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RE: Concrete crack repair

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The drilling at the ends are good for repairing metals with small cracks that are primarily induced from fatigue.  The drilling eliminates the stress riser and mitigates crack growth propagation.
High grade construction epoxies for concrete repair have excellent bonding characteristics and very high strengths in compression, peel, tension, and shear.  Compression strengths are 15,000 psi plus.  Epoxy resins can be used for concrete structural repairs very effectively.  For sealing for water penetration and active cracks, it is recommended to use a polyurethane as opposed to an epoxy. 
Check out ACI RAP Bulletin 1, Structural Crack Repair by Epoxy Injection.
The US Bureau of Reclamation Guide to Concrete Repair.
The US Bureau of Reclamation Guide is good because it provides guidance on when to use epoxy injection and when to use polyurethanes. 

Regards, Harold Sprague

From: ggg(--nospam--at)
To: seaint(--nospam--at)
Subject: Concrete crack repair
Date: Sat, 12 May 2012 17:39:24 +1000

Having a modest building experience, let me ask this of our learned colleagues,
especially Harold.
Epoxy, I understand, is good for sealing, but does not have a big strength itself.
Why not, instead, do the following:
1. Drill thru the ends to prevent further growth.
2. widen the mouth using a small dia grinder
3. Fill with any good putty. They often fuse with parent concrete
and offer almost continuous material.
Gregory from Oz

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