INFRASTRUCTURE&
UNBONDED POST-TENSIONING
(CASE STUDIES)
Neel Khosa
AMSYSCO, Inc.
2013 PTI Convention
2
OUTLINE
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Concrete Pavements vs. Asphalt Pavements
Applications for Unbonded Post-Tensioned Concrete
Case Studies with Unbonded Post-Tensioned Concrete
ASPHALT
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Cheaper Initial Construction Cost
Faster Construction Schedule
“Softer” for Pedestrian Traffic
Better Traction for Vehicles
CONCRETE
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Durability / Less Maintenance
Lower Life-Cycle Costs in High Traffic Roads
Light Color (Heat Island)
Not Oil-Dependent (Environment)
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CONCRETE VS. ASPHALT ROAD
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CONCRETE ACTS MORE LIKE A BRIDGE OVER THE SUBGRADE.
LESS PRESSURE IS PLACED ON MATERIALS BELOW CONCRETE PAVEMENTS THAN ON ASPHALT PAVEMENTS.
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“Concrete pavements on average outlast asphalt pavements by 10-15 years before needing rehabilitation.”
American Concrete Pavement Association
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NOISE VS. FUEL ECONOMY
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Decibel Max Decibel Min Inst. Fuel Economy
(mpg)
0
20
40
60
80
100
120
AsphaltConcrete
Source: http://www.youtube.com/watch?v=ryGugNQbOL0
APPLICATIONS FOR UNBONDED POST-TENSIONED CONCRETE
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AIRPORT RUNWAYS
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PARKING LOTS
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PEDESTRIAN BRIDGES
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ROADS, ROADS, ROADS
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CASE STUDIES WITH UNBONDED POST-TENSIONED CONCRETE
Wayzata Bay Roads
Buford Avenue Reconstruction
Emergency Vehicle Operator
Course
Univ. of MN STSS Pedestrian
Bridge
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Wayzata Bay Roads
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Excessive Settlement due to soil
PT Slab supported by 120’ piles
Designed for HS20-44 Loading
Encapsulated Post-Tensioning
Wayzata Bay Roads
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Section thru PT Slab
Wayzata Bay Roads
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Site Prep Membrane
Wayzata Bay Roads
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PT Install Pour
Wayzata Bay Roads
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Curing Open for Use!
Wayzata Bay Roads
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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)
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SLAB-ON-GROUND2013 Award of Excellence
Emergency Vehicle Operator Course (EVOC)
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60,000 square foot area
2 pours on consecutive days
0.5” Encapsulated Post-Tension
Made slippery for driver testing
EVOC
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Purpose of EVOC?
EVOC
Police, Fire, Military Vehicle Training
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Post-Tensioning Layout
EVOC
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1st Pour 2nd Pour
EVOC
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2nd Pour Finishing
EVOC
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Buford Ave. Reconstruction
29Buford Ave.
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PT Section = 102 Feet x 32 Feet
7” Concrete Thickness
40 Years of Expected Life
0.6” PT replaced RC Pavement
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PT CONCRETE
ASPHALTBuford Ave.
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Bus Traffic
Buford Ave.
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Hint: It involves the University of Minnesota.
Buford Ave.
What’s under the road ???
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Buford Ave.
Underground Student Lounge
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Buford Ave.
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Univ. of MN STSSPlaza and Pedestrian Bridge
36STSS Pedestrian
Bridge
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STSS Building is post-tensioned
Bridge = 220’ long x 20’ wide
6” slab with 1 longitudinal beam
Traffic = 25,000 students/day
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STSS Plaza/Ped
BRIDGE
PLAZA
STSS BUILDING
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STSS Plaza
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STSS Plaza
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STSS Pedestrian Bridge
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STSS Pedestrian Bridge
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Under the Bridge
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Unbonded Encapsulated Post-Tensioning is an effective alternative to RC or Asphalt for infrastructure projects.
RECAP
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SOURCESPHOTOGRAPHS
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
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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%20Choice.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