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Re: Increase of f'c over time/attn: Daryl Richardson

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Daryl,

Well, there is some mix up. My signature text, due to some fault somewhere, appears at the foot of the message. This is a recent phenomena. You can find my response at the foot of this mail, which was already there in the mail that you forwarded to me; and i believe you somehow overlooked that.

Please let me have ur comments.

Regards,

SYED FAIZ AHAMD



From: Daryl Richardson <h.d.richardson(--nospam--at)shaw.ca>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: Re: Increase of f'c over time
Date: Fri, 21 Dec 2001 10:07:43 -0700

Syed,

	Your last two postings contain only the "original message" not your
posting.  I would like to see what YOU have added.

				Regards,

				H. Daryl Richardson

syed faiz ahmad wrote:
>
> >From: "Barclay, George" <GBarclay(--nospam--at)lgt.lg.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
> >Subject: Increase of f'c over time
> >Date: Thu, 20 Dec 2001 18:34:59 -0500
> >
> >Gentlemen,
> >
> >I am performing a job that involves the capacity of structural plain
> >concrete. The new (heavy equipment) demand exceeds the flexural capacity
> >of
> >the member using the original concrete strength given in the 1960
> >construction documents. The client obviously wants to avoid modification
> >of
> >the structure.  He has good reasons which I will not go into here, for
> >length of the discussion.  I know that concrete strength increases over
> >time. I spoke with one of my grad school professors from whom I originally
> >heard of this increase.  He said that he wouldn't be surprised if the
> >strength of the concrete had as much as doubled over that amount of time.
> >
> >I passed this along to my client, but tempered it with the statement that I
> >would not want to count on a doubling of strength from 3000 psi to 6000
> >psi.
> >I told him that there is a good chance that the concrete was something over > >3000 when it was originally poured. (Most of the break strengths that I've
> >seen in my 9 years are somewhat over the required f'c in the design
> >documents) I told him that this fact, plus the strength increase might get
> >us to as much as 5000 psi.  We decided to use this in the evaluation
> >calculations, but I told him that my report would state that this strength
> >would have to be documented by testing prior to his new equipment being
> >placed.
> >
> >The analysis is complete and the structure's capacity is now adequate, but > >now my client would like to see a study or some type of documentation of > >this strength increase phenomenon before he commits to the placing of the
> >new equipment to his superiors.  Does anyone know of such a documented
> >study?
> >
> >Thanks,
> >George Barclay
> >
> >
> >
> >The information contained in this e-mail message and any attachments is
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> Barclay,
>
> Well any text book on Concrete Technology would tell you concrete strengths
> do increase progressively, there is no doubt about that. If you like to
> refer, I would recommend you the following reference on the subject.
>
>       PROPERTIES OF CONCRETE
>         BY: ADAM NEVILLE
>           ELBS, LONDON.
>
> But as suggested by Bill, you should not rely on theoretical judgement
> alone. In my opinion & experience, the best way to establish in-situ
> concrete strength is by 'coring' alone; all other methods including any
> non-destructive means are misleading & not reliable.
>
> Regards,
>
> SYED FAIZ AHMAD; MENGG, MASCE
> SENIOR STRUCTURAL ENGINEER
> SAUDI OGER LTD
> RIYADH, SAUDI ARABIA.
>
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SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA

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