×
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!
  • 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

Jobs

Surface dressed road useful life

Surface dressed road useful life

Surface dressed road useful life

(OP)
Does anyone have any information on the useful life of a double layer crushed stone (surface dressing) road.

RE: Surface dressed road useful life

It depends on what's under it!  What is the double surface treatment applied to?

RE: Surface dressed road useful life

(OP)
The double layer surface dressing is on a 150mm laterite subbase stabilised with 5% cement and its used for a medium traffic road (75% of traffic is by 30ton trucks).

RE: Surface dressed road useful life

The only structural layer you have is the laterite base, and it being only 150mm thick, won't last long with the traffic you noted.  I would expect frequent re-dressing will be necessary (at least monthly) and rutting will likely start in the first year or two.

RE: Surface dressed road useful life

(OP)
Ron, thanks for the quick response. But what is the scnenario for same road but with light traffic (50% trucks, 50% cars).

RE: Surface dressed road useful life

Not much different.  It will last a little longer, but not much.

RE: Surface dressed road useful life

(OP)
Please does anyone have a table, chart or refernce to a structured means of assessing the useful life of an existing surface dressing.

RE: Surface dressed road useful life

Road Note 39 (RN39) 'Design Guide for Road Surface Dressing - 6th Edition' by the TRL may help.  

RE: Surface dressed road useful life

Debaser beat me to it . . .  The cement will certainly strengthen the laterite - but you should ensure that you have a subgrade that is "adequate" - say, soaked CBR > 8 onto which to place the cement modified laterite.  We have heavy haul trucks (45 tonne Volvos) on the local road here and they seem to have lasted well over the last 5 years since last surfacing - but with local potholing during the rainy season. Like with any pavements, drainage-drainage-drainage!

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