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Differential temperature effect

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Dear Gail,
Thanks for your kind answer. In order to consider these effects properly, I have ordered the ACI 307 ( Concrete chimneys ).
I hope that I can get enough information from this code about the aggregate and cement types to be used.
However, the permanent temperature will be around 200C. 300C is the exceptional temperature given by the producer.
Bulent Deveci
----- Original Message -----
Sent: Saturday, March 01, 2003 3:36 PM
Subject: Re: Differential temperature effect

As an aside to the real question:   concrete typically retains all of its strength to about 300 C (572 F).  Above this temperature,  it starts to lose strength due to the dehydration of the cement and breakdown of the aggregate.  Concrete with siliceous aggregate loses strength faster than concrete with carbonate aggregate (limestone or dolomite.)

Some concretes start to turn pink at temperatures above 300 C (one of the ways to figure out how hot the concrete got during a fire).  The reaction is thought to have something to do with ferrous salts in the paste.

Gail Kelley