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RH Testing Thick Slabs
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10-13-2012, 08:29 PM #11
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
You guys are so funny! Big Grin

The slab will be wetter the deeper you go, because it dries out the top. So if you go full depth of the reader and it is too wet, then there's no point in going deeper!

Another thing you could do is core 4" hole down a few inches, remove that concrete, then place your probe at the 40% total depth.

But you guys already know.... It isn't going to be dry.... I've tested 14" slabs that were 3 years old that weren't dry yet. Sad

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

10-14-2012, 08:19 AM #12
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
(10-13-2012, 08:29 PM)CC Solutions Wrote:  You guys are so funny! Big Grin

The slab will be wetter the deeper you go, because it dries out the top. So if you go full depth of the reader and it is too wet, then there's no point in going deeper!

Another thing you could do is core 4" hole down a few inches, remove that concrete, then place your probe at the 40% total depth.

But you guys already know.... It isn't going to be dry.... I've tested 14" slabs that were 3 years old that weren't dry yet. Sad

The standard says what it says. How wet is to wet when trying to figure out how fast it is drying, or predict it? Of course if it is 100% then your right, but still, standards are standards.

Having enourmous amounts of open space below the sensor is much like having open space above the sensor., which I believe is one reason they updated 2170.
If that were the case then I could simply test at one half and inch and save some drill bit time. Tongue

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

10-14-2012, 09:55 AM #13
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Being that slabs dry to the top, you could drill down until you hit a point that exceeds the maximum level of RH and stop there.

I'm just saying it is easy to drill to 4" and check what you have. If it is too high, it will only get higher as you drill further down.

If you want to remove the top few inches of concrete to get your sensor down 6" I can't see how that would affect a short term reading.

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

10-14-2012, 07:46 PM #14
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
Your just jealous of my idea. Dodgy

But I understand. Like testing a vct floor with adhesive bleed through. If you go down say 1 1/2 inches and it says Hi to ya, well then what else is there to say or do.

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

10-15-2012, 06:07 AM #15
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Exactly. But for accurate testing and reporting we still need to get down to that 40% mark to make our results unquestionable when scrutinized.

BTW... I have that oozing VCT glue all over my equipment and my shoes from a job we just did a week ago.... Sad

We powder it after we get the VCT off, but if you know of a better way to keep it off my shoes I'd love to hear it. Maybe I'll buy rubber boots to wear. The slip over hospital bootie things don't work so well.

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

10-17-2012, 01:07 PM #16
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
(Hope this pic attaches never tried this here before)

Wet enough for ya?

Guess it didn't work Sad

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

10-18-2012, 08:01 PM #17
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
(10-17-2012, 01:07 PM)CCR Wrote:  (Hope this pic attaches never tried this here before)

Wet enough for ya?

Guess it didn't work Sad

Email it to me and I will post it if you want.

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

10-19-2012, 05:39 AM #18
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Actually, its on my website. The shot of wet adhesive with the utility knife next to it. This moisture was so bad, one of my sensors filled up with watery adhesive between the time of placement and 72 hours later. Wish now I had taken a shot of that.

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

10-19-2012, 06:41 PM #19
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
.jpg wet adhesive.jpg Size: 33.22 KB  Downloads: 5
Yup, seen that often around here too.

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

10-23-2012, 06:16 PM #20
Rubensgt40 Concrete Moisture Coach ***
Status: Offline Posts:172 Threads:13 Joined:Oct 2011
JD is right, that the slab is only going to be worse deep down- but isn't the point of the standard to find the worst case scenario? These thick slabs clearly take a long time to dry.

Also, if you're a specialist whose job is to test slabs for flooring projects, and nothing but, you're bound to obey the letter of the standard. I'd like to see Wagner develop a nice, deep extendable sleeve. Then maybe put a little magnet on top of the reader and you can fish for it to get it out. Might be fun Smile

Our biggest problem here is the "raft" style slabs which have border areas that are 300-600mm deep while the rest of the slab in 100mm. The main areas will be dry but the deep parts are still wet.

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









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