Concrete Crank Injection
Concrete Crank Injection
(OP)
Hi all. My first post, but I've enjoyed reading many other posts and answers. I have a question of my own:
We are repairing cold joint horizontal cracks on a number of dolphins on a river. The river is subject to tidal motions which put the cracks a few feet below the water line at high tide and in the dry at low tide.
My question is which method of repair is best? The spec. is instructing us to use epoxy injection yet I've got a few different views from a couple subs. One says a polyurethane injection material would be more appropriate. While another is saying that why even bother injecting because the joint will just crack again due to the nature that it is a cold joint in the first place.
Thanks
We are repairing cold joint horizontal cracks on a number of dolphins on a river. The river is subject to tidal motions which put the cracks a few feet below the water line at high tide and in the dry at low tide.
My question is which method of repair is best? The spec. is instructing us to use epoxy injection yet I've got a few different views from a couple subs. One says a polyurethane injection material would be more appropriate. While another is saying that why even bother injecting because the joint will just crack again due to the nature that it is a cold joint in the first place.
Thanks





RE: Concrete Crank Injection
RE: Concrete Crank Injection
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RE: Concrete Crank Injection
RE: Concrete Crank Injection
RE: Concrete Crank Injection
Epoxy injection will give a structural repair but generally has little flexibility or ductility - it may crack through the epoxy or adjacent to the epoxy, depending on forces (impact?) and conditions. Polyurethane injection is a flexible repair.
Talk to an injection repair manufacturer (of both materials) for some reasonable advice about your specific situation. A good specification and good material application will be required to produce a durable repair.
RE: Concrete Crank Injection
I generally prefer an internal injection method rather than a surface injection. By that I mean that the sub moves off the crack a few inches and drills into the structure at a 45 degree angle in order to intersect the crack near the middle of the member. Injection resin is then pumped into the holes and forced out the surface of the crack so you know you have good penetration.
Use a good subcontractor familiar with injection methods
if you expect the job to be done right.
Good luck
RE: Concrete Crank Injection