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RE: Estimating f'c beyond 28 days

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Mr. Keil:

The information I have available implies that concrete strength, under
continuously moist-cured conditions, will be 11% stronger than the 28-day
strength after 56 days and 20% stronger than the 28-day strength after 90
days (very approximate).  However, if there is not enough water to ensure
complete hydration due to dry form work, evaporation, dry subgrade,
aggregate absorption, etc. then all bets are off.  There are many factors
that change such a relationship (interrupted curing, relative humidity,
temperature, time of moist curing, method of curing...).

smk

Scott M. Kent, P.E.
Quality Manager
Wood Science & Technology Institute
6300 SW Reservoir Avenue
Corvallis, OR  97333
T: (541) 929-9784
F: (541) 929-3694
email:  scottk(--nospam--at)woodcompositesengr.com


-----Original Message-----
From: seaint-return(--nospam--at)seaint.org [mailto:seaint-return(--nospam--at)seaint.org]On
Behalf Of William Keil
Sent: Thursday, September 21, 2000 2:37 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: Estimating f'c beyond 28 days


Assuming that concrete continues to cure indefinitely under certain
circumstances.  Does anyone have a reference or a rule of thumb for
estimating the concrete compressive strength based on the 28 day strength?
So, based on a test yielding 4000 psi concrete at 28 days, what can the
estimated value at 56 days and 90 days be calculated at?

TIA,
William J. Keil, P.E.



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