Concrete anchor question (epoxied in)

[Grumpy356]

Concrete guys.

I have a slab and I need to put some 3/8” anchors in (to support some posts)

I know when I was building my house the engineer speced that the anchors should be epoxy in place anchors to secure the base plate to the slab, but I don’t remember what they were. I just remember they were supposed to hold as hard as an anchor that was poured in place.

I think they were made by HILTI.

Does anyone know what I am talking about and can y’all recommend me a product?

[DB_1]

I'd check out the Hilti site if you haven't already or better yet call them up and see what they recommend. Not the same application as you but I used Simpson 5/8" drop in anchors to mount my bender in the slab on the side of my house and no problems to date. I found them at my local builders supply store. Home Depot carries the Simpson brand products but I haven't seen the anchors there.

Are you talking about the anchors that have threaded studs sticking up? In any case, Hilti has all those kinds of anchors and the epoxy type.

[v6toy4x]

a typical "epoxied anchor" is usually just a piece of all thread. Now the epoxy itself can come from a number of suppliers. Hilti is of course the "snap on" of anchors and epoxies and you will pay accordingly. An economical substitute is USUALLY Simpson SET and a piece of all thread. The problem is calculating the required load which then will determine the size of all thread and the embedment or depth of the hole. Can you provide a little more info on exactly what you are doing and will it need inspection?

[roarksupply.com]

You can use epoxy or you can use wedge (expandable) anchors.

With epoxy you have to get the hole's free of all dust/dirt. Also, there is a specification on how to set them properly. If they are all thread, you need to spin them in the hole so the epoxy "bites" into the threads.

We were on a job where two different installers put in the epoxy anchors. The project was well documented, called for all kinds of non-destructive testing and many of the anchors failed. They were all from the same installer. Apparently he wasn't spinning them enough or he wasn't spinning them the correct direction and thats what made them fail.

[LCOwner]

roark's correct. Projects here that require a permit to be signed off on need a materials testing lab to witness the installer do the work. The preceedure is something like drill hole, blow out with compressed air, scrub out hole with stiff brush, repeat, fill hole with epoxy pulling out the tip while squirting it in. (joke goes here)

[Mjddddd]

Usally the hole is drilled an eighth of an inch bigger than the rod,the man. of the epoxy has a size spec. with the insructions. Fastenal has the epoxy in smaller tubes that dont inrequire a special caulk gun. If you drill through the concrete they make screens for the bottom of the hole. It also helps to put a divit in the rod where it goes in the concrete, set the rod on a piece of heavy steel and hit with a hammer, this will help prevent it from turning or pulling out of the hole.