Industry standard is a seven day preliminary break and a twenty eight day break. Some jobs do additional breaks at 54 days or 90 days depending on original mix design.
I would have expected higher compressive strengths also.
--- In papercreters@yahoogroups.com, Jim Elbrecht <elbrecht@...> wrote:
>
> Both good reading. PC is *way* softer than I expected. Softer
> than most woods used in construction. 260psi is softer than
> basswood. [and concrete used in footings is abt 5000psi, if I recall
> correctly]
>
> They don't say on that page how long they cured the samples. [or am I
> missing that?] 1 week, 1 month, and 1 year samples would be
> interesting.
>
> Jim
>
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