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

concrete cover for liquid-containing facilities

concrete cover for liquid-containing facilities

concrete cover for liquid-containing facilities

I have a recent discussion with a consultant about minimum concrete cover for walls for a waste water containing tank. I read in ACI350 it could be only 2", but our Consultant insisted to use 3". We wish to keep my 2" as the code prescribed. I have also some minor low walls inside which is only 10", and taking this large cover for a double curtain reinforcement would place my rebars oddly close.

Any possible basis for the 3"? I just felt its quite too much? I was just thinking a possible reason is for more safery against deterioration. Any thoughts?

RE: concrete cover for liquid-containing facilities

Two inches always works for me. But if the people paying you want 3 inches, well, that's their decision. If you have 10 inch walls, they're too thin anyway. You can't reinforce them, get in waterstop, and get a stinger in the space. I see 14 inch walls in your future.
Note that the Z factors, predicting cracking, change when the cover is different than 2 inches.

RE: concrete cover for liquid-containing facilities

Thanks a lot for this Jed. I may need to economize some minor walls. They are just interior walls only around 5 ft. Interior wall ( not necessary to put waterstop) and not highly stressed, w/c i could still detail to ensure cracking is controlled. But i'll take note on the the "stinger" item, its a good point.

RE: concrete cover for liquid-containing facilities

For a 10" wall, presumably with load only on one side, can't you just use one layer of reinforcing on the outside face?

RE: concrete cover for liquid-containing facilities

Trying to get a contractor to place one layer of reinforcing anywhere but the middle is a challenge. If they do skew it, it's just as likely to be on the wrong side as the right side.

RE: concrete cover for liquid-containing facilities

JedClampett, to my knowledge, we've never had an issue with getting a single layer of reinforcement in the correct face of a wall for the culverts, retaining walls, etc. that we do. Of course, we have field engineers on-site for QA. I guess it depends on the contractors you're dealing with and the level of oversight provided.

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


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. 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