Infrastructure and Unbonded Post Tensioning
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The document discusses the use of unbonded post-tensioning for infrastructure projects. It begins with an overview of concrete versus asphalt pavements. Unbonded post-tensioning can be used for applications like airport runways, parking lots, and pedestrian bridges. The document then presents three case studies where unbonded post-tensioning was used: a road project in Wayzata Bay with poor soil conditions, an emergency vehicle operator course, and a reconstruction project on Buford Avenue. It concludes that unbonded encapsulated post-tensioning is an effective alternative to reinforced concrete or asphalt for infrastructure projects.
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Infrastructure and Unbonded Post Tensioning
- 1. INFRASTRUCTURE & UNBONDED POST-TENSIONING (CASE STUDIES) Neel Khosa AMSYSCO, Inc. 2013 PTI Convention
- 2. OUTLINE 2 Copyright © 2013 AMSYSCO Inc. Concrete Pavements vs. Asphalt Pavements Applications for Unbonded Post-Tensioned Concrete Case Studies with Unbonded Post-Tensioned Concrete
- 3. ASPHALT Copyright © 2013 AMSYSCO Inc.
- 4. 4 Copyright © 2013 AMSYSCO Inc. Cheaper Initial Construction Cost Faster Construction Schedule “Softer” for Pedestrian Traffic Better Traction for Vehicles
- 5. CONCRETE Copyright © 2013 AMSYSCO Inc.
- 6. 6 Copyright © 2013 AMSYSCO Inc. Durability / Less Maintenance Lower Life-Cycle Costs in High Traffic Roads Light Color (Heat Island) Not Oil-Dependent (Environment)
- 7. CONCRETE VS. ASPHALT ROAD 7 Copyright © 2013 AMSYSCO Inc. CONCRETE ACTS MORE LIKE A BRIDGE OVER THE SUBGRADE. LESS PRESSURE IS PLACED ON MATERIALS BELOW CONCRETE PAVEMENTS THAN ON ASPHALT PAVEMENTS.
- 8. 8 Copyright © 2013 AMSYSCO Inc. “Concrete pavements on average outlast asphalt pavements by 10-15 years before needing rehabilitation.” American Concrete Pavement Association
- 9. NOISE VS. FUEL ECONOMY 9 Copyright © 2013 AMSYSCO Inc. 0 20 40 60 80 100 120 Decibel Max Decibel Min Inst. Fuel Economy (mpg) Asphalt Concrete Source: http://www.youtube.com/watch?v=ryGugNQbOL0
- 10. APPLICATIONS FOR UNBONDED POST-TENSIONED CONCRETE Copyright © 2013 AMSYSCO Inc.
- 11. Copyright © 2013 AMSYSCO Inc.
- 12. Copyright © 2013 AMSYSCO Inc.
- 13. Copyright © 2013 AMSYSCO Inc.
- 14. 14 Copyright © 2013 AMSYSCO Inc. CASE STUDIES WITH UNBONDED POST-TENSIONED CONCRETE Wayzata Bay Roads Buford Avenue Reconstruction Emergency Vehicle Operator Course Univ. of MN STSS Pedestrian Bridge
- 15. 15 Copyright © 2013 AMSYSCO Inc. Wayzata Bay Roads
- 16. 16 Copyright © 2013 AMSYSCO Inc. Excessive Settlement due to soil PT Slab supported by 120’ piles Designed for HS20-44 Loading Encapsulated Post-Tensioning Wayzata Bay Roads
- 17. 17 Copyright © 2013 AMSYSCO Inc. Wayzata Bay Roads
- 18. 18 Copyright © 2013 AMSYSCO Inc. Wayzata Bay Roads
- 19. 19 Copyright © 2013 AMSYSCO Inc. Wayzata Bay Roads
- 20. 20 Copyright © 2013 AMSYSCO Inc. Wayzata Bay Roads
- 21. 21 Copyright © 2013 AMSYSCO Inc. Wayzata Bay Roads “Post-Tensioning was an effective way to reduce the concrete volume of the slab to 13 inches – which minimized the load to the supporting pipe piles.” Ryan Bonniwell (Ericksen Roed & Associates)
- 22. 22 Copyright © 2013 AMSYSCO Inc. Emergency Vehicle Operator Course (EVOC)
- 23. 23 Copyright © 2013 AMSYSCO Inc. 60,000 square foot area 2 pours on consecutive days 0.5” Encapsulated Post-Tension Made slippery for driver testing EVOC
- 24. 24 Copyright © 2013 AMSYSCO Inc. EVOC
- 25. 25 Copyright © 2013 AMSYSCO Inc. EVOC
- 26. 26 Copyright © 2013 AMSYSCO Inc. EVOC
- 27. 27 Copyright © 2013 AMSYSCO Inc. EVOC
- 28. Copyright © 2013 AMSYSCO Inc. Buford Ave. Reconstruction
- 29. Buford Ave. 29 Copyright © 2013 AMSYSCO Inc. PT Section = 102 Feet x 32 Feet 7” Concrete Thickness 40 Years of Expected Life 0.6” PT replaced RC Pavement
- 30. Copyright © 2013 AMSYSCO Inc. Buford Ave.
- 31. Copyright © 2013 AMSYSCO Inc. Buford Ave.
- 32. 32 Copyright © 2013 AMSYSCO Inc. Buford Ave.
- 33. Copyright © 2013 AMSYSCO Inc. Buford Ave.
- 34. 34 Copyright © 2013 AMSYSCO Inc. Buford Ave.
- 35. Copyright © 2013 AMSYSCO Inc. Univ. of MN STSS Plaza and Pedestrian Bridge
- 36. STSS Pedestrian Bridge 36 Copyright © 2013 AMSYSCO Inc. STSS Building is post-tensioned Bridge = 220’ long x 20’ wide 6” slab with 1 longitudinal beam Traffic = 25,000 students/day
- 37. Copyright © 2013 AMSYSCO Inc. STSS Plaza/Ped
- 38. Copyright © 2013 AMSYSCO Inc. STSS Plaza
- 39. Copyright © 2013 AMSYSCO Inc. STSS Plaza
- 40. Copyright © 2013 AMSYSCO Inc. STSS Pedestrian Bridge
- 41. Copyright © 2013 AMSYSCO Inc. STSS Pedestrian Bridge
- 42. Copyright © 2013 AMSYSCO Inc.
- 43. Copyright © 2013 AMSYSCO Inc. Unbonded Encapsulated Post-Tensioning is an effective alternative to RC or Asphalt for infrastructure projects. RECAP
- 44. SOURCES PHOTOGRAPHS Asphalt Road : http://www.llpelling.com Concrete Road : http://www.urbanophile.com Concrete vs. Asphalt : http://www.pavement.com Airport Runways : http://paulswork.wordpress.com Parking Lots : http://fatjacl.com Pedestrian Bridges : http://mid-citysteel.com Wayzata Bay Roads : Adolfson & Peterson Construction EVOC : Brainerd Dispatch and Pawan Gupta STSS Plaza : McGough Construction Question Mark : http://m.inmagine.com STRUCTURAL DRAWINGS Wayzata Bay Roads : Ericksen Roed EVOC : URS Buford Ave. : SEH 44 Copyright © 2013 AMSYSCO Inc. RELEVANT DATA http://www.concreteisbetter.com/elib-factsheets.html http://www.concreteisbetter.com/elib-casestudies.html http://www.concreteisbetter.com/elib-research.html http://www.concreteisbetter.com/vs.html http://www.ltrc.lsu.edu/ltc_11/pdf/The%20Use%20of%20Life%20Cycle%20Assessment%20(LCA)%20to%20Evaluate%20Pavement%20C hoice.pdf http://www.ctscement.com/Specs2005/PDFdocs/TypeK_News2003.pdf http://www.bolingconcrete.com/benefits-of-concrete.html http://www.thomasconcrete.com/UserDyn/ThomasConcrete/pdf/concrete-processes.pdf http://www.pavement.com/concrete_pavement/technical/fundamentals/Differences_Between_Concrete_and_Asphalt.asp http://www.cement.org/PCA%20White%20Paper%203.pdf http://www.artba.org/about/faqs-transportation-general-public/faqs/ http://www.dcnonl.com/article/id48193 http://www.pwmag.com/concrete/asphalt-vs--concrete--the-fight-to-pave-our-roads.aspx http://www.pwmag.com/concrete/asphalt-vs--concrete--the-fight-to-pave-our-roads_2.aspx
Editor's Notes
- Infrastructure is one area where Unbonded PT has the potential to increase its market share relative to existing industries.
- 94% of US road are paved in asphalt.
- Concrete makes up the remaining 6% of US roads and is most commonly used in bridges.
- One potential market where Unbonded Post-Tensioning can increase its market share is airport runways. Traditionally, these are RC pavement. The concrete thickness varies between 12" at non-hub airports to 18" at larger airports.Rockford, IL has a non-hub airport runway that has a 7" Post-Tensioned slab. The cost analysis in 2003 by Ed Rice showed that the PT runway cost $46/sqyd vs. $50/sq.yd for conventional RC. Another benefit was that PT helped eliminate control joints.
- Another potential market for Unbonded Post-Tensioning would be parking lots, especially those on expansive soils. According to the US Census Bureau, there were 105 million commercial parking spaces in the US. - majority of which are in parking lots.
- The US Highway Network has 4 million miles of roads - of which 47,000 miles are for heavy highway trafficaccording to the FHA.
- Emergency Vehicle Operator Course (aka EVOC) was a built recently in Camp Ripley Minnesota and won the 2013 PTI Award of Excellence in the SOG category.
- Encapsulated PT was used due to the corrosive environment.
- EVOC is a 4-mile course used by police, fire and military vehicles for training purposes. The Post-Tensioned portion is a skid pan which is made slippery with water, oils and other chemicals so that drivers can practice controlled skids in their vehicles.
- 2 PT tendons were placed 16" o.c. in the long direction and 19" o.c. in the short direction. A perimeter expansion joint was used to separate the PT slab from the asphalt pavement.
- 6000 psi shrinkage compensating concrete was laid on top of 2 layers of polyethylene sheet and a 14" base course. Initial stressing of the PT occurred at 16.5 kips when the 1st pour reached 3000 psi and final stressing occurred at 33 kips when the 2nd pour reached 3000 psi.
- Buford Ave. Pavement Reconstruction project involved replacing an existing RC pavement in St. Paul, MN with a Post-Tensioned Pavement.
- The construction was completed in 2 months and was designed for a 40 year life span.
- Buford is located at a major bus stop and was designed to handle heavy traffic from buses.
- The Univ. of MN Underground Student Lounge was operational during reconstruction. The Post-Tensioned pavement solved one major problem for the students in the U/G Lounge. It was chosen to reduce major deflections and vibrations from the bus traffic from above compared to the RC pavement.