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RE: Masonry: Epoxy-injection for shear repair?

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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