Originally Posted by
Aaron Miller
I understand that the mix can be adjusted for exceptional circumstances, but for a standard 3500 psi mix 24 hours is not long enough. Agreed?
Aaron,
Define "standard" 3500 mix".
You can order a "standard 3500 mix" which is "high early strength", 12 hours might be long enough for that.
You would need to find the mix and if it was high early strength or not (that is a "standard mix"), and, if not, and if there was nothing else in there, 24 hours 'might not be' long enough - but I'm not a an ACI concrete guy, so I don't know. All I know is that wherever I've been, "the standard" has allowed for loading block after 12 hours, probably because they are all using 'high early strength' concrete.