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Epoxy coated bars, adhesive anchorage, and high temp

Epoxy coated bars, adhesive anchorage, and high temp

Epoxy coated bars, adhesive anchorage, and high temp

(OP)
During a job we had to demolish out a 12 inch area of a curb around an opening in an industrial plant. We're now putting the curb back using epoxy anchored dowels 5.75" O.C., 7" into the existing slab. The area frequently gets to 110 degrees so I specified a limited creep epoxy. I was right on the edge of my required strength per appendix D and the manufacturer of the epoxy anchorage system.

They're starting today and I go out to the site and they've brought epoxy coated rebar...

I can't find anything from the manufacturer or elsewhere of what this will do for the bond strength of the epoxy anchorage system but I don't like it. Anyone have a reference I can cite that I can quote to contractor to get them to just give me some plain bars? They're going to hate me bending another couple hundred dowels but I don't see any way around it. If someone leans on the railing attached to this curb they're looking at a 370 foot fall.

Maine EIT, Civil/Structural.

RE: Epoxy coated bars, adhesive anchorage, and high temp

If it isn't what you specified then that's not your problem, it's theirs. They should change it. Have you called the epoxy manufacturer directly? I can see this invalidating their published capacities.

RE: Epoxy coated bars, adhesive anchorage, and high temp

This will only affect one of your possible failure modes: bar pullout. Any chance your design was governed by some manner of concrete breakout?

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Epoxy coated bars, adhesive anchorage, and high temp

(OP)
Bar pullout at 98% followed shortly by concrete strength at 93%. It a cantilever so I really need that bond strength.

I just talked with them and they're going to give me plain bar, thankfully they're accommodating. Thanks guys.

Maine EIT, Civil/Structural.

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