Asphalt - Leveling Course
Asphalt - Leveling Course
(OP)
I am overseeing an asphalt overlay project, where some of the existing asphalt surface has started to show signs of stripping and aggregate loss, along with some damage from snowplowing operations, leaving some fairly large voids on the surface. The contractor has proposed to use a 12' screed to identify deviations in the surface and intends to place a leveling course in areas that show over a 1" deviation. Otherwise, they feel the 2" final overlay will properly fill these voids and not effect the smoothness of the final surface.
Does anyone have thoughts on whether the 1" deviation is an acceptable limit? I'm concerned that even 1/2" to 3/4" voids will be hard to cover with a 2" overlay, but also realize there are limitations in the minimum thickness of a leveling course.
Does anyone have thoughts on whether the 1" deviation is an acceptable limit? I'm concerned that even 1/2" to 3/4" voids will be hard to cover with a 2" overlay, but also realize there are limitations in the minimum thickness of a leveling course.





RE: Asphalt - Leveling Course
1. The overlay will reflect the undulations if the laydown temperature is high.
2. The overlay will bridge the issues but result in variable density in areas, particularly if the laydown temperature is low.
RE: Asphalt - Leveling Course
When we do leveling courses for roads showing signs of rutting, we use a smaller aggregate mix (9.0 mm max. nominal aggregate). Thin lifts using larger aggregate mixes can have placement issues (segregation, aggregate fracturing, etc.). If the ruts are significant, you may have to consider removing and patching prior to overlay as the issue may be deeper than the surface.
Ron is correct, you will have density issue trying to overlay these deviations. Rollers will bridge over the areas and you will not see it until after the it has been subjected to traffic.
RE: Asphalt - Leveling Course
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Asphalt - Leveling Course
RE: Asphalt - Leveling Course
RE: Asphalt - Leveling Course
If cr-804 in your photo names stands for county route, you could ask your state's LTAP or T2 program for advice.
RE: Asphalt - Leveling Course
RE: Asphalt - Leveling Course
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Asphalt - Leveling Course