Minimum Air Entrainment
Minimum Air Entrainment
(OP)
Is there a minimum air entrainment requirement for concrete? I specified a 4,000 psi NO AIR mix, and the submittal I received says "4,000 NO AIR", yet an air entraining admixture is listed, and the air content listed as 0-3%.






RE: Minimum Air Entrainment
Here is an article that may be of interest
ftp://imgs.ebuild.com/woc/J00J040.pdf
www.SlideRuleEra.net
RE: Minimum Air Entrainment
The supplier probably kept the admixture on the list as an oversight or laziness. From what I understand, there is no minimum air requirement. However, the supplier may also be covering himself in case someone tests and finds a small air percentage in the delivered concrete.
The best way to find out is to ask your supplier why the admixture and "0 to 3%" language is on the mix.
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com
RE: Minimum Air Entrainment
RE: Minimum Air Entrainment
I specify no entrained air additive for interior slabs, to reduce potential delamination. I believe that is fairly commen.
RE: Minimum Air Entrainment
If you specified no air entrainment and you received a mix design submittal with air entrainment, reject the mix design. Get what you ask for, but ask for the right thing!
Entrapped air is larger and less effective for any material properties. It usually accounts for about 1 to 2 percent of the total air content, depending on the mix design and the type/duration of mixing.
RE: Minimum Air Entrainment