Epoxy anchors vs. standard hook anchor
Epoxy anchors vs. standard hook anchor
(OP)
I've been asked by the contractor if he can use epoxy anchors vs. the standard anchor on a project. Is there any reason why this cannot be done. Obviously I've checked all loads and everything works fine. Thanks






RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor
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RE: Epoxy anchors vs. standard hook anchor
By the way there are so many if and buts like temp range, cleaning of hole, air voids in epoxy pumped in etc. In USA it is mandatory to have inspection for these anchors. I would rather always favour traditional hooks embeded while pouring concrete.
RE: Epoxy anchors vs. standard hook anchor
This certification would be with the individual, not the company, and the intallation would ned to be performed by the individual (not someone else with the certified person on site or even supervising).
This seems like a nice step forward.
As mentioned above, a lot of things can go wrong with installation (namely improper - or no- cleaning of the hole).
RE: Epoxy anchors vs. standard hook anchor
You lose inherent quality control items by adding the possibility of inadequate bond due to improper hole cleaning and inadequate bond due to air voids between the rod and the concrete. With Standard Hooks, seeing is believing. This is addressed by many engineers by requiring pull tests on the epoxyied rod, however.
RE: Epoxy anchors vs. standard hook anchor
I'm located in MN so there isn't a need to design for seismic. I don't have any lateral or uplift loads associated with my anchors.
I've also made sure all of my edge distances and spacing are in check with the manufacturers recomendations.
Thanks again
RE: Epoxy anchors vs. standard hook anchor
I won't allow them where there is rebar congestion.
RE: Epoxy anchors vs. standard hook anchor
Re. dynamic loading; most adhesive anchors do not have approval to use under dynamic loading conditions. As I remember Hilti's HVU and HVZ systems have these approvals.
RE: Epoxy anchors vs. standard hook anchor
Yes, there are two reasons why this can not be done.
1) Contractors notoriously can not get this right. At two different jobs within just this past week I was able to pull out, with one bare hand, allegedly epoxied in dowels.
a) I found holes drilled 2" deep for # 6 bars
b) I found holes drilled 2" deep for # 5 bars
c) I found holes not BRUSHED out prior to placement of epoxy. Blowing the hole out with that big construction air compressor that blows a quart of oil per day WILL NOT WORK. The holes have to be BRUSHED out and blown out with clean (oil/water free) air.
d) I found cases where the mixing tube was not placed on epoxy gun so that in the hole the epoxy was black on one side white on other side.
e) I found places where #4 bars were hammered into 1/2" dia. holes and the epoxy was squeezed out on the pile of dust that was still around the top of the hole!
All that just in one week!
2) The placement of rebar by drilling/epoxy according to chpt 17 is a required continuous inspection. The owner/client will need to be informed that his testing/inspection budget is going to take a huge hit as the special inspector will be spending a LOT of time monitoring the correct placement/installation of these dowels.
If you allow this you may want to consider having a pre-con meeting to review the process of installation and inspection with the inspector and the contractor.
RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor
PS, no matter where you are, you have seismic loads. You cant just neglect them entirely.
RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor
Keep that in mind
RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor
What do you do?
Generally replace them with chemical anchors.
One other thing to consider is the set time.
The RE 500 has a very long cure time, like 24 hours.
Cannot be disturbed during cure time!
The HY 150 cures in like 5 minutes.
Bolts must ge set in adhesive filled holes immediately!
This should be considered for the application.
RE: Epoxy anchors vs. standard hook anchor
RE: Epoxy anchors vs. standard hook anchor