Wednesday, November 11, 2009

RE: Cracking in new PS concrete parking deck

Yes, I can see future problems developing already. Efflorescence indicates that the deck is leaking and moisture is getting into the cracks. This combined with the carbon dioxide in the air (parking deck) from automobile exhust fume will create carbonation of the concrete. This will reduce the durability of the concrete structure. If I am not mistaken, corrosion should follow soon.
Francis Hsi, P.Eng., P.E.

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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