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RE: Gunite in High Temperature Application

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Gunite can (but may not) be the equivalent of cast in place concrete.  The
quality of a gunite (shotcrete) wall is highly dependent on the nozzleman.
Have the guy do a test panel.  Then cut up and test the test panel.

I would also look at the USACE specification section 3371 on shotcrete.
http://energy.designcommunity.com/e-design.html

Regards,
Harold Sprague
The Neenan Company


-----Original Message-----
From: Fountain Conner [mailto:fconner(--nospam--at)pcola.gulf.net]
Sent: Tuesday, October 19, 1999 3:24 PM
To: seaint(--nospam--at)seaint.org; owner-structx(--nospam--at)mLists.net
Subject: Gunite in High Temperature Application
Importance: High



I'm up against the wall here -- A 40 year-old concrete sump in hot water
service (large chemical plant) has finally sprung a couple leaks. 
Fortunately the water is treated to be slightly basic, rather than acid. 
Concrete cover on the rebar has vanished, and the rebar is exposed.  There
is slight rust, but there doesn't seem to be any significant material lost.

Of course, we're cleaning everything up before beginning repairs.

The concrete contractor says he can cap the inside of the walls (nearly 4
inches) back to the original wall profile by Sunday night.  We can get
gunite completed by Thursday evening.

Question -- Can I expect the equivalent of a 5000 psi, 28 day conventional
concrete with gunite from a local swimming pool contractor (the only man in
the area who can do the job).  If so, those 3 days are worth a lot of
money.

'Will appreciate any guidance and counsel.  We will make this decision
tomorrow.

Fountain E. Conner, P.E.
1724 Beaver Pond Rd.
Gulf Breeze, Fl. 32561
   Phone 850-932-5547
   Fax      850-934-1916