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RE: Protective Coatings on Precast Concrete

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I recommend contacting Pro-Seal Products, Redmond, WA (800-349-7325)
regarding their polycarbonate penetrating sealers.  

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


> -----Original Message-----
> From: npitera(--nospam--at)mmm.com [mailto:npitera(--nospam--at)mmm.com]
> Sent: Friday, October 04, 2002 8:38 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Protective Coatings on Precast Concrete
> 
> I looking at a  multi story office building that has exposed 
> aggregate precast
> concrete  load bearing wall panels. You know, that Soviet 
> concrete look that was
> the rage in the late 60s- early 70s. Over 90 % of the wall 
> panels have cracks,
> multiple cracks. We took some core samples to the lab for 
> analysis. The concrete
> is not air entrained, and the microcracking is attributed to 
> water absorption/
> freeze -thaw cycling.
> 
> In order to solve the problem long term, I'm looking at 
> coatings/sealers. Your
> typical Silane/Siloxane sealers I'm finding out are only good 
> for 3-5 years,
> which on this building would be considered a high maintenance 
> issue, and it
> really won't bridge cracks very well. Then there are your 
> elasticmeric coatings
> which as I understand can let the building breath but are 
> only good for about 10
> years. Considering all the prep work and cost required, even 
> ten years is not
> enough.
> 
> Has anybody had any good, bad, or ugly experiences with 
> elasticmeric coatings or
> sealers?
> Any comments on this matter will be greatly appreciated.
> 
> Regards,
> 
> Nick 

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