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Re: Masonry: Epoxy-injection for shear repair?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Masonry: Epoxy-injection for shear repair?
- From: r marmaduke <avi(--nospam--at)az.com>
- Date: Mon, 25 Aug 1997 17:15:58 -0700 (PDT)
Michael: It's probably a mixed bag, that is, there are lots of micro-cracks, or cracks that opened and then closed again, plus yielded shear steel. Epoxy depends entirely on preparation, and since cracks can't be prepared, and may have been open for a decade oxidizing before the repair attempt, you can't predict reliable performance. Epoxy anchors, on the other hand, are set in fresh, cleaned, carbide-cut matrix, with a mixture of epoxy gel and prismatic ceramic beads to assist in "bite". Now THAT's a structural connection! Best bet, look at crack-epoxy as a cosmetic repair and leave it at that. At 04:46 PM 8/25/97 -0700, you wrote: >I'm evaluating a 10-story masonry apartment building built in the early >70's where the walls sustained cracking from both the Loma Prieta >earthquake and differential settlement. About 5 years ago, it was >"repaired" using epoxy injection. I'm trying to track down which >product was used without much success. Apparently the criterion was to >fix all cracks you could stick a credit card into and call the rest >"cosmetic". >My question: Are these epoxy injection methods effective for restoring >shear capacity of masonry walls? >I've talked to some manufacturers who say it is great, stronger than the >surrounding masonry, etc. but who were not forthcoming with test data. >A colleague of mine suggests that for every crack, there are many more >micro-cracks just waiting to open up nearby. And where there is a >visible crack, the steel may have yielded, reducing the capacity of the >wall if steel was used to resist shear. >Does anyone have any opinions/data on this method of repair? > >Michael Livingston, SE >michael.livingston(--nospam--at)intres.com > > > > Regards, Robert Marmaduke PE POB 28995, Bellingham, WA 98228 360.738.0854 VOX/FAX avi(--nospam--at)az.com http://www.az.com/~avi
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