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R-Value for Air Entrained Concrete

R-Value for Air Entrained Concrete

R-Value for Air Entrained Concrete

(OP)
All,

I am seeing that air entrained concrete has a higher R-Value than standard poured concrete (see below). Whereas it makes sense, the difference surprises me. Is air-entrained concrete really this good at insulating?

Standard Concrete:      R = 0.8 (F*h*sqft/BTU)/in
Air Entrained Concrete: R = 3.9 (F*h*sqft/BTU)/in

If so, how much air needs to be entrained? The standard 6% +/- per volume? Is anyone aware of an actual source / experiment where this 3.9 value was determined?

MJB   
 

RE: R-Value for Air Entrained Concrete

I've seen the same numbers and am also skeptical. I can't provide any help here but I'll be watching for an answer as well.

RE: R-Value for Air Entrained Concrete

MJB315...the numbers for the air entrained concrete are about right for cellular or lightweight insulating concrete, but way too high for structural concrete.  I would not apply that value to structural concrete.

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