PCI 6th Edition

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PCI 6th Edition

• Introduction to Precast

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Presentation Outline

• Material Applications
• Benefits
• Forming and Production Techniques
• Architectural Possibilities
• Engineering Applications
• Connection Introduction
• Building Construction

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Precast and Prestress

• Precast
• Not cast in its final condition
• Normally mild reinforcement

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Precast and Prestress

• Precast
• Prestressed
• Reinforced with strand
• Strand is stressed prior to casting

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Precast and Prestress

• Precast
• Prestressed
• Post-tensioned
• Strand is stressed after casting and curing

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Applications

• Buildings
• Residential
• Office buildings
• Warehouses and industrial
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Buildings
• Residential
• Office buildings
• Warehouses and industrial
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Buildings
• Residential
• Office buildings
• Distribution Centers
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Buildings
• Residential
• Office buildings
• Warehouses and industrial
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Buildings
• Residential
• Office buildings
• Warehouses and industrial
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Buildings
• Residential
• Office buildings
• Warehouses and industrial
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Buildings
• Residential
• Office buildings
• Warehouses and industrial
• Parking structures
• Justice facilities
• Stadiums, arenas
• Bridges

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Applications

• Other
• WWT facilities
• Airports
• Marine
• Cold Storage
• Light poles
• RR ties
• Silos

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Benefits of Precast

• Vibration Control
• Shortened Construction Schedule
• Engineering Assistance Provided
• Fire Resistance
• Column Free Space

• Unlimited Color and Textures
• Produced Under a Strict Quality Control
  Environment
• Long-Term Durability
• Penetration Flexibility
• Use Flexibility

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Forming Techniques

• Variety of configurations
• Vast flexibility
• Creative structural and architectural advantages
• Multiplecolors

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Long Line Forms

• Economic casting
• Form resembles shape
• Used for gray structural concrete or
  architectural concrete
• Typical products
• Double tee
• Inverted tee beam
• L-beam
• Bridge girders
• Spandrels

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Long Line Forms

• Typical long line
• Continuous prestressing strand for multiple
  pieces
• Depress depth to increase capacity
• Stressing method
• Single stressing
• Gang stressing

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Long Line Forms

• Cost benefit due to
• Efficient forming
• Repetitive use
• Reusable bulkheads
• Mass production

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Single form

• Good choice for complex pieces
• Molds can be modified for similar pieces

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Single form

• Mold Modifications
• Easily modified
• Embedded items
• Reveals
• Blockouts

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Removal of Blocking Material
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Sawcut pieces

• Hollow Core
• Cast as continuous piece,
• Cut to fit application
• Cost benefit
• Repetitive design
• No need for bulkheads
• Efficient manufacturing
• Limited embed materials

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Architectural Features

• Textures
• Ribs
• Fractured Fin
• Acid Etch
• Sand Blast
• Retarded
• Inlay Brick
• Inlay Stone
• Mimic Inlay Stone
• Inlay Granite

• Color
• Based on Aggregate
• Tint
• Combination
• Texture
• Color and Texture combined

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Architectural Features

• Geometry
• Liners
• Bullnose
• Reveal
• Quirk Miter
• Mixed finishes

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Finish Exposed aggregate

• Process
• Paint retarder on form surface
• Cast product
• Cure Product
• Remove and high pressure wash
• Texture controlled by depth of exposure or cure
  prevention

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Finish Acid etching

• Process
• High pressure acid solution
• Sandblasting creates similar results
• Texture controlled by depth of etching

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Finish Sand Blasting

• Process
• High pressure sand or metal shot
• Texture controlled by depth of blasting

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Inlay items

• Brick
• Metal
• Stone

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Backup Mix

• Used to reduce cost
• Used when back side is unexposed to public view.

Backup Mix
Architectural Face Mix
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Engineering Features

• Cantilevers
• Open Space
• Transfer Members

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Connections

• Monolithic Emulation
• Mimic cast in place structures
• Used in high seismic risk zones
• Wet joint construction
• Precast as formwork

• Welded
• Mimic jointed structures
• Low to moderate seismic risk
• Quick building completion

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Haunches

• Steel sections
• Reinforced concrete haunches

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Panel to Panel

• Designed to resist shear

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Panel to Panel

• Designed to resist tension

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Precast to Foundation

• Precast connections can be customized for unique
  configurations

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Building Erection

• Transportation
• Bracing
• Rigging
• Piece Erection

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Questions?