Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Aluminum embedded into concrete

Aluminum embedded into concrete

Aluminum embedded into concrete

Hello all,

I am looking for a material to use for embedding an aluminum post into a concrete slab. The rectangular post does not have a base plate.

Does anyone here have any experience with: Kwixset Exterior Cement

I would prefer to use a known working material (epoxy resin) and a warrantied product from a reliable manufacturer i.e. an oven dried silica mix w/ Sikadur 32 hi-mod, however properties of Kwixset have sparked my interests in the product.

Any information regarding the matter will be helpful- Thank you

RE: Aluminum embedded into concrete

Whatever you use, make sure you coat the aluminum with an isolating coating (bitumastic?) or it will spall off the concrete.

RE: Aluminum embedded into concrete

and the high alkali concrete will dissolve the aluminum. Not really a good idea if you can avoid it. As Jeb mentions, you have to isolate it. For my thesis, I was interested in determining crack propagation through concrete beams in torsion (50 years back and only the Russian research had any significant progress). First kick at the cat, I used aluminum foil, because it broke easy with almost no elongation... It was a really dumb idea.


RE: Aluminum embedded into concrete

yes...as JC noted, isolate the aluminum from the cementitious material. Coat with Bitumastic (preferred) or at the least, clear acrylic. I've done hundreds of embedded aluminum structures...all were isolated...all still performing...some are over 30 years old.

RE: Aluminum embedded into concrete

Wow, you guys are great. I appreciate the quick feedback! Yes the aluminum corrosion is my main concern. I will make sure to isolate regardless of anchoring material used. Any strong personal preferences between the two anchoring materials- fast setting kwixset or warrantied sikadur32?

Hopefully I will be able to contribute at least a fraction of the amount I am learning here. Thanks again!

RE: Aluminum embedded into concrete

I don't think the Sika material is really appropriate for this use. Sikadur 32 is more of just an adhesive, used for crack injection. I have no doubt it will work, but I bet if you call them, they'll have something better. For instance, SikaGrout 212 is a non-shrink grout that might work nicely. The Kwikset material will likely work too, but it's a more low tech material.
Basically, this is really not that demanding of an installation. If you can fill the hole, and not have it totally shrink away (kind of hard dimensionally), it will lock the post in there.

RE: Aluminum embedded into concrete

A clear methacrylate coating properly applied will protect the aluminum and need not be removed. The addition of chlorides can aggravate galvanic corrosion of aluminum in concrete. Galvanic corrosion can be prevented if aluminum is not allowed to contact other metals such as steel reinforcing rods. Coating the aluminum with an asphalt or bituminous paint are also another possible prevention method.



SikaGrout 428 FS is a non-shrink, non-metallic, cementitious precision grout.


Sikadur 32 Hi-Mod can also be used to insulate potential areas of contact by coating aluminum.

Aluminum Coating

RE: Aluminum embedded into concrete

UFeng...Sikadur 32 Hi-Mod is overkill. It is expensive as well.

Any good quality non-shrink grout should be fine.

Go Gators!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


eBook - Rethink Your PLM
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. Download Now
White Paper - Using Virtualization for IVI and AUTOSAR Consolidation on an ECU
Current approaches used to tackle the complexities of a vehicle’s electrical and electronics (E/E) architecture are both cost prohibitive and lacking in performance. Utilizing virtualization in automotive software architecture provides a better approach. This can be achieved by encapsulating different heterogeneous automotive platforms inside virtual machines running on the same hardware. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close