what is a resource? any physical or virtual entity of limited availability a new or reserve supply...

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"

Streets and Local Roads Resources

Philip KresgeSr. Director, National Resources

National Ready Mixed Concrete Association

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

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.

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

Global Inputs in StreetPave

• Project information• Design life• Reliability*• Failure criteria*

• Terminal serviceability• Percent cracked slabs

*Should be selected based on policy and experience

StreetPave Input Examples

First screen of walk-through wizard

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)

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

What can be done with an existing asphalt pavement?

Concrete Overlays

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

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

www.cptechcenter.org/publications/overlays/index.htm

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

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

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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!

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High/Early Strength concrete mix used to facilitate opening to traffic in 24 hrs.

Copyright ©2010 – NRMCAWWW.NRMCA.ORG

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

• 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 KresgeSenior Director, National Resources

pkresge@nrmca.org