Epoxy Anchor: Hole size

[Althalus]

We have a retrofit column on a really thick piece of concrete with a WHOLE LOT of rebar. We're limited on space. And the original installers were not that careful about the rebar placement.

1. The contractor told me that as he was drilling into the concrete, the bit got stuck on some rebar. To remove the bit, he has to drill a second hole (much larger) near the original hole.
2. That leaves us with the problem of filling up that larger hole space while still maintaining tension capacity on the anchor into the concrete.
3. Hilti has no guidance on how thick the epoxy can be beyond the minimum. No data.

What considerations are there for filling up a much larger hole with epoxy?
What are alternatives to fill up that space so the anchors can have sufficient capacity?

 

[dvd]

document from ChockFast on anchor grouting attached

 

[Enable]

If this is not a creep sensitive application, which it likely isn't be virtue of you using epoxy to begin with, why not just do a pull-out test in-situ? I would probably prefer that anyways since it would form part of the QC program, and you wouldn't be forced to use a product that you are unfamiliar with. Naturally I am recommending this as probably overfilling the hole with HY200 would likely be satisfactory even if Hilti won't ordain it so.

FYI here is 5-star's website for those wondering.

 

[Tomfh]

What considerations are there for filling up a much larger hole with epoxy?

Fill it good with real epoxy. Something that won't drain out. You can mix in sharp sand too, depending on the epoxy product.

 

[Just Some Nerd]

why not just do a pull-out test in-situ?

What are the odds the test doesn't give a good enough result? In order words, what are the chances of looking like an idiot when provide a fix that doesn't actually work? Genuinely curious what odds people here would bet on.

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Why yes, I do in fact have no idea what I'm talking about