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Z 2135.6 L811g
Winter 1993
OKLAHOMA LOCAL GOVERNMENT NEWS
PUBLISHED QUARTERLY BY THE CENTER FOR LOCAL GOVERNMENT TECHNOLOGY, OKLAHOMA STATE UNIVERSITY, SPONSORED JOINTLY BY THE
FEDERAL HIGHWAY ADMINISTRATION, THE OKLAHOMA DEPARTMENT OF TRANSPORTATION AND THE OKLAHOMA COMMISSION ON COUNTY
GOVERNMENT PERSONNEL, EDUCATION AND TRAINING.
308 CITD
Stillwater, OK
74074
405-744-6049
Winter 1993
edited by Douglas Wright
What Causes Recurring Wheelpath Ruts?
Question...
Our road department built a one inch hot-mix overlay on a road that
showed moderately deep narrow ruts in the wheelpaths. After a few
months of summer traffic, the ruts came right back again. What caused
this to happen?
Answer...
There are a variety of factors that could contribute to wheelpath
rutting. The ruts came so quickly that possibly it was because you did
not put down a leveling course.
A leveling course is a thin layer of sand-asphalt mix placed on top of the
old road surface, just deep enough to fill the ruts. It should be
OVERLAY
FIG. 2
compacted immediately using a
pneumatic rubber-tired roller. (A
steel drum roller will bridge across
the ruts and not properly compact
the mix.)
Because the leveling course is so
thin, it must be placed on a very hot
day in the middle of the summer.
Also, to compact it well, the roller
must be used on it immediately. It
is usually a good idea to let traffic
run on it for a few days to help
compact it before placing the
overlay on top.
The leveling course helps to prevent
the return of the wheelpath ruts. An
overlay placed above the leveling
course will be a uniform thickness
across the lane as in Figure 1.
When compacted (typically by a
steel drum roller), the density is
achieved, traffic will not have much
effect on it.
If the leveling course is omitted, the
overlay, when placed, will be thicker
in the wheelpaths by the amount of
the rut depth, as shown in Figure 2.
When the overlay is compacted, the
material between the wheelpaths gets
more compaction effort than the
material in the wheelpaths because it
is thinner. Traffic gradually
compacts the material in the
wheelpaths, and the ruts reappear.
Object Description
| Okla State Agency |
Oklahoma State University |
| Okla Agency Code |
'010' |
| Title | Oklahoma local government news, winter 1993 |
| Authors | Oklahoma State University. Center for Local Government Technology. |
| Publication Date | 1993 |
| Publication type |
Newsletter |
| Purpose | What Causes Recurring Wheelpath Ruts?; Training for Newly Elected County Officers by Tim Lyon; APWA Annual Spring Technical Conference; Working in the Pits by Michael R. Mele; The Etiquette of Interviewing Applicants who are Disabled; Software Upgrades for County Officers by Dave Harnley; Charlie Maule To Retire; Latest Developments in Personnel Issues by Tim Lyon; How to Make Roadside Mowing Duty Safer; National Road and Street Maintenance Conferences Moves to New Orleans; |
| For all issues click | Z2135.6 L811g |
| Digital Format | PDF, Adobe Reader required |
| ODL electronic copy | Deposited by the agency in print; digitized by Oklahoma Department of Libraries |
| Rights and Permissions | This Oklahoma state government publication is provided for educational purposes under U.S. coyright law. Other usage requires permission of copyright holders. |
| Language | English |
| Date created | 2013-03-18 |
| Date modified | 2013-03-18 |
Description
| Title | Page 01 |
| ODL electronic copy | Scanned by Oklahoma Department of Libraries |
| Rights and Permissions | This Oklahoma state government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders. |
| Full text | Z 2135.6 L811g Winter 1993 OKLAHOMA LOCAL GOVERNMENT NEWS PUBLISHED QUARTERLY BY THE CENTER FOR LOCAL GOVERNMENT TECHNOLOGY, OKLAHOMA STATE UNIVERSITY, SPONSORED JOINTLY BY THE FEDERAL HIGHWAY ADMINISTRATION, THE OKLAHOMA DEPARTMENT OF TRANSPORTATION AND THE OKLAHOMA COMMISSION ON COUNTY GOVERNMENT PERSONNEL, EDUCATION AND TRAINING. 308 CITD Stillwater, OK 74074 405-744-6049 Winter 1993 edited by Douglas Wright What Causes Recurring Wheelpath Ruts? Question... Our road department built a one inch hot-mix overlay on a road that showed moderately deep narrow ruts in the wheelpaths. After a few months of summer traffic, the ruts came right back again. What caused this to happen? Answer... There are a variety of factors that could contribute to wheelpath rutting. The ruts came so quickly that possibly it was because you did not put down a leveling course. A leveling course is a thin layer of sand-asphalt mix placed on top of the old road surface, just deep enough to fill the ruts. It should be OVERLAY FIG. 2 compacted immediately using a pneumatic rubber-tired roller. (A steel drum roller will bridge across the ruts and not properly compact the mix.) Because the leveling course is so thin, it must be placed on a very hot day in the middle of the summer. Also, to compact it well, the roller must be used on it immediately. It is usually a good idea to let traffic run on it for a few days to help compact it before placing the overlay on top. The leveling course helps to prevent the return of the wheelpath ruts. An overlay placed above the leveling course will be a uniform thickness across the lane as in Figure 1. When compacted (typically by a steel drum roller), the density is achieved, traffic will not have much effect on it. If the leveling course is omitted, the overlay, when placed, will be thicker in the wheelpaths by the amount of the rut depth, as shown in Figure 2. When the overlay is compacted, the material between the wheelpaths gets more compaction effort than the material in the wheelpaths because it is thinner. Traffic gradually compacts the material in the wheelpaths, and the ruts reappear. |
| Date created | 2013-03-18 |
| Date modified | 2013-03-18 |
