Moisture

<bibimport/> Author: Hans-Jürgen Schwarz

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Overview of the chapters on moisture

• Physical Principles of Moisture
  • Equilibrium Moisture
  • Vapor Sorption
  • Water Absorption Coefficient
• Moisture Measurement
• Units for Moisture Measurement

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.

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 sorb moisture, both form air humidity (adsorption) or as liquid water (absorption).
• The Relative Humidity: Water adsoption from the air is mostly a function of the relative humidity. The higher the relative humidity, the higher the amount of moisture afsorbed by the mateiral.
• Liquid Water Uptake: Materials, due to their porosity will absorb liquid water when wetted by rain, fog, dew and rising damp. In general, larger amounts of liquid water can be absorbed as compared to water vapor adsorption.