What is a Resource?
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Any physical or virtual entity of limited
availability
A new or reserve supply that can be drawn
upon when needed
Something that one uses to achieve an
objective
An input to be used in an activity, especially
production
The ability to deal resourcefully with unusual
problems; "a man of resource"
Streets and Local
Roads Resources
Philip Kresge
Sr. Director, National Resources
National Ready Mixed Concrete Association
Streets and Roads Thickness Design
Surface smoothness
or rideability
Thickness Design
Longitudinal joint
Transverse joint
Surface Texture
Concrete materials
Tiebars
Subgrade
Subbase
Dowel bars (may be optional)
Understanding Design Optimization
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Design optimization is the balance of performance
features and costs.
Design optimization involves adjusting variables to:
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Achieve long life (durability)
Reduce initial costs
Minimize maintenance and rehabilitation costs, and/or
Enhance sustainability.
Introducing StreetPave
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Software tool primarily for streets and roads
Uses mechanistic-empirical modeling for
thickness determination (like MEPDG but less
complex)
Direct comparisons of concrete and asphalt
designs
Allows life cycle cost analysis (LCCA) to
compare “hard costs” (if local cost &
performance data available).
Approved by VDOT for streets and roads design
Global Inputs in StreetPave
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Project information
Design life
Reliability*
Failure criteria*
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Terminal serviceability
Percent cracked slabs
*Should be selected based on policy and experience
StreetPave Input Examples
First screen of walk-through wizard
Life-Cycle Cost Analysis
Initial Cost
Cost
Rehabilitation Costs
Maintenance Costs
Time
Cost
Salvage
Value
Net Present Worth
Time
Combines all present and future costs (benefits)
Where to find StreetPave
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Available in two formats
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Full-feature Windows®
version in available from
ACPA website at
www.acpa.org/bookstore
Free, limited feature webbased version on ACPA’s
website at www.acpa.org/
StreetPave/index.asp
What can be
done with
Concrete
an existing
Overlays
asphalt
pavement?
Concrete Overlays
Historical Review
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Began in late forties and early fifties
First used on Airports and Secondary Roads
In mid-seventies acceptance grew
By late eighties this was normal practice
Significant amounts of state and federal
highways have been rehabilitated this way
Why Concrete Overlays?
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To enhance curb appeal
To rehabilitate existing surface
To add structural capacity
To save money (reduce maintenance)
To enhance safety
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Lighting
Skid resistance
www.cptechcenter.org/publications/overlays/index.htm
Ultra-Thin Whitetopping
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By Definition
• Thicknesses between 2” and 4”
• Bonded to underlying surface
• Short joint spacing 2’ – 6’ panels
• Existing asphalt pavement as base
Rte. 30, Lancaster, PA
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Intersection of Rte. 30 & Oakview Rd.
In front of PennDOT County
Maintenance Facility
Placed Oct. 1995
Existing asphalt pavement less than
three years old
In excess of 1,500 trucks per day
Severe rutting/shoving
Copyright ©2010 – NRMCA
WWW.NRMCA.ORG
Existing asphalt pavement was only 2-3 years old. Severe
rutting, in excess of 5 inches, was a continual problem.
Smaller vehicles actually
“bottomed out” on ridge
of asphalt!
Copyright ©2010 – NRMCA
WWW.NRMCA.ORG
High/Early Strength concrete mix used to facilitate
opening to traffic in 24 hrs.
Copyright ©2010 – NRMCA
WWW.NRMCA.ORG
Rte. 30, Lancaster, PA
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Placed Oct. 1995
Over 1,500 trucks
per day
8.2+ million trucks
in 15 yrs. service
Copyright ©2010 – NRMCA
WWW.NRMCA.ORG
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Available through the
National Concrete
Pavement Technology
Center
www.cptechcenter.org
Copyright ©2010 – NRMCA
WWW.NRMCA.ORG
Other Resources
Training presentation
available in-house
or as online
webinar
Contact Bob Long at
ACPA for details
Life-Cycle
Costs Executive
Overview
Life-Cycle
Costs Technical
Fact Sheet
Sustainability
Considerations
www.nrmca.org
www.pavement.com
Thank You!
Philip Kresge
Senior Director, National Resources
pkresge@nrmca.org