PtPavement Type Sl tiS election - Georgia Department of ...€¦ · Pavement Evaluation ......
Transcript of PtPavement Type Sl tiS election - Georgia Department of ...€¦ · Pavement Evaluation ......
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P t T S l tiPavement Type Selection
November 2010State Transportation Board MeetingState Transportation Board Meeting
Georgene M. Geary, P.E.State Materials and Research Engineerg
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National Guide in Development
*Anticipatedin Type
S l ti * 2011Selection*
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Overview
P t ToPavement Types
P t E l tioPavement Evaluation
P t T S l ti PoPavement Type Selection ProcessoLCCA- Life Cycle Cost Analysis
oAlternate Bidding Opportunity
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Pavement TypesPavement Types
Fl iblFlexible –Asphaltic Concrete (HMA)
Rigid –Portland Cement
(HMA) Concrete (PCC)
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New Pavements (High Traffic Interstate)
Fl iblFlexible –Asphaltic Concrete
Rigid –Portland Cement Concrete
11‐12 “PCC/CRC12‐18” HMA
12” GAB
11 12 PCC/CRC
3” HMA
12” GAB
12 18 HMA
HMA= Hot Mix Asphalt concretePCC= Portland Cement concreteCRC=Continuously Reinforced ConcreteCRC Continuously Reinforced ConcreteGAB=Graded Aggregate Base
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New Pavements (State Routes)
Fl iblFlexible –Asphaltic Concrete
Rigid –Portland Cement Concrete
8 10” GAB
8‐12 “PCC
8‐12” GAB
6 ½”‐12 ½” HMA
8‐10 GAB8 12 GAB
HMA= Hot Mix Asphalt concretePCC= Portland Cement concretePCC Portland Cement concreteGAB=Graded Aggregate Base
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Pavement Evaluation‐Existing Roadways
• Review Concept for the Project• Gather Historical InformationGather Historical Information
• Existing Type of Pavement• Gather Existing Condition of Pavement• Gather Existing Condition of Pavement
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Considerations for Alternatives
Widening or new construction?Widening or new construction?
Rehabilitation possible or reconstruction necessary?
Additional pavement structureAdditional pavement structure required?
B id l d iBridge clearances, drainage issues?
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Pavement Type Selection Process
Decision FactorsDecision Factors
• Initial Cost
if C l C ( CC ) f• Life‐Cycle Cost (LCCA) factors• Total Maintenance Costs (discounted)
• Annualized Agency costAnnualized Agency cost
• Annualized User Costs
• Other factors include:• Ease of Repairing/Maintaining, Constructability, Construction Time,
Expected Life
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Life‐Cycle Cost Analysis (LCCA)
FactorsFactors
• Initial Cost
i d h bili i C• Future Maintenance and Rehabilitation Costs
• Future Salvage Value
• User Costs (considered separately)User Costs (considered separately)
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LCCA – 40 year analysis period
InitialC
ResurfacingConstruction
Asphalt
Time Salvage
Rehabilitation
Concrete
TimeTime Salvage
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NPV NPVLCCA NPV1 NPV2
Initial costs2Initial cost1Compare Net Present
Maintenance Maintenance
Value (NPV) of alternatives
Results used in Pavement costs2Costs1Type Selection Process
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Alternate Bidding OpportunityAlternate Bidding Opportunity
• Pavement Designs comparable (required)
• LCCA costs comparable (preferable)
• Can increase # eligible bidders
• Competition = Costs
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Questions?Questions?