×
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

Asphalt pavement to concrete slab continuous joint detail

Asphalt pavement to concrete slab continuous joint detail

Asphalt pavement to concrete slab continuous joint detail

(OP)
Hello everyone,

I'm on a project where the interior pavements are 6 inch slabs with a 8 inch base layer, and the exterior pavement is 3 inch asphalt with an 8 base layer and no subbase. Subgrade is pretty good (CBR >20%). The project is private and the biggest load will be occasional service trucks. I'm only worried about the transition between this pavements, as in one place they must be aligned and I worry that if not properly compacted the asphalt will deform more than the concrete and the joint will not be very smooth. I used to have a drainage channel with a steel grate to sort of help yet it was removed. What is the joint details that has worked for you in similar situations? I have seen a lot of details on the streets with some problems.

Kind regards.

RE: Asphalt pavement to concrete slab continuous joint detail

I'd at least have the same subgrade elevation for each and taper up that to the flexible pavement say in about 4 feet. If subjected to freezing, expect some difference in later years. Likely the flexible will drop some, probably due to the rigid being up more than when built. If possible compact the asphalt when still very hot and slightly higher.

RE: Asphalt pavement to concrete slab continuous joint detail

Slope the vertical face of the concrete transition at about 20-30 degrees. This allows the asphalt interface to always be pushed against the concrete, thus more likely maintaining a closed joint between the two. It also provides additional support to the asphalt pavement at a high stress area.

RE: Asphalt pavement to concrete slab continuous joint detail

3" asphalt with 8" base might be a bit light for any service vehicles...

Dik

RE: Asphalt pavement to concrete slab continuous joint detail

(OP)
Thanks for your suggestions!.

dik, the pavement has very low traffic, you think there might be rutting problems for high loads? Those thicknesses are common here. Base is chemically stabilized.

RE: Asphalt pavement to concrete slab continuous joint detail

thanks... Dik

RE: Asphalt pavement to concrete slab continuous joint detail

MonsieurR....rutting is controlled by the deflection (i.e.,stiffness) of the subgrade. You do this by building the pavement from the bottom up as OG suggests. Stabilize the subgrade, provide a competent base, and provide adequate thickness of the asphalt to minimize asphalt cracking (stress level at the bottom of the asphalt layer controls asphalt fatigue cracking).

Here is a detail of the sloped concrete transition. This was done for a light traffic municipal street with no freeze/thaw issues....

https://res.cloudinary.com/engineering-com/image/upload/v1524651335/tips/Asphalt_Concrete_Transition_lfatdl.pdf

RE: Asphalt pavement to concrete slab continuous joint detail

Ron: and the asphalt doesn't fail at the junction of the concrete and asphalt?

Dik

RE: Asphalt pavement to concrete slab continuous joint detail

I am surprised you are not using the agency standard driveway, curb, gutter details for the transition between public and private roadway. If there is drainage across the road at that point, you will probably need a concrete gutter. A 1H:8V batter on the face of the concrete is sometimes used, however a vertical face is generally acceptable.

RE: Asphalt pavement to concrete slab continuous joint detail

dik...no, but then our asphalt easily gets to 130-140 degrees in summer so it gets remolded against the concrete pretty easily. Have used this or similar detail for about 25 years.

RE: Asphalt pavement to concrete slab continuous joint detail

thanks... Dik

RE: Asphalt pavement to concrete slab continuous joint detail

(OP)
Sorry, attached you will find a picture of the situation. Interior pavements of the building is 6 inch concrete and exterior is asphalt.

I finally ended up putting a small T steel shape in between. Its a detail I have seen (nor particularly elegant). Standard driveway curb is not very appropriate and client wants a "smooth joint".

thanks for all the comments.

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

White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. Download Now
White Paper - The Other Side of Design for Assembly
Assembly level constraints need to be satisfied before the design can move downstream. This white paper will go through the various assembly level issues, which need to be tackled by various organizations on a regular basis. Know more about DFMPro, a design for assembly software. 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