Thanks for the feedback
Matthew Stuart
Structural Department
Manalapan
Extension 1283
-----Original Message-----
From: Jay Shilstone [mailto:j.s@shilstone.com]
Sent: Friday, May 25, 2007 11:58 AM
To: seaint@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@schoordepalma.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
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