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Re: Joining Concrete made with different aggregate

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Mark,

Its the consistency in the concrete quality that is important & not its
constituent composition.

If the concrete properties (both for fresh & hardened concrete) remain
consistent there is no reason why there should be any problem whatsoever.

Regards,

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

From: "mark francois" <marfra(--nospam--at)opus.co.tt>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: Joining Concrete made with different aggregate
Date: Mon, 4 Feb 2002 10:48:30 -0400

We have designed a 4 storey apartment building using 5inch thick reinforced
concrete walls in both directions. The problem is that the cheaper
naturally occuring gravel for manufacturing concrete is in short supply. A
more expensive crushed stone aggregate is readily available. Concrete made
with both types of aggregate are capable of achieving the required strength
and durability.

It is therefore most economical to use concrete made from both types of
aggregates on the same building. The naturally occurring gravel is brown in
colour, rounded and with an even mixture of sizes from 1/2" to 3/4". The
crushed stone is grey, angular and more consistant in size. Is there any
structural problems in joining the different types of concrete vertically
in walls or horizontally in slabs.

thank you
mark francois




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


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