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RE: Concrete PH question

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Thanks for the feedback

 

Matthew Stuart

Structural Department

Manalapan

Extension 1283

 

-----Original Message-----
From: Jay Shilstone [mailto:j.s(--nospam--at)shilstone.com]
Sent: Friday, May 25, 2007 11:58 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Concrete PH question

 

This may be a case of the tail wagging the dog. You probably don't want the concrete PH to go down to 10. Reportedly, once PH goes below about 11.5, concrete loses its ability to protect reinforcing steel by passivation. You would have to go to stainless steel rebar ($$$) or other techniques.

Find a painting contractor who knows how to work with concrete.

Jay Shilstone

At 10:30 AM 5/25/2007, you wrote:

A ready mix supplier as submitted a tilt-up concrete mix that will provide a PH of about 12.5 to 13.
 
The painting sub-contractor will not warranty his work for a PH above 10.
 
Any suggestions from the tilt-up experts out there as to what admixtures or cementitious substitutes could be used to reduce the mix PH or a paint product that is not susceptible to concrete PH above 10?
 
D. Matthew Stuart, P.E., S.E., F.ASCE, SECB
Senior Project Manager
Structural
Department
Associate
Schoor DePalma Engineers and Consultants
200 State Highway
Nine
Manalapan, NJ 07726
732-577-9000 (Ext. 1283)
908-309-8657 (Cell)
732-298-9441 (Fax)
mstuart(--nospam--at)schoordepalma.com
 

James M. Shilstone, Jr., FACI                 jay2003.shilstone(--nospam--at)shilstone.com
President                                     www.shilstone.com
The Shilstone Companies, Inc.                 214-361-9681

9400 N. Central Expy., #105                   800-782-8649
Dallas, TX  75231                             FAX: 214-361-7925
If our new anti-spam filters block you, send an email to jshilstone(--nospam--at)gmail.com.

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