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Re: Heat resistant concrete.

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Thank you. This concrete will be used for the bottom of the firebox. Normally, there will be a steel grill that would hold the wood. The concern is the hot embers that fall through the grill on the concrete.
Farzin S. Rahbar, SE
Vice President
David C. Weiss Structural Engineer & Associates, Inc.
(818) 227-8040 Ex. 13 Fax: (818) 227-8041

-----Original Message-----
From: gregory szuladzinski <ggg(--nospam--at)>
To: Sseaint Org <seaint(--nospam--at)>
Sent: Fri, Apr 29, 2011 1:08 am
Subject: Heat resistant concrete.

I am not an expert in the field, but I know that a compressed column may fail by explosive spalling
when exposed to temp above 300 deg C. The high-strength concrete is worse than normal-strength.
The spalling is ascribed to entrapped water.
Are you saying that in a fireplace it will not do that?
The temperature will easily be above 300 deg C.
Is it the lack of stress that will prevent disintegration?
Gregory from Oz