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RH Testing Lighweight Concrete
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09-21-2009, 05:59 AM #1
JDJR Newbie *
Status: Offline Posts:5 Threads:2 Joined:Sep 2009
What are the procedures for testing Lightweight Concrete, and can you get a true reading.

09-22-2009, 03:42 PM #2
Ben Newbie *
Status: Offline Posts:5 Threads:1 Joined:Sep 2008
ASTM F2170. I don't see why you wouldn't get a true reading when following that method.

09-24-2009, 04:10 PM #3
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
What is the thickness of lightweight concrete? Anyone know? Smile

09-28-2009, 05:24 AM #4
JDJR Newbie *
Status: Offline Posts:5 Threads:2 Joined:Sep 2009
The thickness is 6"

12-16-2009, 12:05 PM #5
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Lightweight is scary! The aggregate is very porous and as such holds a great amount of water. Drying time for lightweight concrete can be 300% longer than standard concrete. I'd figure 3 months per inch of thickness and go from there.

I had a job that was on 11" of lightweight and I had MVER readings of 3lbs - 4lbs, with RH readings of 96%. The floor failed after the first year (that's when I was called in) and we ended up coating the floor with a Moisture Mitigation System.

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








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