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 in concrete (yes again)

Aluminum embedded in concrete (yes again)

Aluminum embedded in concrete (yes again)

I provide engineering services to a stair and railing manufacturer in the Midwest. I was researching the concerns of embedding an aluminum post into a high-strength non-shrink grout for a railing application, and I came across many threads discussing the matter. However nowhere did any of the posts (that I could find) discuss powder coating of the aluminum. According to the Aluminum Design Manual 2010, M.7.3 states "Aluminum shall not be embedded in concrete with corrosive additives such as chlorides if the aluminum is electrically connected to steel. Unless the concrete or masonry remains dry after curing and no corrosive additives such as chlorides are used, aluminum surfaces to be placed next to or embedded in concrete or masonry shall be:
a.) given one coat of suitable paint....or
b.) given a heavy coating of alkali-resistant bituminous paint or
c.) isolated with a suitable plastic tape or other isolation material.
Wouldn't powder coating of the aluminum be a sufficient barrier? Also in the case of an aluminum railing post, I read that an epoxy grout was recommended because it is less harsh than the concrete. I need to research the specific mix more closely, and I don't disagree that it is not an ideal situation, but I don't see anything that discourages embedding aluminum in concrete.
I am a simple structural engineer and don't pretend to be a chemist or corrosion engineer, so your thoughts and experiences would be welcome.

RE: Aluminum embedded in concrete (yes again)

Can snow and salt get piled against these?
If so then are you willing to bet that your coating stays intact during installation?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Aluminum embedded in concrete (yes again)

Powdercoating meets condition a). Whether that is suitable for your application is unknown.

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!


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