I would agree with Mike's number of .6 cu ft for an 80 lb bag
I use .44 cu ft for a 60 pound bag of "bagged concrete mix" so that
would give Mike's 80 lb bag .587 cu ft.....close enough :)
So how where does the rest of the weight per yard come from?
Dan's number of .5 cu ft per 80 bag underestimates the concrete yield
"slightly" but in small batches; waste, form volume underestimation &
form "leakage" can easily eat up that margin.
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