#Login Register
common problems with cacl testing
  • 0 Vote(s) - 0 Average

04-29-2009, 10:21 PM #1
Status: Offline Posts:2 Threads:1 Joined:Apr 2009
As a special inspector for an engineering firm here are some problems that my lab has had for using cacl test are as followes.
-The subject building must be acclimated at or near the temperature and relative humidity levels anticipated during occupancy or use. This is often a difficult requirement to meet on a new construction project. If the HVAC system is not operational at the time of testing a recording hygrometer should be employed to monitor and record ambient temperature and relative humidity levels for comparison to intended occupancy conditions. Significant variance between the test environment and intended use environment should cause test data to be questioned.
- Calcium chloride tests reflect moisture vapor emission from the surface of the concrete. It has been suggested that the test reflects moisture in the top 1/4 to 1/2 inch of the slab's thickness.
- If ambient environmental conditions immediately preceding testing has been extremely dry or wet, the concrete surface may be affected and test results may be skewed accordingly. Testing on an open, or breathing, concrete surface may not reflect moisture deep within or directly below the concrete slab.
-Tests are being set without floor preparation as required by ASTM F-1869. Surface contaminants and residue from paint, adhesive, curing or parting compounds can reduce vapor emission at the test site and produce inaccurate test results. Some penetrating parting compounds (tilt-up construction) or penetrating cure and seal products are difficult to detect and impossible to remove. They restrict moisture release and result in reduced vapor emission test results. It is our experience that some of these products will slowly degrade leading to latent moisture release from the concrete and eventual floor covering system failure.

Messages In This Thread
common problems with cacl testing - Trever Shiplee - 04-29-2009, 10:21 PM
RE: common problems with cacl testing - rthompson - 04-30-2009, 02:38 PM
RE: common problems with cacl testing - CC Solutions - 12-17-2009, 11:53 AM

Possibly Related Threads...
Thread / Author Replies / Views Last Post
4 Replies 14,323 Views
Last Post by Ashok Kakade
05-20-2014, 12:00 PM
13 Replies 37,144 Views
Last Post by eaadams
05-19-2014, 10:55 AM
2 Replies 12,024 Views
Last Post by eaadams
09-27-2013, 10:26 AM
33 Replies 94,772 Views
Last Post by eaadams
11-21-2012, 10:19 AM
51 Replies 158,797 Views
Last Post by ILLENTINC
11-19-2012, 11:59 AM
4 Replies 17,815 Views
Last Post by CC Solutions
09-18-2012, 06:11 PM
22 Replies 62,747 Views
Last Post by Ernesto
07-30-2012, 07:01 PM
36 Replies 115,771 Views
Last Post by CC Solutions
04-19-2011, 04:59 PM
9 Replies 34,792 Views
Last Post by CC Solutions
04-05-2011, 05:33 AM
2 Replies 15,479 Views
Last Post by DeanC
03-07-2011, 03:47 PM

Users browsing this thread:
1 Guest(s)