Hygrometer

• Principle
• Application
• Advantages
• Limitations
• Test Procedures

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Advantages

The amount of free water available at any time will dictate the humidity level of the air in close contact with the concrete, and hence measurement of the relative humidity of the air in close proximity with the concrete can be used as a measure of its free water content.

This method is preferable because:

1. The humidity value obtained is universal and does not have to be related to the different materials or the size shape or type of samples.
2. It is not influenced by the composition of the concrete or any additives/chemicals present nor the presence of steel reinforcing bars in the concrete.
3. It is a non-contact measurement and is portable.
4. Temperature variations and their effects are negligible as the measurement is made within the concrete at the concrete temperature.