Moisture: Difference between revisions

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*[[Physical Principles of Moisture]]
*[[Physical Principles of Moisture]]
** [[Physical Principles of Moisture#Equilibrium Moisture|Equilibrium Moisture]]
** [[Equilibrium Moisture]]
** [[Physical Principles of Moisture#Vapor Sorption|Vapor Sorption]]
** [[Vapor Sorption]]
** [[Physical Principles of Moisture#Water Absorption Coefficient|Water Absorption Coefficient]]
** [[Water Absorption Coefficient]]
*[[Moisture Measurement]]
*[[Moisture Measurement]]
*[[Units for Moisture Measurement]]
*[[Units for Moisture Measurement]]

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.