INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!

*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.

Jobs

Concrete Pan Reinforcement

Concrete Pan Reinforcement

(OP)
We are designing a large truck delivery parking lot re-paving project and are adding a 12' wide concrete pan to replace a small portion of the existing asphalt. The geotech pavement resurfacing options are: (1) 11" of asphalt on 12" stabilized subgrade or (2) an 11" concrete section with 12" SS. The Client has selected the asphalt section, and I'm assuming the concrete pan needs to meet the recommended concrete section. A few other items to note:

(1) I've typically designed 6" thick concrete pans and never spec'd reinforcement
(2) The typical DOT section is 6" thick and does not include reinforcement
(3) The geotech report does not mention the need for reinforcement, but they could consider this a responsibility of the civil/structural engineer

Would concrete reinforcement normally be included for this application (thicker section and heavy-truck traffic)?

RE: Concrete Pan Reinforcement

Quote:

Would concrete reinforcement normally be included for this application (thicker section and heavy-truck traffic)?

Yes, the trucks can twist and turn in any direction. Loading is more or less unpredictable. For situations like this we used a minimum design of 12" thick, 4000 psi concrete with #4 bars @ 12", each way, top and bottom. Depending on soil conditions, dowels at joints may be appropriate, too.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

RE: Concrete Pan Reinforcement

You might consider 15M (#5) at 16 or 18 o/c... it's easier to place and walk on (through?).

Dik

RE: Concrete Pan Reinforcement

(OP)
Thanks guys. I just spoke with the geotech and they stated they actually avoid recommending reinforcement, even in thicker concrete sections, unless it's on a major highway. They said they've seen too many issues with rebar here in the harsher environments of Colorado. I'll try to do some more research, and meanwhile any additional comments would be appreciated.

RE: Concrete Pan Reinforcement

Most tank trail turning pads on Army training ranges are thick, unreinforced concrete sections. Normally, only S&T steel is provided, though they may also have steel fibers to toughen the surface additionally against treads wear.
Dave

Thaidavid

RE: Concrete Pan Reinforcement

We have recently moved to plastic fiber reinforced concrete for hard stands where trucks are
turning and so far so good. (and its easy to place).

RE: Concrete Pan Reinforcement

SteynvW:

You may want to re-evaluate the use of plastic fibres; they provide little added strength except in their control of bleed water.

Dik

RE: Concrete Pan Reinforcement

The jury is still out on the micro-fibres, they claim it helps with plastic shrinkage and increased abrasion resistance, but perhaps the hard-stands would've been just fine without them.

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!


Resources


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