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Moisture Meters
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09-11-2008, 09:00 AM #1
Blake McFee Newbie *
Status: Offline Posts:10 Threads:3 Joined:Sep 2008
I have heard that a surface moisture meter is not as good a way to measure moisture in concrete as using an internal relative humidity sensor. Could someone clarify this for me?

09-12-2008, 01:28 PM #2
rthompson Industry Expert *****
Status: Offline Posts:72 Threads:0 Joined:Sep 2008
Blake,
Correct, surface moisture meters and surface testing measures the very top of the concrete. As concrete dries from the top down, the slab may be wet at the bottom while indicating dry at the surface. Once a slab is covered with a moisture sensitive flooring the slab will go into equilibrium and the moisture will increase at the surface. The use of a RH Sensor will measure the internal moisture at the apex of the drying curve, which is the point where equilibrium crosses.
Please advise any questions
Rayt

09-12-2008, 05:42 PM #3
Blake McFee Newbie *
Status: Offline Posts:10 Threads:3 Joined:Sep 2008
Thanks, and how deep should I measure to get to the equilibrium point?

Blake

09-15-2008, 04:19 PM #4
rthompson Industry Expert *****
Status: Offline Posts:72 Threads:0 Joined:Sep 2008
ASTM F-2170 recommends 40% the thickness of the slab
Rayt

10-21-2008, 11:49 AM #5
rthompson Industry Expert *****
Status: Offline Posts:72 Threads:0 Joined:Sep 2008
Blake,
About 40% the thickness of the slab. 4" slab about 1-1/2 - 1-3/4"
Rayt








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