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

good morning we are facing prob

good morning we are facing prob

(OP)
good morning

we are facing problem at site for achieving the below shell DEP requirement for the tank foundations sand compaction

The first sand layer shall be compacted with a
plate vibrator to achieve a minimum strength or density of 5 MPa or 98 % Proctor.
The thickness of the compacted layer shall not exceed 0.3 m. The sand shall be
placed and compacted at Optimum Moisture Content ± 2 %.

note the sand saving show 99% less than 5 mm passing

if any recommendation how to achieve this value please help

regards

RE: good morning we are facing prob

I'm confused about your 5mm passing comment....are you saying that very little of the material is smaller than 5mm? If so, that's not sand...it is gravel.

A lift thickness of 0.3m is too thick to be compacted properly with a small plate compactor. Forget the 5MPa requirement and compact to 98% of the Proctor. That's easily tested.

The key to getting compaction will be controlling the moisture content. Keep it as close to optimum as possible.

RE: good morning we are facing prob

If the material is truly mostly larger than 5 mm, I question using any Proctor type test. The compacting is likely to break down the particles and result in a density that is not representative of the site material. I'd use a vibrating table for lab compaction standard compaction and use 90 percent relative density for the job acceptance.

RE: good morning we are facing prob

we are using a 4 ton vibratory roller in order to get 70 percent relative on sand. 4-8 percent moisture and 8 inch lifts max. 6 inch for vib plate. relative density is very specific to the actual gradation of the sand and test fill is recommended to establish the procedure

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