Moisture: Difference between revisions

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Author: [[user:Hschwarz|Hans-Jürgen Schwarz]]
Author: [[user:Hschwarz|Hans-Jürgen Schwarz]]
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== Introduction==
== Introduction==


The moisture content is an important parameter for the assessment of salt and moisture damage. It should therefore always be known and should be determined.
Moisture content is an important parameter for the assessment of salt deterioration. It should therefore always be determined.


Several factors influence the water content of a material:  
Several factors influence the water content of a material:  


*The '''Materials''' themselves: Depending on the chemical composition, the porosity, the inner surfaces and their composition each material has a different capacity to absorb moisture, both form air humidity or as liquid water.
*The '''Materials''' themselves: Depending on their chemical composition, porosity, inner surface areas and texture, each material has a different capacity to sorb moisture, both from water vapor in the air (adsorption) or as liquid water (absorption).
* The '''relative humidity''': Water absoption from the air is mostly a funktion of the relative humidity. The higher the relative humidity, the more moisture is absorbed from the air.  
* The '''Relative Humidity''' of the air: The higher the relative humidity, the higher the amount of moisture adsorbed by the material.  
*'''Liquid Water Uptake''': In addition to the absorption of water from the air it can be taken up in considerable amounts in the liquid phase as rain, condensation and rising damp.
*'''Liquid Water Uptake''': The presence of capillary pores in a material induces capillarity of liquid water when the surface is wetted by rain, fog, dew or in contact with a damp body, i.e., soils in the case of a building. In general, larger amounts of liquid water can be absorbed as compared to water vapor adsorption.  


 
[[Category:Moisture Measurement]] [[Category:Schwarz,Hans-Jürgen]] [[Category:R-SLaue]] [[Category:editing]]
[[Category:Moisture Measurement]] [[Category:Hschwarz]] [[Category:R-SLaue]] [[Category:inProgress]]

Revision as of 18:44, 31 December 2014

Author: Hans-Jürgen Schwarz

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Overview of the chapters on moisture

Introduction

Moisture content is an important parameter for the assessment of salt deterioration. It should therefore always be determined.

Several factors influence the water content of a material:

  • The Materials themselves: Depending on their chemical composition, porosity, inner surface areas and texture, each material has a different capacity to sorb moisture, both from water vapor in the air (adsorption) or as liquid water (absorption).
  • The Relative Humidity of the air: The higher the relative humidity, the higher the amount of moisture adsorbed by the material.
  • Liquid Water Uptake: The presence of capillary pores in a material induces capillarity of liquid water when the surface is wetted by rain, fog, dew or in contact with a damp body, i.e., soils in the case of a building. In general, larger amounts of liquid water can be absorbed as compared to water vapor adsorption.