prestressing of carbon fiber elements in virginia
TRANSCRIPT
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Prestressing of Carbon Fiber Elements in Virginia Tuesday, August 11, 2015, 1:30 PM – 3:00 PM E. Alan Saunders, PE, CCM VDOT Assistant State Construction Engineer
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Corrosion Damaged Bridges
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One of the leading causes of bridge deterioration is corrosion of the steel.
In 2004, FHWA reported $10.5 billion in bridge rehabilitation
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Improvements at VDOT
VDOT has improved the corrosion resistance of steel reinforced bridge decks using CRR
Next comes improvements to prestressed elements.
Thousands of pounds of stainless CRR for placement in PCUs
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Carbon Fiber Composite Cable (CFCC) or Carbon Fiber
Reinforced Polymer (CFRP)
Directionally Strong Corrosion Free Lightweight
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CFCC Strand Spiral
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CFCC Properties
Property Value Tensile strength (min) 338 ksi Elastic Modulus 22,500 ksi Elongation at break 1.7% Specific gravity 1.6
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Maine Cable Stayed
Michigan Post Tensioned
CFCC Applications
More than 130 applications by 2009 Prestressed and Post-tensioning Suspension Bridge Main Cable Ground Anchor Stay Cable
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World’s First Bridge Using CFCC
Shinmiya Bridge Coastal Structure Replacement built in 1988 Underside now corrosion free
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Sea of Japan
Initial Bridge (20 yrs service)
Replacement (20 yrs service)
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Initial CFCC Pile Research Plan
18 piles would be fabricated using carbon fiber composite cable reinforcement in place of traditional steel strand and spiral
Each pile would have16 strands 0.6 in diameter CFCC
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VDOT’s First Application
VDOT Nimmo Parkway in Virginia Beach 9
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Pile Fabrication
Bayshore Concrete Products fabricated all the piles Two test piles would be
fabricated at facility in Cape Charles, VA
Remaining production piles would be fabricated at facility in Chesapeake, VA
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Overview of Casting Areas
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180-ft (Cape Charles) and 320-ft (Chesapeake) long beds with steam curing pipes at both plants
Production Piles
Test Piles
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The Coupler (AKA. Double Chuck)
Several parts required to properly assemble coupler
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Strand Coupled
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CFCC Details: No metal or sharp corners
Plastic Tie and Tubes Circular Spiral
Removable Lift Device
13 Truly Corrosion Free Piles
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Stressing
Stressed •5 kips •15 kips •25 kips •34 kips 14
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Concrete Placement and Consolidation
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Rubber tipped vibrator ends
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16 Couplers kept below 122 F
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Pile Removed From Forms
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Piles are Transported to Site
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Preparing Piles for Driving Piles are lifted and
positioned for driving
During Driving Ram Weight
• 10,141 lbs
Hammer Stroke • 5.7 – 9.2 ft
Test piles were instrumented
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CFCC Reinforced Piles Summary
Success in fabrication and driving 2 test piles fabricated In Nov 2012 and
driven in Oct 2013 (11-month cycle) 16 production piles fabricated in Nov
2013 and driven in Dec 2013 (1-month cycle)
Driving response similar to steel reinforced pile
Successful Pile Design 24 inch square pile, with 5.7- mm (0.225-
in) CFCC spiral in a circular pattern 16 15.2-mm (0.6-in) strand/pile at 34
kips/strand 20
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CFCC Reinforced Pile Parting Thoughts
Unlike steel strands Strand cost per foot
higher Preparing strands for
tensioning is slower No Buy America
requirement Corrosion free
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CFCC Beams
2 span bridge 4 beams per span 82-ft length beam
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Route 49 over Aaron’s Creek CFCC Beams
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Aaron’s Creek CFCC Beams
Each beam is a 45” modified bulb tee girders
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Preparing CFCC Strand
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CFCC Tensioned and Beam Forms Closed
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Concrete prepared and Tested
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Concrete Placed and Finished
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Beams are Transported to Site and Erected
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CFCC Pile and Beam Summary
Corrosion free piles can be produced and driven using standard practices and equipment
Corrosion free modified bulb tee beams can be produced and erected also using standard practices and equipment
For both CFCC piles and modified bulb tee beams, some design and materials of construction modifications are required
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Current Challenges Industry
More competitors Eliminating delays in
bid response Minimize shipping
issues Use of SCC mixes to
reduce need for vibrator
Research Temperature or
coupler slippage concern
Improvements to end preparation time
Maximizing material use to reduce cost
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DOTs Define where higher cost AND higher benefit materials could be of value to the DOT and public
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Prestressing of Carbon Fiber Elements in Virginia Questions: Celik Ozyildirim ([email protected]) Stephen Sharp ([email protected]) Acknowledgements: FHWA, VDOT Construction, VDOT Structure and Bridge, VDOT Materials Divisions, and Virginia Center for Transportation Innovation and Research