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RE: Low Concrete Quality

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Gentlemen

Silica Fume is a very fine grained pozzolanic material. like fly ash its also an industrial bye-product. You are right. It is principally used to ensure a durable concrete & now a days its almost an essential ingredient for a high strength concrete, mostly because it also acts as a water reducer. So you are able to obtain a fairly workable concrete with a low water content. And, as you know strength is inversely proportional to w/c ratio; lower the w/c ratio value, higher the strength. It is also used for all other reasons for which a pozzolanic material like fly ash is used. But mind you, its a very expensive material. And, its use to obtain a meagure 2000 or 2500 psi concrete (which can ordinarily be achieved) will not be an economically viable proposition. Regards,

SYED FAIZ AHMAD; MENGG, Mem ASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.


From: Michael Lo <Mlo(--nospam--at)EYPae.com>
Reply-To: seaint(--nospam--at)seaint.org
To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: Low Concrete Quality
Date: Mon, 18 Jun 2001 10:54:28 -0400

Just a question about the use of silica fume. Isn't silica fume an admixture
that increases durability and provides significant strength gains in
concrete?  I thought it was one of the key ingredients in high strength
concrete and would be a bit skeptical of the contractor's claim of use of
this admixture since you're getting concrete in the range of 2000-2500 psi.





Michael Lo, P.E.
Associate
Structural Department
Einhorn Yaffee Prescott - NYC
440 Park Avenue South
New York, NY 10016
Tel:(917) 981-6024
Fax:(917) 981-6100


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