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RE: Slab on grade Crack repairs

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There was a similar problem with the addition of an extra story to the
concrete parking garage next door to our office. Not enough joints, huge
flat areas with minimal curing. If they hadn't post-tensioned it, it
probably would have looked much worse.

They ground down the cracks to create a profile about 3/8 inch wide at the
top and filled them in with some sort of urethane sealant. The roof still
leaks here and there, but it's a whole lot better than it was. The idea with
the polyurethane is to treat the crack as a new control joint, so you want a
sealant profile that is flexible, which you won't get with epoxy. 

I'm not sure if they used a backer rod or not. You usually want the sealant
profile to be thinner in the middle than it is at the points of adhesion to
the concrete.

-----Original Message-----
From: Ed Najjarine [mailto:enajjarine(--nospam--at)permasteelisausa.com]
Sent: Monday, March 03, 2003 12:33 PM
To: SEAINT (E-mail)
Subject: Slab on grade Crack repairs


Gentlemen,

I have a case of a long crack in a Post tensioned Slab with water leakage
through it. they've used epoxy on it, it didn't work, any ideas for
permanent repair.

Thanks in advance,

Ed Najjarine, SE


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