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Grants and Contracts Details
Description
OBJECTIVES: 1) Identify all the necessary input and analysis parameters required. 2)
Develop appropriate calibration procedures for Kentucky conditions. 3) Develop an
implementation plan to guide the Cabinet in establishing the necessary data collection
requirements which may be necessary to support the use of the new procedure.
BACKGROUND: The National Cooperative Highway Research Program (NCHRP) is currently
developing a new Pavement Design Guide based on mechanistic procedures. Kentucky is one of
a very few states which has used mechanistic-empirical design procedures for many years. The
Cabinet plans to implement this new design procedure over the next several years. A project is
currently underway, "Development of Load Spectra for Use in Pavement Designs in the
Implementation of the 2002 Design Guide" which deals with the development of the required
traffic parameters of the new design procedure. It is anticipated that the work begun on the load
spectra project would be incorporated into this project to provide the Cabinet with all the inputs
of the new design procedure. The new design procedure utilized various material models
coupled with a mechanistic analysis procedure to predict pavement performance. This resulting
performance is then used to determine if a pavement structure is suitable, based on their local
condition and historical pavement performance. The new guide will require the user to calibrate
the results to these local conditions and establish performance requirements for a hierarchy of
pavement structures. The results of this project will permit the Cabinet to be a leader in the
implementation of this procedure.
FY 2006 ACCOMPLISHMENTS: Work has continued to determine typical input parameters
for Kentucky materials, default values for lIMA properties have been determined and a
pre1iminary sensitivity analysis has been initiated. Parameters which have been investigated are;
HMA gradation (coarse and fine), nominal HMA base size (0.5,0.75, and l.O-inch), distribution
of vehicle classification (Truck Traffic Category TIC), bumping the PG binder grade for better
performance, truck volume, subgrade CBR, and HMA thickness. The Center has also continued
its assistance to the Transportation Cabinet in participation in the FHW A Lead States Group for
implementation ofthe new design process.
FY 2007 PROPOSED WORK: The sensitivity analysis will continue utilizing a new version of
the software which should become available by early summer. The analysis will also be
expanded to include additional parameters for lIMA pavements and PCC pavements. Work will
begin companion designs will also be conducted with the current Cabinet procedure.
PROJECTED COST THROUGH FY 2006:
PROGRAMMED COST FY 2007:
TOTAL ESTIMATED COST:
$292,000
$ 75,000
$405,000
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