superstructure replacement substructure repair rehabilitation of i-95 bridges 11 bridges along i-95...
TRANSCRIPT
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Superstructure
Replacement
Substructure
Repair
Rehabilitation of I-95 Bridges
11 Bridges Along I-95 Corridor 10
98
7
5
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6
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ROLLED BEAMS
Existing deck is 7-1/2” thickReplacement deck creates overstress in beamsCategory E fatigue detail at cover plate endsPaint is in poor condition and lead basedReplace steel beams
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Lombardy/CSX Bridge12’ Shoulders (8’-8” Widening
Each Side)
Robin Hood Rd. BridgeRamp Extension (14’-8”
Widening SBL)
Sherwood Ave. BridgeRamp Extension (14’-8”
Widening SBL)
Rehabilitation of I-95 Bridges
Bridge Widening
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Preconstructed Composite Units (PCU)
Rehabilitation of I-95 Bridges
Superstructure Replacement
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PCU’sChosen option uses Pre-Constructed Units
assembled in a casting yard, trucked to site and lifted into place by cranes
PCU Being Placed during early test day
PCU ready in Casting Yard
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Construction Sequence
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Construction Sequence
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Construction SequenceSetup of Maintenance of Traffic
Traffic Shifting
Traffic waiting to Shift
Moveable Traffic Barrier Setup
Initiating MOT
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Construction SequencePreparation for PCU
Repair Bearing Pads
Cut Deck and Diaphragms and remove Existing
Repaired Pier Cap
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Construction Sequence Preparation & Installation
Moving PCU to Pick up Point
Placement of PCU
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Construction Sequence Placing PCU
Aligning PCU & then Disconnecting
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Match-Cast Longitudinal Joint
Cast-in-Place Closure PourHighly Skew Bridges Lombardy / CSXRobin HoodHermitageWestwood
Rehabilitation of I-95 Bridges
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Surface Repairs at Abuts. & Piers
Pier Cap Replacement 5 Piers for Lombardy/CSX Bridge
Pier Cap Strengthening Infill Wall between Columns on Piers at Boulevard Bridge
Rehabilitation of I-95 Bridges
Substructure Repair
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Cathodic ProtectionChloride Extraction (ECE)Sealing Concrete SurfacesPier Caps
Rehabilitation of I-95 Bridges
Substructure Repair
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SCS’s Role in 11 Bridges
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Condition of StructureCondition of Structure
Co
st o
f M
ain
ten
ance
Co
st o
f M
ain
ten
ance
InternalDamage
First Visible Damage
Critical PointCritical PointDamage Accelerates
Potential Failure
Corrosion Cost Progression
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Temporary Piers
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Corrosion Damage
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Corrosion Damage
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How much delam/spall existed at the time?How much delam/spall existed at the time?
Chloride presence at various depths? Chloride presence at various depths?
Future penetration & effects of chlorides? Future penetration & effects of chlorides?
Active corrosion occurring? How quickly?Active corrosion occurring? How quickly?
Existing and future damage?Existing and future damage?
Presence and progression of ASR?Presence and progression of ASR?
High risk of prescribing a poor solution High risk of prescribing a poor solution withoutwithout proper diagnosis… proper diagnosis…
Evaluation
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Boulevard - Structure TotalChloride Concentration Histogram
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Line Scan 28Line
Scan 29
Abutment Wall
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GPR – Good Concrete
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GPR – Delam. Concrete
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Visible concrete damage – significant increaseVisible concrete damage – significant increaseDeveloped a concrete damage % for each Developed a concrete damage % for each elementelement
Average recorded cover – lowAverage recorded cover – low
Majority of potential readings – active corrosionMajority of potential readings – active corrosion
High chloride readings behind rebarsHigh chloride readings behind rebars
Near future concrete damage will resultNear future concrete damage will result
Significant weakening of the structure within Significant weakening of the structure within five years five years
Conclusions
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Based on a unique methodology, we developed Based on a unique methodology, we developed recommendations for repair / replace / recommendations for repair / replace /
life extensionlife extension
Concrete repair on all bridgesConcrete repair on all bridges
ECE to lower the chloride concentration on ECE to lower the chloride concentration on
certain bridgescertain bridges
Sacrificial CP on the rest of the bridges Sacrificial CP on the rest of the bridges
Sprayed Zinc – widely used, easy to applySprayed Zinc – widely used, easy to apply
Recommendations
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