Determination Of Water Vapour Permeability In Concrete Under High Moisture Conditions

1988 ◽  
Vol 137 ◽  
Author(s):  
Göran Hedenblad
Keyword(s):  
Steady State ◽  
Relative Humidity ◽  
Water Vapour ◽  
Water Vapour Permeability ◽  
New Method ◽  
High Moisture ◽  
Vapour Permeability ◽  
Moisture Permeability ◽  
Moisture Conditions

AbstractWith a new method relying on measurements of water vapour flow from a specimen and on measurements of distribution of relative humidity in the specimen at steady state conditions, it is possible to calculate the moisture permeability and to determine its dependence on the relative humidity.

Application of a Transient Method for Investigation of Water Vapour Transport Properties of Autoclaved Aerated Concrete

2015 ◽  
Vol 824 ◽  
pp. 95-99
Author(s):  
Jaromír Žumár ◽  
Zbyšek Pavlík ◽  
Robert Černý
Keyword(s):  
Relative Humidity ◽  
Water Vapour ◽  
Inverse Analysis ◽  
Water Vapour Permeability ◽  
Diffusion Experiment ◽  
Transient Method ◽  
Vapour Permeability ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Humidity Profiles

An application of a transient method for investigation of water vapour permeability of autoclaved aerated concrete is presented in the paper. Relative humidity profiles along the longitudinal axis of the rod shaped sample are measured using a transient arrangement of a diffusion experiment. Using an inverse analysis of experimentally accessed relative humidity profiles, water vapour permeability of studied material is calculated as function of relative humidity. In the inverse analysis, the Boltzmann-Matano treatment is used as the most straightforward way to the solution of inverse problems to parabolic water vapour diffusion equation.

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