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

Laterite Road Building - Definition Question

Laterite Road Building - Definition Question

(OP)
Looking for some help on definition terminology.

In a document on laterite roads the following data is presented

Base properties
PI = 15, P425 = 48; PM = 720
CBRs @ 98% BS Heavy = 24%
Cum. Traffic to end 2003 = 0.28 MESA

My question -
1) P425 represent a fraction but on what scale. is this percent passing 425 um sieves
2) What does PM stand for - I'm guessing screen size but would expect to see 710 um
3) BS Heavy - I understand what CBR is and associated percentage.
3) What does MESA stand for - I think Million Equivalent Single Axials

Thanks in advance

RE: Laterite Road Building - Definition Question

1. P425 = Percentage material passing the 0.425 mm Sieve
2. PM = Plastic Modulus
3. BSH = British Standard Heavy Compaction

Tests involving moisture-density relationships, CBR and unconfined compression were carried out using the British Standard Heavy (BSH) energy level. If the British Standard Light (Proctor) compaction mould is utilised, the compactive effort for the BSH consist of the energy derived from a 4.5kg rammer falling through 45cm onto five layers, each receiving 27 blows. When the CBR mould is used, the BSH compactive effort is also derived from a 4.5kg receiving 62 blows in five layers (Osinubi 1998). Compaction was only carried out at BSH energy level to simulate the maximum expected strength gain that can be achieved on site.

4. MESA = Million equivalent standard axles

RE: Laterite Road Building - Definition Question

(OP)
Great - thanks

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