How do I determine the core relative humidity of hardened concrete?

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Jose Lozano

Can you be more specific in your question?

What do you mean by "core relative humidity"?

Do you mean to determine the moisture in a hardened concrete core?

THANKS

Ikotun Olumuyiwa

I mean internal moisture content

Grzegorz Knor

See for example: ASTM F2170 - 11 Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes.

There is also noninvasive method called "concrete moisture meter", but it can only detect moisture for a small depth.

To what depth