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Description
OBJECTIVES: The objectives of this study are: 1) to recommend a distress identification
process for major distresses to be used in pavement performance models, 2) to establish a
threshold for rideability and distress thresholds for fatigue cracking, transverse cracking, rutting,
faulting, etc. 3) to identify and monitor calibration sites for evaluation ofthe NCHRP project 1-
37A performance prediction models, 4) to perform an experimental life cycle analysis to
determine the optimum design strategies based on existing pavement conditions, traffic,
treatments, and rehabilitation cycles.
BACKGROUND: More resources are used to preserve and rehabilitate the existing pavements
than to build new ones. In order for the Transportation Cabinet to maintain the Commonwealth's
pavements in an acceptable condition of service, it is estimated by the pavement management
section that a major increase in funding is necessary.
The thresholds of pavement performance on which resurfacing and rehabilitation
decisions are based have great impact on funding at the network level and project prioritization. If
treatments are applied too late, pavements may accelerate deterioration and result in more
expensive rehabilitation later. On the other hand, if treatments are applied too early, the
remaining capacity of existing pavements is not fully used.
In Kentucky, the distress levels of pavements are reflected by their condition points, but
they do not include the detailed information concerning the types and severity of different
distresses. The new pavement design guide under way, the 2002 "Guide for Design of New and
Rehabilitated Pavement Structures," aims to improve the current design practices. It allows the
designer to change pavement design inputs and evaluate the resulting change in pavement
performance. This predicted performance must then be compared to acceptable levels within an
agency to evaluate the effectiveness of a particular design. In addition, it is desirable that the
models used to predict specific distresses are calibrated to local conditions and materials. To use
the new design procedure, the distress data in Kentucky need to be recorded in more detail,
critical distress thresholds need to be defined, and pavement performance models need to be
calibrated. Then, rehab cycles can be predicted for different treatments and an optimum one can
be identified.
FY 2006 ACCOMPLISHMENTS: Initial work has begun to evaluate the levels of distress at
which rehabilitations have historically been conducted for rideability and condition points.
Review has also continued on the l-37A design guide to fully understand the performance
prediction models and their reliability.
FY 2007 PROPOSED WORK: The analysis of historical pavement management data and the
SHRP LTPP database will continue. In addition, field sites may be reviewed to determine actual
distress parameters which may be used in the calibration process of the 1-37A design guide.
PROJECTED COST THROUGH FY 2006:
PROGRAMMED COST FY 2007:
TOTAL ESTIMATED COST:
$213,000
$ 75,000
$400,000
Status | Finished |
---|---|
Effective start/end date | 7/1/06 → 6/30/07 |
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Projects
- 1 Finished
-
Kentucky Cooperative Transportation Research Program Part II KCTRP 07-27
Toussaint, P. (PI), Allen, D. (CoI), Chen, M. (CoI), Crabtree, J. (CoI), Graves, R. (CoI), Grossardt, T. (CoI), Hancher, D. (CoI), Harik, I. (CoI), Hopkins, T. (CoI), Hopwood, T. (CoI), Kreis, S. (CoI) & Pigman, J. (CoI)
7/1/06 → 6/30/07
Project: Research project