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RE: gunite pool

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While Type V cement helps with "sulfates", it does not necessarily help with
"sulfuric acid". Sulfuric acid attack is a common cause of significant
deterioration of concrete in wastewater treatment plants - caused by release
of hydrogen sulfides which react to create concentrated sulfuric acid on
moist surfaces. Sulfate resisting cements have not been found to improve
resistance to hydrogen sulfides in wastewater. 

Generally, the best protection is an acid resistant liner to protect the
concrete surface from exposure to the acid (such as polyethylene or PVC). 


William C. Sherman, PE
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com

-----Original Message-----
From: Stanley E Scholl [mailto:sscholl2(--nospam--at)juno.com]
Sent: Wednesday, June 25, 2003 8:01 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: gunite pool


I recommend that you use Type V cement and an extra high cement content.
Also consider using polyethylene against the soil.

Stan Scholl, P.E.
Laguna Beach, CA

On Wed, 25 Jun 2003 08:16:41 -0500 "Eric Green" <EGreen(--nospam--at)walterpmoore.com>
writes:
Yes, gunite is more-or-less concrete (o.k., the coarse aggregate is
relatively small). Concrete and sulfur do not get along, much less concrete
and sulphuric acid. You need to retain a materials specialist to work with
you on this project. I suspect you will end up doing something much more
exotic than gunite against dirt. Good luck, you will need it.
 
Eric Green
- Speaking for myself and no one else/
 
-----Original Message-----
From: brian stanley [mailto:bstanley(--nospam--at)morabitoconsultants.com] 
Sent: Wednesday, June 25, 2003 7:35 AM
To: seaint(--nospam--at)seaint.org
Subject: gunite pool
 
List- 
Our office is involved in a project with a new pool complex to be built on a
site with high sulphuric acid content in the soil.  Is anyone aware of any
adverse reactions of gunite to sulphuric acid?
Brian Stanley, P.E. 
Baltimore, Md 

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