Wednesday, November 11, 2009

RE: Cracking in new PS concrete parking deck

Let the City know about it.  You are a professional and have an implicit obligation as a professional. 
Double tees are tensioned with straight strands.  If it is cantilevered the strand should be harped. 

Regards, Harold Sprague


Subject: Cracking in new PS concrete parking deck
Date: Wed, 11 Nov 2009 09:53:41 -0500

I was looking at a not yet opened new parking deck and noticed a great amount of cracking in the overhangs of the double tee prestressed members.  These are not just surface crazing.  From underneath, I can see cracks already exhibiting efflorescence.  Cracking seems to always be on the overhang area rather than between the webs.  Does anyone on the List have any experience with this situation?  I did not design this deck but was wondering if I should approach the City about a possible problem.

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