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Moisture going up
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06-10-2014, 10:01 PM #1
Rubensgt40 Concrete Moisture Coach ***
Status: Offline Posts:172 Threads:13 Joined:Oct 2011
I think I know the answer - but will run it past my favourite group of online moisture geeks and gurus to create a teachable moment.

A big commercial site, not fully closed yet: Re-readings done a few weeks after initial sensor insertions showed some readings actually higher than the first readings, by up to 3%.

2 x brand new sensors were put into an area approximately 100m2, the area was sealed off with plastic sheets and dehums run for a week. Three weeks after the first readings; one sensor read the same and one was higher by 2.5%.

The surface was highly burnished and a basic bead test didn't penetrate after 60 secs.

Also, the sensor which read higher was in a beam area, but it's unknown exactly how deep the beam is (throughout the site some are 400mm some are 600, all drying from both sides). If it's 600, then I definitely don't have 20% depth, it will be approximately 12% depth. Could this make for fluctuating readings?

Either way, I'm suspecting the burnished surface is seriously preventing the slab from drying.

Thoughts?

The problem with socialism is that you soon run out of other people's money.
- Margaret Thatcher


06-11-2014, 09:04 AM #2
eaadams Concrete Moisture Expert *****
Status: Offline Posts:592 Threads:85 Joined:Jul 2010
is it enclosed & acclimated? That could explain a 2.5% variance.

Big jobs often have doors not on etc... also I just had a project that was getting sun on a probe, that F'd all the readings from that probe.

06-28-2014, 04:46 PM #3
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
Just finished an engineered glue down job where an additional ten feet of concrete was added on. New slab was slightly reflective and burnished, so I scarified it with my grinder a bit. It dropped 5 points in two weeks.
I profile all my slabs anyways so the glue sticks better, gets rid of any contaminants yata yata yata.

Stephen Perrera dba
Top Floor Installation Co.
http://www.tucsonazflooring.com
http://www.floorsavior.com

07-05-2014, 03:18 AM #4
Rubensgt40 Concrete Moisture Coach ***
Status: Offline Posts:172 Threads:13 Joined:Oct 2011
Thanks everyone. It's probably all of the above. Very open site, and the slab is just too burnished. Did some more readings last week and they've hardly moved.

The problem with socialism is that you soon run out of other people's money.
- Margaret Thatcher









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