what is a resource? any physical or virtual entity of limited availability a new or reserve supply...
TRANSCRIPT
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What is a Resource?
• 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"
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Streets and Local Roads Resources
Philip KresgeSr. Director, National Resources
National Ready Mixed Concrete Association
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Streets and Roads Thickness Design
Longitudinal joint
Transverse joint
Subgrade
Subbase
Surface Texture
Surface smoothnessor rideability
Thickness Design
Dowel bars (may be optional)
Concrete materials
Tiebars
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Understanding Design Optimization
• Design optimization is the balance of performance features and costs.
• Design optimization involves adjusting variables to:
• Achieve long life (durability)
• Reduce initial costs
• Minimize maintenance and rehabilitation costs, and/or
• Enhance sustainability.
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Introducing StreetPave
• 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
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Global Inputs in StreetPave
• Project information• Design life• Reliability*• Failure criteria*
• Terminal serviceability• Percent cracked slabs
*Should be selected based on policy and experience
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StreetPave Input Examples
First screen of walk-through wizard
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Co
st
Initial CostRehabilitation Costs
Maintenance Costs
Salvage Value
Time
Co
st
Net Present Worth
Time
Life-Cycle Cost Analysis
Combines all present and future costs (benefits)
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Where to find StreetPave
• Available in two formats• Full-feature Windows®
version in available from ACPA website at www.acpa.org/bookstore
• Free, limited feature web-based version on ACPA’s website at www.acpa.org/StreetPave/index.asp
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What can be done with an existing asphalt pavement?
Concrete Overlays
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Historical Review• 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
Concrete Overlays
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Why Concrete Overlays?
• To enhance curb appeal• To rehabilitate existing surface • To add structural capacity• To save money (reduce maintenance)• To enhance safety
• Lighting• Skid resistance
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www.cptechcenter.org/publications/overlays/index.htm
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Ultra-Thin Whitetopping
• By Definition• Thicknesses between 2” and 4”• Bonded to underlying surface• Short joint spacing 2’ – 6’ panels• Existing asphalt pavement as base
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Rte. 30, Lancaster, PA
• 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 – NRMCAWWW.NRMCA.ORG
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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 – NRMCAWWW.NRMCA.ORG
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High/Early Strength concrete mix used to facilitate opening to traffic in 24 hrs.
Copyright ©2010 – NRMCAWWW.NRMCA.ORG
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Rte. 30, Lancaster, PA
• Placed Oct. 1995• Over 1,500 trucks
per day • 8.2+ million trucks
in 15 yrs. service
Copyright ©2010 – NRMCAWWW.NRMCA.ORG
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• Available through the National Concrete Pavement Technology Center
• www.cptechcenter.org
Copyright ©2010 – NRMCA
WWW.NRMCA.ORG
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Other Resources
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Training presentation available in-house or as online webinar
Contact Bob Long at ACPA for details
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Life-Cycle Costs - Executive Overview
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Life-Cycle Costs - Technical Fact Sheet
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Sustainability Considerations
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www.nrmca.org
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www.pavement.com