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Re: Max. temperature for concrete[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Max. temperature for concrete
- From: "Daryl Richardson" <h.d.richardson(--nospam--at)shaw.ca>
- Date: Thu, 25 Jun 2009 13:16:41 -0600
As it happens, you were one of the named persons in my posting of 11/3/2005. I usually delete these responses after 3 or 4 weeks; but, for some reason, I decided to save that one for future use; and today an opportunity arose.
As I recall (and the older I get the more warn out my recaller becomes) sulphur melts at about 243 degrees F, so it's not the temperature that causes the deterioration in tanks within my experience; it's the difference in temperature between the inside and outside faces of the walls and floor which causes substantial bending stresses beyond the cracking stress. but, more importantly, the most destructive element is the corrosive attack of the mixture of sulphur vapor, oxygen (from the air) and water vapor that is present in the space above the liquid surface. I've seen sulphur tanks where the concrete below the liquid level still had formwork marks even after several years of use, yet above the liquid surface the concrete was corroded away beyond the reinforcing.
H. Daryl Richardson
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