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2_Introduction_to_Precast.ppt
- 1. PCI 6th Edition Introduction to Precast
- 2. Presentation Outline • Material Applications • Benefits • Forming and Production Techniques • Architectural Possibilities • Engineering Applications • Connection Introduction • Building Construction
- 3. Precast and Prestress • Precast – Not cast in its final condition – Normally mild reinforcement
- 4. Precast and Prestress • Precast • Prestressed – Reinforced with strand – Strand is stressed prior to casting
- 5. Precast and Prestress • Precast • Prestressed • Post-tensioned – Strand is stressed after casting and curing
- 6. Applications • Buildings – Residential – Office buildings – Warehouses and industrial – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 7. Applications • Buildings – Residential – Office buildings – Warehouses and industrial – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 8. Applications • Buildings – Residential – Office buildings – Distribution Centers – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 9. Applications • Buildings – Residential – Office buildings – Warehouses and industrial – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 10. Applications • Buildings – Residential – Office buildings – Warehouses and industrial – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 11. Applications • Buildings – Residential – Office buildings – Warehouses and industrial – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 12. Applications • Buildings – Residential – Office buildings – Warehouses and industrial – Parking structures – Justice facilities – Stadiums, arenas – Bridges
- 13. Applications • Other: – WWT facilities – Airports – Marine – Cold Storage – Light poles – RR ties – Silos
- 14. 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
- 15. Forming Techniques • Variety of configurations • Vast flexibility • Creative structural and architectural advantages • Multiple colors
- 16. 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
- 17. Long Line Forms • Typical long line – Continuous prestressing strand for multiple pieces – Depress depth to increase capacity – Stressing method • Single stressing • Gang stressing
- 18. Long Line Forms • Cost benefit due to – Efficient forming – Repetitive use – Reusable bulkheads – Mass production
- 19. Single form • Good choice for complex pieces • Molds can be modified for similar pieces
- 20. Single form • Mold Modifications – Easily modified – Embedded items – Reveals – Blockouts
- 21. Removal of Blocking Material
- 22. 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
- 23. • 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 Architectural Features
- 24. Architectural Features • Geometry • Liners • Bullnose • Reveal • Quirk Miter • Mixed finishes
- 25. 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”
- 26. Finish – Acid etching • Process – High pressure acid solution – Sandblasting creates similar results • Texture controlled by depth of etching
- 27. Finish – Sand Blasting • Process – High pressure sand or metal shot • Texture controlled by depth of blasting
- 28. Inlay items • Brick • Metal • Stone
- 29. Backup Mix • Used to reduce cost • Used when back side is unexposed to public view. Architectural Face Mix Backup Mix
- 30. Engineering Features • Cantilevers • Open Space • Transfer Members
- 31. 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
- 32. Haunches • Steel sections • Reinforced concrete haunches
- 33. Panel to Panel • Designed to resist shear
- 34. Panel to Panel • Designed to resist tension
- 35. Precast to Foundation • Precast connections can be customized for unique configurations
- 36. Building Erection • Transportation • Bracing • Rigging • Piece Erection QuickTime™ and a Microsoft Video 1 decompressor are needed to see this picture.
- 37. Questions?