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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.


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

Messages In This Thread
Moisture going up - Rubensgt40 - 06-10-2014, 10:01 PM
RE: Moisture going up - eaadams - 06-11-2014, 09:04 AM
RE: Moisture going up - Ernesto - 06-28-2014, 04:46 PM
RE: Moisture going up - Rubensgt40 - 07-05-2014, 03:18 AM

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