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Re: question: heat endurance of concrete

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Structural concrete should not be exposed to temperature above 80 degree 
Celcius IN ANY CASE. At temperature above this the cement gel bonding 
the aggregate together undergoes chemistry disturbance. High thermal 
gradient between the surface and core generate isothermal type flaking 
ultimately causing concrete failure.

Use fire/refractory bricks to contain the surface temperature of 
concrete.



RP Mehrotra
Manager (Engineering-Structural)
ENGINEERS INDIA LIMITED
New Delhi INDIA

----- Original Message -----
From: cahyo sumeru <sumeru(--nospam--at)engineer.com>
Date: Wednesday, May 9, 2001 11:33 am
Subject: question: heat endurance of concrete

> List,
> I need assistance on how far the normal concrete endurance undergoes
> continous heat of 50 to 160 centigrade (celcius) - not to exceed 300
> Fahrenheit. All the literature discuss only the fire resistance, which
> higher temperature but a short term (says 4 hours)than the case we 
> faced.Will the concrete softened after a certain period?
> any comment/ suggestion/ assistance will be most appreciated.
> 
> Regard,
> Cahyo Sumeru
> Structural Engineer
> BEE - Bandung Indonesia
> 
> 
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