I've found limited data on the amount of time
concrete takes to reach nearly full compressive
The only thing I've found is a table in a PE study
guide. It gives the % of compressive strength
reached versus time.
concrete type 3days 28 days
1 100% 100%
2 80% 85%
3 190% 130%
4 50% 65%
5 65% 65%
The text defines:
type 1 - normal portland cement
type 2 - modified portland cement. Moderate
sulfate resistance. Heat rate and heat gegeration
lower than for normal portland cement
type 3 - high-early-strenght portland cement.
type 4 - low heat portland cement
type 5 - sulfate-resistant portland cement.
Now for the question. I ordered 4000 PSI concrete
which was further described to be 5 1/2 bag mix.
Which type of the above is this?
The table seems to indicate that 3 days curing
time (if the mix I got is not type 4 or 5) is
sufficient to develop 3000 PSI compressive
strength needed here.
This seems contrary to the rule of thumb I hear
that one should allow 28 days for the concrete
tower base/anchor to develop sufficient
Any other info out there? Suggestions? Advice?
Maybe there are other considerations which warant
longer drying times. I'm just itching to get the
73 de Brian/K3KO
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