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RE: Masonry: Epoxy-injection for shear repair?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaoc '" <seaoc(--nospam--at)seaoc.org>
- Subject: RE: Masonry: Epoxy-injection for shear repair?
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Tue, 26 Aug 1997 10:27:00 -0500
Michael, Call Mike Schuller of Atkinson-Noland & Assoc. 303-444-3620. Mike is very knowledgeable in masonry repair and epoxy injection. Mike has also developed a method of grout injection (Re: Masonry Construction, Sept. 1996). The contractor that has actually repaired several masonry walls using grout injection is Hunt Valley Masonry of Baltimore 410-683-0177. The grout injection method involves drilling and porting similar to epoxy injection, but the material is a fine grout which has properties compatible with the masonry. Epoxy is much harder than the masonry and is not all that compatible with masonry. Mike has some fairly impressive data on masonry walls that were constructed, cracked, repaired, and tested. Additional references: Proceedings "International Brick Masonry Conference 1991, "Strengthening and Durability of Decayed Brick Masonry Repaired by Injections, by Binda, Baronio, & Fontana. ASTM STP 992, 1988, "Masonry Cracks: A review of Literature", by Grimm City of LA RGA #1-91, "Crack Repair of Unreinforced Masonry Walls with Grout Injection", May 22, 1991. Regards, Harold Sprague Black & Veatch ---------- From: Livingston, Michael To: 'seaoc' Subject: Masonry: Epoxy-injection for shear repair? Date: Monday, August 25, 1997 6:46PM 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
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