#Login Register
PH TESTING
  • 0 Vote(s) - 0 Average


09-02-2010, 10:04 AM #1
MINUS Newbie *
Status: Offline Posts:3 Threads:3 Joined:Sep 2010
F710 states that the slab should be tested for ph but i don't see a number of tests per sf. how many areas have to be tested and were is it stated.

09-03-2010, 08:11 AM #2
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
One ph test per moisture test is the standard. Obviously you can do more than that if you see something thats looks out of place.

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

09-20-2010, 02:26 PM #3
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
PH and moisture will go hand in hand also.

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

07-22-2013, 07:07 AM #4
hausenheimer Newbie *
Status: Offline Posts:9 Threads:1 Joined:Mar 2013
(09-20-2010, 02:26 PM)CC Solutions Wrote:  PH and moisture will go hand in hand also.

I disagree. I have seen moisture results well below failure, low 80's%, but pH be in the 12 range (newer slabs). I have seen low pH and high moisture (old slabs).

07-22-2013, 08:47 AM #5
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Moisture is what carries the alkalinity to the surface. Over time the slab surface carbonates and the pH drops.

You can grind into a dry slab and find higher alkalinity inside, but the surface will be low pH. The interior of a slab will remain at a pH of 12-13 for many years, and the moisture equilibrates to 50% - 70% RH.

If moisture is moving rapidly out of a slab, the surface will remain highly alkaline.

This alkali environment is very hard on adhesives, even epoxies. A slab with a very high internal RH has enough moisture in it to cause high alkalinity at the surface when the slab equilibrates under a moisture sensitive flooring. Slabs with low internal RH do not.

This excess moisture is what all these flooring tests are looking to identify. The pH test is a poor indicator of excess moisture, as is the CaCl test.

RH testing is the best non-destructive test available.

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

04-02-2014, 04:10 AM #6
hersitervery Newbie *
Status: Offline Posts:1 Threads:0 Joined:Mar 2014
thanks for that update..








Possibly Related Threads...
Thread / Author Replies / Views Last Post
32 Replies 51,617 Views
Last Post by hausenheimer
03-28-2013, 08:45 AM

Users browsing this thread:
1 Guest(s)