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RE: w/c ratio after concrete set

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Harold, is this statement correct?
"An unscrupulous ready mix plant could also ...use type C ash in lieu of
F..."

Roger Davis
SDS Architects, Inc
205 N. Dewey Street
Eau Claire, WI 54703
715-832-1605
rdavis(--nospam--at)sdsarch.com


-----Original Message-----
From:	Sprague, Harold O. [mailto:SpragueHO(--nospam--at)bv.com]
Sent:	Tuesday, July 18, 2000 4:52 PM
To:	seaint(--nospam--at)seaint.org
Subject:	RE: w/c ratio after concrete set

David,

Petrographic tests will give a back door method to determine apparent w/c
ratios in hardened concrete.  The best approach is sharp special inspectors.
I have had rare occasions where I have had special inspectors at the plant
and at the site to corroborate mix proportions.  It is generally not a
problem.  If a ready mix plant is predisposed to fraud, they will commit
fraud no matter what.
An unscrupulous ready mix plant could also delete Durapoz, micro-silica,
uniform graded aggregate, use type C ash in lieu of F, use ASR aggregate, or
any other number of things that could not be detected by normal field
plastic concrete tests.
A good finisher will know either immediately or within a couple of hours if
the mix was juiced (too much water) or if they used super-P.
There are several other advantages of polycarbonate high range water
reducers other than the ability to batch it at the plant.
The only thing that I know for sure is that the ability to properly batch
concrete, and do the mix submittal correctly is highly regional.  I have
worked in areas where they add air-entraining in all concrete.  It plays
hell for steel trowel finished concrete.  Some regions don't have a clue.
Some regions don't have a problem.  Chicago is one of the best areas.  I
won't get into the areas that are clueless.
Regards,
Harold Sprague


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