Superstructure

Replacement

Substructure

Repair

Rehabilitation of I-95 Bridges

11 Bridges Along I-95 Corridor 10

98

7

5

1234

6

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

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

Preconstructed Composite Units (PCU)

Rehabilitation of I-95 Bridges

Superstructure Replacement

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

Construction Sequence

Construction Sequence

Construction SequenceSetup of Maintenance of Traffic

Traffic Shifting

Traffic waiting to Shift

Moveable Traffic Barrier Setup

Initiating MOT

Construction SequencePreparation for PCU

Repair Bearing Pads

Cut Deck and Diaphragms and remove Existing

Repaired Pier Cap

Construction Sequence Preparation & Installation

Moving PCU to Pick up Point

Placement of PCU

Construction Sequence Placing PCU

Aligning PCU & then Disconnecting

Match-Cast Longitudinal Joint

Cast-in-Place Closure PourHighly Skew Bridges Lombardy / CSXRobin HoodHermitageWestwood

Rehabilitation of I-95 Bridges

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

Cathodic ProtectionChloride Extraction (ECE)Sealing Concrete SurfacesPier Caps

Rehabilitation of I-95 Bridges

Substructure Repair

SCS’s Role in 11 Bridges

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

Temporary Piers

Corrosion Damage

Corrosion Damage

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

Boulevard - Structure TotalChloride Concentration Histogram

Line Scan 28Line

Scan 29

Abutment Wall

GPR – Good Concrete

GPR – Delam. Concrete

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

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