×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

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.

Students Click Here

What density to use for road material if...

thread158-459799

What density to use for road material if...

What density to use for road material if...

(OP)
Hi there everyone,

I got some test results for some quarry material from a supplier for a road material.

Say for example, if I need to put down the quarried material at 102% Standard compaction effort for a 100m x 10m road at 150mm thick... what's the density I'm actually looking at in the test report? What would the working out be besides volume of the road...
100 x 10 x 0.15 x density??

Right now I'm looking at a report that says the Standard MDD for the material is 1.99, at 9.8% OMC... would that mean I'd be going for the Bulk Density? I.e. 1.99 * (1 + .098) = 2.19 t/m3?

I've always used a "rule of thumb" for base courses and sub base materials through out my career... but would like to be slightly more refined...

Thanks!

RE: What density to use for road material if...

according to your numbers, you'd look for 102% of 1.99, which would be the dry density. That'd return a value of 2.03 g/cc. At an optimum moisture of 9.8%, that'd return a moist density of 2.229 g/cc, or 139 pcf.

Fun with numbers!

f-d

ípapß gordo ainÆt no madre flaca!

RE: What density to use for road material if...

This is explained in soil mechanics books as demonstrated by fd.

The proctor tells you the standard dry density and the moisture content. To get 102% compaction (which is achievable) the standard proctor maximum dry density is multiplied by 102%. Then you add the water content 2.03+2.03x0.098=2.229g/cc or T/m3.

Based on your example above you would have 100m x 10 m x 0.15 m x 2.229 t/m3 = 334 t in place. You should understand that part of the weight is soil and part of it is water, your source material does not come at the optimum moisture content.

RE: What density to use for road material if...

john1318....Unless you have cohesive materials in your subgrade or base material, I would not use a standard Proctor as the lab test. I would use a modified Proctor and compact such that the in-place density is 98 percent of the lab Proctor.

RE: What density to use for road material if...

Rule of thumb use 20kN/m3 to 22kN/m3 which is a bit less than concrete 24kN/m3. Bearing in mind a well graded material will be denser than single sized aggregate.

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

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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