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Re: Slab on grade Crack repairs[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Slab on grade Crack repairs
- From: GSKWY(--nospam--at)aol.com
- Date: Mon, 3 Mar 2003 16:40:06 EST
In a message dated 3/3/2003 3:38:14 PM Eastern Standard Time, enajjarine(--nospam--at)permasteelisausa.com writes:
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
This doesn't appear addressed to me, but I will answer it anyway.
When you have a moving crack, epoxy generally wouldn't work. In most cases, you just get cracking adjacent to the original crack. Typically, you rout and seal with a flexible urethane. There are at least a half dozen Sika and Masterbuilder products that will work. Water-catalyzed urethanes (hydrophic and hydrophilic expanding urethanes) are generally not used though - they are good in walls but are not really durable enough for slabs.
If it is a newly constructed slab, you will want to wait about two years so that most of the shrinkage has occurred. If water leakage is a concern during this time, the easiest thing to do is just apply an elastomeric membrane along the crack, extending 6 in. either side of the crack.
No repair is permanent though - all crack sealants need to be periodically inspected and replaced.
Gail S. Kelley, P.E.
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