overview of precast concrete pavement systems for rapid...
TRANSCRIPT
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Overview of Precast Concrete Pavement Systems for Rapid Repair, Rehabilitation, and Construction of
Rigid Pavements
Presented by Timothy J. LaCossFHWA-NY DivisionAASHTO TIG LeadStates Team Chairman
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Ft. Miller - SuperSlab™ Prestressed Precast Concrete Pavement
Kwik Slab™ Uretek USA™ FDR/DBR
What are PCPS Systems?
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Why Use Precast Concrete Pavement Systems?
Fabricated in Factory EnvironmentHigher Quality Control than fieldEnvironmental Control –improved curingResults in less residual stresses in slabs
Installed Quickly – less risk!!!Can be open to traffic without final slab under-sealDurable Pavement Treatment that has been tested to over 140 million ESAL’sCost Competitive with Rapid Set Concretes
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Project ScopingPavement Evaluation
• Agency Established Protocols for Pavement Treatment Selection
•Assessment Criteria of Pavement and Pavement Foundation
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Project ScopingCapacity Restrictions/Lane
ClosuresWhat are the limitations of our Maintenance of Traffic configuration?
How does this effect my pavement treatment selection alternatives?
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Pavement Treatment SelectionOptions -Based upon Lane
Occupancy Limits
24 hours or more = Traditional CIP Methods
Between 12 -24 hours = Rapid Set Concrete
Less than 12 hours = Precast Concrete Pavement System
RECOMMENDED GUIDELINES
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Types of PCPS Systems
Jointed Precast Systems
•Intermittent Repair & Rehabilitation
•Continuous Pavement
Prestressed Precast Systems
•Limited Intermittent Rehabilitation
•Continuous Pavement
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Engineering Details of PCPSType of system employedSlab thicknessSlab geometryJoint matching needsLoad transfer Reinforcing steelMaterial handlingEncasement Material
Subgrade requirementsBedding requirementsPre & Post-tension requirementsSurface textureRide QualityLoad Transfer EfficiencySlab installation procedures
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Construction Details of Installing PCPS
Material handling equipment needsFootprint requirements
Various slab lift out methodsSub-base preparation needsInstallation and preparation of Load Transfer devicesSlab leveling & alignment needs
Slab under-sealEncasement material placement Contractor crew learning curve & productivity
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Applications of PCPSIntermittent RepairContinuous PavementToll PlazaBridge ApproachIntersectionsAirport RunwayAirport TaxiwayUnder BridgesPort Loading Pads
Roundabouts Utility CutsTunnelsOver poor Sub-baseRadiant Heat-Snow & Ice controlInterchange RampsArchitectural Cross-walks
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PCPS Paving ApplicationsAround the Nation
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Summary
You should now know:Different types of PCPS systems & various applicationsReasons why a PCPS treatment is selectedAdvantages of PCPSBasic understanding of Engineering & Construction details of PCPS
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Summary
For the next 24 hours, you should be hearing about these basic principles and practices as they are applied to this specific project.
I encourage you to ask any question about PCPS throughout this workshop. I’m confident that we’ve got the right people here to get you the answers.
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Thank you !Timothy J. LaCoss
Pavement & Materials EngineerFHWA-NY Division
(518)431-4125, [email protected]
To find out more details about Precast Pavements look atWWW.AASHTOTIG.ORG