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On the hysteresis in moisture storage and conductivity measured by the instantaneous profile method

Plagge, R., Scheffler, G., Grunewald, J., Funk, M.
2006
Journal of Building Physics, Vol. 29, No. 3, 247-259

Plagge, R., Scheffler, G., Grunewald, J., Funk, M., (2006), "On the hysteresis in moisture storage and conductivity measured by the instantaneous profile method", Journal of Building Physics, Vol. 29, No. 3, 247-259.
Abstract:
The relative humidity (or the capillary pressure) and volumetric water content can be determined at specific locations inside a porous medium by means of the proposed instantaneous profile method (IPM). The measurements are carried out with temperature and relative humidity (RH) sensors as well as with time domain reflectometry probes during the whole duration of the experiment. Thus, the IPM allows a transient measurement of the moisture retention characteristic. In addition, from the spatial and temporal distributions of moisture content and RH one may calculate the moisture conductivity as a function of moisture content and RH as well.

The adsorption and successive desorption experiments presented in this article have been performed on calcium silicate (a capillary active material). The results show a hysteretic behavior that appears to depend on the nature of the process. The moisture conductivity as function of RH shows a significant hystereses; however, the moisture conductivity in relation to the moisture content appears to be non-hysteretic.

Rudolf Plagge-Institute of Building Climatology, Dresden University of Technology, Dresden, Germany, plagge@ibk.arch.tu-dresden.de

Gregor Scheffler-Institute of Building Climatology, Dresden University of Technology, Dresden, Germany

John Grunewald-Institute of Building Climatology, Dresden University of Technology, Dresden, Germany

Max Funk-EMPA Materials Science and Technology, Duebendorf, CH, Switzerland

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Author Information and Other Publications Notes
Plagge, R.
Institute of Building Climatology, Faculty of Architecture, University of Technology, Dresden, Germany.
  1. A comparison of different techniques to quantify moisture content profiles in porous building materials
  2. A two-levelled hygrothermal material database for the numerical simulation program DELPHIN4
  3. Analysis of selected water absorption coefficient measurements
  4. Numerical and experimental investigation of coupled heat and moisture transport problems  
Scheffler, G.
     
Grunewald, J.
Technology University of Dresden, Faculty of Architecture, Institute of Building Climatology Zellescher Weg 17, 01069 Dresden
  1. A two-levelled hygrothermal material database for the numerical simulation program DELPHIN4
  2. Documentation of the Numerical Simulation Program DIM3.1, Volume 1: Theoretical Fundamentals
  3. Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures
  4. Modified cup for testing of water vapour transmission through thick, permeable materials
  5. Numerical and experimental investigation of coupled heat and moisture transport problems
  6. Position paper on material characterization and HAM model benchmarking
  7. Towards an engineering model of material characteristics for input to ham transport simulations - Part 1: an approach  
Funk, M.
     


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