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RH Testing Thick Slabs
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09-24-2012, 06:21 PM #1
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Anyone have suggestions for testing an 18" thick slab using the Wagner Reader?

With a 40% depth of 7.2", I'm afraid the reader will be diffucult if not impossible to remove. Slab was installed over Sega vapor barrier, but it will probably never dry in my lifetime, or my son's, or grandson's.

I wonder if I even need to set the sensors that deep. Wonder if the length of the reader less 1/4" to grab onto would suffice?

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

09-25-2012, 09:25 AM #2
eaadams Concrete Moisture Expert *****
Status: Offline Posts:591 Threads:85 Joined:Jul 2010
I have no idea but this begs the question what sort of building has a 18" slab and needs resilient flooring?

for my own edification please

09-25-2012, 10:03 AM #3
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
It's a testing lab clean room at a university where there will be heavy equipment moved over the surface causing a significant amount of vibration. Because of this, it had to follow very specific engineering specs for thickness, placement over a thick sand bed, vapor barrier Smile, and isolation from adjoining slabs

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

09-25-2012, 10:06 AM #4
eaadams Concrete Moisture Expert *****
Status: Offline Posts:591 Threads:85 Joined:Jul 2010
I am not joking about this. Within 10 minutes of me doing the last post I got a call on a 14" slab. An old warehouse that had semi trucks drive in, load up and move on. So funny. JK - call wagner. Our tester says he got instructions from wagner on this 14" slab he is testing today.

09-25-2012, 10:13 AM #5
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Thanks. I'll call now!

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

10-09-2012, 07:07 PM #6
Rubensgt40 Concrete Moisture Coach ***
Status: Offline Posts:172 Threads:13 Joined:Oct 2011
Any outcome on this?

We're starting to see 600mm deep sections of slab where raft-type designs are needed for extra stability in dodgy soil. I doubt you could get a Wagner to 240mm.

Are Wagner considering any accessories which might help?

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


10-10-2012, 02:10 PM #7
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Since retrieving the Wagner reader in concrete deeper than the length of the reader is tricky, I set my sensors for the 18" slab at 5". My readings after 72 hours were all in the mid 90s. So you can pretty much figure the 40% depth of 7.2" would have been in the mid to upper 90s. ph tests confirmed the concrete was not ready for installation as those were all at 11 - 12.

Even without the thickness, the concrete was power troweled so much it was almost black. No way this slab is ever going to dry.

I will be following up with the contrator in a few days as a courtesy, as I did recommend the installation of a properly installed moisture mitigation system.

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

10-10-2012, 04:24 PM #8
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
If the top of the reader had a locking lugs cut into it to allow a tool to lock in so you could set the reader, then opposite to unlock I think you could go pretty deep.

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

10-10-2012, 04:58 PM #9
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Good idea. But if the hole isn't perfectly straight, there could be enough resistance where insertion and removal could be a little tricky.

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

10-10-2012, 07:24 PM #10
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
(10-10-2012, 04:58 PM)CCR Wrote:  Good idea. But if the hole isn't perfectly straight, there could be enough resistance where insertion and removal could be a little tricky.

Yup, but you will be able to figure that out when you try and insert the sensor. Pull out and re-drill.

Of course this will mean a new model sensor insertion tool and reader with tool, The Rapid RH 5.0 EXTRA-EXTREME. Cool

Don't thank me, just send me some new kits. I am but a poor flooring installer with needs. Heart

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








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