capacity above the hygroscopic range is essential when calculating moisture, especially when different materials are to be connected. Generally, the storage capacity is represented by water retention curves, in which suction is plotted against the moisture content. In a number of laboratories in Europe and North America, the pressure plate and pressure membrane techniques are used to measure water retention curves. There are, however, various ways of carrying out such measurements. This paper compares two different methods of presaturating the specimens before testing, namely capillary and vacuum saturation. It also examines the effect of different beddings between the specimen and the ceramic plate. It is shown, as expected, that capillary and vacuum saturated specimens give differential results. Absorption tests clearly show that, for some materials, capillary saturation is a vague concept. For this reason, vacuum saturation is generally to be preferred. In the test with different beddings, no significant differences were found.
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References
1.
Adamson, A. W. ( 1990). Physical chemistry of surfaces, 5th Ed., Wiley, New York.
2.
Bomberg, M. ( 1974). “Moisture flow through porous building materials.” Rep. No. 52, Div. of Build. Technol., Lund Institute of Technology, Lund, Sweden.
3.
Brocken, H. J. O. ( 1998). “Moisture transport in brick masonry: The grey area between bricks.” PhD thesis, Eindhoven University of Technology, Eindhoven, The Netherlands.
4.
Fagerlund, G. ( 1973a). “Determination of pore size distribution by suction porosimetry.” Mat. and Struct., Paris, 6(33), 191–201.
5.
Fagerlund, G. ( 1973b). “Determination of pore-size distribution from freezing-point depression.” Mat. and Struct., Paris, 6(33), 215–225.
6.
Fagerlund, G. ( 1977). “The critical degree of saturation method of assessing the freeze/thaw resistance of concrete.” Mat. and Struct., Paris, 10(58).
7.
Fagerlund, G. ( 1979). “Prediction of the service life of concrete exposed to frost action.” Studies on concrete technology, Swedish Cement and Concrete Research Institute, Stockholm.
8.
Fagerlund, G. ( 1993). “The long time water absorption in the air-pore structure of concrete.” Rep. No. TVBM-3051, Div. of Build. Mat., Lund Institute of Technology, Lund, Sweden.
9.
Fagerlund, G. ( 1999). “Hysteresis between pore water pressure and moisture content: Consequences of drying shrinkage and frost resistance.” Rep. No. TVBM-7138 (in Swedish).
10.
Hansen, M. H. ( 1997). “Retention curves measured using pressure plate and pressure membrane appratus: Description of methods and interlaboratory comparison.” Nordtest Tech. Rep. No. 367, SBI Rep. No. 295, Danish Building Research Institute, Hørsholm, Sweden.
11.
Hansen, M. H., Houvenagehl, G., Janz, M., Krus, M., and Strømdahl, K. ( 1999). “Interlaboratory comparison of the measurement of retention curves.”J. Thermal Envelope and Build. Sci., 22, 334–348.
12.
Janz, M. ( 1997). “Methods of measuring the moisture diffusivity at high moisture levels.” Rep. No. TVBM-3076, Div. of Build. Mat. Lund Institute of Technology, Lund, Sweden.
13.
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 (in German).
14.
Krus, M., and Kießl, K. ( 1991). “An experimental comparison between pore size distributions obtained with mercury intrusion porosimetry and pressure extractors.” Rep. No. FtB-11 Fraunhofer-Institut für Bauphysik, Holzkirchen, Germany (in German).
15.
Krus, M., and Kießl, K. ( 1998). “Determination of the moisture storage characteristics of porous capillary active materials.” Mat. and Struct., Paris, 31, 522–529.
16.
Krus, M., and Künzel, H. M. ( 1992). “Liquid water transport above capillary saturation.” Rep. No. T3-D-92/03, IEA-Annex 24 Project.
17.
Letey, J., Osborn, J., and Pelishek, R. E. ( 1962). “Measurement of liquid-solid contact angles in soil and sand.” Soil Sci., 93(3), 149–153.
18.
Nordtest Standard. ( 1997). “Retention curve and pore size distribution.” NT BUILD 481.
19.
Richards, L. A. ( 1948). “Porous plate apparatus for measuring moisture retention and transmission by soil.” Soil Sci., 66, 105–109.
20.
Schwarz, B. ( 1972). “Capillary water absorption in building materials.” Gesundheits-Ingenieur, 7(93), 206–211 (in German).
21.
Sellevold, E. J., and Bager, D. H. ( 1980). “Low temperature calorimetry as a pore structure probe.” Proc., 7th Int. Congr. on Chemistry of Cement, Vol. 4, 394–399.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 13 • Issue 5 • October 2001
Pages: 364 - 370
History
Received: Nov 1, 1999
Published online: Oct 1, 2001
Published in print: Oct 2001
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